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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 COBALT_MATH_POINT_BASE_H_
#define COBALT_MATH_POINT_BASE_H_
#include <string>
namespace cobalt {
namespace math {
// A point has an x and y coordinate.
template <typename Class, typename Type, typename VectorClass>
class 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;
}
void operator+=(const VectorClass& vector) {
x_ += vector.x();
y_ += vector.y();
}
void operator-=(const VectorClass& vector) {
x_ -= vector.x();
y_ -= vector.y();
}
void SetToMin(const Class& other) {
x_ = x_ <= other.x_ ? x_ : other.x_;
y_ = y_ <= other.y_ ? y_ : other.y_;
}
void SetToMax(const Class& other) {
x_ = x_ >= other.x_ ? x_ : other.x_;
y_ = y_ >= other.y_ ? y_ : other.y_;
}
bool IsOrigin() const { return x_ == Type(0) && y_ == Type(0); }
VectorClass OffsetFromOrigin() const { return VectorClass(x_, y_); }
// 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() {}
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 math
} // namespace cobalt
#endif // COBALT_MATH_POINT_BASE_H_