| |
| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| #include "SampleCode.h" |
| #include "SkAnimTimer.h" |
| #include "SkBlurMask.h" |
| #include "SkBlurMaskFilter.h" |
| #include "SkColorFilter.h" |
| #include "SkCamera.h" |
| #include "SkCanvas.h" |
| #include "SkPath.h" |
| #include "SkPathOps.h" |
| #include "SkPoint3.h" |
| #include "SkShadowUtils.h" |
| #include "SkUtils.h" |
| #include "SkView.h" |
| #include "sk_tool_utils.h" |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| class ShadowsView : public SampleView { |
| SkPath fRectPath; |
| SkPath fRRPath; |
| SkPath fCirclePath; |
| SkPath fFunkyRRPath; |
| SkPath fCubicPath; |
| SkPath fSquareRRectPath; |
| SkPath fWideRectPath; |
| SkPath fWideOvalPath; |
| SkPoint3 fLightPos; |
| SkScalar fZDelta; |
| SkScalar fAnimTranslate; |
| SkScalar fAnimAngle; |
| |
| bool fShowAmbient; |
| bool fShowSpot; |
| bool fUseAlt; |
| bool fShowObject; |
| bool fIgnoreShadowAlpha; |
| |
| public: |
| ShadowsView() |
| : fZDelta(0) |
| , fAnimTranslate(0) |
| , fAnimAngle(0) |
| , fShowAmbient(true) |
| , fShowSpot(true) |
| , fUseAlt(false) |
| , fShowObject(true) |
| , fIgnoreShadowAlpha(false) {} |
| |
| protected: |
| void onOnceBeforeDraw() override { |
| fCirclePath.addCircle(0, 0, 50); |
| fRectPath.addRect(SkRect::MakeXYWH(-100, -50, 200, 100)); |
| fRRPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-100, -50, 200, 100), 4, 4)); |
| fFunkyRRPath.addRoundRect(SkRect::MakeXYWH(-50, -50, SK_Scalar1 * 100, SK_Scalar1 * 100), |
| 40 * SK_Scalar1, 20 * SK_Scalar1, |
| SkPath::kCW_Direction); |
| fCubicPath.cubicTo(100 * SK_Scalar1, 50 * SK_Scalar1, |
| 20 * SK_Scalar1, 100 * SK_Scalar1, |
| 0 * SK_Scalar1, 0 * SK_Scalar1); |
| fSquareRRectPath.addRRect(SkRRect::MakeRectXY(SkRect::MakeXYWH(-50, -50, 100, 100), |
| 10, 10)); |
| fWideRectPath.addRect(SkRect::MakeXYWH(0, 0, 630, 70)); |
| fWideOvalPath.addOval(SkRect::MakeXYWH(0, 0, 630, 70)); |
| |
| fLightPos = SkPoint3::Make(350, 0, 600); |
| } |
| |
| // overrides from SkEventSink |
| bool onQuery(SkEvent* evt) override { |
| if (SampleCode::TitleQ(*evt)) { |
| SampleCode::TitleR(evt, "AndroidShadows"); |
| return true; |
| } |
| |
| SkUnichar uni; |
| if (SampleCode::CharQ(*evt, &uni)) { |
| bool handled = false; |
| switch (uni) { |
| case 'W': |
| fShowAmbient = !fShowAmbient; |
| handled = true; |
| break; |
| case 'S': |
| fShowSpot = !fShowSpot; |
| handled = true; |
| break; |
| case 'T': |
| fUseAlt = !fUseAlt; |
| handled = true; |
| break; |
| case 'O': |
| fShowObject = !fShowObject; |
| handled = true; |
| break; |
| case '>': |
| fZDelta += 0.5f; |
| handled = true; |
| break; |
| case '<': |
| fZDelta -= 0.5f; |
| handled = true; |
| break; |
| case '?': |
| fIgnoreShadowAlpha = !fIgnoreShadowAlpha; |
| handled = true; |
| break; |
| default: |
| break; |
| } |
| if (handled) { |
| this->inval(nullptr); |
| return true; |
| } |
| } |
| return this->INHERITED::onQuery(evt); |
| } |
| |
| void drawBG(SkCanvas* canvas) { |
| canvas->drawColor(0xFFDDDDDD); |
| } |
| |
| void drawShadowedPath(SkCanvas* canvas, const SkPath& path, |
| const SkPoint3& zPlaneParams, |
| const SkPaint& paint, SkScalar ambientAlpha, |
| const SkPoint3& lightPos, SkScalar lightWidth, SkScalar spotAlpha) { |
| if (fIgnoreShadowAlpha) { |
| ambientAlpha = 255; |
| spotAlpha = 255; |
| } |
| if (!fShowAmbient) { |
| ambientAlpha = 0; |
| } |
| if (!fShowSpot) { |
| spotAlpha = 0; |
| } |
| uint32_t flags = 0; |
| if (fUseAlt) { |
| flags |= SkShadowFlags::kGeometricOnly_ShadowFlag; |
| } |
| |
| SkShadowUtils::DrawShadow(canvas, path, zPlaneParams, |
| lightPos, lightWidth, |
| ambientAlpha, spotAlpha, SK_ColorBLACK, flags); |
| |
| if (fShowObject) { |
| canvas->drawPath(path, paint); |
| } else { |
| SkPaint strokePaint; |
| |
| strokePaint.setColor(paint.getColor()); |
| strokePaint.setStyle(SkPaint::kStroke_Style); |
| |
| canvas->drawPath(path, strokePaint); |
| } |
| } |
| |
| void onDrawContent(SkCanvas* canvas) override { |
