1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef UI_GFX_GEOMETRY_QUAD_F_H_ 6 #define UI_GFX_GEOMETRY_QUAD_F_H_ 7 8 #include <algorithm> 9 #include <cmath> 10 #include <string> 11 12 #include "ui/gfx/geometry/point_f.h" 13 #include "ui/gfx/geometry/rect_f.h" 14 #include "ui/gfx/gfx_export.h" 15 16 namespace gfx { 17 18 // A Quad is defined by four corners, allowing it to have edges that are not 19 // axis-aligned, unlike a Rect. 20 class GFX_EXPORT QuadF { 21 public: 22 QuadF() {} 23 QuadF(const PointF& p1, const PointF& p2, const PointF& p3, const PointF& p4) 24 : p1_(p1), 25 p2_(p2), 26 p3_(p3), 27 p4_(p4) {} 28 29 explicit QuadF(const RectF& rect) 30 : p1_(rect.x(), rect.y()), 31 p2_(rect.right(), rect.y()), 32 p3_(rect.right(), rect.bottom()), 33 p4_(rect.x(), rect.bottom()) {} 34 35 void operator=(const RectF& rect); 36 37 void set_p1(const PointF& p) { p1_ = p; } 38 void set_p2(const PointF& p) { p2_ = p; } 39 void set_p3(const PointF& p) { p3_ = p; } 40 void set_p4(const PointF& p) { p4_ = p; } 41 42 const PointF& p1() const { return p1_; } 43 const PointF& p2() const { return p2_; } 44 const PointF& p3() const { return p3_; } 45 const PointF& p4() const { return p4_; } 46 47 // Returns true if the quad is an axis-aligned rectangle. 48 bool IsRectilinear() const; 49 50 // Returns true if the points of the quad are in counter-clockwise order. This 51 // assumes that the quad is convex, and that no three points are collinear. 52 bool IsCounterClockwise() const; 53 54 // Returns true if the |point| is contained within the quad, or lies on on 55 // edge of the quad. This assumes that the quad is convex. 56 bool Contains(const gfx::PointF& point) const; 57 58 // Returns a rectangle that bounds the four points of the quad. The points of 59 // the quad may lie on the right/bottom edge of the resulting rectangle, 60 // rather than being strictly inside it. 61 RectF BoundingBox() const { 62 float rl = std::min(std::min(p1_.x(), p2_.x()), std::min(p3_.x(), p4_.x())); 63 float rr = std::max(std::max(p1_.x(), p2_.x()), std::max(p3_.x(), p4_.x())); 64 float rt = std::min(std::min(p1_.y(), p2_.y()), std::min(p3_.y(), p4_.y())); 65 float rb = std::max(std::max(p1_.y(), p2_.y()), std::max(p3_.y(), p4_.y())); 66 return RectF(rl, rt, rr - rl, rb - rt); 67 } 68 69 // Add a vector to the quad, offseting each point in the quad by the vector. 70 void operator+=(const Vector2dF& rhs); 71 // Subtract a vector from the quad, offseting each point in the quad by the 72 // inverse of the vector. 73 void operator-=(const Vector2dF& rhs); 74 75 // Scale each point in the quad by the |scale| factor. 76 void Scale(float scale) { Scale(scale, scale); } 77 78 // Scale each point in the quad by the scale factors along each axis. 79 void Scale(float x_scale, float y_scale); 80 81 // Returns a string representation of quad. 82 std::string ToString() const; 83 84 private: 85 PointF p1_; 86 PointF p2_; 87 PointF p3_; 88 PointF p4_; 89 }; 90 91 inline bool operator==(const QuadF& lhs, const QuadF& rhs) { 92 return 93 lhs.p1() == rhs.p1() && lhs.p2() == rhs.p2() && 94 lhs.p3() == rhs.p3() && lhs.p4() == rhs.p4(); 95 } 96 97 inline bool operator!=(const QuadF& lhs, const QuadF& rhs) { 98 return !(lhs == rhs); 99 } 100 101 // Add a vector to a quad, offseting each point in the quad by the vector. 102 GFX_EXPORT QuadF operator+(const QuadF& lhs, const Vector2dF& rhs); 103 // Subtract a vector from a quad, offseting each point in the quad by the 104 // inverse of the vector. 105 GFX_EXPORT QuadF operator-(const QuadF& lhs, const Vector2dF& rhs); 106 107 } // namespace gfx 108 109 #endif // UI_GFX_GEOMETRY_QUAD_F_H_ 110
