如何在Java 2D中画线？
以下代码段显示了如何使用Graphics2D.draw()method绘制一条简单的线。此方法采用实现java.awt.Shape接口的参数。
要画一条线，我们可以使用Line2D.Doublestatic-inner类。该类的构造函数采用四个整数值，分别代表线的起点(x1,y1)和终点(x2,y2)。
package org.nhooo.example.geom;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.Line2D;
public class DrawLine extends JComponent {
@Override
public void paint(Graphics g) {
//使用Graphics2Ddraw()方法绘制一条简单的线。
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(2f));
g2.setColor(Color.RED);
g2.draw(new Line2D.Double(50, 150, 250, 350));
g2.setColor(Color.GREEN);
g2.draw(new Line2D.Double(250, 350, 350, 250));
g2.setColor(Color.BLUE);
g2.draw(new Line2D.Double(350, 250, 150, 50));
g2.setColor(Color.YELLOW);
g2.draw(new Line2D.Double(150, 50, 50, 150));
g2.setColor(Color.BLACK);
g2.draw(new Line2D.Double(0, 0, 400, 400));
}
public static void main(String[] args) {
JFrame frame = new JFrame("Draw Line");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new DrawLine());
frame.pack();
frame.setSize(new Dimension(420, 440));
frame.setVisible(true);
}
}运行代码