Java Code Examples for org.apache.pdfbox.pdmodel.graphics.state.PDExtendedGraphicsState#setNonStrokingAlphaConstant()

void setOpacity(PDAppearanceContentStream contentStream, float opacity) throws IOException
{
    if (opacity < 1)
    {
        PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
        gs.setStrokingAlphaConstant(opacity);
        gs.setNonStrokingAlphaConstant(opacity);

        contentStream.setGraphicsStateParameters(gs);
    }
}
 

private void drawCircles(PDAnnotationText annotation, final PDAppearanceContentStream contentStream)
        throws IOException
{
    PDRectangle bbox = adjustRectAndBBox(annotation, 20, 20);

    // strategy used by Adobe:
    // 1) add small circle in white using /ca /CA 0.6 and width 1
    // 2) fill
    // 3) add small circle in one direction
    // 4) add large circle in other direction
    // 5) stroke + fill
    // with square width 20 small r = 6.36, large r = 9.756

    float smallR = 6.36f;
    float largeR = 9.756f;

    contentStream.setMiterLimit(4);
    contentStream.setLineJoinStyle(1);
    contentStream.setLineCapStyle(0);
    contentStream.saveGraphicsState();
    contentStream.setLineWidth(1);
    PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
    gs.setAlphaSourceFlag(false);
    gs.setStrokingAlphaConstant(0.6f);
    gs.setNonStrokingAlphaConstant(0.6f);
    gs.setBlendMode(BlendMode.NORMAL);
    contentStream.setGraphicsStateParameters(gs);
    contentStream.setNonStrokingColor(1f);
    drawCircle(contentStream, bbox.getWidth() / 2, bbox.getHeight() / 2, smallR);
    contentStream.fill();
    contentStream.restoreGraphicsState();

    contentStream.setLineWidth(0.59f); // value from Adobe
    drawCircle(contentStream, bbox.getWidth() / 2, bbox.getHeight() / 2, smallR);
    drawCircle2(contentStream, bbox.getWidth() / 2, bbox.getHeight() / 2, largeR);
    contentStream.fillAndStroke();
}
 

private void drawHelp(PDAnnotationText annotation, final PDAppearanceContentStream contentStream)
        throws IOException
{
    PDRectangle bbox = adjustRectAndBBox(annotation, 20, 20);

    float min = Math.min(bbox.getWidth(), bbox.getHeight());

    contentStream.setMiterLimit(4);
    contentStream.setLineJoinStyle(1);
    contentStream.setLineCapStyle(0);
    contentStream.setLineWidth(0.59f); // value from Adobe

    // Adobe first fills a white circle with CA ca 0.6, so do we
    contentStream.saveGraphicsState();
    contentStream.setLineWidth(1);
    PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
    gs.setAlphaSourceFlag(false);
    gs.setStrokingAlphaConstant(0.6f);
    gs.setNonStrokingAlphaConstant(0.6f);
    gs.setBlendMode(BlendMode.NORMAL);
    contentStream.setGraphicsStateParameters(gs);
    contentStream.setNonStrokingColor(1f);
    drawCircle2(contentStream, min / 2, min / 2, min / 2 - 1);
    contentStream.fill();
    contentStream.restoreGraphicsState();

    contentStream.saveGraphicsState();
    // rescale so that "?" fits into circle and move "?" to circle center
    // values gathered by trial and error
    contentStream.transform(Matrix.getScaleInstance(0.001f * min / 2.25f, 0.001f * min / 2.25f));
    contentStream.transform(Matrix.getTranslateInstance(500, 375));

    // we get the shape of an Helvetica bold "?" and use that one.
    // Adobe uses a different font (which one?), or created the shape from scratch.
    GeneralPath path = PDType1Font.HELVETICA_BOLD.getPath("question");
    addPath(contentStream, path);
    contentStream.restoreGraphicsState();
    // draw the outer circle counterclockwise to fill area between circle and "?"
    drawCircle2(contentStream, min / 2, min / 2, min / 2 - 1);
    contentStream.fillAndStroke();
}
 

private void drawParagraph(PDAnnotationText annotation, final PDAppearanceContentStream contentStream)
        throws IOException
{
    PDRectangle bbox = adjustRectAndBBox(annotation, 20, 20);

    float min = Math.min(bbox.getWidth(), bbox.getHeight());

    contentStream.setMiterLimit(4);
    contentStream.setLineJoinStyle(1);
    contentStream.setLineCapStyle(0);
    contentStream.setLineWidth(0.59f); // value from Adobe

    // Adobe first fills a white circle with CA ca 0.6, so do we
    contentStream.saveGraphicsState();
    contentStream.setLineWidth(1);
    PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
    gs.setAlphaSourceFlag(false);
    gs.setStrokingAlphaConstant(0.6f);
    gs.setNonStrokingAlphaConstant(0.6f);
    gs.setBlendMode(BlendMode.NORMAL);
    contentStream.setGraphicsStateParameters(gs);
    contentStream.setNonStrokingColor(1f);
    drawCircle2(contentStream, min / 2, min / 2, min / 2 - 1);
    contentStream.fill();
    contentStream.restoreGraphicsState();

    contentStream.saveGraphicsState();
    // rescale so that "?" fits into circle and move "?" to circle center
    // values gathered by trial and error
    contentStream.transform(Matrix.getScaleInstance(0.001f * min / 3, 0.001f * min / 3));
    contentStream.transform(Matrix.getTranslateInstance(850, 900));

