网站开发与管理,郴州本地网站建设,火烈鸟门户网站开发,友情链接样式8-1使用按钮选择绘制不同图形
编写一个程序#xff0c;实现如下的界面#xff0c;当点击不同按钮时绘制相应的图形。点击“椭圆”#xff0c;绘制一个椭圆形#xff1b;点击“矩形”#xff0c;绘制一个矩形#xff1b;点击“直线”#xff0c;绘制一条直线。实现图形绘…8-1使用按钮选择绘制不同图形
编写一个程序实现如下的界面当点击不同按钮时绘制相应的图形。点击“椭圆”绘制一个椭圆形点击“矩形”绘制一个矩形点击“直线”绘制一条直线。实现图形绘制即可图形位置和大小自定。 参考代码
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import java.awt.geom.Rectangle2D;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class b{public static void main(String[] args) {EventQueue.invokeLater(new Runnable() {public void run() {ChangeGraphFrame frame new ChangeGraphFrame();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setVisible(true);}});}
}
class ChangeGraphFrame extends JFrame {private GraphComponent graphComponent;public ChangeGraphFrame() {setSize(250, 200);setTitle(绘制图形);graphComponent new GraphComponent();add(graphComponent, BorderLayout.CENTER);JButton elipseButton new JButton(椭圆);elipseButton.addActionListener(new ChangeGraphAction(1));JButton rectButton new JButton(矩形);rectButton.addActionListener(new ChangeGraphAction(2));JButton lineButton new JButton(直线);lineButton.addActionListener(new ChangeGraphAction(3));JPanel buttonPanel new JPanel();buttonPanel.add(elipseButton);buttonPanel.add(rectButton);buttonPanel.add(lineButton);add(buttonPanel, BorderLayout.SOUTH);
}
private class ChangeGraphAction implements ActionListener {private int choice;public ChangeGraphAction(int choice) {this.choice choice;}public void actionPerformed(ActionEvent event) {graphComponent.setGraphChoice(choice);repaint();}}
}class GraphComponent extends JComponent {private int graphChoice 0;public int getGraphChoice() {return graphChoice;}public void setGraphChoice(int graphChoice) {this.graphChoice graphChoice;}public void paintComponent(Graphics g) {Graphics2D g2 (Graphics2D) g;Ellipse2D elipse new Ellipse2D.Double(70, 10, 100, 100);Rectangle2D rect new Rectangle2D.Double(70, 10, 100, 100);Line2D line new Line2D.Double(10, 10, 200, 100);switch (graphChoice) {case 1:g2.draw(elipse);break;case 2:g2.draw(rect);break;case 3:g2.draw(line);break;}}
}
