在一块画板上实现鼠标点击画图案的功能(本文未实现拖动划线功能)，供大家参考，具体内容如下
与java设计GUI的大体思路一致, 先设置Frame类作为框架, 其中添加组件类作为功能补充. 该设计中需要设置鼠标监听类, 给frame加上组件
this.addMouseListener(new MyMouseListener());
并自己实现一个监听类, implements需要重写所有方法, 所以使用适配器
private class MyMouseListener extends MouseAdapter
给全局一个points数组变量, 保存所有点击的点的信息, 然后重写frame类的paint方法时改成迭代器依次画数组中的点
@Override
public void paint(Graphics g) {
// paint listen on mouse event
Iterator iterator = points.iterator();
while (iterator.hasNext()){
Point point = (Point) iterator.next();
g.setColor(Color.GREEN);
g.fillOval(point.x, point.y, 10, 10);
}
}import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;
public class testmousepaint {
public static void main(String[] args) {
MyFrame myFrame = new MyFrame("IDEA");
}
}
class MyFrame extends Frame{
ArrayList points;
public MyFrame(String title) {
super(title);
setBounds(200, 200, 400, 400);
this.addMouseListener(new MyMouseListener());
setVisible(true);
setBounds(200,200,400,400);
setBackground(Color.white);
points = new ArrayList<>();
}
@Override
public void paint(Graphics g) {
// paint listen on mouse event
Iterator iterator = points.iterator();
while (iterator.hasNext()){
Point point = (Point) iterator.next();
g.setColor(Color.GREEN);
g.fillOval(point.x, point.y, 10, 10);
}
}
public void addpoint(Point point){
points.add(point);
}
private class MyMouseListener extends MouseAdapter{
@Override
public void mousePressed(MouseEvent e) {
MyFrame frame = (MyFrame) e.getSource();
frame.addpoint(new Point(e.getX(), e.getY()));
// click and paint every time
frame.repaint();
}
}
}实现效果
