Java PdfGState.setFillOpacity方法代码示例

import com.itextpdf.text.pdf.PdfGState; //导入方法依赖的package包/类
@Test
public void testSimple() throws FileNotFoundException, DocumentException
{
    Document document = new Document();
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(new File(RESULT_FOLDER, "transparency.pdf")));
    writer.setCompressionLevel(0);
    document.open();
    PdfContentByte content = writer.getDirectContent();

    content.setRGBColorStroke(0, 255, 0);
    for (int y = 0; y <= 400; y+= 10)
    {
        content.moveTo(0, y);
        content.lineTo(500, y);
    }
    for (int x = 0; x <= 500; x+= 10)
    {
        content.moveTo(x, 0);
        content.lineTo(x, 400);
    }
    content.stroke();

    
    content.saveState();
    PdfGState state = new PdfGState();
    state.setFillOpacity(0.5f);
    content.setGState(state);
    content.setRGBColorFill(255, 0, 0);
    content.moveTo(162, 86);
    content.lineTo(162, 286);
    content.lineTo(362, 286);
    content.lineTo(362, 86);
    content.closePath();
    //content.fillStroke();
    content.fill();
    
    content.restoreState();

    document.close();
}
 

import com.itextpdf.text.pdf.PdfGState; //导入方法依赖的package包/类
private void createPDFFile(String filename) throws FileNotFoundException, DocumentException {
	PNEditorComponent editor = getEditor();
   	PNGraph pnGraph = editor.getGraphComponent().getGraph();

   	JFrame frm = new JFrame();
   	PNGraphComponent forPrint = new PNGraphComponent(pnGraph) {
   	};
   	mxRectangle size = forPrint.getGraph().getGraphBounds();
   	double space = 4;
   	float x = (float) (size.getRectangle().getWidth() + size.getRectangle().getX() + space);
   	float y = (float) (size.getRectangle().getHeight() + size.getRectangle().getY() + space);
   	Document document = new Document(new Rectangle(x, y));
   	PdfWriter writer = null;
   	writer = PdfWriter.getInstance(document, new FileOutputStream(filename));

   	// set crop of pdf doc = ll=lowerleft; ur=upper right
   	float llx = (float) size.getX();
   	float lly = 0;
   	float urx = x;
   	float ury = (float) ((float) size.getRectangle().getHeight() + space*4);
   	com.itextpdf.text.Rectangle crop = new com.itextpdf.text.Rectangle(llx, lly, urx, ury);
   	writer.setCropBoxSize(crop);

   	document.open();

   	PdfContentByte canvas = writer.getDirectContent();

   	// make pdf-background transparent
   	PdfGState gState = new PdfGState();
   	gState.setFillOpacity(0.0f);
   	canvas.setGState(gState);
	
   	forPrint.setGridVisible(false);

   	PdfGraphics2D g2 = new PdfGraphics2D(canvas, x, y);

   	frm.getContentPane().add(forPrint);
   	frm.pack();
   	forPrint.paint(g2);
   	g2.dispose();

   	document.close();
}
 

import com.itextpdf.text.pdf.PdfGState; //导入方法依赖的package包/类
@Override
	protected void doFancyStuff(ActionEvent e) throws Exception {
		setUpGui();
		fch.addChoosableFileFilter(new FileFilter() {
			public String getDescription() {
				return "Portable Network Graphics (*.png)";
			}
			public boolean accept(File f) {
				if (f.isDirectory()) {
					return true;
				} else {
					return f.getName().toLowerCase().endsWith(".png");
				}
			}
		});
		fch.setDialogTitle("Save PNG");
		int returnVal = fch.showDialog(getEditor().getGraphComponent(), "save PNG");
		
		if (returnVal == JFileChooser.APPROVE_OPTION) {
			String filename = fch.getSelectedFile().getAbsolutePath();
			if (!filename.toLowerCase().endsWith(".png"))
				filename += ".png";

			PNEditorComponent editor = getEditor();
			PNGraph pnGraph = editor.getGraphComponent().getGraph();

			
				JFrame frm = new JFrame();
				PNGraphComponent forPrint = new PNGraphComponent(pnGraph) {
				};
				mxRectangle size = forPrint.getGraph().getGraphBounds();
				double space = 4;
				float x = (float) (size.getRectangle().getWidth() + size.getRectangle().getX() + space);
				float y = (float) (size.getRectangle().getHeight() + size.getRectangle().getY() + space);
				Document document = new Document(new Rectangle(x, y));
				PdfWriter writer = null;
				writer = PdfWriter.getInstance(document, new FileOutputStream(filename));

				// set crop of pdf doc = ll=lowerleft; ur=upper right
				float llx = (float) size.getX();
				float lly = 0;
				float urx = x;
				float ury = (float) ((float) size.getRectangle().getHeight() + space);
				com.itextpdf.text.Rectangle crop = new com.itextpdf.text.Rectangle(llx, lly, urx, ury);
				writer.setCropBoxSize(crop);

				document.open();

				PdfContentByte canvas = writer.getDirectContent();

				// make pdf-background transparent
				PdfGState gState = new PdfGState();
				gState.setFillOpacity(0.0f);
				canvas.setGState(gState);
				
				forPrint.setGridVisible(false);

//				PdfGraphics2D g2 = new PdfGraphics2D(canvas, x, y);
				
				BufferedImage b = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB); /* change sizes of course */
				Graphics2D g2 = b.createGraphics();
//				component.print(g);
				
				
				
				frm.getContentPane().add(forPrint);
				frm.pack();
				forPrint.paint(g2);
				ImageIO.write(b,"png",new File(filename));
				g2.dispose();
				document.close();

		}		
	}
 

import com.itextpdf.text.pdf.PdfGState; //导入方法依赖的package包/类
public static void applyWatermarkOnAllPages(
	PdfReader reader, PdfStamper stamper, String text, BaseColor color, float opacity
) throws DocumentException, IOException {
	
	int numberOfPages = reader.getNumberOfPages();
	
	PdfGState gs = new PdfGState();
	gs.setFillOpacity(opacity);

	for (int i = 1; i <= numberOfPages; i++) {
		Rectangle pageSize = reader.getPageSize(i);
		int pageRotation = reader.getPageRotation(i);
		
		boolean isLandscape = false;
		if(pageRotation > 0){
			isLandscape = true;
		}
		
		int pageDiagonalSize = getDiagonalSize(pageSize);
		int watermarkAngle = getDiagonalAngle(pageSize, pageDiagonalSize, isLandscape);
		
		LinkedHashSet<Integer> fontSizeSet = new LinkedHashSet<Integer>();
		float fontSize = determineFontSize(pageDiagonalSize, a4WatermarkFontSize, fontSizeSet);
		fontSize = fontSize - 1;
		
		int cornerPlacement = getCornerPlacementDiagonal(fontSize);
		
		PdfContentByte underContent = stamper.getUnderContent(i);
		underContent.setGState(gs);
		underContent.setFontAndSize(getWaterkmarkFont(), fontSize);
		underContent.setColorFill(color);
		underContent.beginText();
		underContent.showTextAligned(
			Element.ALIGN_BASELINE, text, 
			cornerPlacement/2,
			cornerPlacement/2,
			watermarkAngle
		);
		underContent.endText();
	}
}