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128 lines
3.7 KiB
C++
128 lines
3.7 KiB
C++
/*
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* Copyright (C) 2004, 2006, 2007 Apple Inc. All rights reserved.
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* Copyright (C) 2005 Nokia. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "flutter/sky/engine/platform/geometry/FloatPoint.h"
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#include <math.h>
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#include <limits>
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#include "flutter/sky/engine/platform/FloatConversion.h"
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#include "flutter/sky/engine/platform/geometry/LayoutPoint.h"
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#include "flutter/sky/engine/platform/geometry/LayoutSize.h"
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#include "third_party/skia/include/core/SkPoint.h"
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namespace blink {
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// Skia has problems when passed infinite, etc floats, filter them to 0.
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static inline SkScalar WebCoreFloatToSkScalar(float f)
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{
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return SkFloatToScalar(std::isfinite(f) ? f : 0);
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}
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FloatPoint::FloatPoint(const IntPoint& p) : m_x(p.x()), m_y(p.y())
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{
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}
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FloatPoint::FloatPoint(const LayoutPoint& p)
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: m_x(p.x().toFloat())
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, m_y(p.y().toFloat())
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{
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}
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void FloatPoint::normalize()
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{
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float tempLength = length();
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if (tempLength) {
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m_x /= tempLength;
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m_y /= tempLength;
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}
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}
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float FloatPoint::slopeAngleRadians() const
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{
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return atan2f(m_y, m_x);
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}
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float FloatPoint::length() const
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{
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return sqrtf(lengthSquared());
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}
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void FloatPoint::move(const LayoutSize& size)
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{
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m_x += size.width();
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m_y += size.height();
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}
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void FloatPoint::moveBy(const LayoutPoint& point)
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{
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m_x += point.x();
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m_y += point.y();
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}
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SkPoint FloatPoint::data() const
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{
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SkPoint p = { WebCoreFloatToSkScalar(m_x), WebCoreFloatToSkScalar(m_y) };
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return p;
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}
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FloatPoint FloatPoint::narrowPrecision(double x, double y)
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{
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return FloatPoint(narrowPrecisionToFloat(x), narrowPrecisionToFloat(y));
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}
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float findSlope(const FloatPoint& p1, const FloatPoint& p2, float& c)
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{
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if (p2.x() == p1.x())
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return std::numeric_limits<float>::infinity();
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// y = mx + c
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float slope = (p2.y() - p1.y()) / (p2.x() - p1.x());
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c = p1.y() - slope * p1.x();
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return slope;
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}
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bool findIntersection(const FloatPoint& p1, const FloatPoint& p2, const FloatPoint& d1, const FloatPoint& d2, FloatPoint& intersection)
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{
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float pxLength = p2.x() - p1.x();
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float pyLength = p2.y() - p1.y();
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float dxLength = d2.x() - d1.x();
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float dyLength = d2.y() - d1.y();
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float denom = pxLength * dyLength - pyLength * dxLength;
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if (!denom)
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return false;
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float param = ((d1.x() - p1.x()) * dyLength - (d1.y() - p1.y()) * dxLength) / denom;
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intersection.setX(p1.x() + param * pxLength);
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intersection.setY(p1.y() + param * pyLength);
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return true;
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}
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}
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