src/third_party/skia/tools/pathops_sorter.htm - cobalt - Git at Google

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 {{{187.410400390625, -343.557373046875}, {-752.7930908203125, 431.57177734375}, {387.663330078125, 701.281982421875}}},
 {{{187.410400390625, -343.557373046875}, {-86.16302490234375, -366.027099609375}, {-468.3883056640625, -25.736572265625}}}
 </div>

 <div id="quad0">
 {{{-708.0077926931004413, -154.6166947224404566}, {-701.0429781735874712, -128.8517387364408933}, {505.58447265625, -504.9130859375}}},
 {{{-708.0077926931004413, -154.6166947224404566}, {-721.5125661899801344, -174.4028951148648048}, {-32.39227294921875, -906.3277587890625}}}
 {{{-707.8363172079705237, -154.25350453766481}, {-708.0077926931004413, -154.6166947224404566}}}
 {{{-708.1792267111628689, -154.9799046892118213}, {-708.0077926931004413, -154.6166947224404566}}}
 </div>

 <div id="quad999">
 {{{-708.00779269310044, -154.61669472244046}, {-707.92342686353186, -154.30459999551294}, {505.58447265625, -504.9130859375}}},
 {{{-708.00779269310044, -154.61669472244046}, {-708.1713780141481, -154.85636789757655}, {-32.39227294921875, -906.3277587890625}}}
 {{{-708.0077672218041, -154.61664072892336}, {-708.00779269310044, -154.61669472244046}}}
 {{{-708.00781827681976, -154.61674895426012}, {-708.00779269310044, -154.61669472244046}}}
 </div>

 <div id="quad113">
 {{{425.018310546875, -866.61865234375}, {-918.76531982421875, 209.05322265625}, {964.34716796875, 199.52587890625}}},
 {{{425.018310546875, -866.61865234375}, {703.10693359375, -955.0738525390625}, {-952.24664306640625, -717.94775390625}}}
 </div>

 <div id="quad136">
 {{{178.1549072265625, 62.724609375}, {541.3643798828125, 223.823486328125}, {-446.77471923828125, -15.990478515625}}},
 {{{178.1549072265625, 62.724609375}, {-347.14031982421875, -834.27191162109375}, {-495.138885498046875, 96.476806640625}}}
 </div>

 <div id="quad206">
 {{{-503.007415771484375, -318.59490966796875}, {-798.330810546875, -881.21630859375}, {-127.2027587890625, 769.6160888671875}}},
 {{{-503.007415771484375, -318.59490966796875}, {-153.6217041015625, -776.896728515625}, {-378.43701171875, -296.3197021484375}}}
 {{{-468.9176053311167607, -89.39573455985038208}, {-503.007415771484375, -318.59490966796875}}}
 {{{-356.1573846604815685, -497.6768266540607328}, {-503.007415771484375, -318.59490966796875}}}
 {{{-559.0376987487186398, -420.2054253473417589}, {-503.007415771484375, -318.59490966796875}}}
 {{{-431.6586315464865606, -409.8353728177644371}, {-503.007415771484375, -318.59490966796875}}}
 </div>

 <div id="quad640">
 {{{412.260498046875, 49.193603515625}, {838.97900390625, 86.9951171875}, {427.7896728515625, -605.6881103515625}}},
 {{{412.260498046875, 49.193603515625}, {-995.54583740234375, 990.032470703125}, {-881.18670654296875, 461.211669921875}}}
 </div>

 <div id="quad3160">
 {{{426.645751953125, 813.79150390625}, {-387.23828125, -588.89483642578125}, {792.4261474609375, -704.4637451171875}}},
 {{{426.645751953125, 813.79150390625}, {19.24896240234375, -416.09906005859375}, {233.8497314453125, 350.778564453125}}}
 </div>

 <div id="quad35237">
 {{{-770.8492431640625, 948.2369384765625}, {-853.37066650390625, 972.0301513671875}, {-200.62042236328125, -26.7174072265625}}},
 {{{-770.8492431640625, 948.2369384765625}, {513.602783203125, 578.8681640625}, {960.641357421875, -813.69757080078125}}}
 </div>

 <div id="quad37226">
 {{{563.8267822265625, -107.4566650390625}, {-44.67724609375, -136.57452392578125}, {492.3856201171875, -268.79644775390625}}},
 {{{563.8267822265625, -107.4566650390625}, {708.049072265625, -100.77789306640625}, {-48.88226318359375, 967.9022216796875}}}
 </div>

 <div id="quad67242">
 {{{598.857421875, 846.345458984375}, {-644.095703125, -316.12921142578125}, {-97.64599609375, 20.6158447265625}}},
 {{{598.857421875, 846.345458984375}, {715.7142333984375, 955.3599853515625}, {-919.9478759765625, 691.611328125}}}
 </div>

 <div id="quad208">
 {{{481.1463623046875, -687.09613037109375}, {643.64697265625, -951.9462890625}, {162.5869140625, 698.7342529296875}}},
 {{{481.1463623046875, -687.09613037109375}, {171.8175048828125, -919.07977294921875}, {153.3433837890625, -587.43072509765625}}}
 </div>

 <div id="quad8a">
 {{{344.2755126953125, -689.900390625}, {743.6728515625, 512.8448486328125}, {928.598388671875, 111.946044921875}}},
 {{{344.2755126953125, -689.900390625}, {-950.03106689453125, -511.25741577148437}, {850.8173828125, 798.4874267578125}}}
 </div>

 <div id="quad8b">
 {{{344.2755126953125, -689.900390625}, {928.598388671875, 111.946044921875}, {743.6728515625, 512.8448486328125}}},
 {{{344.2755126953125, -689.900390625}, {-950.03106689453125, -511.25741577148437}, {850.8173828125, 798.4874267578125}}}
 </div>

 <div id="quad8741">
 {{{944.9024658203125, 939.454345703125}, {-971.06219482421875, -914.24395751953125}, {-878.764404296875, -297.61602783203125}}},
 {{{944.9024658203125, 939.454345703125}, {-838.96612548828125, -785.837646484375}, {-126.80029296875, 921.1981201171875}}}
 {{{107.03238931174118, 218.460612766889}, {944.9024658203125, 939.454345703125}}}
 {{{-292.72752350740279, 99.917575976335598}, {944.9024658203125, 939.454345703125}}}
 </div>

 <div id="quad89987">
 {{{939.4808349609375, 914.355224609375}, {-357.7921142578125, 590.842529296875}, {736.8936767578125, -350.717529296875}}},
 {{{939.4808349609375, 914.355224609375}, {-182.85418701171875, 634.4552001953125}, {-509.62615966796875, 576.1182861328125}}}
 </div>

 <div id="simplifyQuadratic36">
 {{{1.9474306106567383, 2.3777823448181152}, {1.9234547048814592, 2.2418855043499213}, {1.8885438442230225, 2.1114561557769775}}}
 {{{1.9474306106567383, 2.3777823448181152}, {2.0764266380046235, 2.2048800651418379}, {1.8888888359069824, 2.1111111640930176}}}
 </div>

 <div id="simplifyQuadratic58">
 {{326.236786,205.854996}, {329.104431,231.663818}, {351.512085,231.663818}}
 {{303.12088,141.299606}, {330.463562,217.659027}}
 </div>

 <div id="simplifyQuadratic58a">
 {{{326.23678588867188, 205.85499572753906}, {328.04376176056422, 222.11778818951981}, {337.6092529296875, 228.13298034667969}
 {{{303.12088012695312, 141.29960632324219}, {330.46356201171875, 217.65902709960937}
 </div>

 <div id="quadratic58again">
 {{322.935669,231.030273}, {312.832214,220.393295}, {312.832214,203.454178}}
 {{322.12738,233.397751}, {295.718353,159.505829}}
 </div>

 <div id="simplifyQuadratic56">
 {{{380.29449462890625, 140.44486999511719}, {387.29080200195312, 136.67460632324219}, {396.0399169921875, 136.67460632324219}}}
 {{{380.29449462890625, 140.44486999511719}, {388.29925537109375, 136.67460632324219}, {398.16494750976562, 136.67460632324219}}}
 {{{380.29449462890625, 140.44486999511719}, {387.692810, 137.858429}}}
 </div>

 <div id="simplifyQuadratic56a">
 {{{380.29449462890625, 140.44486999511719}, {387.29079954793264, 136.67460632324219}, {396.0399169921875, 136.67460632324219}}}
 {{{380.29449462890625, 140.44486999511719}, {388.29925767018653, 136.67460632324219}, {398.16494750976562, 136.67460632324219}}}
 {{fX=380.29449462890625 fY=140.44486999511719 }, {fX=398.16494750976562 fY=136.67460632324219 }} }
 {{fX=380.29449462890625 fY=140.44486999511719 }, {fX=396.03991699218750 fY=136.67460632324219 }}
 </div>

 <div id="simplifyQuadratic27">
 {{{1, 1}, {1, 0.666666687f}, {0.888888896f, 0.444444448f}}}
 {{{1, 1}, {1, 0.5f}, {0, 0}}}
 {{fX=1.0000000000000000 fY=1.0000000000000000 }, {fX=0.00000000000000000 fY=0.00000000000000000 }} }
 {{fX=1.0000000000000000 fY=1.0000000000000000 }, {fX=0.88888889551162720 fY=0.44444444775581360 }} }
 </div>

 <div id="cubicOp7d">
 {{{0.7114982008934021, 1.6617077589035034}, {0.51239079236984253, 1.4952657222747803}, {0.27760171890258789, 1.2776017189025879}, {0, 1}}}
 {{{0.7114982008934021, 1.6617077589035034}, {0.20600014925003052, 1.7854888439178467}, {9.8686491813063348e-017, 1.9077447652816772}, {0, 1}}}
 </div>

 <div id="cubicOp25i">
 {{{3.3856770992279053, 1.6298094987869263}, {3.777235186270762, 1.2744716237277114}, {3.7191683314895783, 1.4127666421509713}, {3.3995792865753174, 1.6371387243270874}}}
 {{{3.3856770992279053, 1.6298094987869263}, {3.3902986605112582, 1.6322361865810757}, {3.3949326825525121, 1.6346792563210237}, {3.3995792865753174, 1.6371387243270874}}}
 {{3.3856770992279053, 1.6298094987869263 }, {3.3995792865753174, 1.6371387243270874 }}
 </div>

