如何使用GUI绘制线条?(How to draw a line using GUI?)
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小牛编辑
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2023-12-01
问题描述 (Problem Description)
如何使用GUI绘制线条?
解决方案 (Solution)
下面的示例演示如何使用Graphics2D类的draw()方法绘制一条线,并将Line2D对象作为参数。
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.Line2D;
import javax.swing.JApplet;
import javax.swing.JFrame;
public class Main extends JApplet {
public void init() {
setBackground(Color.white);
setForeground(Color.white);
}
public void paint(Graphics g) {
Graphics2D g2 = (Graphics2D) g;
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2.setPaint(Color.gray);
int x = 5;
int y = 7;
g2.draw(new Line2D.Double(x, y, 200, 200));
g2.drawString("Line", x, 250);
}
public static void main(String s[]) {
JFrame f = new JFrame("Line");
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JApplet applet = new Main();
f.getContentPane().add("Center", applet);
applet.init();
f.pack();
f.setSize(new Dimension(300, 300));
f.setVisible(true);
}
}
结果 (Result)
上面的代码示例将产生以下结果。
Line is displayed in a frame.