/// <summary>
/// Builds a shading pattern from an radial gradient brush.
/// </summary>
public static PdfShadingPattern BuildFromRadialGradientBrush(DocumentRenderingContext context, RadialGradientBrush brush, XRect boundingBox, XMatrix transform)
{
RadialShadingBuilder builder = new RadialShadingBuilder(context);
PdfShadingPattern pattern = builder.BuildPattern(brush, boundingBox, transform);
return(pattern);
}
/// <summary>
/// Builds a shading pattern from an radial gradient brush.
/// </summary>
public static PdfShadingPattern BuildFromRadialGradientBrush(DocumentRenderingContext context, RadialGradientBrush brush, XRect boundingBox, XMatrix transform)
{
RadialShadingBuilder builder = new RadialShadingBuilder(context);
PdfShadingPattern pattern = builder.BuildPattern(brush, boundingBox, transform);
return pattern;
}
/// <summary>
/// Writes a Path to the content stream.
/// </summary>
private void WritePath(Path path)
{
if (WriteSingleLineStrokeWithSpecialCaps(path))
{
return;
}
WriteSaveState("begin Path", path.Name);
// Transform also affects clipping and opacity mask
if (path.RenderTransform != null && this.renderMode == RenderMode.Default)
{
MultiplyTransform(path.RenderTransform);
WriteRenderTransform(path.RenderTransform);
}
if (path.Clip != null && this.renderMode == RenderMode.Default)
{
WriteClip(path.Clip);
}
if (path.Opacity < 1)
{
MultiplyOpacity(path.Opacity);
}
if (path.OpacityMask != null)
{
WriteOpacityMask(path.OpacityMask);
}
if (path.Fill == null)
{
if (path.Stroke != null)
{
WriteStrokeGeometry(path);
}
else
{
Debug.Assert(false, "??? Path with neither Stroke nor Fill encountered.");
}
}
else
{
SolidColorBrush sBrush;
LinearGradientBrush lgBrush;
RadialGradientBrush rgBrush;
ImageBrush iBrush;
VisualBrush vBrush;
if ((sBrush = path.Fill as SolidColorBrush) != null)
{
Color color = sBrush.Color;
double opacity = Opacity * color.ScA;
if (opacity < 1)
{
RealizeFillOpacity(opacity);
}
WriteRgb(color, " rg\n");
if (path.Stroke != null)
{
RealizeStroke(path);
}
WriteGeometry(path.Data);
WritePathFillStroke(path);
}
else if ((lgBrush = path.Fill as LinearGradientBrush) != null)
{
// TODO: For better visual compatibility use a Shading Pattern if Opacity is not 1 and
// the Stroke Style is not solid. Acrobat 8 ignores this case.
PdfExtGState xgState = Context.PdfDocument.Internals.CreateIndirectObject <PdfExtGState>();
xgState.SetDefault1();
double opacity = Opacity * lgBrush.Opacity;;
if (opacity < 1)
{
xgState.StrokeAlpha = opacity;
xgState.NonStrokeAlpha = opacity;
}
RealizeExtGState(xgState);
// 1st draw fill
if (lgBrush.GradientStops.HasTransparency)
{
// Create a FormXObject with a soft mask
PdfFormXObject form = LinearShadingBuilder.BuildFormFromLinearGradientBrush(Context, lgBrush, path.Data);
string foName = Resources.AddForm(form);
WriteLiteral(foName + " Do\n");
}
else
{
// Create just a shading
PdfShading shading = LinearShadingBuilder.BuildShadingFromLinearGradientBrush(Context, lgBrush);
string shName = Resources.AddShading(shading);
WriteLiteral("q\n");
WriteClip(path.Data);
WriteLiteral("BX " + shName + " sh EX Q\n");
}
// 2nd draw stroke
if (path.Stroke != null)
{
WriteStrokeGeometry(path);
}
}
else if ((rgBrush = path.Fill as RadialGradientBrush) != null)
{
PdfExtGState xgState = Context.PdfDocument.Internals.CreateIndirectObject <PdfExtGState>();
xgState.SetDefault1();
double avGradientOpacity = rgBrush.GradientStops.GetAverageAlpha(); // HACK
double opacity = Opacity * rgBrush.Opacity * avGradientOpacity;
if (opacity < 1)
{
xgState.StrokeAlpha = opacity;
xgState.NonStrokeAlpha = opacity;
}
//RealizeExtGState(xgState);
XRect boundingBox = path.Data.GetBoundingBox();
// Always creates a pattern, because the background must be filled
PdfShadingPattern pattern = RadialShadingBuilder.BuildFromRadialGradientBrush(Context, rgBrush, boundingBox, Transform);
string paName = Resources.AddPattern(pattern);
// stream
// /CS0 cs /P0 scn
// /GS0 gs
// 0 480 180 -90 re
// f*
// endstream
// endobj
WriteLiteral("/Pattern cs " + paName + " scn\n");
// move to here: RealizeExtGState(xgState);
RealizeExtGState(xgState);
WriteGeometry(path.Data);
if (path.Data.FillRule == FillRule.NonZero) // NonZero means Winding
{
WriteLiteral("f\n");
}
else
{
WriteLiteral("f*\n");
}
// 2nd draw stroke
if (path.Stroke != null)
{
WriteStrokeGeometry(path);
}
}
else if ((iBrush = path.Fill as ImageBrush) != null)
{
PdfExtGState xgState = Context.PdfDocument.Internals.CreateIndirectObject <PdfExtGState>();
xgState.SetDefault1();
double opacity = Opacity * iBrush.Opacity;
if (opacity <= 1)
{
xgState.StrokeAlpha = opacity;
xgState.NonStrokeAlpha = opacity;
}
RealizeExtGState(xgState);
// 1st draw fill
PdfTilingPattern pattern = TilingPatternBuilder.BuildFromImageBrush(Context, iBrush, Transform);
string name = Resources.AddPattern(pattern);
WriteLiteral("/Pattern cs " + name + " scn\n");
WriteGeometry(path.Data);
WritePathFillStroke(path);
// 2nd draw stroke
if (path.Stroke != null)
{
WriteStrokeGeometry(path);
}
}
else if ((vBrush = path.Fill as VisualBrush) != null)
{
PdfExtGState xgState = Context.PdfDocument.Internals.CreateIndirectObject <PdfExtGState>();
xgState.SetDefault1();
double opacity = Opacity * vBrush.Opacity;
if (opacity < 1)
{
xgState.StrokeAlpha = opacity;
xgState.NonStrokeAlpha = opacity;
}
RealizeExtGState(xgState);
// 1st draw fill
PdfTilingPattern pattern = TilingPatternBuilder.BuildFromVisualBrush(Context, vBrush, Transform);
string name = Resources.AddPattern(pattern);
WriteLiteral("/Pattern cs " + name + " scn\n");
WriteGeometry(path.Data);
WritePathFillStroke(path);
// 2nd draw stroke
if (path.Stroke != null)
{
WriteStrokeGeometry(path);
}
}
else
{
Debug.Assert(false, "Unknown brush type encountered.");
}
}
WriteRestoreState("end Path", path.Name);
}