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画笔：Piant
学习Piant的时候我记得当时学习Python的海龟作图的时候就写过奥运五环，没想到在Java也能实现。
想看python的奥运五环参照：奥运五环
package 狂神说__Paint;
import java.awt.*;
public class TestPaint {
public static void main(String[] args) {
new MyPaint().loadFrame();
}
}
class MyPaint extends Frame{
public void loadFrame(){
setBounds(200,200,600,400);
setVisible(true);
}
public void paint(Graphics g){
super.paint(g);
g.setColor(Color.blue);
//g.drawOval(100,100,100,100);
g.drawOval(100,100,100,100);
g.setColor(Color.black);
g.drawOval(200,100,100,100);
g.setColor(Color.red);
g.drawOval(300,100,100,100);
g.setColor(Color.yellow);
g.drawOval(150,150,100,100);
g.setColor(Color.green);
g.drawOval(250,150,100,100);
}
}
画图：在空白板中点点
package 狂神说__Paint;
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("画图");
}
}
class MyFrame extends Frame{
//画笔，需要集合存储点
ArrayList points;//动态数组存储点
public MyFrame(String title){
super(title);
setBounds(200,200,400,300);
//存储鼠标的点
points=new ArrayList<>();
//鼠标监听器
this.addMouseListener(new MyMouseListener());
setVisible(true);
}
public void paint(Graphics g){
//监听鼠标事件
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{
//鼠标点击
public void mousePressed(MouseEvent e){
MyFrame myFrame=(MyFrame)e.getSource();
//点击鼠标时会出现一个点
myFrame.addPaint(new Point(e.getX(),e.getY()));
//每次点击鼠标都需要重新画一次
myFrame.repaint();//刷新
}
}
}
键盘的监听事件：按下上下左右给出动作
package 狂神说__Paint;
import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class TestKeyListener {
public static void main(String[] args) {
new KeyFrame();
}
}
class KeyFrame extends Frame{
public KeyFrame() {
setBounds(1,2,300,400);
setVisible(true);
this.addKeyListener(new KeyAdapter() {
//键盘按下出现的事件
@Override
public void keyPressed(KeyEvent e) {
//键盘按键
int keyCode=e.getKeyCode();
if(keyCode==KeyEvent.VK_UP){
System.out.println("按下了上键");
}
else if(keyCode==KeyEvent.VK_DOWN){
System.out.println("按下了下键");
}
else if(keyCode==KeyEvent.VK_LEFT){
System.out.println("按下了左键");
}
else if(keyCode==KeyEvent.VK_RIGHT){
System.out.println("按下了右键");
}
else{
System.out.println("按下了其他键");
}
}
});
}
}
