| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef COBALT_MATH_QUAD_F_H_ |
| #define COBALT_MATH_QUAD_F_H_ |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <iosfwd> |
| #include <string> |
| |
| #include "cobalt/math/matrix3_f.h" |
| #include "cobalt/math/point_f.h" |
| #include "cobalt/math/rect_f.h" |
| |
| namespace cobalt { |
| namespace math { |
| |
| // A Quad is defined by four corners, allowing it to have edges that are not |
| // axis-aligned, unlike a Rect. |
| class QuadF { |
| public: |
| QuadF() {} |
| QuadF(const PointF& p1, const PointF& p2, const PointF& p3, const PointF& p4) |
| : p1_(p1), p2_(p2), p3_(p3), p4_(p4) {} |
| |
| // Creates a quad by multiplying the corner points of the given rectangle by |
| // the given matrix. |
| QuadF(const Matrix3F& matrix, const RectF& rect) |
| : p1_(matrix * PointF(rect.x(), rect.y())), |
| p2_(matrix * PointF(rect.right(), rect.y())), |
| p3_(matrix * PointF(rect.right(), rect.bottom())), |
| p4_(matrix * PointF(rect.x(), rect.bottom())) {} |
| |
| explicit QuadF(const RectF& rect) |
| : p1_(rect.x(), rect.y()), |
| p2_(rect.right(), rect.y()), |
| p3_(rect.right(), rect.bottom()), |
| p4_(rect.x(), rect.bottom()) {} |
| |
| void operator=(const RectF& rect); |
| |
| void SetQuad(const PointF& p1, const PointF& p2, const PointF& p3, |
| const PointF& p4) { |
| set_p1(p1); |
| set_p2(p2); |
| set_p3(p3); |
| set_p4(p4); |
| } |
| |
| void set_p1(const PointF& p) { p1_ = p; } |
| void set_p2(const PointF& p) { p2_ = p; } |
| void set_p3(const PointF& p) { p3_ = p; } |
| void set_p4(const PointF& p) { p4_ = p; } |
| |
| const PointF& p1() const { return p1_; } |
| const PointF& p2() const { return p2_; } |
| const PointF& p3() const { return p3_; } |
| const PointF& p4() const { return p4_; } |
| |
| // Returns true if the quad is an axis-aligned rectangle. |
| bool IsRectilinear() const; |
| |
| // Returns true if the points of the quad are in counter-clockwise order. This |
| // assumes that the quad is convex, and that no three points are collinear. |
| bool IsCounterClockwise() const; |
| |
| // Returns true if the |point| is contained within the quad, or lies on on |
| // edge of the quad. This assumes that the quad is convex. |
| bool Contains(const PointF& point) const; |
| |
| // Returns a rectangle that bounds the four points of the quad. The points of |
| // the quad may lie on the right/bottom edge of the resulting rectangle, |
| // rather than being strictly inside it. |
| RectF BoundingBox() const { |
| float rl = std::min(std::min(p1_.x(), p2_.x()), std::min(p3_.x(), p4_.x())); |
| float rr = std::max(std::max(p1_.x(), p2_.x()), std::max(p3_.x(), p4_.x())); |
| float rt = std::min(std::min(p1_.y(), p2_.y()), std::min(p3_.y(), p4_.y())); |
| float rb = std::max(std::max(p1_.y(), p2_.y()), std::max(p3_.y(), p4_.y())); |
| return RectF(rl, rt, rr - rl, rb - rt); |
| } |
| |
| // Add a vector to the quad, offseting each point in the quad by the vector. |
| void operator+=(const Vector2dF& rhs); |
| // Subtract a vector from the quad, offseting each point in the quad by the |
| // inverse of the vector. |
| void operator-=(const Vector2dF& rhs); |
| |
| // Scale each point in the quad by the |scale| factor. |
| void Scale(float scale) { Scale(scale, scale); } |
| |
| // Scale each point in the quad by the scale factors along each axis. |
| void Scale(float x_scale, float y_scale); |
| |
| // Returns a string representation of quad. |
| std::string ToString() const; |
| |
| private: |
| PointF p1_; |
| PointF p2_; |
| PointF p3_; |
| PointF p4_; |
| }; |
| |
| inline bool operator==(const QuadF& lhs, const QuadF& rhs) { |
| return lhs.p1() == rhs.p1() && lhs.p2() == rhs.p2() && lhs.p3() == rhs.p3() && |
| lhs.p4() == rhs.p4(); |
| } |
| |
| inline bool operator!=(const QuadF& lhs, const QuadF& rhs) { |
| return !(lhs == rhs); |
| } |
| |
| // Add a vector to a quad, offseting each point in the quad by the vector. |
| QuadF operator+(const QuadF& lhs, const Vector2dF& rhs); |
| // Subtract a vector from a quad, offseting each point in the quad by the |
| // inverse of the vector. |
| QuadF operator-(const QuadF& lhs, const Vector2dF& rhs); |
| |
| } // namespace math |
| } // namespace cobalt |
| |
| #endif // COBALT_MATH_QUAD_F_H_ |