protected void ManipulatePdf(string dest)
{
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
float x = 36;
float y = 740;
// Side of an equilateral triangle
float side = 70;
PdfShading.Axial axialShading = new PdfShading.Axial(new PdfDeviceCs.Rgb(), x, y,
ColorConstants.PINK.GetColorValue(),
x + side, y, ColorConstants.BLUE.GetColorValue());
PdfPattern.Shading shading = new PdfPattern.Shading(axialShading);
PdfCanvas canvas = new PdfCanvas(pdfDoc.AddNewPage());
canvas.SetFillColorShading(shading);
canvas.MoveTo(x, y);
canvas.LineTo(x + side, y);
canvas.LineTo(x + (side / 2), (float)(y + (side * Math.Sin(Math.PI / 3))));
canvas.ClosePathFillStroke();
pdfDoc.Close();
}
private static Color?GetColor(PdfPattern.Shading shading, float alpha)
{
var shadingDict = shading.GetShading();
var shadingConstructed = PdfShading.MakeShading(shadingDict);
switch (shadingConstructed)
{
case PdfShading.Axial axial:
var axialFunction = (PdfDictionary)axial.GetFunction();
GetFunctionDetails(axialFunction);
var coords = GetItemsFloat(axial.GetCoords());
var domain = GetItemsFloat(axial.GetDomain());
var extend = GetItemsBool(axial.GetExtend());
break;
case PdfShading.CoonsPatchMesh coonsPatchMesh:
break;
case PdfShading.FreeFormGouraudShadedTriangleMesh freeFormGouraudShadedTriangleMesh: break;
case PdfShading.FunctionBased functionBased: break;
case PdfShading.LatticeFormGouraudShadedTriangleMesh latticeFormGouraudShadedTriangleMesh:
break;
case PdfShading.Radial radial: break;
case PdfShading.TensorProductPatchMesh tensorProductPatchMesh: break;
}
return(null);
}
private void CheckInShadingPattern(PdfObject @object)
{
String newContentString = PdfACheckerTestUtils.GetStreamWithValue(@object);
byte[] newContent = newContentString.GetBytes(System.Text.Encoding.UTF8);
PdfStream stream = new PdfStream(newContent);
PdfPattern pattern = new PdfPattern.Shading(stream);
pdfA1Checker.CheckPdfObject(pattern.GetPdfObject());
}
/// <summary>
/// Builds the
/// <see cref="iText.Kernel.Colors.Color"/>
/// object representing the linear gradient with specified configuration
/// that fills the target bounding box.
/// </summary>
/// <param name="targetBoundingBox">the bounding box to be filled in current space</param>
/// <param name="contextTransform">
/// the transformation from the base coordinates space into
/// the current space. The
/// <see langword="null"/>
/// value is valid and can be used
/// if there is no transformation from base coordinates to current space
/// specified, or it is equal to identity transformation.
/// </param>
/// <param name="document">
/// the
/// <see cref="iText.Kernel.Pdf.PdfDocument"/>
/// for which the linear gradient would be built.
/// </param>
/// <returns>
/// the constructed
/// <see cref="iText.Kernel.Colors.Color"/>
/// or
/// <see langword="null"/>
/// if no color to be applied
/// or base gradient vector has been specified
/// </returns>
public virtual Color BuildColor(Rectangle targetBoundingBox, AffineTransform contextTransform, PdfDocument
document)
{
// TODO: DEVSIX-4136 the document argument would be required for opaque gradients (as we would need to create a mask form xObject)
Point[] baseCoordinatesVector = GetGradientVector(targetBoundingBox, contextTransform);
if (baseCoordinatesVector == null || this.stops.IsEmpty())
{
// Can not create gradient color with 0 stops or null coordinates vector
return(null);
}
// evaluate actual coordinates and transformation
AffineTransform shadingTransform = new AffineTransform();
if (contextTransform != null)
{
shadingTransform.Concatenate(contextTransform);
}
AffineTransform gradientTransformation = GetCurrentSpaceToGradientVectorSpaceTransformation(targetBoundingBox
, contextTransform);
if (gradientTransformation != null)
{
try {
if (targetBoundingBox != null)
{
targetBoundingBox = Rectangle.CalculateBBox(JavaUtil.ArraysAsList(gradientTransformation.InverseTransform(
new Point(targetBoundingBox.GetLeft(), targetBoundingBox.GetBottom()), null), gradientTransformation.InverseTransform
(new Point(targetBoundingBox.GetLeft(), targetBoundingBox.GetTop()), null), gradientTransformation.InverseTransform
(new Point(targetBoundingBox.GetRight(), targetBoundingBox.GetBottom()), null), gradientTransformation
.InverseTransform(new Point(targetBoundingBox.GetRight(), targetBoundingBox.GetTop()), null)));
}
shadingTransform.Concatenate(gradientTransformation);
}
catch (NoninvertibleTransformException) {
LogManager.GetLogger(GetType()).Error(iText.IO.LogMessageConstant.UNABLE_TO_INVERT_GRADIENT_TRANSFORMATION
);
}
}
