试图绘制多个多边形导致错误 [英] Trying to draw multiple polygons results in error

问题描述

随着我的previous后<一个href=\"http://stackoverflow.com/questions/15649228/cannot-create-multiple-polygons-in-java-only-one/15649335#15649335\">here ，我改变了code为：

Following my previous post here , I changed the code to :

PolygonnerJframe.java

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.util.ArrayList;
import java.util.Iterator;
import javax.swing.JFrame;
import javax.swing.JPanel;


/**
 * 
 * @author X2
 *
 */
public class PolygonnerJframe
{
    public static void main (String[] args)
    {
     JFrame frame = new JFrame("Draw polygons");
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     frame.setContentPane(new DrawingPanel());
     frame.pack();
     frame.setVisible(true);
 }
}

现在，这个code的结果：

Now , this code results in :

和我不明白是什么原因导致这一点。

And I can't understand what causes this .

这是我所做的改变是：当我们用一个多边形做的，它的坐标每次都保存在类多边形的ArrayList和我创建一个新的多边形，我拿
在previous多边形和吸引他们，同时绘制新的多边形。

The changes that I've made are : when we're done with a polygon , its coordinates are saved in the arrayList of class Polygon , and each time that I create a new polygon , I take the previous polygons and draw them , while drawing a new polygon .

正如你可以在上面看到，出事了用绘画和我似乎无法找到
问题

As you can see above , something went wrong with the drawing and I can't seem to find the problem .

我倒是AP preciate任何帮助。

I'd appreciate any help .

感谢

编辑：

考虑到什么@StanislavL说后，我搬到那些行的mouseClicked（），但这一次，每次我得到一个新的屏幕，创建一个新的多边形没有老的多边形。

After taking into consideration what @StanislavL said , I moved those lines to mouseClicked() , but this time I get a new screen each time that a new polygon is created without the "old" polygons .

只是一个新的多边形......不旧的

Just a new polygon ... without the old ones

推荐答案

@Stas code对我的作品不用其他任何add_ons（加入基本的东西在IDE哭了），你有没有这意味着最后的结果可能是???

@Stas code works for me witout any add_ons (added basic stuff cried in IDE), did you meaning final result could be ???

修改

肮脏的黑客是禁止super.paintComponent方法（G）;,但适当的方式应该是唯一的。

dirty hack is disable super.paintComponent(g);, but proper way should be only

• 所有对象添加到阵列中（见@ trashgod很清楚评论）

• to add all Objects to the array (see quite clear comment by @ trashgod)

创建BurreferImage作为Backgroung图像（后鼠标DOUBLE_CLICK）

create an BurreferImage as Backgroung Image (after Mouse Double_Click)

通过禁用super.paintComponent方法（G）输出;

output by disable super.paintComponent(g);

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