 <div id="eldorado1">
 {{{1006.69513f, 291}, {1023.26367f, 291}, {1033.84021f, 304.431458f}, {1030.31836f, 321}}}
 {{{1030.318359375, 321}, {1036.695068359375, 291}}}
 {{fX=1030.3183593750000 fY=321.00000000000000 }, {fX=1006.6951293945312 fY=291.00000000000000 }} }
 </div>

 <div id="carpetplanet1">
 {{fX=67.000000000000000, 913.00000000000000 }, {194.00000000000000, 1041.0000000000000 }} }
 {{fX=67.000000000000000, 913.00000000000000 }, {67.662002563476562, 926.00000000000000 }} }
 {{{67, 913}, {67, 917.388977f}, {67.223999f, 921.726013f}, {67.6620026f, 926}}}
 {{{67, 913}, {67, 983.692017f}, {123.860001f, 1041}, {194, 1041}}}
 {{{67, 913}, {67.17070902440698, 919.69443917507760}}}
 </div>

 <div id="cubicOp104">
 {{{2.25, 2.5}, {4.5, 1}}}
 {{{2.25, 2.5}, {3.0833333333333321, 1.9999999999999973}, {4.0277778307596899, 1.2777777777777759}, {4.8611111640930176, 1}}}
 {{{2.25, 2.5}, {1.9476099234472042, 2.6814340459316774}, {1.6598502000264239, 2.8336073904096661}, {1.3973386287689209, 2.9246666431427002}}}
 {{{2.25, 2.5}, {1.2674896717071533, 3.1550068855285645}}}
 </div>

 <div id="cubicOp105">
 {{{2.4060275554656982, 3.4971563816070557}, {2.9702522134213849, 4.2195279679982622}, {3.8172613958721247, 5.0538091166976979}, {5, 6}}}
 {{{2.4060275554656982, 3.4971563816070557}, {3.4194286958002023, 3.5574883660881684}, {4.0077197935900575, 2.6628073781813661}, {2.2602717876434326, 0.33545622229576111}}}
 </div>

 <div id="cubicOp106">
 {{{0.80825299024581909, 1.9691258668899536}, {0.8601454496383667, 1.9885541200637817}, {0.92434978485107422, 2}, {1, 2}}}
 {{{0.80825299024581909, 1.9691258668899536}, {2.2400102615356445, 3.5966837406158447}, {2.5486805438995361, 3.362929105758667}, {2.494147777557373, 2.5976591110229492}}}
 {{{0.80825299024581909, 1.9691258668899536}, {2.494147777557373, 2.5976591110229492}}}
 {{{0.80825299024581909, 1.9691258668899536}, {1, 2}}}
 </div>

 <div id="cubicOp109">
 {{{5, 4}, {5.443139240552143931, 3.556860759447856069}, {5.297161243696338673, 3.702838775882067335}, {4.649086475372314453, 3.654751062393188477}}}
 {{{5, 4}, {4.876459521889748849, 3.876459521889748849}, {4.759596556247283949, 3.761504502886134915}, {4.649086475372314453, 3.654751062393188477}}}
 </div>

 <div id="skpwww_joomla_org_23">
 {{{421, 378}, {421, 380.209137f}, {418.761414f, 382}, {416, 382}}}
 {{{320, 378}, {421, 378.000031f}}}
 {{{421, 378.000031f}, {421, 383}}}
 {{{416, 383}, {418.761414f, 383}, {421, 380.761414f}, {421, 378}}}
 </div>

 <div id="xop1i">
 {{5.000,1.000}, {5.191,0.809}, {5.163,0.837}, {4.993,1.000}}
 {{5.000,1.000}, {4.968,1.024}}
 {{5.000,1.000}, {4.998,1.000}, {4.995,1.000}, {4.993,1.000}}
 </div>

 <div id="xop1u">
 {{3.500,3.500}, {3.000,4.000}, {2.500,4.500}, {1.000,4.000}}
 {{3.500,3.500}, {3.113,3.887}, {2.725,4.275}, {2.338,3.732}}
 </div>

 <div id="xOp2i">
 {{{2, 3}, {1.3475509011665685, 4.9573472965002949}, {2.8235509286078759, 3.5091759365574173}, {3.6505906581878662, 1.9883773326873779}}}
 {{{2, 3}, {2.4604574005585795, 2.654656949581065}, {3.0269255632437986, 2.3093137214344743}, {3.6505906581878662, 1.9883773326873779}}}
 {{{2, 3}, {1.0000000000000013, 3.7500000000000004}, {0.500000000000001, 4.5}, {1, 5}}}
 </div>

 <div id="testQuadratic56">
 {{{380.29449462890625, 140.44486999511719}, {379.59701460635523, 140.8207374882179}, {378.91729736328125, 141.23385620117187}}}
 {{{380.29449462890625, 140.44486999511719}, {387.29079954793264, 136.67460632324219}, {396.0399169921875, 136.67460632324219}}}
 {{{380.29449462890625, 140.44486999511719}, {388.29925767018653, 136.67460632324219}, {398.16494750976562, 136.67460632324219}}}
 </div>

 <div id="testQuad15">
 {{{1, 3}, {1, 1}}}
 {{{1, 3}, {0, 0}}}
 {{{1, 3}, {2, 0}, {0, 0}}}
 </div>

 <div id="testQuad21">
 {{{0, 0}, {1, 1}}}
 {{{0, 0}, {3, 0}, {2, 3}}}
 {{{0, 0}, {2, 3}}}
 {{{0, 0}, {2, 1}}}
 </div>

 <div id="testQuad22">
 {{{0, 0}, {1.2000000476837158, 0.80000001192092896}}}
 {{{0, 0}, {2, 0}}}
 {{{0, 0}, {0, 1}, {3, 2}}}
 {{{0, 0}, {1, 1}}}
 </div>

 <div id="testQuad23">
 {{{1, 3}, {1.9090908914804459, 1.1818182170391081}, {0.33884298801422119, 1.0165289640426636}}}
 {{{1, 3}, {0.33884298801422119, 1.0165289640426636}}}
 {{{1, 3}, {3, 0}}}
 </div>

 <div id="cubicOp35d">
 {{{2.211416482925415, 1.6971458196640015}, {1.2938009262874868, 2.8273619288830005}, {0.64690048634813535, 3.5876019453925414}, {0, 1}}}
 {{{2.211416482925415, 1.6971458196640015}, {1.0082962512969971, 1.997925877571106}}}
 {{{2.211416482925415, 1.6971458196640015}, {5, 1}}}
 </div>

 <div id="skpnational_com_au81">
 {{{1110.7071533203125, 817.29290771484375}, {1110.9998779296875, 817.58587646484375}, {1111, 818}}}
 {{{1110.7071533203125, 817.29290771484375}, {1110.526180767307778, 817.1119214508684081}, {1110.276144384999725, 817}, {1110, 817}}}
 {{{1110.7071533203125, 817.29290771484375}, {1110.888097894721341, 817.4738660071997174}, {1111, 817.7238677851287321}, {1111, 818}}}
 {{{1110.7071533203125, 817.29290771484375}, {1110.4140625, 817.0001220703125}, {1110, 817}}}
 </div>

 <div id="cubicOp85d">
 {{{1.0648664236068726, 2.9606373310089111}, {0.80208036362614099, 2.7936484180272374}, {0.49170560730211144, 2.2292640182552783}, {0, 1}}}
 {{{1.0648664236068726, 2.9606373310089111}, {0.6261905430171294, 3.2248910899179175}, {0.38860045191888659, 2.9430022595944321}, {0, 1}}}
 {{{1.0648664236068726, 2.9606373310089111}, {1.4282355765013004, 3.191542348791669}, {1.7006143409852195, 2.6626209548338378}, {2.2355968952178955, 2.0810616016387939}}}
 {{{1.0648664236068726, 2.9606373310089111}, {1.3437142856601656, 2.7926622975690494}, {1.7038131304059798, 2.4040122748806132}, {2.2355968952178955, 2.0810616016387939}}}
 </div>

 <div id="testQuads22">
 {{{0, 0}, {1.20000004768371582, 0.8000000119209289551}}}
 {{{0, 0}, {2, 0}}}
 {{{0, 0}, {0, 1}, {3, 2}}}
 {{{0, 0}, {1, 1}}}
 </div>

 <div id="cubicOp59d">
 {{{4, 1}, {4, 0.37698365082686142}, {4.3881493046286568, 2.4710128800004547}, {3.4716842174530029, 2.9292664527893066}}}
 {{{4, 1}, {0, 1}}}
 </div>

 <div id="findFirst1">
 {{{2.5767931938171387, 0.88524383306503296}, {2.4235948002142855, 0.88692501490384834}, {2.2328897699358898, 0.92237007668803672}, {2, 1}}}
 {{{2.5767931938171387, 0.88524383306503296}, {1.6008643534817426, 1.1609015907463158}, {1.1200849961943122, 1.8138386966264941}, {0.75343161821365356, 2.7170474529266357}}}
 {{{2.5767931938171387, 0.88524383306503296}, {4.0492746201577932, 0.86908498848619054}, {2.0567957107800288, 3.9721309710522448}, {0.75343161821365356, 2.7170474529266357}}}
 {{{2.5767931938171387, 0.88524383306503296}, {3.3470152174198557, 0.66768936887879282}, {4.4256496583071421, 0.68512993166142844}, {6, 1}}}
 {{{2.57679319, 0.885243833}, {5.15358639, 0.885243833}}}
 </div>

 <div id="testQuads54">
 {{1.000,1.000}, {1.500,0.500}, {1.500,0.250}}
 {{1.000,1.000}, {1.667,0.333}}
 {{1.000,1.000}, {2.000,3.000}}
 </div>