| this->drawBG(canvas); |
| const SkScalar kLightWidth = 800; |
| const SkScalar kAmbientAlpha = 0.1f; |
| const SkScalar kSpotAlpha = 0.25f; |
| |
| SkPaint paint; |
| paint.setAntiAlias(true); |
| |
| SkPoint3 lightPos = fLightPos; |
| SkPoint3 zPlaneParams = SkPoint3::Make(0, 0, 0); |
| |
| paint.setColor(SK_ColorWHITE); |
| canvas->translate(200, 90); |
| zPlaneParams.fZ = SkTMax(1.0f, 2 + fZDelta); |
| this->drawShadowedPath(canvas, fRRPath, zPlaneParams, paint, kAmbientAlpha, |
| lightPos, kLightWidth, kSpotAlpha); |
| |
| paint.setColor(SK_ColorRED); |
| canvas->translate(250, 0); |
| zPlaneParams.fZ = SkTMax(1.0f, 8 + fZDelta); |
| this->drawShadowedPath(canvas, fRectPath, zPlaneParams, paint, kAmbientAlpha, |
| lightPos, kLightWidth, kSpotAlpha); |
| |
| paint.setColor(SK_ColorBLUE); |
| canvas->translate(-250, 110); |
| zPlaneParams.fZ = SkTMax(1.0f, 12 + fZDelta); |
| this->drawShadowedPath(canvas, fCirclePath, zPlaneParams, paint, kAmbientAlpha, |
| lightPos, kLightWidth, 0.5f); |
| |
| paint.setColor(SK_ColorGREEN); |
| canvas->translate(250, 0); |
| zPlaneParams.fZ = SkTMax(1.0f, 64 + fZDelta); |
| this->drawShadowedPath(canvas, fRRPath, zPlaneParams, paint, kAmbientAlpha, |
| lightPos, kLightWidth, kSpotAlpha); |
| |
| paint.setColor(SK_ColorYELLOW); |
| canvas->translate(-250, 110); |
| zPlaneParams.fZ = SkTMax(1.0f, 8 + fZDelta); |
| this->drawShadowedPath(canvas, fFunkyRRPath, zPlaneParams, paint, kAmbientAlpha, |
| lightPos, kLightWidth, kSpotAlpha); |
| |
| paint.setColor(SK_ColorCYAN); |
| canvas->translate(250, 0); |
| zPlaneParams.fZ = SkTMax(1.0f, 16 + fZDelta); |
| this->drawShadowedPath(canvas, fCubicPath, zPlaneParams, paint, |
| kAmbientAlpha, lightPos, kLightWidth, kSpotAlpha); |
| |
| // circular reveal |
| SkPath tmpPath; |
| SkPath tmpClipPath; |
| tmpClipPath.addCircle(fAnimTranslate, 0, 60); |
| Op(fSquareRRectPath, tmpClipPath, kIntersect_SkPathOp, &tmpPath); |
| |
| paint.setColor(SK_ColorMAGENTA); |
| canvas->translate(-125, 60); |
| zPlaneParams.fZ = SkTMax(1.0f, 32 + fZDelta); |
| this->drawShadowedPath(canvas, tmpPath, zPlaneParams, paint, .1f, |
| lightPos, kLightWidth, .5f); |
| |
| // perspective paths |
| SkPoint pivot = SkPoint::Make(fWideRectPath.getBounds().width()/2, |
| fWideRectPath.getBounds().height()/2); |
| SkPoint translate = SkPoint::Make(100, 450); |
| paint.setColor(SK_ColorWHITE); |
| Sk3DView view; |
| view.save(); |
| view.rotateX(fAnimAngle); |
| SkMatrix persp; |
| view.getMatrix(&persp); |
| persp.preTranslate(-pivot.fX, -pivot.fY); |
| persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY); |
| canvas->setMatrix(persp); |
| SkScalar radians = SkDegreesToRadians(fAnimAngle); |
| zPlaneParams = SkPoint3::Make(0, |
| SkScalarSin(-radians), |
| SkTMax(1.0f, 16 + fZDelta) - SkScalarSin(-radians)*pivot.fY); |
| this->drawShadowedPath(canvas, fWideRectPath, zPlaneParams, paint, .1f, |
| lightPos, kLightWidth, .5f); |
| |
| pivot = SkPoint::Make(fWideOvalPath.getBounds().width() / 2, |
| fWideOvalPath.getBounds().height() / 2); |
| translate = SkPoint::Make(100, 600); |
| view.restore(); |
| view.rotateY(fAnimAngle); |
| view.getMatrix(&persp); |
| persp.preTranslate(-pivot.fX, -pivot.fY); |
| persp.postTranslate(pivot.fX + translate.fX, pivot.fY + translate.fY); |
| canvas->setMatrix(persp); |
| zPlaneParams = SkPoint3::Make(-SkScalarSin(radians), |
| 0, |
| SkTMax(1.0f, 32 + fZDelta) + SkScalarSin(radians)*pivot.fX); |
| this->drawShadowedPath(canvas, fWideOvalPath, zPlaneParams, paint, .1f, |
| lightPos, kLightWidth, .5f); |
| } |
| |
| bool onAnimate(const SkAnimTimer& timer) override { |
| fAnimTranslate = timer.pingPong(30, 0, 200, -200); |
| fAnimAngle = timer.pingPong(15, 0, 0, 20); |
| |
| return true; |
| } |
| |
| private: |
| typedef SampleView INHERITED; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////////// |
| |
| static SkView* MyFactory() { return new ShadowsView; } |
| static SkViewRegister reg(MyFactory); |
