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_POINT_BASE_H_ 6 #define UI_GFX_GEOMETRY_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: x()20 Type x() const { return x_; } y()21 Type y() const { return y_; } 22 SetPoint(Type x,Type y)23 void SetPoint(Type x, Type y) { 24 x_ = x; 25 y_ = y; 26 } 27 set_x(Type x)28 void set_x(Type x) { x_ = x; } set_y(Type y)29 void set_y(Type y) { y_ = y; } 30 Offset(Type delta_x,Type delta_y)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 SetToMin(const Class & other)46 void SetToMin(const Class& other) { 47 x_ = x_ <= other.x_ ? x_ : other.x_; 48 y_ = y_ <= other.y_ ? y_ : other.y_; 49 } 50 SetToMax(const Class & other)51 void SetToMax(const Class& other) { 52 x_ = x_ >= other.x_ ? x_ : other.x_; 53 y_ = y_ >= other.y_ ? y_ : other.y_; 54 } 55 IsOrigin()56 bool IsOrigin() const { 57 return x_ == 0 && y_ == 0; 58 } 59 OffsetFromOrigin()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: PointBase(Type x,Type y)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. ~PointBase()78 ~PointBase() {} 79 80 private: 81 Type x_; 82 Type y_; 83 }; 84 85 } // namespace gfx 86 87 #endif // UI_GFX_GEOMETRY_POINT_BASE_H_ 88