我正在使用 PotraceJ（potrace库的 java 版本） - 请注意，potrace 用于图像的矢量化。
情况 - potrace 跟踪图像，并将结果存储在 BufferedImage 中，然后将其作为 ImageIcon 显示在 JPanel 中。
我的问题 - 我想将这个 BufferedImage 保存为一个文件，比如 vector.svg 使用 ImageIO.write() 我试过了，但是当我这样做时没有创建文件。可能的原因可能是 Java 的图像编写者可能不会写 svg
我必须将此矢量化图像存储为 svg 文件。我该怎么做？
这里嵌入了主要对光栅图像进行矢量化的代码。虽然您可以在github上找到整个库。
package potracej.src;
import potracej.src.compat.ConvertToJavaCurves;
import potracej.src.compat.PathElement;
import potracej.src.potracej.Bitmap;
import potracej.src.potracej.PoTraceJ;
import potracej.src.potracej.param_t;
import potracej.src.potracej.path_t;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.metal.MetalButtonUI;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.GeneralPath;
import java.awt.image.BufferedImage;
import java.awt.image.WritableRaster;
import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.HashSet;
/**
* Created with IntelliJ IDEA.
* User: san
* Date: 6/10/12
* Time: 12:55 PM
* To change this template use File | Settings | File Templates.
*/
public class Main {
static BufferedImage result;
static Bitmap bmp;
static param_t param = new param_t();
static double scale = 1;
static ImageIcon resultIcon;
static ImageIcon srcIcon;
static BufferedImage sourceImage;
static boolean renderSourceImage = false;
public static void main(String[] args) throws IOException {
Path p = Paths.get(new File(".").getCanonicalPath()+"/potracej/girl.png");
sourceImage = ImageIO.read(p.toFile());
//Toolkit.getDefaultToolkit().
WritableRaster raster = sourceImage.getRaster();
int[] iarr = new int[4];
bmp = new Bitmap((int)(sourceImage.getWidth()), (int)(sourceImage.getHeight()));
for(int y=0; y<sourceImage.getHeight(); y++) {
for(int x=0; x<sourceImage.getWidth(); x++) {
int[] pixel = raster.getPixel(x, y, iarr);
if (pixel[0] + pixel[1] + pixel[2] + pixel[3] != 0) {
bmp.put(x, y, 1);
}
}
}
BufferedImage d2 = new BufferedImage((int) (scale * sourceImage.getWidth()), (int)(scale * sourceImage.getHeight()), BufferedImage.TYPE_INT_ARGB);
Graphics2D d2g = (Graphics2D) d2.getGraphics();
d2g.scale(scale, scale);
d2g.drawImage(sourceImage, 0, 0, null);
d2g.dispose();
sourceImage.flush();
srcIcon = new ImageIcon(d2);
doTrace(scale);
JFrame frame = new JFrame("Result") {
{
setLayout(new BorderLayout());
resultIcon = new ImageIcon(result, "Result");
JButton resultButton = new JButton(resultIcon);
resultButton.setUI(new MetalButtonUI() {
@Override
protected void paintButtonPressed(Graphics g, AbstractButton b) {
//
}
});
add(resultButton, BorderLayout.CENTER);
resultButton.setPressedIcon(srcIcon);
JPanel stuff = new JPanel();
add(stuff, BorderLayout.NORTH);
stuff.setLayout(new GridLayout(4, 2));
stuff.add(new JLabel("Suppress speckles"));
final JSlider turdSlider = new JSlider(JSlider.HORIZONTAL, 0, 100, param.turdsize);
stuff.add(turdSlider);
turdSlider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
param.turdsize = turdSlider.getValue();
doRetrace();
}
});
stuff.add(new JLabel("Smooth corners"));
final JSlider smoothSlider = new JSlider(JSlider.HORIZONTAL, 0, 300, (int) (param.opttolerance * 100));
stuff.add(smoothSlider);
smoothSlider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
param.opttolerance = smoothSlider.getValue() / 100.0;
doRetrace();
}
});
stuff.add(new JLabel("Optimize paths"));
final JSlider optSlider = new JSlider(JSlider.HORIZONTAL, 0, 125, (int) (param.alphamax * 100));
stuff.add(optSlider);
optSlider.addChangeListener(new ChangeListener() {
@Override
public void stateChanged(ChangeEvent e) {
param.alphamax = optSlider.getValue()/100.0;
doRetrace();
}
});
final JCheckBox renderSource = new JCheckBox("Render source");
stuff.add(renderSource);
renderSource.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
renderSourceImage = renderSource.getModel().isArmed();
doRetrace();
}
});
}
private void doRetrace() {
doTrace(scale);
resultIcon.setImage(result);
repaint();
}
};
frame.pack();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.setVisible(true);
}
private static void doTrace(double scale) {
PoTraceJ poTraceJ = new PoTraceJ(param);
long l = System.currentTimeMillis();
path_t trace = null;
for(int i=0; i<10; i++) {
trace = poTraceJ.trace(bmp);
Thread.yield();
}
poTraceJ.resetTimers();
for(int i=0; i<100; i++) {
trace = poTraceJ.trace(bmp);
}
poTraceJ.printTimers();
l = System.currentTimeMillis() - l;
System.out.println("L="+l);
ArrayList<PathElement> al = new ArrayList<PathElement>();
ConvertToJavaCurves.convert(trace, new HashSet<ConvertToJavaCurves.Point>(), al);
if (result != null)
result.flush();
result = new BufferedImage((int)(scale * bmp.getWidth()), (int)(scale * bmp.getHeight()), BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = (Graphics2D)result.getGraphics();
g2.scale(scale, scale);
g2.setColor(Color.WHITE);
g2.fillRect(0, 0, bmp.getWidth(), bmp.getHeight());
g2.setColor(Color.BLACK);
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
GeneralPath path = new GeneralPath();
for (PathElement pathElement : al) {
switch (pathElement.getType()) {
case CLOSE_PATH:
path.closePath();
break;
case LINE_TO:
path.lineTo(pathElement.getP0x(), pathElement.getP0y());
break;
case MOVE_TO:
path.moveTo(pathElement.getP0x(), pathElement.getP0y());
break;
case CURVE_TO:
path.curveTo(pathElement.getP0x(), pathElement.getP0y(), pathElement.getP1x(), pathElement.getP1y(), pathElement.getP2x(), pathElement.getP2y());
break;
}
}
g2.setPaint(Color.black);
g2.fill(path);
}
}
提前致谢。