void RealizeLinearGradientBrush(LinearGradientBrush brush, XForm xform)
{
XMatrix matrix = currentTransform;
PdfShadingPattern pattern = new PdfShadingPattern(writer.Owner);
pattern.Elements[PdfShadingPattern.Keys.PatternType] = new PdfInteger(2); // shading pattern
// Setup shading
PdfShading shading = new PdfShading(writer.Owner);
PdfColorMode colorMode = PdfColorMode.Rgb; //this.document.Options.ColorMode;
PdfDictionary function = BuildShadingFunction(brush.GradientStops, colorMode);
function.Elements.SetString("/@", "This is the shading function of a LinearGradientBrush");
shading.Elements[PdfShading.Keys.Function] = function;
shading.Elements[PdfShading.Keys.ShadingType] = new PdfInteger(2); // Axial shading
//if (colorMode != PdfColorMode.Cmyk)
shading.Elements[PdfShading.Keys.ColorSpace] = new PdfName("/DeviceRGB");
//else
//shading.Elements[Keys.ColorSpace] = new PdfName("/DeviceCMYK");
//double x1 = 0, y1 = 0, x2 = 0, y2 = 0;
double x1 = brush.StartPoint.X;
double y1 = brush.StartPoint.Y;
double x2 = brush.EndPoint.X;
double y2 = brush.EndPoint.Y;
shading.Elements[PdfShading.Keys.Coords] = new PdfLiteral("[{0:0.###} {1:0.###} {2:0.###} {3:0.###}]", x1, y1, x2, y2);
// old: Elements[Keys.Background] = new PdfRawItem("[0 1 1]");
// old: Elements[Keys.Domain] =
shading.Elements[PdfShading.Keys.Extend] = new PdfLiteral("[true true]");
// Setup pattern
pattern.Elements[PdfShadingPattern.Keys.Shading] = shading;
pattern.Elements[PdfShadingPattern.Keys.Matrix] = PdfLiteral.FromMatrix(matrix); // new PdfLiteral("[" + PdfEncoders.ToString(matrix) + "]");
string name = writer.Resources.AddPattern(pattern);
writer.WriteLiteral("/Pattern cs\n", name);
writer.WriteLiteral("{0} scn\n", name);
double alpha = brush.Opacity * brush.GradientStops.GetAverageAlpha();
if (alpha < 1 && writer.renderMode == RenderMode.Default)
{
#if true
PdfExtGState extGState = writer.Owner.ExtGStateTable.GetExtGStateNonStroke(alpha);
string gs = writer.Resources.AddExtGState(extGState);
writer.WriteLiteral("{0} gs\n", gs);
#else
#if true
if (xform == null)
{
PdfExtGState extGState = this.writer.Owner.ExtGStateTable.GetExtGStateNonStroke(alpha);
string gs = this.writer.Resources.AddExtGState(extGState);
this.writer.WriteGraphicState(extGState);
}
else
{
//PdfFormXObject pdfForm = this.writer.Owner.FormTable.GetForm(form);
PdfFormXObject pdfForm = xform.pdfForm;
pdfForm.Elements.SetString("/@", "This is the Form XObject of the soft mask");
string formName = this.writer.Resources.AddForm(pdfForm);
PdfTransparencyGroupAttributes tgAttributes = new PdfTransparencyGroupAttributes(this.writer.Owner);
//this.writer.Owner.Internals.AddObject(tgAttributes);
tgAttributes.Elements.SetName(PdfTransparencyGroupAttributes.Keys.CS, "/DeviceRGB");
// Set reference to transparency group attributes
pdfForm.Elements.SetObject(PdfFormXObject.Keys.Group, tgAttributes);
pdfForm.Elements[PdfFormXObject.Keys.Matrix] = new PdfLiteral("[1.001 0 0 1.001 0.001 0.001]");
PdfSoftMask softmask = new PdfSoftMask(this.writer.Owner);
this.writer.Owner.Internals.AddObject(softmask);
softmask.Elements.SetString("/@", "This is the soft mask");
softmask.Elements.SetName(PdfSoftMask.Keys.S, "/Luminosity");
softmask.Elements.SetReference(PdfSoftMask.Keys.G, pdfForm);
//pdfForm.Elements.SetName(PdfFormXObject.Keys.Type, "Group");
//pdfForm.Elements.SetName(PdfFormXObject.Keys.ss.Ss.Type, "Group");
PdfExtGState extGState = new PdfExtGState(this.writer.Owner);
this.writer.Owner.Internals.AddObject(extGState);
extGState.Elements.SetReference(PdfExtGState.Keys.SMask, softmask);
this.writer.WriteGraphicState(extGState);
}
#else
XForm form = new XForm(this.writer.Owner, 220, 140);
XGraphics formGfx = XGraphics.FromForm(form);
// draw something
//XSolidBrush xbrush = new XSolidBrush(XColor.FromArgb(128, 128, 128));
XLinearGradientBrush xbrush = new XLinearGradientBrush(new XPoint(0, 0), new XPoint(220, 0), XColors.White, XColors.Black);
formGfx.DrawRectangle(xbrush, -10000, -10000, 20000, 20000);
//formGfx.DrawString("Text, Graphics, Images, and Forms", new XFont("Verdana", 10, XFontStyle.Regular), XBrushes.Navy, 3, 0, XStringFormat.TopLeft);
formGfx.Dispose();
// Close form
form.Finish();
PdfFormXObject pdfForm = this.writer.Owner.FormTable.GetForm(form);
string formName = this.writer.Resources.AddForm(pdfForm);
//double x = 20, y = 20;
//double cx = 1;
//double cy = 1;
//this.writer.AppendFormat("q {2:0.###} 0 0 -{3:0.###} {0:0.###} {4:0.###} cm 100 Tz {5} Do Q\n",
// x, y, cx, cy, y + 0, formName);
//this.writer.AppendFormat("q {2:0.###} 0 0 -{3:0.###} {0:0.###} {4:0.###} cm 100 Tz {5} Do Q\n",
// x, y, cx, cy, y + 220/1.5, formName);
PdfTransparencyGroupAttributes tgAttributes = new PdfTransparencyGroupAttributes(this.writer.Owner);
this.writer.Owner.Internals.AddObject(tgAttributes);
tgAttributes.Elements.SetName(PdfTransparencyGroupAttributes.Keys.CS, "/DeviceRGB");
// Set reference to transparency group attributes
pdfForm.Elements.SetReference(PdfFormXObject.Keys.Group, tgAttributes);
PdfSoftMask softmask = new PdfSoftMask(this.writer.Owner);
this.writer.Owner.Internals.AddObject(softmask);
softmask.Elements.SetName(PdfSoftMask.Keys.S, "/Luminosity");
softmask.Elements.SetReference(PdfSoftMask.Keys.G, pdfForm);
//pdfForm.Elements.SetName(PdfFormXObject.Keys.Type, "Group");
//pdfForm.Elements.SetName(PdfFormXObject.Keys.ss.Ss.Type, "Group");
PdfExtGState extGState = new PdfExtGState(this.writer.Owner);
this.writer.Owner.Internals.AddObject(extGState);
extGState.Elements.SetReference(PdfExtGState.Keys.SMask, softmask);
this.writer.WriteGraphicState(extGState);
#endif
#endif
}
}