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/*
* Copyright (C) 2003, 2006 Apple Computer, Inc. All rights reserved.
* 2006 Rob Buis <buis@kde.org>
* Copyright (C) 2007 Eric Seidel <eric@webkit.org>
*
* 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
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "Path.h"
#include "FloatPoint.h"
#include "FloatRect.h"
#include "PathTraversalState.h"
#include <math.h>
#include <wtf/MathExtras.h>
// Approximation of control point positions on a bezier to simulate a quarter of a circle.
static const float gCircleControlPoint = 0.448f;
namespace WebCore {
#if !PLATFORM(OPENVG) && !PLATFORM(QT)
static void pathLengthApplierFunction(void* info, const PathElement* element)
{
PathTraversalState& traversalState = *static_cast<PathTraversalState*>(info);
if (traversalState.m_success)
return;
traversalState.m_previous = traversalState.m_current;
FloatPoint* points = element->points;
float segmentLength = 0;
switch (element->type) {
case PathElementMoveToPoint:
segmentLength = traversalState.moveTo(points[0]);
break;
case PathElementAddLineToPoint:
segmentLength = traversalState.lineTo(points[0]);
break;
case PathElementAddQuadCurveToPoint:
segmentLength = traversalState.quadraticBezierTo(points[0], points[1]);
break;
case PathElementAddCurveToPoint:
segmentLength = traversalState.cubicBezierTo(points[0], points[1], points[2]);
break;
case PathElementCloseSubpath:
segmentLength = traversalState.closeSubpath();
break;
}
traversalState.m_totalLength += segmentLength;
if ((traversalState.m_action == PathTraversalState::TraversalPointAtLength ||
traversalState.m_action == PathTraversalState::TraversalNormalAngleAtLength) &&
(traversalState.m_totalLength >= traversalState.m_desiredLength)) {
FloatSize change = traversalState.m_current - traversalState.m_previous;
float slope = atan2f(change.height(), change.width());
if (traversalState.m_action == PathTraversalState::TraversalPointAtLength) {
float offset = traversalState.m_desiredLength - traversalState.m_totalLength;
traversalState.m_current.move(offset * cosf(slope), offset * sinf(slope));
} else
traversalState.m_normalAngle = rad2deg(slope);
traversalState.m_success = true;
}
}
float Path::length() const
{
PathTraversalState traversalState(PathTraversalState::TraversalTotalLength);
apply(&traversalState, pathLengthApplierFunction);
return traversalState.m_totalLength;
}
FloatPoint Path::pointAtLength(float length, bool& ok) const
{
PathTraversalState traversalState(PathTraversalState::TraversalPointAtLength);
traversalState.m_desiredLength = length;
apply(&traversalState, pathLengthApplierFunction);
ok = traversalState.m_success;
return traversalState.m_current;
}
float Path::normalAngleAtLength(float length, bool& ok) const
{
PathTraversalState traversalState(PathTraversalState::TraversalNormalAngleAtLength);
traversalState.m_desiredLength = length ? length : std::numeric_limits<float>::epsilon();
apply(&traversalState, pathLengthApplierFunction);
ok = traversalState.m_success;
return traversalState.m_normalAngle;
}
#endif
void Path::addRoundedRect(const FloatRect& rect, const FloatSize& roundingRadii)
{
if (rect.isEmpty())
return;
FloatSize radius(roundingRadii);
FloatSize halfSize(rect.width() / 2, rect.height() / 2);
// If rx is greater than half of the width of the rectangle
// then set rx to half of the width (required in SVG spec)
if (radius.width() > halfSize.width())
radius.setWidth(halfSize.width());
// If ry is greater than half of the height of the rectangle
// then set ry to half of the height (required in SVG spec)
if (radius.height() > halfSize.height())
radius.setHeight(halfSize.height());
moveTo(FloatPoint(rect.x() + radius.width(), rect.y()));
if (radius.width() < halfSize.width())
addLineTo(FloatPoint(rect.x() + rect.width() - roundingRadii.width(), rect.y()));
