java解析SVG图片并进行几何操作

java解析SVG图片
需要用到apache的batik的jar包（1.7或1.8皆可）
getSVGDocument();方法是从当前的JSVGCanvas中获取SVG文档
getRootElement();获取当前文档的根元素
其它元素可通过childNodes()、parent()以及getElementById()、getElementByTagName()等方法获得。
程序源码如下
package paper;

/*
 *  功能：解析svg文件，并对svg文件进行操作
 */

import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.math.BigDecimal;

import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.apache.batik.swing.JSVGCanvas;
import org.apache.batik.swing.gvt.GVTTreeRendererAdapter;
import org.apache.batik.swing.gvt.GVTTreeRendererEvent;
import org.apache.batik.swing.svg.GVTTreeBuilderAdapter;
import org.apache.batik.swing.svg.GVTTreeBuilderEvent;
import org.apache.batik.swing.svg.SVGDocumentLoaderAdapter;
import org.apache.batik.swing.svg.SVGDocumentLoaderEvent;

import org.w3c.dom.Element;
import org.w3c.dom.svg.SVGDocument;
import org.w3c.dom.svg.SVGElement;

public class SVGAnalysis {
public SVGAnalysis(JFrame frame_) {
frame = frame_;
}

public static void main(String[] args) {

JFrame frame = new JFrame("SVG解析");
SVGAnalysis app = new SVGAnalysis(frame);

frame.getContentPane().add(app.createComponents());

frame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
frame.setSize(1024, 700);// 设置窗体大小
Toolkit toolkit = Toolkit.getDefaultToolkit();

int xTemp = (int) (toolkit.getScreenSize().getWidth() - frame.getWidth()) / 2;

int yTemp = (int) (toolkit.getScreenSize().getHeight() - frame.getHeight()) / 2;

frame.setLocation(xTemp, yTemp);
frame.setVisible(true);// 设置窗口可见
}

protected JFrame frame;

protected JButton chooseButton = new JButton("选择图片");
protected JButton bigButton = new JButton("放大");
protected JButton smallButton = new JButton("缩小");
protected JButton rotateButton = new JButton("旋转");
protected JButton rightButton = new JButton("右移");
protected JButton downButton = new JButton("下移");
protected JButton leftButton = new JButton("左移");
protected JButton upButton = new JButton("上移");
protected JButton deleteButton = new JButton("删除图片");
protected JButton saveButton = new JButton("保存图片");

protected JLabel label = new JLabel();

protected JSVGCanvas svgCanvas = new JSVGCanvas();
SVGDocument svgDocument;// SVGDocument实例
SVGElement svgRoot;// SVGElement实例
Element ele;// 通过ID获得的元素
double xaxis = 1;// 初始化x轴放大倍数
double yaxis = 1;// 初始化y轴放大倍数
float rotateAngle = 0;// 旋转角度
int xIndex = 0;// 横坐标
int yIndex = 0;// 纵坐标



public JComponent createComponents() {

final JPanel panel = new JPanel(new BorderLayout());
JPanel panel_ = new JPanel(new FlowLayout(FlowLayout.LEFT));

panel_.add(chooseButton);
panel_.add(bigButton);
panel_.add(smallButton);
panel_.add(rotateButton);
panel_.add(upButton);
panel_.add(downButton);
panel_.add(leftButton);
panel_.add(rightButton);
panel_.add(label);
panel_.add(deleteButton);
panel_.add(saveButton);
panel.add("North", panel_);
panel.add("Center", svgCanvas);

// 获取点击事件的横纵坐标
svgCanvas.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent e) {
System.out.println(e.getX() + "  " + e.getY());
System.out.println(e.getLocationOnScreen());
System.out.println(svgCanvas.getAlignmentX());
svgCanvas.getAlignmentX();
xIndex = e.getX();
yIndex = e.getY();
}
});

// 选择图片并加载
chooseButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JFileChooser fc = new JFileChooser(".");
int choice = fc.showOpenDialog(panel);
if (choice == JFileChooser.APPROVE_OPTION) {
File f = fc.getSelectedFile();
try {
svgCanvas.setURI(f.toURL().toString());
} catch (IOException e) {
e.printStackTrace();
}
}
}
});


// 删除图片
deleteButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
svgDocument = svgCanvas.getSVGDocument();
svgRoot = svgDocument.getRootElement();
svgRoot.removeChild(ele);
svgCanvas.setSVGDocument(svgDocument);
}
});

