2 * Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
3 * Copyright (C) 2005 Nokia. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
28 #include "platform/geometry/FloatPoint.h"
31 #include "platform/FloatConversion.h"
32 #include "platform/geometry/LayoutPoint.h"
33 #include "platform/geometry/LayoutSize.h"
39 // Skia has problems when passed infinite, etc floats, filter them to 0.
40 static inline SkScalar WebCoreFloatToSkScalar(float f)
42 return SkFloatToScalar(std::isfinite(f) ? f : 0);
45 FloatPoint::FloatPoint(const IntPoint& p) : m_x(p.x()), m_y(p.y())
49 FloatPoint::FloatPoint(const LayoutPoint& p)
50 : m_x(p.x().toFloat())
51 , m_y(p.y().toFloat())
55 void FloatPoint::normalize()
57 float tempLength = length();
65 float FloatPoint::slopeAngleRadians() const
67 return atan2f(m_y, m_x);
70 float FloatPoint::length() const
72 return sqrtf(lengthSquared());
75 void FloatPoint::move(const LayoutSize& size)
81 void FloatPoint::moveBy(const LayoutPoint& point)
87 SkPoint FloatPoint::data() const
89 SkPoint p = { WebCoreFloatToSkScalar(m_x), WebCoreFloatToSkScalar(m_y) };
93 FloatPoint FloatPoint::narrowPrecision(double x, double y)
95 return FloatPoint(narrowPrecisionToFloat(x), narrowPrecisionToFloat(y));
98 float findSlope(const FloatPoint& p1, const FloatPoint& p2, float& c)
100 if (p2.x() == p1.x())
101 return std::numeric_limits<float>::infinity();
104 float slope = (p2.y() - p1.y()) / (p2.x() - p1.x());
105 c = p1.y() - slope * p1.x();
109 bool findIntersection(const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& d1, const FloatPoint& d2, FloatPoint& intersection)
111 float pxLength = p2.x() - p1.x();
112 float pyLength = p2.y() - p1.y();
114 float dxLength = d2.x() - d1.x();
115 float dyLength = d2.y() - d1.y();
117 float denom = pxLength * dyLength - pyLength * dxLength;
121 float param = ((d1.x() - p1.x()) * dyLength - (d1.y() - p1.y()) * dxLength) / denom;
123 intersection.setX(p1.x() + param * pxLength);
124 intersection.setY(p1.y() + param * pyLength);