 <div id="testQuads45">
 {{{3, 3}, {3, 2.7999999523162842}, {2.880000114440918, 2.6400001049041748}}}
 {{{3, 3}, {3, 2}, {2, 0}}}
 {{{3, 3}, {2, 0}}}
 {{{3, 3}, {2.880000114440918, 2.6400001049041748}}}
 </div>

 <div id="testQuads59">
 {{{3, 1}, {3, 0}}}
 {{{3, 1}, {2.6666667461395264, 0.66666668653488159}}}
 {{{3, 1}, {2.8000003099441542, 1.1999996900558463}, {2.6800000667572021, 1.3600000143051147}}}
 {{{3, 1}, {2.6666667461395264, 1.3333333730697632}}}
 </div>

 <div id="skpcarrot_is24">
 {{{1020.08099, 672.161987}, {1020.08051, 651.450988}, {1011.68576, 632.700988}, {998.113511, 619.128738}}}
 {{{1020.08099, 672.161987}, {1019.27607, 640.291301}, {998.113511, 619.128738}}}
 {{{1020, 672}, {1020, 651.289307}, {1012.67767, 633.611633}, {998.03302, 618.96698}}}
 {{{1020, 672}, {1020, 640.93396}, {998.03302, 618.96698}}}
 </div>

 <div id="skpcarrot_is24a">
 {{{1020, 672}, {1020, 651.289307}, {1012.67767, 633.611633}, {998.03302, 618.96698}}}
 {{{1020, 672}, {1020, 640.93396}, {998.03302, 618.96698}}}
 </div>

 <div id="skpcarrot_is24b">
 {{{1020.08099, 672.161987}, {1020.08051, 651.450988}, {1011.68576, 632.700988}, {998.113511, 619.128738}}}
 {{{1020.08099, 672.161987}, {1019.27607, 640.291301}, {998.113511, 619.128738}}}
 </div>

 <div id="skpcarrot_is24c">
 {{{{1020.08099,672.161987}, {1020.08002,630.73999}, {986.502014,597.161987}, {945.080994,597.161987}}},
 {{{1020,672}, {1020,640.93396}, {998.03302,618.96698}}},
 </div>

 <div id="skpcarrot_is24d">
 {{{1020.08099, 672.161987}, {1019.27607, 640.291301}, {998.113511, 619.128738}}}
 {{{1020, 672}, {1020, 640.93396}, {998.03302, 618.96698}}}
 </div>

 <div id="skpcarrot_is24e">
 {{{{1020.08099,672.161987}, {1020.08002,630.73999}, {986.502014,597.161987}, {945.080994,597.161987}}},
 {{{1020.08099, 672.161987}, {1019.27607, 640.291301}, {998.113511, 619.128738}}}
 {{{1020, 672}, {1020, 640.93396}, {998.03302, 618.96698}}}
 </div>

 <div id="slop1">
 {{{-378.22698974609375, -987.8935546875}, {-47.53326416015625, 482.7139892578125}, {-626.4708251953125, -338.62969970703125}, {-847.94854736328125, -861.42230224609375}}}
 {{{-378.61790442466736, -987.49146723747253}, {-282.51787429804051, -556.39065286764685}, {-278.55106873374694, -364.17984985308294}}}
 {{{-305.5273847156202, -615.99979442705023}, {-305.04071954345704, -612.87932617187505}}}
 </div>

 qT=0.98917687 cT=0.788725084 dist=312.188493 cross=-40759.4852
 <div id="slop2">
 {{{79.5137939,-249.867188}, {260.778931,-561.349854}, {343.375977,-472.657898}, {610.251465,97.8208008}}}
 {{{312.993284,-406.178762}, {418.053808,-326.9483}, {610.036929,97.2408578}}}
 {{{463.107827,-200.015424}, {602.008878,79.5702581}}}
 </div>

 qT=0.0192863061 cT=0.241285225 dist=652.007881 cross=528435.665
 <div id="slop3">
 {{{-895.015015,-523.545288}, {223.166992,-999.644531}, {615.428711,-767.162109}, {605.479736,480.355713}}}
 {{{-894.932414,-523.605499}, {-66.4040558,-889.938889}, {278.515212,-667.684158}}}
 {{{-207.851881,-740.109296}, {-831.819002,-550.955104}}}
 </div>

 qT=0.0245724525 cT=0.231316637 dist=407.103004 cross=-46286.5686
 <div id="slop4">
 {{{876.492798,-849.716187}, {519.430908,-288.374207}, {187.2771,314.324341}, {335.363403,533.086548}}}
 {{{876.323133,-849.535824}, {594.868958,-415.229224}, {416.667192,-30.0277669}}}
 {{{638.343827,-458.798274}, {849.023879,-807.14691}}}
 </div>

 qT=0.000316393778 cT=0.248252634 dist=489.678412 cross=-57352.7653
 <div id="slop5">
 {{{876.492798,-849.716187}, {519.430908,-288.374207}, {187.2771,314.324341}, {335.363403,533.086548}}}
 {{{876.147506,-849.184429}, {593.963775,-414.437342}, {416.842819,-30.3791618}}}
 {{{622.139843,-430.512844}, {876.135915,-849.166571}}}
 </div>

 qT=0.989562776 cT=0.760518485 dist=211.50589 cross=134901.42
 <div id="slop6">
 {{{876.492798,-849.716187}, {519.430908,-288.374207}, {187.2771,314.324341}, {335.363403,533.086548}}}
 {{{416.141554,-30.4534414}, {237.846068,356.664216}, {335.719378,533.692585}}}
 {{{305.345404,315.701195}, {331.440368,525.591152}}}
 </div>

 qT=0.0978245708 cT=0.397465904 dist=959.737748 cross=158093.403
 <div id="slop7">
 {{{895.800171,-222.213013}, {-528.78833,526.47644}, {-967.299927,776.05603}, {-611.228027,319.934814}}}
 {{{629.666617,-82.159942}, {-661.943328,620.81113}, {-723.44072,537.121833}}}
 {{{-347.560585,421.003177}, {507.062151,-15.707855}}}
 </div>

 qT=0.169803964 cT=0.389326872 dist=658.039939 cross=107865.424
 <div id="slop8">
 {{{895.800171,-222.213013}, {-528.78833,526.47644}, {-967.299927,776.05603}, {-611.228027,319.934814}}}
 {{{629.536617,-81.7990275}, {-662.457623,620.485316}, {-723.31072,536.760918}}}
 {{{-330.996421,413.091598}, {257.080063,117.824582}}}
 </div>

 qT=0.0863836955 cT=0.387901231 dist=986.24777 cross=157348.113
 <div id="slop9">
 {{{895.800171,-222.213013}, {-528.78833,526.47644}, {-967.299927,776.05603}, {-611.228027,319.934814}}}
 {{{629.248316,-81.8984216}, {-662.339696,620.351182}, {-723.022419,536.860313}}}
 {{{-328.058099,411.68229}, {549.399512,-38.5985162}}}
 </div>

 qT=0.175359403 cT=0.390420692 dist=640.051938 cross=105488.084
 <div id="slop10">
 {{{895.800171,-222.213013}, {-528.78833,526.47644}, {-967.299927,776.05603}, {-611.228027,319.934814}}}
 {{{629.760605,-81.9577046}, {-661.301606,620.029216}, {-723.534707,536.919596}}}
 {{{-333.243516,414.168229}, {238.961251,127.37878}}}
 </div>

 qT=0.0986412358 cT=0.382365595 dist=921.951857 cross=145651.761
 <div id="slop11">
 {{{895.800171,-222.213013}, {-528.78833,526.47644}, {-967.299927,776.05603}, {-611.228027,319.934814}}}
 {{{629.919588,-82.1841825}, {-662.488256,620.04494}, {-723.693691,537.146073}}}
 {{{-316.541641,406.142013}, {504.067361,-14.0913644}}}
 </div>

 qT=0.146746849 cT=0.391456086 dist=750.006927 cross=123679.094
 <div id="slop12">
 {{{895.800171,-222.213013}, {-528.78833,526.47644}, {-967.299927,776.05603}, {-611.228027,319.934814}}}
 {{{629.712675,-82.0366321}, {-661.487948,620.191832}, {-723.486777,536.998523}}}
 {{{-335.364605,415.183549}, {334.079508,77.0194322}}}
 </div>

 qT=0.00196158131 cT=0.20357489 dist=466.080185 cross=241741.95
 <div id="slop13">
 {{{-627.671509,-359.277039}, {222.414551,-791.598328}, {390.603027,-581.903687}, {-21.7962036,560.33728}}}
 {{{-627.675958,-359.282959}, {-52.012535,-659.029798}, {116.967835,-524.756101}}}
 {{{-192.427848,-541.033993}, {-622.696937,-361.871356}}}
 </div>

 qT=0.948725598 cT=0.744200608 dist=699.694313 cross=179509.878
 <div id="slop14">
 {{{-362.331848,427.292603}, {634.418701,-661.946533}, {438.438599,-626.147278}, {-893.060425,214.243408}}}
 {{{259.978301,-393.549091}, {181.692599,-474.452437}, {-892.389834,213.689096}}}
 {{{-95.1310032,-267.365579}, {-696.89984,89.6307768}}}
 </div>

 qT=0.971677129 cT=0.755306143 dist=771.998962 cross=189468.817
 <div id="slop15">
 {{{-362.331848,427.292603}, {634.418701,-661.946533}, {438.438599,-626.147278}, {-893.060425,214.243408}}}
 {{{259.662278,-393.355886}, {181.612843,-473.935297}, {-892.073812,213.495892}}}
 {{{-120.438346,-253.451518}, {-782.461182,143.673352}}}
 </div>

 qT=0.571797795 cT=0.773951562 dist=495.560209 cross=221091.889
 <div id="slop16">
 {{{447.192383,-883.210205}, {359.794678,-987.765808}, {755.427612,-754.328735}, {963.672119,746.545776}}}
 {{{635.795655,-580.726915}, {810.704547,-228.491534}, {963.345162,745.921688}}}
 {{{801.470356,-87.7105789}, {646.551495,-558.433498}}}
 </div>

