JavaGUI之画笔
package com.JavaGUI.Demo03;
import java.awt.*;
public class TestPaint {
public static void main(String[] args) {
new MyPaint().loadFrame();
}
}
class MyPaint extends Frame{
public void loadFrame(){
setBounds(200, 200, 500, 500);
setVisible(true);
}
@Override
public void paint(Graphics g) {
//super.paint(g);
//画笔,需要有颜色,才可以看到
g.setColor(Color.RED);
//画一个圆,x,y为起点
g.drawOval(100, 100, 100, 100);
g.setColor(Color.BLUE);
g.drawRect(300, 300, 100, 100);
g.setColor(Color.GREEN);
//填充
g.fillOval(400, 200, 100, 100);
}
//使用完尽量换还原画笔最初的颜色,为黑色
}
package com.JavaGUI.Demo03;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.ArrayList;
import java.util.Iterator;
public class TestMouseListener {
public static void main(String[] args) {
new MyFrame("MouseListener");
}
}
class MyFrame extends Frame{
//画画需要画笔,需要监听鼠标当前的位置,需要集合来存储这个点
ArrayList points;
public MyFrame(String title){
super(title);
setBounds(200, 200, 400, 400);
setVisible(true);
//存储鼠标点击的点
points = new ArrayList<>();
//鼠标监听器,正对着这个窗口
this.addMouseListener(new MyMouseListener());
}
@Override
public void paint(Graphics g) {
//画画,监听鼠标的事件
Iterator iterator = points.iterator();
while(iterator.hasNext()){
Point point = (Point) iterator.next();
g.setColor(Color.BLUE);
g.fillOval(point.x, point.y, 10, 10);
}
}
//添加一个点到界面上
public void addPaint(Point point){
points.add(point);
}
//适配器模式
private class MyMouseListener extends MouseAdapter{
//鼠标 按下,弹起,按住不放
@Override
public void mousePressed(MouseEvent e) {
MyFrame frame = (MyFrame) e.getSource();
//这个我们点击的时候,就会在界面上产生一个点!
//这个点就是鼠标的点
frame.addPaint(new Point(e.getX(), e.getY()));
//每次点击鼠标都要重新画一遍
frame.repaint();//刷新
}
}
}