按下按钮后如何使其重新绘制?当我启动小程序时,它会在随机位置绘制 2 个具有随机宽度和高度的矩形,如何让它们在按下按钮后在不同位置“重生”?
package test;
import java.applet.Applet;
import java.awt.Button;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Random;
public class Main extends Applet implements ActionListener{
private static final long serialVersionUID = 1L;
Thread thread = new Thread();
boolean running = true;
Random r = new Random();
public int randX = r.nextInt(400);
public int randY = r.nextInt(400);
public int randW = r.nextInt(100);
public int randH = r.nextInt(100);
public int randX2 = r.nextInt(400);
public int randY2= r.nextInt(400);
public int randW2 = r.nextInt(100);
public int randH2 = r.nextInt(100);
public void start(){thread.start();}
public void stop(){}
public void init(){
setSize(500,500);
Button randomButton = new Button("RANDOMNESS");
randomButton.addActionListener(this);
add(randomButton);
}
public void run(){}
public void destroy(){}
public void paint(Graphics g){ //paints rect with random with and height
g.fillRect(randX, randY, randW, randH);
g.fillRect(randX2, randY2, randW2, randH2);
}
@Override
public void actionPerformed(ActionEvent e) {// How can they repaint at a different random location after pressing the button?
System.out.println("WORKING");
}
}
最佳答案
您可以在您的 actionPerformed(...)
方法中简单地更改 randX、randY 等,方法是为它们提供新的随机值,就像您当前所做的那样,然后调用repaint()
来通知小程序重新绘制自身?
顺便说一句,这段代码应该做什么?
Thread thread = new Thread();
// .....
public void start(){thread.start();}
根据我的观点,它没有多大作用。
关于java - 按下按钮后尝试绘画,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24705833/