// 保存图片
saveButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
JFileChooser jfc = new JFileChooser();
jfc.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
jfc.showDialog(new JLabel(), "保存文件");
File file = jfc.getSelectedFile();
svgDocument = svgCanvas.getSVGDocument();
TransformerFactory tfac = TransformerFactory.newInstance();
try {
Transformer tra = tfac.newTransformer();
DOMSource doms = new DOMSource(svgDocument);
FileOutputStream outstream = new FileOutputStream(file);
StreamResult sr = new StreamResult(outstream);
tra.transform(doms, sr);
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
}

}
});

/**
 * 通过ID单独对某一个图形单独进行放大、缩小、旋转、平移等操作
 */
// 放大
bigButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
double times = 0.2;// 设置增大倍数
xaxis = xaxis + times;
yaxis = yaxis + times;
svgDocument = svgCanvas.getSVGDocument();
ele.setAttribute("transform", "scale(" + xaxis + ',' + yaxis + ")");
svgCanvas.setSVGDocument(svgDocument);
}
});
// 缩小
smallButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
double times = 0.2;// 设置缩小倍数
xaxis = xaxis - times;
yaxis = yaxis - times;
svgDocument = svgCanvas.getSVGDocument();
ele.setAttribute("transform", "scale(" + xaxis + "," + yaxis + ")");
svgCanvas.setSVGDocument(svgDocument);

}
});
// (旋转（不设置旋转中心默认以左上角为原点旋转）
rotateButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
int degree = 15;// 设置旋转角度
String center = " 220 220)";// 设置旋转中心
rotateAngle = rotateAngle + degree;
svgDocument = svgCanvas.getSVGDocument();
ele.setAttribute("transform", "rotate(" + rotateAngle + center);
svgCanvas.setSVGDocument(svgDocument);

}
});
// 左移
leftButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
int move = 50;// 设置左移距离
xIndex = xIndex - move;
svgDocument = svgCanvas.getSVGDocument();
ele.setAttribute("transform", "translate(" + xIndex + "," + yIndex + ")");
svgCanvas.setSVGDocument(svgDocument);
}
});
// 右移
rightButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
int move = 50;// 设置右移距离
xIndex = xIndex + move;
svgDocument = svgCanvas.getSVGDocument();
ele.setAttribute("transform", "translate(" + xIndex + "," + yIndex + ")");
svgCanvas.setSVGDocument(svgDocument);
}
});
// 上移
upButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
int move = 0;// 设置上移距离
yIndex = yIndex - move;
svgDocument = svgCanvas.getSVGDocument();
ele.setAttribute("transform", "translate(" + xIndex + "," + yIndex + ")");
svgCanvas.setSVGDocument(svgDocument);
}
});
// 下移
downButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
int move = 30;// 设置下移距离
yIndex = yIndex + move;
svgDocument = svgCanvas.getSVGDocument();
ele.setAttribute("transform", "translate(" + xIndex + "," + yIndex + ")");
svgCanvas.setSVGDocument(svgDocument);
}
});

// 设置JSVGCanvas监听器
svgCanvas.addSVGDocumentLoaderListener(new SVGDocumentLoaderAdapter() {
public void documentLoadingStarted(SVGDocumentLoaderEvent e) {
label.setText("图片加载中...");
}

public void documentLoadingCompleted(SVGDocumentLoaderEvent e) {
label.setText("图片加载完成!");
svgDocument = svgCanvas.getSVGDocument();
// 根据ID绑定元素!!!(我图片的元素ID为SVGDemo)
// 根据ID绑定元素!!!(我图片的元素ID为SVGDemo)
// 根据ID绑定元素!!!(我图片的元素ID为SVGDemo)
ele = svgDocument.getElementById("SVGDemo");
}
});

svgCanvas.addGVTTreeBuilderListener(new GVTTreeBuilderAdapter() {
public void gvtBuildStarted(GVTTreeBuilderEvent e) {
label.setText("开始载入...");
}

public void gvtBuildCompleted(GVTTreeBuilderEvent e) {
label.setText("载入成功!");
frame.pack();
}
});

svgCanvas.addGVTTreeRendererListener(new GVTTreeRendererAdapter() {
public void gvtRenderingPrepare(GVTTreeRendererEvent e) {
label.setText("打底开始...");
}

public void gvtRenderingCompleted(GVTTreeRendererEvent e) {
label.setText("图片编辑中...");
}
});

return panel;
}

}