 qT=0.579236693 cT=0.782683167 dist=281.750564 cross=65125.1655
 <div id="slop17">
 {{{-931.259155,-883.589966}, {-485.682007,-615.793701}, {-68.5913696,-928.695923}, {431.499268,-810.584778}}}
 {{{-177.087049,-804.265618}, {110.452267,-866.525236}, {430.718323,-810.414444}}}
 {{{116.080189,-836.904702}, {-164.080748,-807.017753}}}
 </div>

 qT=0.0102075348 cT=0.2448024 dist=855.408492 cross=463614.179
 <div id="slop18">
 {{{-867.011292,844.139282}, {-136.156799,-281.244263}, {583.27771,-926.761414}, {998.710205,6.19244385}}}
 {{{-866.7221,843.65105}, {-308.756317,-34.8353977}, {183.843514,-346.222431}}}
 {{{-336.612013,120.039627}, {-844.283739,808.5112}}}
 </div>

 qT=0.473968306 cT=0.266805943 dist=567.851844 cross=-461509.104
 <div id="slop19">
 {{{-867.011292,844.139282}, {-136.156799,-281.244263}, {583.27771,-926.761414}, {998.710205,6.19244385}}}
 {{{-867.218781,844.133445}, {-310.496711,-35.0458119}, {184.340195,-346.704825}}}
 {{{-290.018097,66.7065093}, {132.536746,-312.639141}}}
 </div>

 qT=0.0232589401 cT=0.241085469 dist=789.989464 cross=428119.544
 <div id="slop20">
 {{{-867.011292,844.139282}, {-136.156799,-281.244263}, {583.27771,-926.761414}, {998.710205,6.19244385}}}
 {{{-866.942271,843.928587}, {-309.178151,-34.0018497}, {184.063685,-346.499968}}}
 {{{-344.507162,129.265381}, {-815.30119,763.644082}}}
 </div>

 <div id="skpnamecheap_405">
 {{{141.008835f, 837.9646f}, {141.235291f, 1109.05884f}}}
 {{{141, 842}, {141.14502f, 1000}}}
 {{{141.14502f, 1000}, {140, 1000}}}
 </div>

 <div id="skpwww_dealnews_com_315">
 {{{969.87066650390625, 4279.810546875}, {967.7166748046875, 4260}}}
 {{{969.87066650390625, 4279.810546875}, {969.866972698829386, 4279.809233889284769}, {969.88751220703125, 4279.81640625}}}
 {{{969.87066650390625, 4279.810546875}, {970, 4281}}}
 {{{969.87066650390625, 4279.810546875}, {968.9217161046863112, 4279.473236623693992}, {968.17156982421875, 4278.53564453125}}}
 {{{969.8706626470486754, 4279.810469740555163}, {969.8790796016525064, 4279.813461598796493}, {969.88751220703125, 4279.81640625}}}
 </div>

 <div id="skpwww_dealnews_com_315_a">
 {{{969.8706626470486754, 4279.810469740555163}, {969.8790796016525064, 4279.813461598796493}, {969.88751220703125, 4279.81640625}}}
 {{{969.87066650390625, 4279.810546875}, {969.8790834585100811, 4279.81353873324133}}}
 {{{969.88751220703125, 4279.81640625}, {969.8790796016525064, 4279.813461598796493}}}
 </div>

 <div id="testQuads60">
 {{{2, 2}, {1.977731304590550021, 1.97773134708404541}, {1.95645439624786377, 1.95546269416809082}}}
 {{{2, 2}, {2, 3}}}
 {{{2, 2}, {2, 1.960000038146972656}}}
 {{{2, 2}, {1.955341815948486328, 1.955341815948486328}}}
 </div>

 <div id="testQuads60_a">
 {{{2, 0}, {1, 1}, {2, 2}}}
 {{{2, 2}, {0, 0}}}
 </div>

 <div id="testQuads60_b">
 {{2,1}, {0,2}, {3,2}},
 {{3,2}, {2,3}},
 {{2,3}, {2,1}},
 {{0,0}, {2,0}},
 {{2,0}, {1,1}, {2,2}},
 {{2,2}, {0,0}},
 </div>

 <div id="skpelpais_com_18">
 {{183,8507}, {552,8506.99023}},
 {{552,8506.99023}, {552,8508}},
 {{552,8508}, {183,8508}},
 {{183,8508}, {183,8507}},
 op intersect
 {{183,8508}, {183,8506.99023}},
 {{183,8506.99023}, {552,8507}},
 {{552,8507}, {552,8508}},
 </div>

 <div id="skpwww_cityads_ru_249">
 {{{1000, 10.4003992f}, {1000, 13.3527431f}}}
 {{{1000, 13.3527431f}, {999.917603f, 13.2607508f}, {999.82843f, 13.1715727f}}}
 {{{1000, 13}, {999.969971f, 37.0299988f}}}
 </div>

 <div id="skpwww_maturesupertube_com_21">
     {{{{3.87867975f, 11831.8789f}, {4.7573595f, 11831}, {6, 11831}}},
      {{{2, 11830}, {4.5f, 11832.5f}}}},
 </div>

 <div id="loop1">
 {{1, 4, 2, 6, 0, 5, 4.5f, 4.33333302f
 {{2, 6, 0, 5, 4.5f, 4.33333302f, 1, 4
 {{{3, 5}, {2.33333325f, 4.33333349f}, {3.83333325f, 3.83333349f}, {2, 4}}}
 {{{2, 4}, {3, 5}, {2.33333325f, 4.33333349f}, {3.83333325f, 3.83333349f}}}
 </div>

 <div id="serp1">
 {{{0.55431359440952721, 2.1086271888190544}, {0.1588954256872922, 2.3078315988141811}, {0.57446808656344528, 2.1489361731268914}, {0, 1}}}
 {{{0.55431359440952721, 2.1086271888190544}, {0.1588954256872922, 2.3078315988141811}, {0.57446808656344528, 2.1489361731268914}, {0, 1}}}
 </div>
 <div id="serp2">
 {{{4.0946656649135988, 3.283996994740797}, {4.1983471074380168, 2.1074380165289259}, {4.5454545454545459, 1.3636363636363635}, {4, 3}}}
 {{{4.0946656649135988, 3.283996994740797}, {4.1983471074380168, 2.1074380165289259}, {4.5454545454545459, 1.3636363636363635}, {4, 3}}}
 </div>
 <div id="serp3">
 {{{2.2015477442471254, 1.1371488033013577}, {2.3167674423028526, 0.68323255769714741}, {2.4076432497431028, 0.59235675025689716}, {2, 1}}}
 {{{2.2015477442471254, 1.1371488033013577}, {2.3167674423028526, 0.68323255769714741}, {2.4076432497431028, 0.59235675025689716}, {2, 1}}}
 </div>

 <div id="skpwww_seopack_blogspot_com_2153">
 {{{924, 245.472672f}, {1143, 247}}}
 {{{1000, 246}, {927.340759f, 245.505722f}}}
 {{{999.892212f, 246}, {927.340759f, 245.505722f}}}
 </div>

 <div id="self1">
 {{{2, 3}, {0, 4}, {3, 2}, {5, 3}}}
 {{{2, 3}, {0, 4}, {3, 2}, {5, 3}}}
 </div>

 <div id="skpwww_pindosiya_com_99">
 {{{901.0869140625, 547}, {899, 556}}}
 {{{900.0235595703125, 551.60284423828125}, {900.06072998046875, 551.29705810546875}, {900.15655517578125, 551.0157470703125}}}
 </div>

 <div id="cubicLineMiss1">
 {{{-634.60540771484375, -481.262939453125}, {266.2696533203125, -752.70867919921875}, {-751.8370361328125, -317.37921142578125}, {-969.7427978515625, 824.7255859375}}}
 {{{-287.9506133720805678, -557.1376476615772617}, {-285.9506133720805678, -557.1376476615772617}}}
 </div>

 <div id="cubicLineMiss2">
 {{{-818.4456787109375, 248.218017578125}, {944.18505859375, -252.2330322265625}, {957.3946533203125, -45.43280029296875}, {-591.766357421875, 868.6187744140625}}}
 {{{435.1963493079119871, -16.42683763243891093}, {437.1963493079119871, -16.42683763243891093}}}
 </div>

 <div id="cubicLineMiss3">
 {{{-818.4456787109375, 248.218017578125}, {944.18505859375, -252.2330322265625}, {957.3946533203125, -45.43280029296875}, {-591.766357421875, 868.6187744140625}}}
 {{{397.5007682490800676, -17.35020084021140008}, {399.5007682490800676, -17.35020084021140008}}}
 </div>

 <div id="cubicLineMiss4">
 {{{-652.660888671875, -384.6475830078125}, {-551.7723388671875, -925.5025634765625}, {-321.06658935546875, -813.10345458984375}, {142.6982421875, -47.4503173828125}}}
 {{{-478.4372049758064236, -717.868282575075682}, {-476.4372049758064236, -717.868282575075682}}}
 </div>

 <div id="cubicLineErr1">
 {{{-954.4322509765625, 827.2216796875}, {-420.24017333984375, -7.80560302734375}, {799.134765625, -971.4295654296875}, {-556.23486328125, 344.400146484375}}}

 {{{58.57411390280688579, -302.8879316712078662}, {60.57411390280688579, -302.8879316712078662}}}
 </div>

 <div id="cubicLineErr2">
 {{{-634.60540771484375, -481.262939453125}, {266.2696533203125, -752.70867919921875}, {-751.8370361328125, -317.37921142578125}, {-969.7427978515625, 824.7255859375}}}
 {{{-287.95061337208057, -557.13764766157726}, {-285.95061337208057, -557.13764766157726}}}
 {{{-308.65463091760211, -549.4520029924679} -308.65463091760211, -569.4520029924679
 </div>

 <div id="skpwww_educationalcraft_com_4">
 {{{974.91998291015625, 1481.7769775390625}, {974.91998291015625, 1481.7760009765625}, {977.3189697265625, 1484.6190185546875}, {975.10699462890625, 1486.97802734375}}}
 {{fX=974.91998291015625 fY=1481.7769775390625 }, {fX=974.92071342468262 fY=1481.7972941398621 }} }
 </div>

