RenderSVGResourceRadialGradient.cpp [plain text]
#include "config.h"
#if ENABLE(SVG)
#include "RenderSVGResourceRadialGradient.h"
#include "RadialGradientAttributes.h"
#include "SVGRadialGradientElement.h"
namespace WebCore {
RenderSVGResourceType RenderSVGResourceRadialGradient::s_resourceType = RadialGradientResourceType;
RenderSVGResourceRadialGradient::RenderSVGResourceRadialGradient(SVGRadialGradientElement* node)
: RenderSVGResourceGradient(node)
{
}
RenderSVGResourceRadialGradient::~RenderSVGResourceRadialGradient()
{
}
bool RenderSVGResourceRadialGradient::collectGradientAttributes(SVGGradientElement* gradientElement)
{
m_attributes = RadialGradientAttributes();
return static_cast<SVGRadialGradientElement*>(gradientElement)->collectGradientAttributes(m_attributes);
}
FloatPoint RenderSVGResourceRadialGradient::centerPoint(const RadialGradientAttributes& attributes) const
{
return SVGLengthContext::resolvePoint(static_cast<const SVGElement*>(node()), attributes.gradientUnits(), attributes.cx(), attributes.cy());
}
FloatPoint RenderSVGResourceRadialGradient::focalPoint(const RadialGradientAttributes& attributes) const
{
return SVGLengthContext::resolvePoint(static_cast<const SVGElement*>(node()), attributes.gradientUnits(), attributes.fx(), attributes.fy());
}
float RenderSVGResourceRadialGradient::radius(const RadialGradientAttributes& attributes) const
{
return SVGLengthContext::resolveLength(static_cast<const SVGElement*>(node()), attributes.gradientUnits(), attributes.r());
}
void RenderSVGResourceRadialGradient::adjustFocalPointIfNeeded(float radius, const FloatPoint& centerPoint, FloatPoint& focalPoint) const
{
float deltaX = focalPoint.x() - centerPoint.x();
float deltaY = focalPoint.y() - centerPoint.y();
float radiusMax = 0.99f * radius;
if (sqrt(deltaX * deltaX + deltaY * deltaY) <= radiusMax)
return;
float angle = atan2f(deltaY, deltaX);
deltaX = cosf(angle) * radiusMax;
deltaY = sinf(angle) * radiusMax;
focalPoint = FloatPoint(deltaX + centerPoint.x(), deltaY + centerPoint.y());
}
void RenderSVGResourceRadialGradient::buildGradient(GradientData* gradientData) const
{
float radius = this->radius(m_attributes);
FloatPoint centerPoint = this->centerPoint(m_attributes);
FloatPoint focalPoint = this->focalPoint(m_attributes);
adjustFocalPointIfNeeded(radius, centerPoint, focalPoint);
gradientData->gradient = Gradient::create(focalPoint,
0, centerPoint,
radius);
gradientData->gradient->setSpreadMethod(platformSpreadMethodFromSVGType(m_attributes.spreadMethod()));
addStops(gradientData, m_attributes.stops());
}
}
#endif