flutter_flutter/sky/engine/platform/geometry/IntPoint.h

/*
 * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
 * Copyright (C) 2013 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer.
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 *    documentation and/or other materials provided with the distribution.
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#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_INTPOINT_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_INTPOINT_H_

#include "flutter/sky/engine/platform/geometry/IntSize.h"
#include "flutter/sky/engine/wtf/MathExtras.h"
#include "flutter/sky/engine/wtf/VectorTraits.h"

namespace blink {

class PLATFORM_EXPORT IntPoint {
 public:
  IntPoint() : m_x(0), m_y(0) {}
  IntPoint(int x, int y) : m_x(x), m_y(y) {}
  explicit IntPoint(const IntSize& size)
      : m_x(size.width()), m_y(size.height()) {}

  static IntPoint zero() { return IntPoint(); }

  int x() const { return m_x; }
  int y() const { return m_y; }

  void setX(int x) { m_x = x; }
  void setY(int y) { m_y = y; }

  void move(const IntSize& s) { move(s.width(), s.height()); }
  void moveBy(const IntPoint& offset) { move(offset.x(), offset.y()); }
  void move(int dx, int dy) {
    m_x += dx;
    m_y += dy;
  }
  void scale(float sx, float sy) {
    m_x = lroundf(static_cast<float>(m_x * sx));
    m_y = lroundf(static_cast<float>(m_y * sy));
  }

  IntPoint expandedTo(const IntPoint& other) const {
    return IntPoint(m_x > other.m_x ? m_x : other.m_x,
                    m_y > other.m_y ? m_y : other.m_y);
  }

  IntPoint shrunkTo(const IntPoint& other) const {
    return IntPoint(m_x < other.m_x ? m_x : other.m_x,
                    m_y < other.m_y ? m_y : other.m_y);
  }

  int distanceSquaredToPoint(const IntPoint&) const;

  void clampNegativeToZero() { *this = expandedTo(zero()); }

  IntPoint transposedPoint() const { return IntPoint(m_y, m_x); }

 private:
  int m_x, m_y;
};

inline IntPoint& operator+=(IntPoint& a, const IntSize& b) {
  a.move(b.width(), b.height());
  return a;
}

inline IntPoint& operator-=(IntPoint& a, const IntSize& b) {
  a.move(-b.width(), -b.height());
  return a;
}

inline IntPoint operator+(const IntPoint& a, const IntSize& b) {
  return IntPoint(a.x() + b.width(), a.y() + b.height());
}

inline IntPoint operator+(const IntPoint& a, const IntPoint& b) {
  return IntPoint(a.x() + b.x(), a.y() + b.y());
}

inline IntSize operator-(const IntPoint& a, const IntPoint& b) {
  return IntSize(a.x() - b.x(), a.y() - b.y());
}

inline IntPoint operator-(const IntPoint& a, const IntSize& b) {
  return IntPoint(a.x() - b.width(), a.y() - b.height());
}

inline IntPoint operator-(const IntPoint& point) {
  return IntPoint(-point.x(), -point.y());
}

inline bool operator==(const IntPoint& a, const IntPoint& b) {
  return a.x() == b.x() && a.y() == b.y();
}

inline bool operator!=(const IntPoint& a, const IntPoint& b) {
  return a.x() != b.x() || a.y() != b.y();
}

inline IntSize toIntSize(const IntPoint& a) {
  return IntSize(a.x(), a.y());
}

inline int IntPoint::distanceSquaredToPoint(const IntPoint& point) const {
  return ((*this) - point).diagonalLengthSquared();
}

}  // namespace blink

WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::IntPoint);

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_INTPOINT_H_