 <div id="skpwww_educationalcraft_com_4a">
 {{{962.10699462890625, 1485.654052734375}, {962.10699462890625, 1485.654052734375}, {960.58502197265625, 1483.595947265625}, {957.53900146484375, 1482.0970458984375}}}
 {{{963.21502685546875, 1486.6700439453125}, {962.7449951171875, 1486.6700439453125}, {962.10699462890625, 1485.654052734375}, {962.10699462890625, 1485.654052734375}}}
 </div>

 <div id="skpwww_educationalcraft_com_4b">
 {{{980.9000244140625, 1474.3280029296875}, {980.9000244140625, 1474.3280029296875}, {978.89300537109375, 1471.95703125}, {981.791015625, 1469.487060546875}}}
 {{{981.791015625, 1469.487060546875}, {981.791015625, 1469.4859619140625}, {983.3580322265625, 1472.72900390625}, {980.9000244140625, 1474.3280029296875}}}
 </div>

 <div id="skpwww_aceinfographics_com_106">
 {{{168, 29.6722088f}, {166, 29.6773338f}}}
 {{{166.878677f, 29.6750813f}, {167.388f, 29.6763878f}, {168.019989f, 29.6769352f}}}
 </div>

 <div id="skpwww_tcmevents_org_13">
 {{{465.84668f, 547.288391f}, {467.274506f, 552.852356f}, {468.506836f, 560.718567f}}}
 {{{468.506836f, 560.718567f}, {467.336121f, 553.24585f}, {465.951904f, 547.960144f}}
 </div>

 <div id="skpwww_kitcheninspirations_wordpress_com_66">
 {{{60.8333359f, 27820.498f}, {47.1666679f, 27820.5f}}}
 {{{60.8333359f, 27820.668f}, {60.8333359f, 27820.498f}}}
 {{{47.1666679f, 27820.498f}, {60.8333359f, 27820.5f}}}
 {{{60.8333359f, 27820.5f}, {60.8333359f, 27820.668f}}}
 </div>

 <div id="skpwww_galaxystwo_com_4">
 {{{10105, 2510}, {10123, 2509.98999f}}}
 {{{10105, 2509.98999f}, {10123, 2510}}}
 </div>

 <div id="skpwww_wartepop_blogspot_com_br_6">
 {{{124.666672f, 152.333344f}, {125.909309f, 152.333344f}, {126.787994f, 153.309662f}}}
 {{fX=124.66666412353516 fY=152.33334350585937 }, {fX=126.78799438476562 fY=153.30966186523437 }} }
 {{fX=124.66666412353516 fY=152.33334350585937 }, {fX=127.02368927001953 fY=153.30966186523437 }} }
 </div>

 <div id="skpwww_wartepop_blogspot_com_br_6a">
 {{{124.666672f, 152.333344f}, {125.909309f, 152.333344f}, {126.787994f, 153.309662f}}}
 {{fX=124.66667175292969 fY=152.33334350585937 }, {fX=126.78799438476562 fY=153.30966186523437 }} }
 {{fX=124.66667175292969 fY=152.33334350585937 }, {fX=127.02368927001953 fY=153.30966186523437 }} }
 </div>

 <div id="skpcarrot_is24x">
 {{{1020.08099, 672.16198699999995}, {1020.08002, 630.73999000000003}, {986.50201400000003, 597.16198699999995}, {945.08099400000003, 597.16198699999995}}}
 {{{1020, 672}, {1020, 640.93395999999996}, {998.03301999999996, 618.96698000000004}}}
 </div>

 <div id="skpwww_9to5mac_com_64">
 {{{{365.848175,5081.15186}, {368,5103}}},
 {{{367.967712,5102.61084}, {368.278717,5105.71045}}}},
 </div>

 <div id="issue2753">
 {{50.6,117.001}, {50.6,117.001}, {164.601,85.2}, {188.201,117.601}},
 {{188.201,117.601}, {188.201,117.601}, {174.801,93}, {39,124.001}},
 computed quadratics set
 {{50.6,117.001}, {52.4926111,116.112083}, {81.0298889,109.956333}},
 {{81.0298889,109.956333}, {109.567167,103.800583}, {142.037778,103.045}},
 {{142.037778,103.045}, {174.508389,102.289417}, {188.201,117.601}},
 computed quadratics set
 {{188.201,117.601}, {189.210269,116.85838}, {179.697259,112.371148}},
 {{179.697259,112.371148}, {170.18425,107.883917}, {138.037741,108.563519}},
 {{138.037741,108.563519}, {105.891231,109.24312}, {39,124.001}},
 </div>

 <div id="battle6001">
 {{{0.111722f, -59.999897f}, {0.0895366594f, -59.999939f}, {0.0673542097f, -59.9999695f}, {0.0451717526f, -59.9999847f}}}
 {{{0.0451734141f, -59.9999847f}, {0.0438041016f, -59.9999886f}, {0.0424379632f, -59.9999886f}, {0.0410718247f, -59.9999886f}}}
 </div>

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     var activePt;

     var decimal_places = 3;

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     var draw_closest_t = false;
     var draw_cubic_red = false;
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     var draw_quarterpoint = 0;
     var draw_tangents = 1;
     var draw_sortpoint = 0;
     var retina_scale = !!window.devicePixelRatio;

     function parse(test, title) {
         var curveStrs = test.split("{{");
         var pattern = /-?\d+\.*\d*e?-?\d*/g;
         var curves = [];
         for (var c in curveStrs) {
             var curveStr = curveStrs[c];
             var points = curveStr.match(pattern);
             var pts = [];
             for (var wd in points) {
                 var num = parseFloat(points[wd]);
                 if (isNaN(num)) continue;
                 pts.push(num);
             }
             if (pts.length > 2)
                 curves.push(pts);
         }
         if (curves.length >= 1) {
             tests.push(curves);
             testTitles.push(title);
         }
     }

     function init(test) {
         var canvas = document.getElementById('canvas');
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         var resScale = retina_scale && window.devicePixelRatio ? window.devicePixelRatio : 1;
         var unscaledWidth = window.innerWidth - 20;
         var unscaledHeight = window.innerHeight - 20;
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         screenHeight = unscaledHeight;
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         canvas.height = unscaledHeight * resScale;
         canvas.style.width = unscaledWidth + 'px';
         canvas.style.height = unscaledHeight + 'px';
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         xmax = -Infinity;
         ymin = Infinity;
         ymax = -Infinity;
         for (var curves in test) {
             var curve = test[curves];
             var last = curve.length;
             for (var idx = 0; idx < last; idx += 2) {
                 xmin = Math.min(xmin, curve[idx]);
                 xmax = Math.max(xmax, curve[idx]);
                 ymin = Math.min(ymin, curve[idx + 1]);
                 ymax = Math.max(ymax, curve[idx + 1]);
             }
         }
         xmin -= 1;
         var testW = xmax - xmin;
         var testH = ymax - ymin;
         subscale = 1;
         while (testW * subscale < 0.1 && testH * subscale < 0.1) {
             subscale *= 10;
         }
         while (testW * subscale > 10 && testH * subscale > 10) {
             subscale /= 10;
         }
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         mouseX = (screenWidth / 2) / scale + srcLeft;
         mouseY = (screenHeight / 2) / scale + srcTop;
         initScale = scale;
     }

     function setScale(x0, x1, y0, y1) {
         var srcWidth = x1 - x0;
         var srcHeight = y1 - y0;
         var usableWidth = screenWidth;
         var xDigits = Math.ceil(Math.log(Math.abs(xmax)) / Math.log(10));
         var yDigits = Math.ceil(Math.log(Math.abs(ymax)) / Math.log(10));
         usableWidth -= (xDigits + yDigits) * 10;
         usableWidth -= decimal_places * 10;
         var hscale = usableWidth / srcWidth;
         var vscale = screenHeight / srcHeight;
         scale = Math.min(hscale, vscale);
         var invScale = 1 / scale;
         var sxmin = x0 - invScale * 5;
         var symin = y0 - invScale * 10;
         var sxmax = x1 + invScale * (6 * decimal_places + 10);
         var symax = y1 + invScale * 10;
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         srcHeight = symax - symin;
         hscale = usableWidth / srcWidth;
         vscale = screenHeight / srcHeight;
         scale = Math.min(hscale, vscale);
         srcLeft = sxmin;
         srcTop = symin;
     }

 function dxy_at_t(curve, t) {
     var dxy = {};
     if (curve.length == 6) {
         var a = t - 1;
         var b = 1 - 2 * t;
         var c = t;
         dxy.x = a * curve[0] + b * curve[2] + c * curve[4];
         dxy.y = a * curve[1] + b * curve[3] + c * curve[5];
     } else if (curve.length == 8) {
         var one_t = 1 - t;
         var a = curve[0];
         var b = curve[2];
         var c = curve[4];
         var d = curve[6];
         dxy.x = 3 * ((b - a) * one_t * one_t + 2 * (c - b) * t * one_t + (d - c) * t * t);
         a = curve[1];
         b = curve[3];
         c = curve[5];
         d = curve[7];
         dxy.y = 3 * ((b - a) * one_t * one_t + 2 * (c - b) * t * one_t + (d - c) * t * t);
     }
     return dxy;
 }

     var flt_epsilon = 1.19209290E-07;

     function approximately_zero(A) {
         return Math.abs(A) < flt_epsilon;
     }

     function approximately_zero_inverse(A) {
         return Math.abs(A) > (1 / flt_epsilon);
     }

     function quad_real_roots(A, B, C) {
         var s = [];
         var p = B / (2 * A);
         var q = C / A;
         if (approximately_zero(A) && (approximately_zero_inverse(p)
                 || approximately_zero_inverse(q))) {
             if (approximately_zero(B)) {
                 if (C == 0) {
                     s[0] = 0;
                 }
                 return s;
             }
             s[0] = -C / B;
             return s;
         }
         /* normal form: x^2 + px + q = 0 */
         var p2 = p * p;
         if (!approximately_zero(p2 - q) && p2 < q) {
             return s;
         }
         var sqrt_D = 0;
         if (p2 > q) {
             sqrt_D = Math.sqrt(p2 - q);
         }
         s[0] = sqrt_D - p;
         var flip = -sqrt_D - p;
         if (!approximately_zero(s[0] - flip)) {
             s[1] = flip;
         }
         return s;
     }

