ben@chromium.org | 8e7c15d | 2013-12-19 06:01:15 +0900 | [diff] [blame] | 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> |
jamesr@chromium.org | 16cdf9c | 2014-07-10 16:41:43 +0900 | [diff] [blame] | 10 | #include <iosfwd> |
ben@chromium.org | 8e7c15d | 2013-12-19 06:01:15 +0900 | [diff] [blame] | 11 | #include <string> |
| 12 | |
awoloszyn | de63452 | 2015-03-12 23:38:32 +0900 | [diff] [blame] | 13 | #include "base/logging.h" |
ben@chromium.org | 8e7c15d | 2013-12-19 06:01:15 +0900 | [diff] [blame] | 14 | #include "ui/gfx/geometry/point_f.h" |
| 15 | #include "ui/gfx/geometry/rect_f.h" |
| 16 | #include "ui/gfx/gfx_export.h" |
| 17 | |
| 18 | namespace gfx { |
| 19 | |
| 20 | // A Quad is defined by four corners, allowing it to have edges that are not |
| 21 | // axis-aligned, unlike a Rect. |
| 22 | class GFX_EXPORT QuadF { |
| 23 | public: |
| 24 | QuadF() {} |
| 25 | QuadF(const PointF& p1, const PointF& p2, const PointF& p3, const PointF& p4) |
| 26 | : p1_(p1), |
| 27 | p2_(p2), |
| 28 | p3_(p3), |
| 29 | p4_(p4) {} |
| 30 | |
| 31 | explicit QuadF(const RectF& rect) |
| 32 | : p1_(rect.x(), rect.y()), |
| 33 | p2_(rect.right(), rect.y()), |
| 34 | p3_(rect.right(), rect.bottom()), |
| 35 | p4_(rect.x(), rect.bottom()) {} |
| 36 | |
| 37 | void operator=(const RectF& rect); |
| 38 | |
| 39 | void set_p1(const PointF& p) { p1_ = p; } |
| 40 | void set_p2(const PointF& p) { p2_ = p; } |
| 41 | void set_p3(const PointF& p) { p3_ = p; } |
| 42 | void set_p4(const PointF& p) { p4_ = p; } |
| 43 | |
| 44 | const PointF& p1() const { return p1_; } |
| 45 | const PointF& p2() const { return p2_; } |
| 46 | const PointF& p3() const { return p3_; } |
| 47 | const PointF& p4() const { return p4_; } |
| 48 | |
| 49 | // Returns true if the quad is an axis-aligned rectangle. |
| 50 | bool IsRectilinear() const; |
| 51 | |
| 52 | // Returns true if the points of the quad are in counter-clockwise order. This |
| 53 | // assumes that the quad is convex, and that no three points are collinear. |
| 54 | bool IsCounterClockwise() const; |
| 55 | |
| 56 | // Returns true if the |point| is contained within the quad, or lies on on |
jdduke@chromium.org | a55f8c0 | 2014-05-17 05:13:54 +0900 | [diff] [blame] | 57 | // edge of the quad. This assumes that the quad is convex. |
ben@chromium.org | 8e7c15d | 2013-12-19 06:01:15 +0900 | [diff] [blame] | 58 | bool Contains(const gfx::PointF& point) const; |
| 59 | |
| 60 | // Returns a rectangle that bounds the four points of the quad. The points of |
| 61 | // the quad may lie on the right/bottom edge of the resulting rectangle, |
| 62 | // rather than being strictly inside it. |
| 63 | RectF BoundingBox() const { |
| 64 | float rl = std::min(std::min(p1_.x(), p2_.x()), std::min(p3_.x(), p4_.x())); |
| 65 | float rr = std::max(std::max(p1_.x(), p2_.x()), std::max(p3_.x(), p4_.x())); |
| 66 | float rt = std::min(std::min(p1_.y(), p2_.y()), std::min(p3_.y(), p4_.y())); |
| 67 | float rb = std::max(std::max(p1_.y(), p2_.y()), std::max(p3_.y(), p4_.y())); |
| 68 | return RectF(rl, rt, rr - rl, rb - rt); |
| 69 | } |
| 70 | |
awoloszyn | de63452 | 2015-03-12 23:38:32 +0900 | [diff] [blame] | 71 | // Realigns the corners in the quad by rotating them n corners to the right. |
| 72 | void Realign(size_t times) { |
| 73 | DCHECK_LE(times, 4u); |
| 74 | for (size_t i = 0; i < times; ++i) { |
| 75 | PointF temp = p1_; |
| 76 | p1_ = p2_; |
| 77 | p2_ = p3_; |
| 78 | p3_ = p4_; |
| 79 | p4_ = temp; |
| 80 | } |
| 81 | } |
| 82 | |
ben@chromium.org | 8e7c15d | 2013-12-19 06:01:15 +0900 | [diff] [blame] | 83 | // Add a vector to the quad, offseting each point in the quad by the vector. |
| 84 | void operator+=(const Vector2dF& rhs); |
| 85 | // Subtract a vector from the quad, offseting each point in the quad by the |
| 86 | // inverse of the vector. |
| 87 | void operator-=(const Vector2dF& rhs); |
| 88 | |
| 89 | // Scale each point in the quad by the |scale| factor. |
| 90 | void Scale(float scale) { Scale(scale, scale); } |
| 91 | |
| 92 | // Scale each point in the quad by the scale factors along each axis. |
| 93 | void Scale(float x_scale, float y_scale); |
| 94 | |
| 95 | // Returns a string representation of quad. |
| 96 | std::string ToString() const; |
| 97 | |
| 98 | private: |
| 99 | PointF p1_; |
| 100 | PointF p2_; |
| 101 | PointF p3_; |
| 102 | PointF p4_; |
| 103 | }; |
| 104 | |
| 105 | inline bool operator==(const QuadF& lhs, const QuadF& rhs) { |
| 106 | return |
| 107 | lhs.p1() == rhs.p1() && lhs.p2() == rhs.p2() && |
| 108 | lhs.p3() == rhs.p3() && lhs.p4() == rhs.p4(); |
| 109 | } |
| 110 | |
| 111 | inline bool operator!=(const QuadF& lhs, const QuadF& rhs) { |
| 112 | return !(lhs == rhs); |
| 113 | } |
| 114 | |
| 115 | // Add a vector to a quad, offseting each point in the quad by the vector. |
| 116 | GFX_EXPORT QuadF operator+(const QuadF& lhs, const Vector2dF& rhs); |
| 117 | // Subtract a vector from a quad, offseting each point in the quad by the |
| 118 | // inverse of the vector. |
| 119 | GFX_EXPORT QuadF operator-(const QuadF& lhs, const Vector2dF& rhs); |
| 120 | |
jamesr@chromium.org | 16cdf9c | 2014-07-10 16:41:43 +0900 | [diff] [blame] | 121 | // This is declared here for use in gtest-based unit tests but is defined in |
| 122 | // the gfx_test_support target. Depend on that to use this in your unit test. |
| 123 | // This should not be used in production code - call ToString() instead. |
| 124 | void PrintTo(const QuadF& quad, ::std::ostream* os); |
| 125 | |
ben@chromium.org | 8e7c15d | 2013-12-19 06:01:15 +0900 | [diff] [blame] | 126 | } // namespace gfx |
| 127 | |
| 128 | #endif // UI_GFX_GEOMETRY_QUAD_F_H_ |