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      1 /*
      2  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
      3  * Copyright (C) 2013 Google Inc. All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  *
     14  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     15  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     17  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     18  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     19  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     20  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     21  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     22  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #ifndef IntPoint_h
     28 #define IntPoint_h
     29 
     30 #include "platform/geometry/IntSize.h"
     31 #include "wtf/MathExtras.h"
     32 #include "wtf/VectorTraits.h"
     33 
     34 #if OS(MACOSX)
     35 typedef struct CGPoint CGPoint;
     36 
     37 #ifdef __OBJC__
     38 #import <Foundation/Foundation.h>
     39 #endif
     40 #endif
     41 
     42 namespace blink {
     43 
     44 class PLATFORM_EXPORT IntPoint {
     45 public:
     46     IntPoint() : m_x(0), m_y(0) { }
     47     IntPoint(int x, int y) : m_x(x), m_y(y) { }
     48     explicit IntPoint(const IntSize& size) : m_x(size.width()), m_y(size.height()) { }
     49 
     50     static IntPoint zero() { return IntPoint(); }
     51 
     52     int x() const { return m_x; }
     53     int y() const { return m_y; }
     54 
     55     void setX(int x) { m_x = x; }
     56     void setY(int y) { m_y = y; }
     57 
     58     void move(const IntSize& s) { move(s.width(), s.height()); }
     59     void moveBy(const IntPoint& offset) { move(offset.x(), offset.y()); }
     60     void move(int dx, int dy) { m_x += dx; m_y += dy; }
     61     void scale(float sx, float sy)
     62     {
     63         m_x = lroundf(static_cast<float>(m_x * sx));
     64         m_y = lroundf(static_cast<float>(m_y * sy));
     65     }
     66 
     67     IntPoint expandedTo(const IntPoint& other) const
     68     {
     69         return IntPoint(m_x > other.m_x ? m_x : other.m_x,
     70             m_y > other.m_y ? m_y : other.m_y);
     71     }
     72 
     73     IntPoint shrunkTo(const IntPoint& other) const
     74     {
     75         return IntPoint(m_x < other.m_x ? m_x : other.m_x,
     76             m_y < other.m_y ? m_y : other.m_y);
     77     }
     78 
     79     int distanceSquaredToPoint(const IntPoint&) const;
     80 
     81     void clampNegativeToZero()
     82     {
     83         *this = expandedTo(zero());
     84     }
     85 
     86     IntPoint transposedPoint() const
     87     {
     88         return IntPoint(m_y, m_x);
     89     }
     90 
     91 #if OS(MACOSX)
     92     explicit IntPoint(const CGPoint&); // don't do this implicitly since it's lossy
     93     operator CGPoint() const;
     94 
     95 #if defined(__OBJC__) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
     96     explicit IntPoint(const NSPoint&); // don't do this implicitly since it's lossy
     97     operator NSPoint() const;
     98 #endif
     99 #endif
    100 
    101 private:
    102     int m_x, m_y;
    103 };
    104 
    105 inline IntPoint& operator+=(IntPoint& a, const IntSize& b)
    106 {
    107     a.move(b.width(), b.height());
    108     return a;
    109 }
    110 
    111 inline IntPoint& operator-=(IntPoint& a, const IntSize& b)
    112 {
    113     a.move(-b.width(), -b.height());
    114     return a;
    115 }
    116 
    117 inline IntPoint operator+(const IntPoint& a, const IntSize& b)
    118 {
    119     return IntPoint(a.x() + b.width(), a.y() + b.height());
    120 }
    121 
    122 inline IntPoint operator+(const IntPoint& a, const IntPoint& b)
    123 {
    124     return IntPoint(a.x() + b.x(), a.y() + b.y());
    125 }
    126 
    127 inline IntSize operator-(const IntPoint& a, const IntPoint& b)
    128 {
    129     return IntSize(a.x() - b.x(), a.y() - b.y());
    130 }
    131 
    132 inline IntPoint operator-(const IntPoint& a, const IntSize& b)
    133 {
    134     return IntPoint(a.x() - b.width(), a.y() - b.height());
    135 }
    136 
    137 inline IntPoint operator-(const IntPoint& point)
    138 {
    139     return IntPoint(-point.x(), -point.y());
    140 }
    141 
    142 inline bool operator==(const IntPoint& a, const IntPoint& b)
    143 {
    144     return a.x() == b.x() && a.y() == b.y();
    145 }
    146 
    147 inline bool operator!=(const IntPoint& a, const IntPoint& b)
    148 {
    149     return a.x() != b.x() || a.y() != b.y();
    150 }
    151 
    152 inline IntSize toIntSize(const IntPoint& a)
    153 {
    154     return IntSize(a.x(), a.y());
    155 }
    156 
    157 inline int IntPoint::distanceSquaredToPoint(const IntPoint& point) const
    158 {
    159     return ((*this) - point).diagonalLengthSquared();
    160 }
    161 
    162 } // namespace blink
    163 
    164 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::IntPoint);
    165 
    166 #endif // IntPoint_h
    167