DynaPDF Manual - Page 94

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Path Painting and Construction

Page 94 of 883

pdfSetOnErrorProc(pdf, NULL, PDFError);

pdfSetDocInfo(pdf, diAuthor, "Jens Boschulte");

pdfSetDocInfo(pdf, diCreator, "C sample project");

pdfSetDocInfo(pdf, diSubject, "How to use clipping paths");

pdfSetDocInfo(pdf, diTitle, "Clipping paths");

pdfSetViewerPreferences(pdf, vpDisplayDocTitle, avNone);

pdfCreateNewPDF(pdf, "c:/cppout.pdf");

pdfSetPageCoords(pdf, pcTopDown);

pdfAppend(pdf);

// Nonzero Winding Number Rule

DrawPath(pdf, 0, 0, cmWinding, ddCounterClockwise, PDF_SKYBLUE);

DrawPath(pdf, 110, 0, cmWinding, ddClockwise, PDF_SKYBLUE);

// Even Odd Rule

DrawPath(pdf, 220, 0, cmEvenOdd, ddCounterClockwise, PDF_YELLOW);

DrawPath(pdf, 330, 0, cmEvenOdd, ddClockwise, PDF_YELLOW);

pdfEndPage(pdf);

pdfCloseFile(pdf);

pdfDeletePDF(pdf);

}

Winding

Even-Odd

C P C P C P C P

A clipping path is part of the graphics state. The only way to disable a clipping path is to restore

the graphics state. If the graphics state was not saved beforehand it is impossible to deactivate

the clipping region.

If a second clipping path is drawn while another one is still active then it will be intersected

with the current clipping path. The clipping area of the intersected clipping paths is never larger

than the initial clipping path.

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