| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef UI_GFX_POINT_BASE_H_ |
| #define UI_GFX_POINT_BASE_H_ |
| |
| #include <string> |
| |
| #include "build/build_config.h" |
| #include "ui/base/ui_export.h" |
| |
| namespace gfx { |
| |
| // A point has an x and y coordinate. |
| template<typename Class, typename Type> |
| class UI_EXPORT PointBase { |
| public: |
| Type x() const { return x_; } |
| Type y() const { return y_; } |
| |
| void SetPoint(Type x, Type y) { |
| x_ = x; |
| y_ = y; |
| } |
| |
| void set_x(Type x) { x_ = x; } |
| void set_y(Type y) { y_ = y; } |
| |
| void Offset(Type delta_x, Type delta_y) { |
| x_ += delta_x; |
| y_ += delta_y; |
| } |
| |
| Class Scale(float scale) const { |
| return Scale(scale, scale); |
| } |
| |
| Class Scale(float x_scale, float y_scale) const { |
| return Class(static_cast<Type>(x_ * x_scale), |
| static_cast<Type>(y_ * y_scale)); |
| } |
| |
| Class Add(const Class& other) const{ |
| const Class* orig = static_cast<const Class*>(this); |
| Class copy = *orig; |
| copy.Offset(other.x_, other.y_); |
| return copy; |
| } |
| |
| Class Subtract(const Class& other) const { |
| const Class* orig = static_cast<const Class*>(this); |
| Class copy = *orig; |
| copy.Offset(-other.x_, -other.y_); |
| return copy; |
| } |
| |
| Class Middle(const Class& other) const { |
| return Class((x_ + other.x_) / 2, (y_ + other.y_) / 2); |
| } |
| |
| bool operator==(const Class& rhs) const { |
| return x_ == rhs.x_ && y_ == rhs.y_; |
| } |
| |
| bool operator!=(const Class& rhs) const { |
| return !(*this == rhs); |
| } |
| |
| // A point is less than another point if its y-value is closer |
| // to the origin. If the y-values are the same, then point with |
| // the x-value closer to the origin is considered less than the |
| // other. |
| // This comparison is required to use Point in sets, or sorted |
| // vectors. |
| bool operator<(const Class& rhs) const { |
| return (y_ == rhs.y_) ? (x_ < rhs.x_) : (y_ < rhs.y_); |
| } |
| |
| protected: |
| PointBase(Type x, Type y) : x_(x), y_(y) {} |
| // Destructor is intentionally made non virtual and protected. |
| // Do not make this public. |
| ~PointBase() {} |
| |
| private: |
| Type x_; |
| Type y_; |
| }; |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_POINT_BASE_H_ |