java基于GUI实现简单画笔小画板 java基于GUI实现简单画笔小画板

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
思路 【java基于GUI实现简单画笔小画板】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

@Overridepublic void paint(Graphics g) {// paint listen on mouse eventIterator iterator = points.iterator(); while (iterator.hasNext()){Point point = (Point) iterator.next(); g.setColor(Color.GREEN); g.fillOval(point.x, point.y, 10, 10); }}

完整代码

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<>(); }@Overridepublic void paint(Graphics g) {// paint listen on mouse eventIterator 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{@Overridepublic void mousePressed(MouseEvent e) {MyFrame frame = (MyFrame) e.getSource(); frame.addpoint(new Point(e.getX(), e.getY())); // click and paint every timeframe.repaint(); }}}

实现效果