1 /*
2 * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
3 * Copyright (C) 2005 Nokia. 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 FloatPoint_h
28 #define FloatPoint_h
29
30 #include "platform/geometry/FloatSize.h"
31 #include "platform/geometry/IntPoint.h"
32 #include "wtf/MathExtras.h"
33 #include <algorithm>
34
35 #if OS(MACOSX)
36 typedef struct CGPoint CGPoint;
37
38 #ifdef __OBJC__
39 #import <Foundation/Foundation.h>
40 #endif
41 #endif
42
43 struct SkPoint;
44
45 namespace WebCore {
46
47 class IntPoint;
48 class IntSize;
49 class LayoutPoint;
50 class LayoutSize;
51
52 class PLATFORM_EXPORT FloatPoint {
53 public:
FloatPoint()54 FloatPoint() : m_x(0), m_y(0) { }
FloatPoint(float x,float y)55 FloatPoint(float x, float y) : m_x(x), m_y(y) { }
56 FloatPoint(const IntPoint&);
57 FloatPoint(const LayoutPoint&);
FloatPoint(const FloatSize & size)58 explicit FloatPoint(const FloatSize& size) : m_x(size.width()), m_y(size.height()) { }
59
zero()60 static FloatPoint zero() { return FloatPoint(); }
61
62 static FloatPoint narrowPrecision(double x, double y);
63
x()64 float x() const { return m_x; }
y()65 float y() const { return m_y; }
66
setX(float x)67 void setX(float x) { m_x = x; }
setY(float y)68 void setY(float y) { m_y = y; }
set(float x,float y)69 void set(float x, float y)
70 {
71 m_x = x;
72 m_y = y;
73 }
move(float dx,float dy)74 void move(float dx, float dy)
75 {
76 m_x += dx;
77 m_y += dy;
78 }
move(const IntSize & a)79 void move(const IntSize& a)
80 {
81 m_x += a.width();
82 m_y += a.height();
83 }
84 void move(const LayoutSize&);
move(const FloatSize & a)85 void move(const FloatSize& a)
86 {
87 m_x += a.width();
88 m_y += a.height();
89 }
moveBy(const IntPoint & a)90 void moveBy(const IntPoint& a)
91 {
92 m_x += a.x();
93 m_y += a.y();
94 }
95 void moveBy(const LayoutPoint&);
moveBy(const FloatPoint & a)96 void moveBy(const FloatPoint& a)
97 {
98 m_x += a.x();
99 m_y += a.y();
100 }
scale(float sx,float sy)101 void scale(float sx, float sy)
102 {
103 m_x *= sx;
104 m_y *= sy;
105 }
106
107 void normalize();
108
dot(const FloatPoint & a)109 float dot(const FloatPoint& a) const
110 {
111 return m_x * a.x() + m_y * a.y();
112 }
113
114 float slopeAngleRadians() const;
115 float length() const;
lengthSquared()116 float lengthSquared() const
117 {
118 return m_x * m_x + m_y * m_y;
119 }
120
expandedTo(const FloatPoint & other)121 FloatPoint expandedTo(const FloatPoint& other) const
122 {
123 return FloatPoint(std::max(m_x, other.m_x), std::max(m_y, other.m_y));
124 }
125
shrunkTo(const FloatPoint & other)126 FloatPoint shrunkTo(const FloatPoint& other) const
127 {
128 return FloatPoint(std::min(m_x, other.m_x), std::min(m_y, other.m_y));
129 }
130
transposedPoint()131 FloatPoint transposedPoint() const
132 {
133 return FloatPoint(m_y, m_x);
134 }
135
scaledBy(float scale)136 FloatPoint scaledBy(float scale) const
137 {
138 return FloatPoint(m_x * scale, m_y * scale);
139 }
140
141 #if OS(MACOSX)
142 FloatPoint(const CGPoint&);
143 operator CGPoint() const;
144 #if defined(__OBJC__) && !defined(NSGEOMETRY_TYPES_SAME_AS_CGGEOMETRY_TYPES)
145 FloatPoint(const NSPoint&);
146 operator NSPoint() const;
147 #endif
148 #endif
149
150 SkPoint data() const;
151
152 private:
153 float m_x, m_y;
154 };
155
156
157 inline FloatPoint& operator+=(FloatPoint& a, const FloatSize& b)
158 {
159 a.move(b.width(), b.height());
160 return a;
161 }
162
163 inline FloatPoint& operator+=(FloatPoint& a, const FloatPoint& b)
164 {
165 a.move(b.x(), b.y());
166 return a;
167 }
168
169 inline FloatPoint& operator-=(FloatPoint& a, const FloatSize& b)
170 {
171 a.move(-b.width(), -b.height());
172 return a;
173 }
174
175 inline FloatPoint operator+(const FloatPoint& a, const FloatSize& b)
176 {
177 return FloatPoint(a.x() + b.width(), a.y() + b.height());
178 }
179
180 inline FloatPoint operator+(const FloatPoint& a, const FloatPoint& b)
181 {
182 return FloatPoint(a.x() + b.x(), a.y() + b.y());
183 }
184
185 inline FloatSize operator-(const FloatPoint& a, const FloatPoint& b)
186 {
187 return FloatSize(a.x() - b.x(), a.y() - b.y());
188 }
189
190 inline FloatPoint operator-(const FloatPoint& a, const FloatSize& b)
191 {
192 return FloatPoint(a.x() - b.width(), a.y() - b.height());
193 }
194
195 inline FloatPoint operator-(const FloatPoint& a)
196 {
197 return FloatPoint(-a.x(), -a.y());
198 }
199
200 inline bool operator==(const FloatPoint& a, const FloatPoint& b)
201 {
202 return a.x() == b.x() && a.y() == b.y();
203 }
204
205 inline bool operator!=(const FloatPoint& a, const FloatPoint& b)
206 {
207 return a.x() != b.x() || a.y() != b.y();
208 }
209
210 inline float operator*(const FloatPoint& a, const FloatPoint& b)
211 {
212 // dot product
213 return a.dot(b);
214 }
215
roundedIntPoint(const FloatPoint & p)216 inline IntPoint roundedIntPoint(const FloatPoint& p)
217 {
218 return IntPoint(clampToInteger(roundf(p.x())), clampToInteger(roundf(p.y())));
219 }
220
flooredIntPoint(const FloatPoint & p)221 inline IntPoint flooredIntPoint(const FloatPoint& p)
222 {
223 return IntPoint(clampToInteger(floorf(p.x())), clampToInteger(floorf(p.y())));
224 }
225
ceiledIntPoint(const FloatPoint & p)226 inline IntPoint ceiledIntPoint(const FloatPoint& p)
227 {
228 return IntPoint(clampToInteger(ceilf(p.x())), clampToInteger(ceilf(p.y())));
229 }
230
flooredIntSize(const FloatPoint & p)231 inline IntSize flooredIntSize(const FloatPoint& p)
232 {
233 return IntSize(clampToInteger(floorf(p.x())), clampToInteger(floorf(p.y())));
234 }
235
toFloatSize(const FloatPoint & a)236 inline FloatSize toFloatSize(const FloatPoint& a)
237 {
238 return FloatSize(a.x(), a.y());
239 }
240
241 PLATFORM_EXPORT float findSlope(const FloatPoint& p1, const FloatPoint& p2, float& c);
242
243 // Find point where lines through the two pairs of points intersect. Returns false if the lines don't intersect.
244 PLATFORM_EXPORT bool findIntersection(const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& d1, const FloatPoint& d2, FloatPoint& intersection);
245
246 }
247
248 #endif
249