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因此,我已经做了几个月的Java,现在我正在学习Graphics。所以,我正在尝试制作一种绘画类的东西,在那里我可以用鼠标画画。没有什么真正的想法,只是让我开始的东西。只要我拖动鼠标,该程序就会绘制一个小点。它有些作品,除了它没有保存我的旧点之外。它只是创建一个新的!那将是怎样,如果有人可以帮我解决这个问题:Java:程序不保存旧图形
主要类:
import javax.swing.JFrame;
public class Test{
public static void main(String args[]){
Ploofer ploof = new Ploofer();
PumpkinPie f = new PumpkinPie(ploof);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setSize(1000,1000);
f.setResizable(false);
ploof.setSize(1000,1000);
f.add(ploof);
f.setVisible(true);
}
}
“Ploofer” 类:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JPanel;
public class Ploofer extends JPanel{
PumpkinPie pObj = new PumpkinPie(this);
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
this.setBackground(Color.WHITE);
g2d.setColor(new Color(190, 50, 0));
if(pObj.draw==true){
g2d.fillRect(pObj.x, pObj.y, 2, 2);
pObj.draw = false;
}
}
@Override
public void update(Graphics g){
paint(g);
}
//I tried to override update, but it didn't really help
}
“南瓜派” 类:
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.JPanel;
public class Ploofer extends JPanel{
PumpkinPie pObj = new PumpkinPie(this);
@Override
public void paintComponent(Graphics g){
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
this.setBackground(Color.WHITE);
g2d.setColor(new Color(190, 50, 0));
/* g2d.fillRect(475, 475, 50, 50);
g2d.drawString("^Red^", 484, 540); */
if(pObj.draw==true){
g2d.fillRect(pObj.x, pObj.y, 2, 2);
pObj.draw = false;
}
}
@Override
public void update(Graphics g){
paint(g);
}
//I tried to override update, but it didn't really help
}
非常感谢!我想我以前有过这样的事情,但显然我做错了一些事情!但是,它现在终于起作用了!再一次,谢谢你! – Zyphicx