     function cubic_real_roots(A, B, C, D) {
         if (approximately_zero(A)) {  // we're just a quadratic
             return quad_real_roots(B, C, D);
         }
         if (approximately_zero(D)) {  // 0 is one root
             var s = quad_real_roots(A, B, C);
             for (var i = 0; i < s.length; ++i) {
                 if (approximately_zero(s[i])) {
                     return s;
                 }
             }
             s.push(0);
             return s;
         }
         if (approximately_zero(A + B + C + D)) {  // 1 is one root
             var s = quad_real_roots(A, A + B, -D);
             for (var i = 0; i < s.length; ++i) {
                 if (approximately_zero(s[i] - 1)) {
                     return s;
                 }
             }
             s.push(1);
             return s;
         }
         var a, b, c;
         var invA = 1 / A;
         a = B * invA;
         b = C * invA;
         c = D * invA;
         var a2 = a * a;
         var Q = (a2 - b * 3) / 9;
         var R = (2 * a2 * a - 9 * a * b + 27 * c) / 54;
         var R2 = R * R;
         var Q3 = Q * Q * Q;
         var R2MinusQ3 = R2 - Q3;
         var adiv3 = a / 3;
         var r;
         var roots = [];
         if (R2MinusQ3 < 0) {   // we have 3 real roots
             var theta = Math.acos(R / Math.sqrt(Q3));
             var neg2RootQ = -2 * Math.sqrt(Q);
             r = neg2RootQ * Math.cos(theta / 3) - adiv3;
             roots.push(r);
             r = neg2RootQ * Math.cos((theta + 2 * Math.PI) / 3) - adiv3;
             if (!approximately_zero(roots[0] - r)) {
                 roots.push(r);
             }
             r = neg2RootQ * Math.cos((theta - 2 * Math.PI) / 3) - adiv3;
             if (!approximately_zero(roots[0] - r) && (roots.length == 1
                         || !approximately_zero(roots[1] - r))) {
                 roots.push(r);
             }
         } else {  // we have 1 real root
             var sqrtR2MinusQ3 = Math.sqrt(R2MinusQ3);
             var A = Math.abs(R) + sqrtR2MinusQ3;
             A = Math.pow(A, 1/3);
             if (R > 0) {
                 A = -A;
             }
             if (A != 0) {
                 A += Q / A;
             }
             r = A - adiv3;
             roots.push(r);
             if (approximately_zero(R2 - Q3)) {
                 r = -A / 2 - adiv3;
                 if (!approximately_zero(s[0] - r)) {
                     roots.push(r);
                 }
             }
         }
         return roots;
     }

     function approximately_zero_or_more(tValue) {
         return tValue >= -flt_epsilon;
     }

     function approximately_one_or_less(tValue) {
         return tValue <= 1 + flt_epsilon;
     }

     function approximately_less_than_zero(tValue) {
         return tValue < flt_epsilon;
     }

     function approximately_greater_than_one(tValue) {
         return tValue > 1 - flt_epsilon;
     }

     function add_valid_ts(s) {
         var t = [];
     nextRoot:
         for (var index = 0; index < s.length; ++index) {
             var tValue = s[index];
             if (approximately_zero_or_more(tValue) && approximately_one_or_less(tValue)) {
                 if (approximately_less_than_zero(tValue)) {
                     tValue = 0;
                 } else if (approximately_greater_than_one(tValue)) {
                     tValue = 1;
                 }
                 for (var idx2 = 0; idx2 < t.length; ++idx2) {
                     if (approximately_zero(t[idx2] - tValue)) {
                         continue nextRoot;
                     }
                 }
                 t.push(tValue);
             }
         }
         return t;
     }

     function quad_roots(A, B, C) {
         var s = quad_real_roots(A, B, C);
         var foundRoots = add_valid_ts(s);
         return foundRoots;
     }

     function cubic_roots(A, B, C, D) {
         var s = cubic_real_roots(A, B, C, D);
         var foundRoots = add_valid_ts(s);
         return foundRoots;
     }

     function ray_curve_intersect(startPt, endPt, curve) {
         var adj = endPt[0] - startPt[0];
         var opp = endPt[1] - startPt[1];
         var r = [];
         for (var n = 0; n < curve.length / 2; ++n) {
             r[n] = (curve[n * 2 + 1] - startPt[1]) * adj - (curve[n * 2] - startPt[0]) * opp;
         }
         if (curve.length == 6) {
             var A = r[2];
             var B = r[1];
             var C = r[0];
             A += C - 2 * B;  // A = a - 2*b + c
             B -= C;  // B = -(b - c)
             return quad_roots(A, 2 * B, C);
         }
         var A = r[3];       // d
         var B = r[2] * 3;   // 3*c
         var C = r[1] * 3;   // 3*b
         var D = r[0];       // a
         A -= D - C + B;     // A =   -a + 3*b - 3*c + d
         B += 3 * D - 2 * C; // B =  3*a - 6*b + 3*c
         C -= 3 * D;         // C = -3*a + 3*b
         return cubic_roots(A, B, C, D);
     }

     function x_at_t(curve, t) {
         var one_t = 1 - t;
         if (curve.length == 4) {
             return one_t * curve[0] + t * curve[2];
         }
         var one_t2 = one_t * one_t;
         var t2 = t * t;
         if (curve.length == 6) {
             return one_t2 * curve[0] + 2 * one_t * t * curve[2] + t2 * curve[4];
         }
         var a = one_t2 * one_t;
         var b = 3 * one_t2 * t;
         var c = 3 * one_t * t2;
         var d = t2 * t;
         return a * curve[0] + b * curve[2] + c * curve[4] + d * curve[6];
     }

     function y_at_t(curve, t) {
         var one_t = 1 - t;
         if (curve.length == 4) {
             return one_t * curve[1] + t * curve[3];
         }
         var one_t2 = one_t * one_t;
         var t2 = t * t;
         if (curve.length == 6) {
             return one_t2 * curve[1] + 2 * one_t * t * curve[3] + t2 * curve[5];
         }
         var a = one_t2 * one_t;
         var b = 3 * one_t2 * t;
         var c = 3 * one_t * t2;
         var d = t2 * t;
         return a * curve[1] + b * curve[3] + c * curve[5] + d * curve[7];
     }

     function drawPointAtT(curve) {
         var x = x_at_t(curve, curveT);
         var y = y_at_t(curve, curveT);
         drawPoint(x, y);
     }

     function drawLine(x1, y1, x2, y2) {
         ctx.beginPath();
         ctx.moveTo((x1 - srcLeft) * scale,
                 (y1 - srcTop) * scale);
         ctx.lineTo((x2 - srcLeft) * scale,
                 (y2 - srcTop) * scale);
         ctx.stroke();
     }

     function drawPoint(px, py) {
         for (var pts = 0; pts < drawnPts.length; pts += 2) {
             var x = drawnPts[pts];
             var y = drawnPts[pts + 1];
             if (px == x && py == y) {
                 return;
             }
         }
         drawnPts.push(px);
         drawnPts.push(py);
         var _px = (px - srcLeft) * scale;
         var _py = (py - srcTop) * scale;
         ctx.beginPath();
         ctx.arc(_px, _py, 3, 0, Math.PI * 2, true);
         ctx.closePath();
         ctx.stroke();
         if (draw_point_xy) {
             var label = px.toFixed(decimal_places) + ", " + py.toFixed(decimal_places);
             ctx.font = "normal 10px Arial";
             ctx.textAlign = "left";
             ctx.fillStyle = "black";
             ctx.fillText(label, _px + 5, _py);
         }
     }

     function drawPointSolid(px, py) {
         drawPoint(px, py);
         ctx.fillStyle = "rgba(0,0,0, 0.4)";
         ctx.fill();
     }

     function crossPt(origin, pt1, pt2) {
         return ((pt1[0] - origin[0]) * (pt2[1] - origin[1])
               - (pt1[1] - origin[1]) * (pt2[0] - origin[0])) > 0 ? 0 : 1;
     }

     // may not work well for cubics
     function curveClosestT(curve, x, y) {
         var closest = -1;
         var closestDist = Infinity;
         var l = Infinity, t = Infinity, r = -Infinity, b = -Infinity;
         for (var i = 0; i < 16; ++i) {
             var testX = x_at_t(curve, i / 16);
             l = Math.min(testX, l);
             r = Math.max(testX, r);
             var testY = y_at_t(curve, i / 16);
             t = Math.min(testY, t);
             b = Math.max(testY, b);
             var dx = testX - x;
             var dy = testY - y;
             var dist = dx * dx + dy * dy;
             if (closestDist > dist) {
                 closestDist = dist;
                 closest = i;
             }
         }
         var boundsX = r - l;
         var boundsY = b - t;
         var boundsDist = boundsX * boundsX + boundsY * boundsY;
         if (closestDist > boundsDist) {
             return -1;
         }
         console.log("closestDist = " + closestDist + " boundsDist = " + boundsDist
                 + " t = " + closest / 16);
         return closest / 16;
     }

