Am 10.11.2016 um 10:46 schrieb clifford:
This is my problem:-
PDPage page = new PDPage();
PDColorSpace cs =
PDColorSpace.create(COSName.PATTERN,page.getResources());
//or even dose not matter which one you choose
//PDColorSpace cs = new PDPattern(null, PDDeviceRGB.INSTANCE);
page.getResources().put(COSName.getPDFName("R9"), cs);
If you didn't set any resources for your PDPage object, then it will
indeed be null.
add this:
page.setResources(new PDResources());
COSName cn = page.getResources().add(cs);
The above code is just to prove there is a bug, and I do not do this.
from the above code:-
cn should equal "R9" is dose not it equals "cs2". And there is another
resource item added.
I get R9 with this code:
public class NewClass
{
public static void main(String[] args) throws IOException
{
PDPage page = new PDPage();
page.setResources(new PDResources());
PDColorSpace cs = PDColorSpace.create(COSName.PATTERN,
page.getResources());
page.getResources().put(COSName.getPDFName("R9"), cs);
COSName cn = page.getResources().add(cs);
System.out.println(cn);
}
}
so please try that code, and with the latest PDFBox version from the
snapshot site.
But you should really use the example code I created. Run it and you'll
see that you'll get a PDF with patterns.
The name doesn't matter. What matters is whether it does what you need
or not.
when using class PDPageContentStream and calling method public void
setNonStrokingColor(PDColor color) throws IOException
with PDColor having it colour space set too cs from the above code
inside setNonStrokingColor it calls getName against the colour space
for PDColor and inside getName it dose the equivalent of the last line
of code from above
so the code it writes to the PDF file is
q
/cs2 cs
0.6 0.89804 0.6 /Patten1 scn
402.00864 419.82635 68.9668 16.31381 re
f
Q
which is wrong as it should be
q
/R9 cs
0.6 0.89804 0.6 /Patten1 scn
402.00864 419.82635 68.9668 16.31381 re
f
Q
inside class PDResources method public COSName add(PDColorSpace
colorSpace) calls private COSName add(COSName kind, String prefix,
COSObjectable object) and in this method there is a line if (dict !=
null && dict.containsValue(object.getCOSObject()))
the object is the original cs (PDColorSpace from above code) and it
dose is not find a result for getCOSObject() which is the COSArray
with the COSName.PATTERN in it.
that all looks ok to me... the "put" inserts it into the dictionary with
a specific name, and the "add" adds it again without specifying a key,
and finds that it is already there.
Here's the latest and ultimate example, which I will commit:
import java.io.IOException;
import java.io.OutputStream;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpace;
import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceRGB;
import org.apache.pdfbox.pdmodel.graphics.color.PDPattern;
import org.apache.pdfbox.pdmodel.graphics.pattern.PDTilingPattern;
import org.apache.pdfbox.util.Charsets;
/**
* This is an example of how to create a page that uses patterns to
paint areas.
*
* @author Tilman Hausherr
*/
public class CreatePatternsPDF
{
public static void main(String[] args) throws IOException
{
PDDocument doc = new PDDocument();
PDPage page = new PDPage();
doc.addPage(page);
page.setResources(new PDResources());
PDPageContentStream pcs = new PDPageContentStream(doc, page);
// Colored pattern, i.e. the pattern content stream will set
its own color(s)
PDColorSpace patternCS1 = new PDPattern(null,
PDDeviceRGB.INSTANCE);
// Table 75 spec
PDTilingPattern tilingPattern1 = new PDTilingPattern();
tilingPattern1.setBBox(new PDRectangle(0, 0, 10, 10));
tilingPattern1.setPaintType(PDTilingPattern.PAINT_COLORED);
tilingPattern1.setTilingType(PDTilingPattern.TILING_CONSTANT_SPACING);
tilingPattern1.setXStep(10);
tilingPattern1.setYStep(10);
COSName patternName1 = page.getResources().add(tilingPattern1);
//TODO
// there's no way to create something like a PDPageContentStream,
// so we'll do it the hard way
OutputStream os1 =
tilingPattern1.getContentStream().createOutputStream();
// Set color, draw diagonal line + 2 more diagonals so that
corners look good
os1.write("1 0 0 RG 0 0 m 10 10 l -1 9 m 1 11 l 9 -1 m 11 1 l
s".getBytes(Charsets.US_ASCII));
os1.close();
PDColor patternColor1 = new PDColor(patternName1, patternCS1);
pcs.addRect(50, 500, 200, 200);
pcs.setNonStrokingColor(patternColor1);
pcs.fill();
// Uncolored pattern - the color is passed later
PDTilingPattern tilingPattern2 = new PDTilingPattern();
tilingPattern2.setBBox(new PDRectangle(0, 0, 10, 10));
tilingPattern2.setPaintType(PDTilingPattern.PAINT_UNCOLORED);
tilingPattern2.setTilingType(PDTilingPattern.TILING_NO_DISTORTION);
tilingPattern2.setXStep(10);
tilingPattern2.setYStep(10);
COSName patternName2 = page.getResources().add(tilingPattern2);
OutputStream os2 =
tilingPattern2.getContentStream().createOutputStream();
// draw a cross
os2.write("0 5 m 10 5 l 5 0 m 5 10 l
s".getBytes(Charsets.US_ASCII));
os2.close();
// Uncolored pattern colorspace needs to know the colorspace
// for the color values that will be passed when painting the fill
PDColorSpace patternCS2 = new PDPattern(null,
PDDeviceRGB.INSTANCE);
PDColor patternColor2green = new PDColor(
new float[]{0,1,0},
patternName2,
patternCS2);
pcs.addRect(300, 500, 100, 100);
pcs.setNonStrokingColor(patternColor2green);
pcs.fill();
// same pattern again but with different color + different
pattern start position
PDColor patternColor2blue = new PDColor(
new float[]{0,0,1},
patternName2,
patternCS2);
pcs.addRect(455, 505, 100, 100);
pcs.setNonStrokingColor(patternColor2blue);
pcs.fill();
pcs.close();
doc.save("patterns.pdf");
doc.close();
}
}
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