我需要将JPanel(图形)中的内容(形状)转换为SVGGraphics2D对象,以获取使用Apache Batik库生成的svg文件。
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(fg);
// draw Text
g2.drawString("Hello world!", 250, 400);
// draw Line2D.Double
g2.setPaint(orange);
g2.draw(new Line2D.Double(50, 50, 200, 200));
// draw Point2D.Double
g2.setPaint(red);
g2.fill(new Ellipse2D.Double(400, 400, 5, 5));
// draw Rectangle2D.Double
g2.setPaint(magenta);
g2.draw(new Rectangle2D.Double(600, 600, 300, 150));
g2.setPaint(magenta);
g2.draw(new Rectangle2D.Double(300, 300, 300, 150));
// draw Ellipse2D.Double
g2.setPaint(blue);
g2.draw(new Ellipse2D.Double(400, 400, 200, 200));
// draw GeneralPath (polygon)
g2.setPaint(green);
int x1Points[] = {200, 500, 300};
int y1Points[] = {100, 100, 300};
GeneralPath polygon = new GeneralPath(GeneralPath.WIND_EVEN_ODD,
x1Points.length);
polygon.moveTo(x1Points[0], y1Points[0]);
for ( int index = 1; index < x1Points.length; index++ ) {
polygon.lineTo(x1Points[index], y1Points[index]);
}
polygon.closePath();
g2.draw(polygon);
}
public void onlyWrite(){
JFrame f = new JFrame("Shapes Example2");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {System.exit(0);}
});
// Get a DOMImplementation.
DOMImplementation domImpl = GenericDOMImplementation.getDOMImplementation();
// Create an instance of org.w3c.dom.Document.
String svgNS = "http://www.w3.org/2000/svg";
Document document = domImpl.createDocument(svgNS, "svg", null);
SVGGeneratorContext ctx = SVGGeneratorContext.createDefault(document);
ctx.setComment("Generated from Shapes Example2");
//ctx.setEmbeddedFontsOn(true);
// Create an instance of the SVG Generator.
SVGGraphics2D svgGenerator = new SVGGraphics2D(ctx, false);
ShapesExample2 pane = new ShapesExample2();
f.getContentPane().add("Center", pane);
f.pack();
f.setSize(new Dimension(1000,1000));
f.setResizable(false);
f.setVisible(true);
svgGenerator = (SVGGraphics2D)pane.getGraphics();
// Finally, stream out SVG to the standard output using
// UTF-8 encoding.
boolean useCSS = false; // we want to use CSS style attributes
String svgFile = "example2.svg";
try {
OutputStream outputStream = new FileOutputStream(svgFile);
Writer outputStreamWriter = new OutputStreamWriter(outputStream);
svgGenerator.stream(outputStreamWriter, useCSS);
} catch (Exception e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
铸造SVGGraphics2D我得到以下异常:
线程“主”中的异常java.lang.ClassCastException:
sun.java2d.SunGraphics2D无法转换为
org.apache.batik.svggen.SVGGraphics2D位于
ShapesExample2.onlyWrite(ShapesExample2.java:122)位于
ShapesExample2.main(ShapesExample2.java:144)
如何获取svg文件?
谢谢!
最佳答案
换一种方式尝试,SVGGraphics2D
是Graphics2D
的子类,Graphics2D
不是SVGGraphics2D
的子类。
因此,只需将SVG图形对象传递给组件的paint方法即可。
pane.paintComponent(svgGenerator);
您可以在此处查看更多示例:Apache Batik SVG Generator
关于java - 如何使用Apache Batik库在SVGGraphics2D中转换Graphics2D?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/56164645/