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/*
Copyright (C) Research In Motion Limited 2010. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
aint with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.
*/
#ifndef SVGMarkerData_h
#define SVGMarkerData_h
#if ENABLE(SVG)
#include "FloatConversion.h"
#include "Path.h"
#include <wtf/MathExtras.h>
namespace WebCore {
class RenderSVGResourceMarker;
class SVGMarkerData {
public:
enum Type {
Unknown = 0,
Start,
Mid,
End
};
SVGMarkerData(const Type& type = Unknown, RenderSVGResourceMarker* marker = 0)
: m_type(type)
, m_marker(marker)
{
}
FloatPoint origin() const { return m_origin; }
RenderSVGResourceMarker* marker() const { return m_marker; }
float currentAngle() const
{
FloatSize inslopeChange = m_inslopePoints[1] - m_inslopePoints[0];
FloatSize outslopeChange = m_outslopePoints[1] - m_outslopePoints[0];
double inslope = rad2deg(atan2(inslopeChange.height(), inslopeChange.width()));
double outslope = rad2deg(atan2(outslopeChange.height(), outslopeChange.width()));
double angle = 0;
switch (m_type) {
case Start:
angle = outslope;
break;
case Mid:
angle = (inslope + outslope) / 2;
break;
case End:
angle = inslope;
break;
default:
ASSERT_NOT_REACHED();
break;
}
return narrowPrecisionToFloat(angle);
}
void updateTypeAndMarker(const Type& type, RenderSVGResourceMarker* marker)
{
m_type = type;
m_marker = marker;
}
void updateOutslope(const FloatPoint& point)
{
m_outslopePoints[0] = m_origin;
m_outslopePoints[1] = point;
}
void updateMarkerDataForPathElement(const PathElement* element)
{
FloatPoint* points = element->points;
switch (element->type) {
case PathElementAddQuadCurveToPoint:
// FIXME: https://bugs.webkit.org/show_bug.cgi?id=33115 (PathElementAddQuadCurveToPoint not handled for <marker>)
m_origin = points[1];
break;
case PathElementAddCurveToPoint:
m_inslopePoints[0] = points[1];
m_inslopePoints[1] = points[2];
m_origin = points[2];
break;
case PathElementMoveToPoint:
m_subpathStart = points[0];
case PathElementAddLineToPoint:
updateInslope(points[0]);
m_origin = points[0];
break;
case PathElementCloseSubpath:
updateInslope(points[0]);
m_origin = m_subpathStart;
m_subpathStart = FloatPoint();
}
}
private:
void updateInslope(const FloatPoint& point)
{
m_inslopePoints[0] = m_origin;
m_inslopePoints[1] = point;
}
Type m_type;
RenderSVGResourceMarker* m_marker;
FloatPoint m_origin;
FloatPoint m_subpathStart;
FloatPoint m_inslopePoints[2];
FloatPoint m_outslopePoints[2];
};
}
#endif // ENABLE(SVG)
#endif // SVGMarkerData_h
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