Java Component.print方法代码示例

import java.awt.Component; //导入方法依赖的package包/类
private void exportVectorGraphics(String formatName, File outputFile) throws ImageExportException {
	Component component = printableComponent.getExportComponent();
	int width = component.getWidth();
	int height = component.getHeight();
	try (FileOutputStream fs = new FileOutputStream(outputFile)) {
		switch (formatName) {
			case PDF:
				// create pdf document with slightly increased width and height
				// (otherwise the image gets cut off)
				Document document = new Document(new Rectangle(width + 5, height + 5));
				PdfWriter writer = PdfWriter.getInstance(document, fs);
				document.open();
				PdfContentByte cb = writer.getDirectContent();
				PdfTemplate tp = cb.createTemplate(width, height);
				Graphics2D g2 = tp.createGraphics(width, height, new DefaultFontMapper());
				component.print(g2);
				g2.dispose();
				cb.addTemplate(tp, 0, 0);
				document.close();
				break;
			case SVG:
				exportFreeHep(component, fs, new SVGGraphics2D(fs, new Dimension(width, height)));
				break;
			case EPS:
				exportFreeHep(component, fs, new PSGraphics2D(fs, new Dimension(width, height)));
				break;
			default:
				// cannot happen
				break;
		}
	} catch (Exception e) {
		throw new ImageExportException(I18N.getMessage(I18N.getUserErrorMessagesBundle(),
				"error.image_export.export_failed"), e);
	}
}
 

import java.awt.Component; //导入方法依赖的package包/类
/**
 * Paints the current state (i.e. the state corresponding to the current
 * phase) of the given component.
 *
 * @param g graphics context.
 * @param comp component to paint.
 */
private void paintComponent(Graphics g, Component comp) {
    Rectangle bounds = currentBounds(comp);
    float alpha = currentAlpha(comp);
    Graphics gg = g.create(bounds.x, bounds.y, bounds.width, bounds.height);
    if (alpha != 1f) {
        AlphaComposite alphaComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha);
        ((Graphics2D)gg).setComposite(alphaComposite);
    }
    comp.setBounds(bounds);
    comp.validate();
    // Intentionally using print instead of paint.
    // Print doesn't use double buffering and it solves some mysterious
    // problems with modified clip during painting of containers.
    // BTW: animated transitions library also uses print()
    if (comp instanceof JComponent) {
        comp.print(gg);
    } else {
        java.awt.peer.ComponentPeer peer = FakePeerSupport.getPeer(comp);
        if (peer != null) {
            peer.paint(gg);
        }
    }
    gg.dispose();
}
 

import java.awt.Component; //导入方法依赖的package包/类
private void exportFreeHep(Component component, FileOutputStream fs, VectorGraphics vg) {
	vg.startExport();
	component.print(vg);
	vg.endExport();
	vg.dispose();
}