// ===========================================================================
public override void Write(Stream stream) {
// step 1
using (Document document = new Document()) {
// step 2
PdfWriter writer = PdfWriter.GetInstance(document, stream);
// step 3
document.Open();
// step 4
PdfContentByte canvas = writer.DirectContent;
PdfShading axial = PdfShading.SimpleAxial(writer, 36, 716, 396,
788, BaseColor.ORANGE, BaseColor.BLUE
);
canvas.PaintShading(axial);
document.NewPage();
PdfShading radial = PdfShading.SimpleRadial(writer,
200, 700, 50, 300, 700, 100,
new BaseColor(0xFF, 0xF7, 0x94),
new BaseColor(0xF7, 0x8A, 0x6B),
false, false
);
canvas.PaintShading(radial);
PdfShadingPattern shading = new PdfShadingPattern(axial);
ColorRectangle(canvas, new ShadingColor(shading), 150, 420, 126, 126);
canvas.SetShadingFill(shading);
canvas.Rectangle(300, 420, 126, 126);
canvas.FillStroke();
}
}
// ---------------------------------------------------------------------------
/**
* Prints a square and fills half of it with a gray rectangle.
*
* @param x
* @param y
* @param cb
* @throws Exception
*/
public static void PictureBackdrop(float x, float y, PdfContentByte cb,
PdfWriter writer)
{
PdfShading axial = PdfShading.SimpleAxial(writer, x, y, x + 200, y,
BaseColor.YELLOW, BaseColor.RED
);
PdfShadingPattern axialPattern = new PdfShadingPattern(axial);
cb.SetShadingFill(axialPattern);
cb.SetColorStroke(BaseColor.BLACK);
cb.SetLineWidth(2);
cb.Rectangle(x, y, 200, 200);
cb.FillStroke();
}
/// <summary>
/// Draws a rectangular gradient background color.
/// </summary>
/// <param name="position">The coordinates of the cell</param>
/// <param name="canvases">An array of PdfContentByte to add text or graphics</param>
/// <param name="startColor">Gradient's Start Color</param>
/// <param name="endColor">Gradient's End Color</param>
public static void DrawGradientBackground(this Rectangle position, PdfContentByte[] canvases, BaseColor startColor, BaseColor endColor)
{
if (startColor == null || endColor == null) return;
var cb = canvases[PdfPTable.BACKGROUNDCANVAS];
cb.SaveState();
var shading = PdfShading.SimpleAxial(
cb.PdfWriter,
position.Left, position.Top, position.Left, position.Bottom,
startColor, endColor);
var shadingPattern = new PdfShadingPattern(shading);
cb.SetShadingFill(shadingPattern);
cb.Rectangle(position.Left, position.Bottom, position.Width, position.Height);
cb.Fill();
cb.RestoreState();
}
internal void AddSimpleShadingPattern(PdfShadingPattern shading) {
if (!documentShadingPatterns.ContainsKey(shading)) {
shading.Name = patternNumber;
++patternNumber;
documentShadingPatterns[shading] = null;
AddSimpleShading(shading.Shading);
}
}
/**
* Sets the shading stroke pattern
* @param shading the shading pattern
*/
public virtual void SetShadingStroke(PdfShadingPattern shading)
{
writer.AddSimpleShadingPattern(shading);
PageResources prs = PageResources;
PdfName name = prs.AddPattern(shading.PatternName, shading.PatternReference);
content.Append(PdfName.PATTERN.GetBytes()).Append(" CS ").Append(name.GetBytes()).Append(" SCN").Append_i(separator);
ColorDetails details = shading.ColorDetails;
if (details != null)
prs.AddColor(details.ColorName, details.IndirectReference);
}
/**
* Paints using a shading pattern.
* @param shading the shading pattern
*/
public virtual void PaintShading(PdfShadingPattern shading)
{
PaintShading(shading.Shading);
}
/**
* Sets the shading fill pattern.
* @param shading the shading pattern
*/
public virtual void SetShadingFill(PdfShadingPattern shading) {
writer.AddSimpleShadingPattern(shading);
PageResources prs = PageResources;
PdfName name = prs.AddPattern(shading.PatternName, shading.PatternReference);
SaveColor(new ShadingColor(shading), true);
content.Append(PdfName.PATTERN.GetBytes()).Append(" cs ").Append(name.GetBytes()).Append(" scn").Append_i(separator);
ColorDetails details = shading.ColorDetails;
if (details != null)
prs.AddColor(details.ColorSpaceName, details.IndirectReference);
}
public ShadingColor(PdfShadingPattern shadingPattern) : base(TYPE_SHADING, .5f, .5f, .5f) {
this.shadingPattern = shadingPattern;
}
public ShadingColor(PdfShadingPattern shadingPattern) : base(TYPE_SHADING, .5f, .5f, .5f)
{
this.shadingPattern = shadingPattern;
}
