我正在编写一个程序,当点击鼠标时,将绘制一个圆圈.到目前为止我写的下面的代码.
import java.awt.*; import javax.swing.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.MouseEvent; import java.awt.event.MouseListener; import javax.swing.event.*; import java.awt.geom.*; public class test extends JFrame implements ActionListener,MouseListener { Shape circle = new Ellipse2D.Float(10,10,10); public test () { setSize(250,150); addMouseListener(this); } public static void main(String[] args) { //TODO code application logic here java.awt.EventQueue.invokeLater(new Runnable() { public void run() { test frame = new test(); frame.setVisible(true); } }); } public void actionPerformed(ActionEvent ae) { } public void drawCircle(int x,int y) { Graphics g = this.getGraphics(); g.drawOval(x,y,x,y); g.setColor(Color.BLACK); g.fillOval(x,2,2); } public void mouseClicked(MouseEvent e) { drawCircle(e.getX(),e.getY()); repaint(); } public void mouseExited(MouseEvent e) { } public void mousePressed(MouseEvent e) { } public void mouseReleased(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } }
解决方法
将鼠标单击(…)更改为:
int x,y; public void mouseClicked(MouseEvent e) { x = e.getX(); y = e.getY(); repaint(); }
覆盖油漆(…):
@Override public void paint(Graphics g) { drawCircle(x,y); }