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| 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_POINT_BASE_H_ | |
| 6 #define UI_GFX_POINT_BASE_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/compiler_specific.h" | |
| 11 #include "build/build_config.h" | |
| 12 #include "ui/gfx/gfx_export.h" | |
| 13 | |
| 14 namespace gfx { | |
| 15 | |
| 16 // A point has an x and y coordinate. | |
| 17 template<typename Class, typename Type, typename VectorClass> | |
| 18 class GFX_EXPORT PointBase { | |
| 19 public: | |
| 20 Type x() const { return x_; } | |
| 21 Type y() const { return y_; } | |
| 22 | |
| 23 void SetPoint(Type x, Type y) { | |
| 24 x_ = x; | |
| 25 y_ = y; | |
| 26 } | |
| 27 | |
| 28 void set_x(Type x) { x_ = x; } | |
| 29 void set_y(Type y) { y_ = y; } | |
| 30 | |
| 31 void Offset(Type delta_x, Type delta_y) { | |
| 32 x_ += delta_x; | |
| 33 y_ += delta_y; | |
| 34 } | |
| 35 | |
| 36 void operator+=(const VectorClass& vector) { | |
| 37 x_ += vector.x(); | |
| 38 y_ += vector.y(); | |
| 39 } | |
| 40 | |
| 41 void operator-=(const VectorClass& vector) { | |
| 42 x_ -= vector.x(); | |
| 43 y_ -= vector.y(); | |
| 44 } | |
| 45 | |
| 46 void SetToMin(const Class& other) { | |
| 47 x_ = x_ <= other.x_ ? x_ : other.x_; | |
| 48 y_ = y_ <= other.y_ ? y_ : other.y_; | |
| 49 } | |
| 50 | |
| 51 void SetToMax(const Class& other) { | |
| 52 x_ = x_ >= other.x_ ? x_ : other.x_; | |
| 53 y_ = y_ >= other.y_ ? y_ : other.y_; | |
| 54 } | |
| 55 | |
| 56 bool IsOrigin() const { | |
| 57 return x_ == 0 && y_ == 0; | |
| 58 } | |
| 59 | |
| 60 VectorClass OffsetFromOrigin() const { | |
| 61 return VectorClass(x_, y_); | |
| 62 } | |
| 63 | |
| 64 // A point is less than another point if its y-value is closer | |
| 65 // to the origin. If the y-values are the same, then point with | |
| 66 // the x-value closer to the origin is considered less than the | |
| 67 // other. | |
| 68 // This comparison is required to use Point in sets, or sorted | |
| 69 // vectors. | |
| 70 bool operator<(const Class& rhs) const { | |
| 71 return (y_ == rhs.y_) ? (x_ < rhs.x_) : (y_ < rhs.y_); | |
| 72 } | |
| 73 | |
| 74 protected: | |
| 75 PointBase(Type x, Type y) : x_(x), y_(y) {} | |
| 76 // Destructor is intentionally made non virtual and protected. | |
| 77 // Do not make this public. | |
| 78 ~PointBase() {} | |
| 79 | |
| 80 private: | |
| 81 Type x_; | |
| 82 Type y_; | |
| 83 }; | |
| 84 | |
| 85 } // namespace gfx | |
| 86 | |
| 87 #endif // UI_GFX_POINT_BASE_H_ | |
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