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

/*
 * Copyright (C) 2004, 2006, 2007 Apple Inc.  All rights reserved.
 * Copyright (C) 2005 Nokia.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_FLOATPOINT_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_FLOATPOINT_H_

#include <algorithm>
#include "flutter/sky/engine/platform/geometry/FloatSize.h"
#include "flutter/sky/engine/platform/geometry/IntPoint.h"
#include "flutter/sky/engine/wtf/MathExtras.h"

struct SkPoint;

namespace blink {

class IntPoint;
class IntSize;
class LayoutPoint;
class LayoutSize;

class PLATFORM_EXPORT FloatPoint {
 public:
  FloatPoint() : m_x(0), m_y(0) {}
  FloatPoint(float x, float y) : m_x(x), m_y(y) {}
  FloatPoint(const IntPoint&);
  FloatPoint(const LayoutPoint&);
  explicit FloatPoint(const FloatSize& size)
      : m_x(size.width()), m_y(size.height()) {}

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

  static FloatPoint narrowPrecision(double x, double y);

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

  void setX(float x) { m_x = x; }
  void setY(float y) { m_y = y; }
  void set(float x, float y) {
    m_x = x;
    m_y = y;
  }
  void move(float dx, float dy) {
    m_x += dx;
    m_y += dy;
  }
  void move(const IntSize& a) {
    m_x += a.width();
    m_y += a.height();
  }
  void move(const LayoutSize&);
  void move(const FloatSize& a) {
    m_x += a.width();
    m_y += a.height();
  }
  void moveBy(const IntPoint& a) {
    m_x += a.x();
    m_y += a.y();
  }
  void moveBy(const LayoutPoint&);
  void moveBy(const FloatPoint& a) {
    m_x += a.x();
    m_y += a.y();
  }
  void scale(float sx, float sy) {
    m_x *= sx;
    m_y *= sy;
  }

  void normalize();

  float dot(const FloatPoint& a) const { return m_x * a.x() + m_y * a.y(); }

  float slopeAngleRadians() const;
  float length() const;
  float lengthSquared() const { return m_x * m_x + m_y * m_y; }

  FloatPoint expandedTo(const FloatPoint& other) const {
    return FloatPoint(std::max(m_x, other.m_x), std::max(m_y, other.m_y));
  }

  FloatPoint shrunkTo(const FloatPoint& other) const {
    return FloatPoint(std::min(m_x, other.m_x), std::min(m_y, other.m_y));
  }

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

  FloatPoint scaledBy(float scale) const {
    return FloatPoint(m_x * scale, m_y * scale);
  }

  SkPoint data() const;

 private:
  float m_x, m_y;
};

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

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

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

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

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

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

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

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

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

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

inline float operator*(const FloatPoint& a, const FloatPoint& b) {
  // dot product
  return a.dot(b);
}

inline IntPoint roundedIntPoint(const FloatPoint& p) {
  return IntPoint(clampToInteger(roundf(p.x())), clampToInteger(roundf(p.y())));
}

inline IntPoint flooredIntPoint(const FloatPoint& p) {
  return IntPoint(clampToInteger(floorf(p.x())), clampToInteger(floorf(p.y())));
}

inline IntPoint ceiledIntPoint(const FloatPoint& p) {
  return IntPoint(clampToInteger(ceilf(p.x())), clampToInteger(ceilf(p.y())));
}

inline IntSize flooredIntSize(const FloatPoint& p) {
  return IntSize(clampToInteger(floorf(p.x())), clampToInteger(floorf(p.y())));
}

inline FloatSize toFloatSize(const FloatPoint& a) {
  return FloatSize(a.x(), a.y());
}

PLATFORM_EXPORT float findSlope(const FloatPoint& p1,
                                const FloatPoint& p2,
                                float& c);

// Find point where lines through the two pairs of points intersect. Returns
// false if the lines don't intersect.
PLATFORM_EXPORT bool findIntersection(const FloatPoint& p1,
                                      const FloatPoint& p2,
                                      const FloatPoint& d1,
                                      const FloatPoint& d2,
                                      FloatPoint& intersection);

}  // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_FLOATPOINT_H_