     function draw(test, title) {
         ctx.font = "normal 50px Arial";
         ctx.textAlign = "left";
         ctx.fillStyle = "rgba(0,0,0, 0.1)";
         ctx.fillText(title, 50, 50);
         ctx.font = "normal 10px Arial";
         //  ctx.lineWidth = "1.001"; "0.999";
         var hullStarts = [];
         var hullEnds = [];
         var midSpokes = [];
         var midDist = [];
         var origin = [];
         var shortSpokes = [];
         var shortDist = [];
         var sweeps = [];
         drawnPts = [];
         for (var curves in test) {
             var curve = test[curves];
             origin.push(curve[0]);
             origin.push(curve[1]);
             var startPt = [];
             startPt.push(curve[2]);
             startPt.push(curve[3]);
             hullStarts.push(startPt);
             var endPt = [];
             if (curve.length == 4) {
                 endPt.push(curve[2]);
                 endPt.push(curve[3]);
             } else if (curve.length == 6) {
                 endPt.push(curve[4]);
                 endPt.push(curve[5]);
             } else if (curve.length == 8) {
                 endPt.push(curve[6]);
                 endPt.push(curve[7]);
             }
             hullEnds.push(endPt);
             var sweep = crossPt(origin, startPt, endPt);
             sweeps.push(sweep);
             var midPt = [];
             midPt.push(x_at_t(curve, 0.5));
             midPt.push(y_at_t(curve, 0.5));
             midSpokes.push(midPt);
             var shortPt = [];
             shortPt.push(x_at_t(curve, 0.25));
             shortPt.push(y_at_t(curve, 0.25));
             shortSpokes.push(shortPt);
             var dx = midPt[0] - origin[0];
             var dy = midPt[1] - origin[1];
             var dist = Math.sqrt(dx * dx + dy * dy);
             midDist.push(dist);
             dx = shortPt[0] - origin[0];
             dy = shortPt[1] - origin[1];
             dist = Math.sqrt(dx * dx + dy * dy);
             shortDist.push(dist);
         }
         var intersect = [];
         var useIntersect = false;
         var maxWidth = Math.max(xmax - xmin, ymax - ymin);
         for (var curves in test) {
             var curve = test[curves];
             if (curve.length == 6 || curve.length == 8) {
                 var opp = curves == 0 || curves == 1 ? 0 : 1;
                 var sects = ray_curve_intersect(origin, hullEnds[opp], curve);
                 intersect.push(sects);
                 if (sects.length > 1) {
                     var intersection = sects[0];
                     if (intersection == 0) {
                         intersection = sects[1];
                     }
                     var ix = x_at_t(curve, intersection) - origin[0];
                     var iy = y_at_t(curve, intersection) - origin[1];
                     var ex = hullEnds[opp][0] - origin[0];
                     var ey = hullEnds[opp][1] - origin[1];
                     if (ix * ex >= 0 && iy * ey >= 0) {
                         var iDist = Math.sqrt(ix * ix + iy * iy);
                         var eDist = Math.sqrt(ex * ex + ey * ey);
                         var delta = Math.abs(iDist - eDist) / maxWidth;
                         if (delta > (curve.length == 6 ? 1e-5 : 1e-4)) {
                             useIntersect ^= true;
                         }
                     }
                 }
             }
         }
         var midLeft = curves != 0 ? crossPt(origin, midSpokes[0], midSpokes[1]) : 0;
         var firstInside;
         if (useIntersect) {
             var sect1 = intersect[0].length > 1;
             var sIndex = sect1 ? 0 : 1;
             var sects = intersect[sIndex];
             var intersection = sects[0];
             if (intersection == 0) {
                 intersection = sects[1];
             }
             var curve = test[sIndex];
             var ix = x_at_t(curve, intersection) - origin[0];
             var iy = y_at_t(curve, intersection) - origin[1];
             var opp = sect1 ? 1 : 0;
             var ex = hullEnds[opp][0] - origin[0];
             var ey = hullEnds[opp][1] - origin[1];
             var iDist = ix * ix + iy * iy;
             var eDist = ex * ex + ey * ey;
             firstInside = (iDist > eDist) ^ (sIndex == 0) ^ sweeps[0];
 //            console.log("iDist=" + iDist + " eDist=" + eDist + " sIndex=" + sIndex
  //                   + " sweeps[0]=" + sweeps[0]);
         } else {
  //           console.log("midLeft=" + midLeft);
             firstInside = midLeft != 0;
         }
         var shorter = midDist[1] < midDist[0];
         var shortLeft = shorter ? crossPt(origin, shortSpokes[0], midSpokes[1])
                 : crossPt(origin, midSpokes[0], shortSpokes[1]);
         var startCross = crossPt(origin, hullStarts[0], hullStarts[1]);
         var disallowShort = midLeft == startCross && midLeft == sweeps[0]
                     && midLeft == sweeps[1];

   //      console.log("midLeft=" + midLeft + " startCross=" + startCross);
         var intersectIndex = 0;
         for (var curves in test) {
             var curve = test[curves];
             if (curve.length != 4 && curve.length != 6 && curve.length != 8) {
                 continue;
             }
             ctx.lineWidth = 1;
             if (draw_tangents != 0) {
                 if (draw_cubic_red ? curve.length == 8 : firstInside == curves) {
                     ctx.strokeStyle = "rgba(255,0,0, 0.3)";
                 } else {
                     ctx.strokeStyle = "rgba(0,0,255, 0.3)";
                 }
                 drawLine(curve[0], curve[1], curve[2], curve[3]);
                 if (draw_tangents != 2) {
                     if (curve.length > 4) drawLine(curve[2], curve[3], curve[4], curve[5]);
                     if (curve.length > 6) drawLine(curve[4], curve[5], curve[6], curve[7]);
                 }
                 if (draw_tangents != 1) {
                     if (curve.length == 6) drawLine(curve[0], curve[1], curve[4], curve[5]);
                     if (curve.length == 8) drawLine(curve[0], curve[1], curve[6], curve[7]);
                 }
             }
             ctx.beginPath();
             ctx.moveTo((curve[0] - srcLeft) * scale, (curve[1] - srcTop) * scale);
             if (curve.length == 4) {
                 ctx.lineTo((curve[2] - srcLeft) * scale, (curve[3] - srcTop) * scale);
             } else if (curve.length == 6) {
                 ctx.quadraticCurveTo(
                     (curve[2] - srcLeft) * scale, (curve[3] - srcTop) * scale,
                     (curve[4] - srcLeft) * scale, (curve[5] - srcTop) * scale);
             } else {
                 ctx.bezierCurveTo(
                     (curve[2] - srcLeft) * scale, (curve[3] - srcTop) * scale,
                     (curve[4] - srcLeft) * scale, (curve[5] - srcTop) * scale,
                     (curve[6] - srcLeft) * scale, (curve[7] - srcTop) * scale);
             }
             if (draw_cubic_red ? curve.length == 8 : firstInside == curves) {
                 ctx.strokeStyle = "rgba(255,0,0, 1)";
             } else {
                 ctx.strokeStyle = "rgba(0,0,255, 1)";
             }
             ctx.stroke();
             if (draw_endpoints) {
                 drawPoint(curve[0], curve[1]);
                 drawPoint(curve[2], curve[3]);
                 if (curve.length > 4) drawPoint(curve[4], curve[5]);
                 if (curve.length > 6) drawPoint(curve[6], curve[7]);
             }
             if (draw_midpoint != 0) {
                 if ((curves == 0) == (midLeft == 0)) {
                     ctx.strokeStyle = "rgba(0,180,127, 0.6)";
                 } else {
                     ctx.strokeStyle = "rgba(127,0,127, 0.6)";
                 }
                 var midX = x_at_t(curve, 0.5);
                 var midY = y_at_t(curve, 0.5);
                 drawPointSolid(midX, midY);
                 if (draw_midpoint > 1) {
                     drawLine(curve[0], curve[1], midX, midY);
                 }
             }
             if (draw_quarterpoint != 0) {
                 if ((curves == 0) == (shortLeft == 0)) {
                     ctx.strokeStyle = "rgba(0,191,63, 0.6)";
                 } else {
                     ctx.strokeStyle = "rgba(63,0,191, 0.6)";
                 }
                 var midT = (curves == 0) == shorter ? 0.25 : 0.5;
                 var midX = x_at_t(curve, midT);
                 var midY = y_at_t(curve, midT);
                 drawPointSolid(midX, midY);
                 if (draw_quarterpoint > 1) {
                     drawLine(curve[0], curve[1], midX, midY);
                 }
             }
             if (draw_sortpoint != 0) {
                 if ((curves == 0) == ((disallowShort == -1 ? midLeft : shortLeft) == 0)) {
                     ctx.strokeStyle = "rgba(0,155,37, 0.6)";
                 } else {
                     ctx.strokeStyle = "rgba(37,0,155, 0.6)";
                 }
                 var midT = (curves == 0) == shorter && disallowShort != curves ? 0.25 : 0.5;
                 console.log("curves=" + curves + " disallowShort=" + disallowShort
                         + " midLeft=" + midLeft + " shortLeft=" + shortLeft
                         + " shorter=" + shorter + " midT=" + midT);
                 var midX = x_at_t(curve, midT);
                 var midY = y_at_t(curve, midT);
                 drawPointSolid(midX, midY);
                 if (draw_sortpoint > 1) {
                     drawLine(curve[0], curve[1], midX, midY);
                 }
             }
             if (draw_ray_intersect != 0) {
                 ctx.strokeStyle = "rgba(75,45,199, 0.6)";
                 if (curve.length == 6 || curve.length == 8) {
                     var intersections = intersect[intersectIndex];
                     for (var i in intersections) {
                         var intersection = intersections[i];
                         var x = x_at_t(curve, intersection);
                         var y = y_at_t(curve, intersection);
                         drawPointSolid(x, y);
                         if (draw_ray_intersect > 1) {
                             drawLine(curve[0], curve[1], x, y);
                         }
                     }
                 }
                 ++intersectIndex;
             }
             if (draw_order) {
                 var px = x_at_t(curve, 0.75);
                 var py = y_at_t(curve, 0.75);
                 var _px = (px - srcLeft) * scale;
                 var _py = (py - srcTop) * scale;
                 ctx.beginPath();
                 ctx.arc(_px, _py, 15, 0, Math.PI * 2, true);
                 ctx.closePath();
                 ctx.fillStyle = "white";
                 ctx.fill();
                 if (draw_cubic_red ? curve.length == 8 : firstInside == curves) {
                     ctx.strokeStyle = "rgba(255,0,0, 1)";
                     ctx.fillStyle = "rgba(255,0,0, 1)";
                 } else {
                     ctx.strokeStyle = "rgba(0,0,255, 1)";
                     ctx.fillStyle = "rgba(0,0,255, 1)";
                 }
                 ctx.stroke();
                 ctx.font = "normal 16px Arial";
                 ctx.textAlign = "center";
                 ctx.fillText(parseInt(curves) + 1, _px, _py + 5);
             }
             if (draw_closest_t) {
                 var t = curveClosestT(curve, mouseX, mouseY);
                 if (t >= 0) {
                     var x = x_at_t(curve, t);
                     var y = y_at_t(curve, t);
                     drawPointSolid(x, y);
                 }
             }
             if (!approximately_zero(scale - initScale)) {
                 ctx.font = "normal 20px Arial";
                 ctx.fillStyle = "rgba(0,0,0, 0.3)";
                 ctx.textAlign = "right";
                 ctx.fillText(scale.toFixed(decimal_places) + 'x',
                         screenWidth - 10, screenHeight - 5);
             }
             if (draw_t) {
                 drawPointAtT(curve);
             }
         }
         if (draw_t) {
             drawCurveTControl();
         }
     }