addBezierCurveTo(FloatPoint(rect.x() + rect.width() - radius.width() * gCircleControlPoint, rect.y()), FloatPoint(rect.x() + rect.width(), rect.y() + radius.height() * gCircleControlPoint), FloatPoint(rect.x() + rect.width(), rect.y() + radius.height()));
if (radius.height() < halfSize.height())
addLineTo(FloatPoint(rect.x() + rect.width(), rect.y() + rect.height() - radius.height()));
addBezierCurveTo(FloatPoint(rect.x() + rect.width(), rect.y() + rect.height() - radius.height() * gCircleControlPoint), FloatPoint(rect.x() + rect.width() - radius.width() * gCircleControlPoint, rect.y() + rect.height()), FloatPoint(rect.x() + rect.width() - radius.width(), rect.y() + rect.height()));
if (radius.width() < halfSize.width())
addLineTo(FloatPoint(rect.x() + radius.width(), rect.y() + rect.height()));
addBezierCurveTo(FloatPoint(rect.x() + radius.width() * gCircleControlPoint, rect.y() + rect.height()), FloatPoint(rect.x(), rect.y() + rect.height() - radius.height() * gCircleControlPoint), FloatPoint(rect.x(), rect.y() + rect.height() - radius.height()));
if (radius.height() < halfSize.height())
addLineTo(FloatPoint(rect.x(), rect.y() + radius.height()));
addBezierCurveTo(FloatPoint(rect.x(), rect.y() + radius.height() * gCircleControlPoint), FloatPoint(rect.x() + radius.width() * gCircleControlPoint, rect.y()), FloatPoint(rect.x() + radius.width(), rect.y()));
closeSubpath();
}
void Path::addRoundedRect(const FloatRect& rect, const FloatSize& topLeftRadius, const FloatSize& topRightRadius, const FloatSize& bottomLeftRadius, const FloatSize& bottomRightRadius)
{
if (rect.isEmpty())
return;
if (rect.width() < topLeftRadius.width() + topRightRadius.width()
|| rect.width() < bottomLeftRadius.width() + bottomRightRadius.width()
|| rect.height() < topLeftRadius.height() + bottomLeftRadius.height()
|| rect.height() < topRightRadius.height() + bottomRightRadius.height()) {
// If all the radii cannot be accommodated, return a rect.
addRect(rect);
return;
}
moveTo(FloatPoint(rect.x() + topLeftRadius.width(), rect.y()));
addLineTo(FloatPoint(rect.x() + rect.width() - topRightRadius.width(), rect.y()));
addBezierCurveTo(FloatPoint(rect.x() + rect.width() - topRightRadius.width() * gCircleControlPoint, rect.y()),
FloatPoint(rect.x() + rect.width(), rect.y() + topRightRadius.height() * gCircleControlPoint),
FloatPoint(rect.x() + rect.width(), rect.y() + topRightRadius.height()));
addLineTo(FloatPoint(rect.x() + rect.width(), rect.y() + rect.height() - bottomRightRadius.height()));
addBezierCurveTo(FloatPoint(rect.x() + rect.width(), rect.y() + rect.height() - bottomRightRadius.height() * gCircleControlPoint),
FloatPoint(rect.x() + rect.width() - bottomRightRadius.width() * gCircleControlPoint, rect.y() + rect.height()),
FloatPoint(rect.x() + rect.width() - bottomRightRadius.width(), rect.y() + rect.height()));
addLineTo(FloatPoint(rect.x() + bottomLeftRadius.width(), rect.y() + rect.height()));
addBezierCurveTo(FloatPoint(rect.x() + bottomLeftRadius.width() * gCircleControlPoint, rect.y() + rect.height()),
FloatPoint(rect.x(), rect.y() + rect.height() - bottomLeftRadius.height() * gCircleControlPoint),
FloatPoint(rect.x(), rect.y() + rect.height() - bottomLeftRadius.height()));
addLineTo(FloatPoint(rect.x(), rect.y() + topLeftRadius.height()));
addBezierCurveTo(FloatPoint(rect.x(), rect.y() + topLeftRadius.height() * gCircleControlPoint),
FloatPoint(rect.x() + topLeftRadius.width() * gCircleControlPoint, rect.y()),
FloatPoint(rect.x() + topLeftRadius.width(), rect.y()));
closeSubpath();
}
void Path::addRoundedRect(const RoundedIntRect& r)
{
addRoundedRect(r.rect(), r.radii().topLeft(), r.radii().topRight(), r.radii().bottomLeft(), r.radii().bottomRight());
}
}
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