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 <iosfwd> 11 #include <string> 12 13 #include "ui/gfx/geometry/point_f.h" 14 #include "ui/gfx/geometry/rect_f.h" 15 #include "ui/gfx/gfx_export.h" 16 17 namespace gfx { 18 19 // A Quad is defined by four corners, allowing it to have edges that are not 20 // axis-aligned, unlike a Rect. 21 class GFX_EXPORT QuadF { 22 public: 23 QuadF() {} 24 QuadF(const PointF& p1, const PointF& p2, const PointF& p3, const PointF& p4) 25 : p1_(p1), 26 p2_(p2), 27 p3_(p3), 28 p4_(p4) {} 29 30 explicit QuadF(const RectF& rect) 31 : p1_(rect.x(), rect.y()), 32 p2_(rect.right(), rect.y()), 33 p3_(rect.right(), rect.bottom()), 34 p4_(rect.x(), rect.bottom()) {} 35 36 void operator=(const RectF& rect); 37 38 void set_p1(const PointF& p) { p1_ = p; } 39 void set_p2(const PointF& p) { p2_ = p; } 40 void set_p3(const PointF& p) { p3_ = p; } 41 void set_p4(const PointF& p) { p4_ = p; } 42 43 const PointF& p1() const { return p1_; } 44 const PointF& p2() const { return p2_; } 45 const PointF& p3() const { return p3_; } 46 const PointF& p4() const { return p4_; } 47 48 // Returns true if the quad is an axis-aligned rectangle. 49 bool IsRectilinear() const; 50 51 // Returns true if the points of the quad are in counter-clockwise order. This 52 // assumes that the quad is convex, and that no three points are collinear. 53 bool IsCounterClockwise() const; 54 55 // Returns true if the |point| is contained within the quad, or lies on on 56 // edge of the quad. This assumes that the quad is convex. 57 bool Contains(const gfx::PointF& point) const; 58 59 // Returns a rectangle that bounds the four points of the quad. The points of 60 // the quad may lie on the right/bottom edge of the resulting rectangle, 61 // rather than being strictly inside it. 62 RectF BoundingBox() const { 63 float rl = std::min(std::min(p1_.x(), p2_.x()), std::min(p3_.x(), p4_.x())); 64 float rr = std::max(std::max(p1_.x(), p2_.x()), std::max(p3_.x(), p4_.x())); 65 float rt = std::min(std::min(p1_.y(), p2_.y()), std::min(p3_.y(), p4_.y())); 66 float rb = std::max(std::max(p1_.y(), p2_.y()), std::max(p3_.y(), p4_.y())); 67 return RectF(rl, rt, rr - rl, rb - rt); 68 } 69 70 // Add a vector to the quad, offseting each point in the quad by the vector. 71 void operator+=(const Vector2dF& rhs); 72 // Subtract a vector from the quad, offseting each point in the quad by the 73 // inverse of the vector. 74 void operator-=(const Vector2dF& rhs); 75 76 // Scale each point in the quad by the |scale| factor. 77 void Scale(float scale) { Scale(scale, scale); } 78 79 // Scale each point in the quad by the scale factors along each axis. 80 void Scale(float x_scale, float y_scale); 81 82 // Returns a string representation of quad. 83 std::string ToString() const; 84 85 private: 86 PointF p1_; 87 PointF p2_; 88 PointF p3_; 89 PointF p4_; 90 }; 91 92 inline bool operator==(const QuadF& lhs, const QuadF& rhs) { 93 return 94 lhs.p1() == rhs.p1() && lhs.p2() == rhs.p2() && 95 lhs.p3() == rhs.p3() && lhs.p4() == rhs.p4(); 96 } 97 98 inline bool operator!=(const QuadF& lhs, const QuadF& rhs) { 99 return !(lhs == rhs); 100 } 101 102 // Add a vector to a quad, offseting each point in the quad by the vector. 103 GFX_EXPORT QuadF operator+(const QuadF& lhs, const Vector2dF& rhs); 104 // Subtract a vector from a quad, offseting each point in the quad by the 105 // inverse of the vector. 106 GFX_EXPORT QuadF operator-(const QuadF& lhs, const Vector2dF& rhs); 107 108 // This is declared here for use in gtest-based unit tests but is defined in 109 // the gfx_test_support target. Depend on that to use this in your unit test. 110 // This should not be used in production code - call ToString() instead. 111 void PrintTo(const QuadF& quad, ::std::ostream* os); 112 113 } // namespace gfx 114 115 #endif // UI_GFX_GEOMETRY_QUAD_F_H_ 116
