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// 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_
#pragma once
#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_
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