如何在Java 2D中绘制GeneralPath？
package org.nhooo.example.geom;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.GeneralPath;
public class DrawGeneralPath extends JComponent {
@Override
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(4.0f));
g2.setPaint(Color.GREEN);
int[] xPoints = {10, 50, 100, 150, 200, 250, 300, 350};
int[] yPoints = {10, 50, 10, 50, 10, 50, 10, 50};
GeneralPath path = new GeneralPath(GeneralPath.WIND_EVEN_ODD,
xPoints.length);
//通过移动到指定点将点添加到路径
//坐标。
path.moveTo(xPoints[0], yPoints[0]);
for (int i = 1; i < xPoints.length; i++) {
//通过绘制直线将点添加到路径
//从当前位置到指定位置的线
//坐标。
path.lineTo(xPoints[i], yPoints[i]);
}
path.curveTo(150, 150, 300, 300, 50, 250);
path.closePath();
g2.draw(path);
//画另一条路，开始
g2.setPaint(Color.RED);
g2.setStroke(new BasicStroke(2.0f));
path = new GeneralPath(GeneralPath.WIND_NON_ZERO);
path.moveTo(200, 50);
path.lineTo(270, 300);
path.lineTo(100, 120);
path.lineTo(300, 120);
path.lineTo(130, 300);
path.closePath();
g2.draw(path);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Draw GeneralPath Demo");
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.getContentPane().add(new DrawGeneralPath());
frame.pack();
frame.setSize(new Dimension(420, 400));
frame.setVisible(true);
}
}运行代码段
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