    // we get the shape of an Helvetica "?" and use that one.
    // Adobe uses a different font (which one?), or created the shape from scratch.
    GeneralPath path = PDType1Font.HELVETICA.getPath("paragraph");
    addPath(contentStream, path);
    contentStream.restoreGraphicsState();
    contentStream.fillAndStroke();
    drawCircle(contentStream, min / 2, min / 2, min / 2 - 1);
    contentStream.stroke();
}
 

private void drawRightArrow(PDAnnotationText annotation, final PDAppearanceContentStream contentStream)
        throws IOException
{
    PDRectangle bbox = adjustRectAndBBox(annotation, 20, 20);

    float min = Math.min(bbox.getWidth(), bbox.getHeight());

    contentStream.setMiterLimit(4);
    contentStream.setLineJoinStyle(1);
    contentStream.setLineCapStyle(0);
    contentStream.setLineWidth(0.59f); // value from Adobe

    // Adobe first fills a white circle with CA ca 0.6, so do we
    contentStream.saveGraphicsState();
    contentStream.setLineWidth(1);
    PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
    gs.setAlphaSourceFlag(false);
    gs.setStrokingAlphaConstant(0.6f);
    gs.setNonStrokingAlphaConstant(0.6f);
    gs.setBlendMode(BlendMode.NORMAL);
    contentStream.setGraphicsStateParameters(gs);
    contentStream.setNonStrokingColor(1f);
    drawCircle2(contentStream, min / 2, min / 2, min / 2 - 1);
    contentStream.fill();
    contentStream.restoreGraphicsState();

    contentStream.saveGraphicsState();
    // rescale so that the glyph fits into circle and move it to circle center
    // values gathered by trial and error
    contentStream.transform(Matrix.getScaleInstance(0.001f * min / 1.3f, 0.001f * min / 1.3f));
    contentStream.transform(Matrix.getTranslateInstance(200, 300));

    // we get the shape of a Zapf Dingbats right arrow (0x2794) and use that one.
    // Adobe uses a different font (which one?), or created the shape from scratch.
    GeneralPath path = PDType1Font.ZAPF_DINGBATS.getPath("a160");
    addPath(contentStream, path);
    contentStream.restoreGraphicsState();
    // surprisingly, this one not counterclockwise.
    drawCircle(contentStream, min / 2, min / 2, min / 2 - 1);
    contentStream.fillAndStroke();
}
 

private void drawComment(PDAnnotationText annotation, final PDAppearanceContentStream contentStream)
             throws IOException
{
    adjustRectAndBBox(annotation, 18, 18);

    contentStream.setMiterLimit(4);
    contentStream.setLineJoinStyle(1);
    contentStream.setLineCapStyle(0);
    contentStream.setLineWidth(200);

    // Adobe first fills a white rectangle with CA ca 0.6, so do we
    contentStream.saveGraphicsState();
    contentStream.setLineWidth(1);
    PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
    gs.setAlphaSourceFlag(false);
    gs.setStrokingAlphaConstant(0.6f);
    gs.setNonStrokingAlphaConstant(0.6f);
    gs.setBlendMode(BlendMode.NORMAL);
    contentStream.setGraphicsStateParameters(gs);
    contentStream.setNonStrokingColor(1f);
    contentStream.addRect(0.3f, 0.3f, 18-0.6f, 18-0.6f);
    contentStream.fill();
    contentStream.restoreGraphicsState();

    contentStream.transform(Matrix.getScaleInstance(0.003f, 0.003f));
    contentStream.transform(Matrix.getTranslateInstance(500, -300));

    // outer shape was gathered from Font Awesome by "printing" comment.svg
    // into a PDF and looking at the content stream
    contentStream.moveTo(2549, 5269);
    contentStream.curveTo(1307, 5269, 300, 4451, 300, 3441);
    contentStream.curveTo(300, 3023, 474, 2640, 764, 2331);
    contentStream.curveTo(633, 1985, 361, 1691, 357, 1688);
    contentStream.curveTo(299, 1626, 283, 1537, 316, 1459);
    contentStream.curveTo(350, 1382, 426, 1332, 510, 1332);
    contentStream.curveTo(1051, 1332, 1477, 1558, 1733, 1739);
    contentStream.curveTo(1987, 1659, 2261, 1613, 2549, 1613);
    contentStream.curveTo(3792, 1613, 4799, 2431, 4799, 3441);
    contentStream.curveTo(4799, 4451, 3792, 5269, 2549, 5269);
    contentStream.closePath();

    // can't use addRect: if we did that, we wouldn't get the donut effect
    contentStream.moveTo(0.3f / 0.003f - 500, 0.3f / 0.003f + 300);
    contentStream.lineTo(0.3f / 0.003f - 500, 0.3f / 0.003f + 300 + 17.4f / 0.003f);
    contentStream.lineTo(0.3f / 0.003f - 500 + 17.4f / 0.003f, 0.3f / 0.003f + 300 + 17.4f / 0.003f);
    contentStream.lineTo(0.3f / 0.003f - 500 + 17.4f / 0.003f, 0.3f / 0.003f + 300);

    contentStream.closeAndFillAndStroke();
}
 

private void setAlpha(PDPageContentStream cs, float alpha) throws IOException {
	PDExtendedGraphicsState gs = new PDExtendedGraphicsState();
	gs.setNonStrokingAlphaConstant(alpha / OPAQUE_VALUE);
	cs.setGraphicsStateParameters(gs);
}