public override Brush GetBrush(SvgVisualElement renderingElement, ISvgRenderer renderer, float opacity, bool forStroke = false)
{
LoadStops(renderingElement);
try
{
if (this.GradientUnits == SvgCoordinateUnits.ObjectBoundingBox)
{
renderer.SetBoundable(renderingElement);
}
// Calculate the path and transform it appropriately
var center = new PointF(NormalizeUnit(CenterX).ToDeviceValue(renderer, UnitRenderingType.Horizontal, this),
NormalizeUnit(CenterY).ToDeviceValue(renderer, UnitRenderingType.Vertical, this));
var focals = new PointF[] { new PointF(NormalizeUnit(FocalX).ToDeviceValue(renderer, UnitRenderingType.Horizontal, this),
NormalizeUnit(FocalY).ToDeviceValue(renderer, UnitRenderingType.Vertical, this)) };
var specifiedRadius = NormalizeUnit(Radius).ToDeviceValue(renderer, UnitRenderingType.Other, this);
var path = new GraphicsPath();
path.AddEllipse(
center.X - specifiedRadius, center.Y - specifiedRadius,
specifiedRadius * 2, specifiedRadius * 2
);
using (var transform = EffectiveGradientTransform)
{
var bounds = renderer.GetBoundable().Bounds;
transform.Translate(bounds.X, bounds.Y, MatrixOrder.Prepend);
if (this.GradientUnits == SvgCoordinateUnits.ObjectBoundingBox)
{
transform.Scale(bounds.Width, bounds.Height, MatrixOrder.Prepend);
}
path.Transform(transform);
transform.TransformPoints(focals);
}
// Calculate any required scaling
var scaleBounds = RectangleF.Inflate(renderingElement.Bounds, renderingElement.StrokeWidth, renderingElement.StrokeWidth);
var scale = CalcScale(scaleBounds, path);
// Not ideal, but this makes sure that the rest of the shape gets properly filled or drawn
if (scale > 1.0f && SpreadMethod == SvgGradientSpreadMethod.Pad)
{
var stop = Stops.Last();
var origColor = stop.GetColor(renderingElement);
var renderColor = System.Drawing.Color.FromArgb((int)Math.Round(opacity * stop.Opacity * 255), origColor);
var origClip = renderer.GetClip();
try
{
using (var solidBrush = new SolidBrush(renderColor))
{
var newClip = origClip.Clone();
newClip.Exclude(path);
renderer.SetClip(newClip);
var renderPath = (GraphicsPath)renderingElement.Path(renderer);
if (forStroke)
{
using (var pen = new Pen(solidBrush, renderingElement.StrokeWidth.ToDeviceValue(renderer, UnitRenderingType.Other, renderingElement)))
{
renderer.DrawPath(pen, renderPath);
}
}
else
{
renderer.FillPath(solidBrush, renderPath);
}
}
}
finally
{
renderer.SetClip(origClip);
}
}
// Get the color blend and any tweak to the scaling
var blend = CalculateColorBlend(renderer, opacity, scale, out scale);
// Transform the path based on the scaling
var gradBounds = path.GetBounds();
var transCenter = new PointF(gradBounds.Left + gradBounds.Width / 2, gradBounds.Top + gradBounds.Height / 2);
using (var scaleMat = new Matrix())
{
scaleMat.Translate(-1 * transCenter.X, -1 * transCenter.Y, MatrixOrder.Append);
scaleMat.Scale(scale, scale, MatrixOrder.Append);
scaleMat.Translate(transCenter.X, transCenter.Y, MatrixOrder.Append);
path.Transform(scaleMat);
}
// calculate the brush
var brush = new PathGradientBrush(path);
brush.CenterPoint = focals[0];
brush.InterpolationColors = blend;
return(brush);
}
finally
{
if (this.GradientUnits == SvgCoordinateUnits.ObjectBoundingBox)
{
renderer.PopBoundable();
}
}
}