PdfShading.Axial axial = CreateAxialShading(baseCoordinatesVector, this.stops, this.spreadMethod, targetBoundingBox
);
if (axial == null)
{
return(null);
}
PdfPattern.Shading shading = new PdfPattern.Shading(axial);
if (!shadingTransform.IsIdentity())
{
double[] matrix = new double[6];
shadingTransform.GetMatrix(matrix);
shading.SetMatrix(new PdfArray(matrix));
}
return(new PatternColor(shading));
}
protected void ManipulatePdf(String dest)
{
PageSize pageSize = new PageSize(150, 300);
PdfDocument pdfDoc = new PdfDocument(new PdfWriter(dest));
pdfDoc.SetDefaultPageSize(pageSize);
PdfCanvas canvas = new PdfCanvas(pdfDoc.AddNewPage());
PdfShading.Axial axial = new PdfShading.Axial(new PdfDeviceCs.Rgb(), 0, pageSize.GetHeight(),
ColorConstants.WHITE.GetColorValue(), 0, 0, ColorConstants.GREEN.GetColorValue());
PdfPattern.Shading pattern = new PdfPattern.Shading(axial);
canvas.SetFillColorShading(pattern);
canvas.Rectangle(0, 0, pageSize.GetWidth(), pageSize.GetHeight());
canvas.Fill();
pdfDoc.Close();
}
public void HandleEvent(Event evt)
{
// Retrieve document | 获取 PDF 文档
PdfDocumentEvent docEvent = (PdfDocumentEvent)evt;
PdfDocument pdf = docEvent.GetDocument();
PdfPage page = docEvent.GetPage();
int pdfTotalPageNumber = pdf.GetNumberOfPages();
int currentPageNumber = pdf.GetPageNumber(page);
// Do not add footer on cover and back cover | 封面和封底不加
//if (currentPageNumber == 1 || currentPageNumber == pdfTotalPageNumber)
//{
// return;
//}
// Width of text in footer | 文字宽度
float textWidth = pdfFont.GetWidth(footer["text"].ToString(), Convert.ToSingle(footer["fontSize"]));
// Color of text | 文字颜色
int[] rgb = footer["fontColor"].ToString().Split(',', StringSplitOptions.RemoveEmptyEntries).Select(x => Convert.ToInt32(x.Trim())).ToArray();
//// Doc parameters 文档参数
Rectangle pageSize = page.GetPageSize();
PdfCanvas pdfCanvas = new PdfCanvas(
page.GetLastContentStream(), page.GetResources(), pdf);
Canvas canvas = new Canvas(pdfCanvas, pdf, pageSize);
canvas.SetFontSize(Convert.ToSingle(footer["fontSize"]))
.SetFont(pdfFont)
.SetFontColor(new DeviceRgb(rgb[0], rgb[1], rgb[2]));
// Footer text/page NO. and position | 文字/页码及位置
string footerText = footer["text"].ToString();
string footerPageNum = (currentPageNumber - 1 < 10 ? "0" : "") + (currentPageNumber - 1);
float[] footerTextPos = new float[2];
float[] footerPageNumPos = new float[2];
float[] roundRectPos = new float[2];
TextAlignment alignment = TextAlignment.CENTER;
// Draw gradient background | 渐变背景
PdfShading.Axial axial;
if (currentPageNumber % 2 == 0)
{
// Align left in even number page, which page NO. is a odd | 偶数页左对齐(页码为奇数)
footerTextPos[0] = Convert.ToSingle(footer["left"]);
footerTextPos[1] = pageSize.GetBottom() + 19.7f;
footerPageNumPos[0] = textWidth + Convert.ToSingle(footer["left"]) + 9.5f;
footerPageNumPos[1] = pageSize.GetBottom() + 21.6f;
roundRectPos[0] = textWidth + Convert.ToSingle(footer["left"]) + 4.0f;
roundRectPos[1] = pageSize.GetBottom() + 22.0f;
alignment = TextAlignment.LEFT;
axial = new PdfShading.Axial(new PdfDeviceCs.Rgb(), 0, pageSize.GetHeight() - 30, DeviceRgb.WHITE.GetColorValue(), pageSize.GetWidth(), pageSize.GetHeight() - 30, new DeviceRgb(190, 230, 255).GetColorValue());
}
else
{
// Align right in odd number page, which page NO. is a even |奇数页右对齐(页码为偶数)
footerTextPos[0] = pageSize.GetWidth() - Convert.ToSingle(footer["left"]) - 24.0f;
footerTextPos[1] = pageSize.GetBottom() + 19.7f;
footerPageNumPos[0] = pageSize.GetWidth() - Convert.ToSingle(footer["left"]) - 5.5f;
footerPageNumPos[1] = pageSize.GetBottom() + 21.6f;
roundRectPos[0] = pageSize.GetWidth() - Convert.ToSingle(footer["left"]) - 20.0f;
roundRectPos[1] = pageSize.GetBottom() + 22.0f;
alignment = TextAlignment.RIGHT;
axial = new PdfShading.Axial(new PdfDeviceCs.Rgb(), 0, pageSize.GetHeight() - 30, new DeviceRgb(190, 230, 255).GetColorValue(), pageSize.GetWidth(), pageSize.GetHeight() - 30, DeviceRgb.WHITE
.GetColorValue());
}
// Draw gradient background and round corner rect | 渐变背景和圆角矩形
PdfPattern.Shading pattern = new PdfPattern.Shading(axial);
pdfCanvas.SetFillColorShading(pattern)
.Rectangle(0, pageSize.GetBottom() + 14.0f, pageSize.GetWidth(), 24.0f)
.Fill()
.RoundRectangle(roundRectPos[0], roundRectPos[1], 20.0f, 9.0f, 2.0f)
.SetFillColor(new DeviceRgb(18, 98, 170))
.Fill();
// Draw text
canvas.ShowTextAligned(footerText, footerTextPos[0], footerTextPos[1], alignment);
Canvas canvas2 = new Canvas(pdfCanvas, pdf, pageSize);
canvas2.SetFontSize(7.2f);
canvas2.SetFont(pdfFont);
canvas2.SetFontColor(DeviceRgb.WHITE);
// Draw page NO.
canvas2.ShowTextAligned(footerPageNum, footerPageNumPos[0], footerPageNumPos[1], alignment);
}