     function drawCurveTControl() {
         ctx.lineWidth = 2;
         ctx.strokeStyle = "rgba(0,0,0, 0.3)";
         ctx.beginPath();
         ctx.rect(screenWidth - 80, 40, 28, screenHeight - 80);
         ctx.stroke();
         var ty = 40 + curveT * (screenHeight - 80);
         ctx.beginPath();
         ctx.moveTo(screenWidth - 80, ty);
         ctx.lineTo(screenWidth - 85, ty - 5);
         ctx.lineTo(screenWidth - 85, ty + 5);
         ctx.lineTo(screenWidth - 80, ty);
         ctx.fillStyle = "rgba(0,0,0, 0.6)";
         ctx.fill();
         var num = curveT.toFixed(decimal_places);
         ctx.font = "normal 10px Arial";
         ctx.textAlign = "left";
         ctx.fillText(num, screenWidth - 78, ty);
     }

     function ptInTControl() {
         var e = window.event;
         var tgt = e.target || e.srcElement;
         var left = tgt.offsetLeft;
         var top = tgt.offsetTop;
         var x = (e.clientX - left);
         var y = (e.clientY - top);
         if (x < screenWidth - 80 || x > screenWidth - 50) {
             return false;
         }
         if (y < 40 || y > screenHeight - 80) {
             return false;
         }
         curveT = (y - 40) / (screenHeight - 120);
         if (curveT < 0 || curveT > 1) {
             throw "stop execution";
         }
         return true;
     }

     function drawTop() {
         init(tests[testIndex]);
         redraw();
     }

     function redraw() {
         ctx.beginPath();
         ctx.rect(0, 0, ctx.canvas.width, ctx.canvas.height);
         ctx.fillStyle = "white";
         ctx.fill();
         draw(tests[testIndex], testTitles[testIndex]);
     }

     function doKeyPress(evt) {
         var char = String.fromCharCode(evt.charCode);
         switch (char) {
             case '0':
             case '1':
             case '2':
             case '3':
             case '4':
             case '5':
             case '6':
             case '7':
             case '8':
             case '9':
                 decimal_places = char - '0';
                 redraw();
                 break;
             case '-':
                 scale /= 2;
                 calcLeftTop();
                 redraw();
                 break;
             case '=':
             case '+':
                 scale *= 2;
                 calcLeftTop();
                 redraw();
                 break;
             case 'b':
                 draw_cubic_red ^= true;
                 redraw();
                 break;
             case 'c':
                 drawTop();
                 break;
             case 'd':
                 var test = tests[testIndex];
                 var testClone = [];
                 for (var curves in test) {
                     var c = test[curves];
                     var cClone = [];
                     for (var index = 0; index < c.length; ++index) {
                         cClone.push(c[index]);
                     }
                     testClone.push(cClone);
                 }
                 tests.push(testClone);
                 testTitles.push(testTitles[testIndex] + " copy");
                 testIndex = tests.length - 1;
                 redraw();
                 break;
             case 'e':
                 draw_endpoints ^= true;
                 redraw();
                 break;
             case 'f':
                 draw_derivative ^= true;
                 redraw();
                 break;
             case 'i':
                 draw_ray_intersect = (draw_ray_intersect + 1) % 3;
                 redraw();
                 break;
             case 'l':
                 var test = tests[testIndex];
                 console.log("<div id=\"" + testTitles[testIndex] + "\" >");
                 for (var curves in test) {
                     var c = test[curves];
                     var s = "{{";
                     for (var i = 0; i < c.length; i += 2) {
                         s += "{";
                         s += c[i] + "," + c[i + 1];
                         s += "}";
                         if (i + 2 < c.length) {
                             s += ", ";
                         }
                     }
                     console.log(s + "}},");
                 }
                 console.log("</div>");
                 break;
             case 'm':
                 draw_midpoint = (draw_midpoint + 1) % 3;
                 redraw();
                 break;
             case 'N':
                 testIndex += 9;
             case 'n':
                 testIndex = (testIndex + 1) % tests.length;
                 drawTop();
                 break;
             case 'o':
                 draw_order ^= true;
                 redraw();
                 break;
             case 'P':
                 testIndex -= 9;
             case 'p':
                 if (--testIndex < 0)
                     testIndex = tests.length - 1;
                 drawTop();
                 break;
             case 'q':
                 draw_quarterpoint = (draw_quarterpoint + 1) % 3;
                 redraw();
                 break;
             case 'r':
                 for (var i = 0; i < testDivs.length; ++i) {
                     var title = testDivs[i].id.toString();
                     if (title == testTitles[testIndex]) {
                         var str = testDivs[i].firstChild.data;
                         parse(str, title);
                         var original = tests.pop();
                         testTitles.pop();
                         tests[testIndex] = original;
                         break;
                     }
                 }
                 redraw();
                 break;
             case 's':
                 draw_sortpoint = (draw_sortpoint + 1) % 3;
                 redraw();
                 break;
             case 't':
                 draw_t ^= true;
                 redraw();
                 break;
             case 'u':
                 draw_closest_t ^= true;
                 redraw();
                 break;
             case 'v':
                 draw_tangents = (draw_tangents + 1) % 4;
                 redraw();
                 break;
             case 'x':
                 draw_point_xy ^= true;
                 redraw();
                 break;
             case 'y':
                 draw_mouse_xy ^= true;
                 redraw();
                 break;
             case '\\':
                 retina_scale ^= true;
                 drawTop();
                 break;
         }
     }

     function doKeyDown(evt) {
         var char = evt.keyCode;
         var preventDefault = false;
         switch (char) {
             case 37: // left arrow
                 if (evt.shiftKey) {
                     testIndex -= 9;
                 }
                 if (--testIndex < 0)
                     testIndex = tests.length - 1;
                 drawTop();
                 preventDefault = true;
                 break;
             case 39: // right arrow
                 if (evt.shiftKey) {
                     testIndex += 9;
                 }
                 if (++testIndex >= tests.length)
                     testIndex = 0;
                 drawTop();
                 preventDefault = true;
                 break;
         }
         if (preventDefault) {
             evt.preventDefault();
             return false;
         }
         return true;
     }

     function calcXY() {
         var e = window.event;
         var tgt = e.target || e.srcElement;
         var left = tgt.offsetLeft;
         var top = tgt.offsetTop;
         mouseX = (e.clientX - left) / scale + srcLeft;
         mouseY = (e.clientY - top) / scale + srcTop;
     }

     function calcLeftTop() {
         srcLeft = mouseX - screenWidth / 2 / scale;
         srcTop = mouseY - screenHeight / 2 / scale;
     }

     function handleMouseClick() {
         if (!draw_t || !ptInTControl()) {
             calcXY();
         } else {
             redraw();
         }
     }

     function initDown() {
         var test = tests[testIndex];
         var bestDistance = 1000000;
         activePt = -1;
         for (var curves in test) {
             var testCurve = test[curves];
             if (testCurve.length != 4 && testCurve.length != 6 && testCurve.length != 8) {
                 continue;
             }
             for (var i = 0; i < testCurve.length; i += 2) {
                 var testX = testCurve[i];
                 var testY = testCurve[i + 1];
                 var dx = testX - mouseX;
                 var dy = testY - mouseY;
                 var dist = dx * dx + dy * dy;
                 if (dist > bestDistance) {
                     continue;
                 }
                 activeCurve = testCurve;
                 activePt = i;
                 bestDistance = dist;
             }
         }
         if (activePt >= 0) {
             lastX = mouseX;
             lastY = mouseY;
         }
     }

     function handleMouseOver() {
         calcXY();
         if (draw_mouse_xy) {
             var num = mouseX.toFixed(decimal_places) + ", " + mouseY.toFixed(decimal_places);
             ctx.beginPath();
             ctx.rect(300, 100, num.length * 6, 10);
             ctx.fillStyle = "white";
             ctx.fill();
             ctx.font = "normal 10px Arial";
             ctx.fillStyle = "black";
             ctx.textAlign = "left";
             ctx.fillText(num, 300, 108);
         }
         if (!mouseDown) {
             activePt = -1;
             return;
         }
         if (activePt < 0) {
             initDown();
             return;
         }
         var deltaX = mouseX - lastX;
         var deltaY = mouseY - lastY;
         lastX = mouseX;
         lastY = mouseY;
         if (activePt == 0) {
             var test = tests[testIndex];
             for (var curves in test) {
                 var testCurve = test[curves];
                 testCurve[0] += deltaX;
                 testCurve[1] += deltaY;
             }
         } else {
             activeCurve[activePt] += deltaX;
             activeCurve[activePt + 1] += deltaY;
         }
         redraw();
     }

     function start() {
         for (var i = 0; i < testDivs.length; ++i) {
             var title = testDivs[i].id.toString();
             var str = testDivs[i].firstChild.data;
             parse(str, title);
         }
         drawTop();
         window.addEventListener('keypress', doKeyPress, true);
         window.addEventListener('keydown', doKeyDown, true);
         window.onresize = function () {
             drawTop();
         }
     }

 </script>
 </head>

 <body onLoad="start();">

 <canvas id="canvas" width="750" height="500"
     onmousedown="mouseDown = true"
     onmouseup="mouseDown = false"
     onmousemove="handleMouseOver()"
     onclick="handleMouseClick()"
     ></canvas >
 </body>
 </html>