Does the PdfGraphics2D support translucent GradientPaints?
(And/or: where should I be looking if I want to engineer this support?)
Below is a simple test case demonstrating that gradients appear to
ignore the opacity of colors.
I'm assuming this boils down to PdfShading.java in the getColorArray()
method, where the alpha channel appears to be dropped. But if I add
the alpha channel back in, then that entry becomes a 4-color array,
which is probably confused with a CMYK array. I haven't found the
entity responsible for decoding this data...
Any pointers/thoughts?
Regards,
- Jeremy
package com.t4l.pdf;
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import com.lowagie.text.Document;
import com.lowagie.text.DocumentException;
import com.lowagie.text.PageSize;
import com.lowagie.text.pdf.PdfContentByte;
import com.lowagie.text.pdf.PdfWriter;
public class TestCase {
public static void main(String[] args) {
try {
TestCase demo = new TestCase();
demo.write();
demo.finish();
} catch(Throwable t) {
t.printStackTrace();
}
}
File tempDest;
Document doc = new Document();
PdfWriter writer;
FileOutputStream out;
public TestCase() throws IOException, DocumentException {
tempDest = new File("deleteme.pdf");
out = new FileOutputStream(tempDest);
writer = PdfWriter.getInstance(doc, out);
writer.setPdfVersion(PdfWriter.VERSION_1_6);
doc.setPageSize(PageSize.A4);
Insets margins = new Insets(36,36,36,36);
doc.setMargins(margins.left, margins.right, margins.top,
margins.bottom);
}
public void write() {
if(doc.isOpen()==false) {
doc.open();
} else {
doc.newPage();
}
PdfContentByte cb = writer.getDirectContent();
Graphics2D g = cb.createGraphics(600, 600);
g.setPaint(new GradientPaint(0,0, new
Color(0,255,0,80),250,250,new
Color(0,0,255,80)));
g.fillRect(0,0,250,250);
g.setPaint(new Color(255,0,0,100));
g.fillRect(250,250,250,250);
g.dispose();
}
public void finish() {
doc.close();
writer.flush();
}
}
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