Java开发网 - 为什么会出现这样的情况？

Topic: 为什么会出现这样的情况？

1.为什么会出现这样的情况？

Posted by: afen311
Posted on: 2005-03-11 14:19

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;

public class Map extends JFrame{
  public Map(){
    super("Map");
    setSize(350,350);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    MapPane map=new MapPane();
    Container content=getContentPane();
    content.add(map);
    setVisible(true);
  }
}

class MapPane extends JPanel{

public void paintComponent(Graphics comp){
  Graphics2D comp2D=(Graphics2D)comp;
  comp2D.setColor(Color.blue);
  Rectangle2D.Float background=new Rectangle2D.Float(0F,0F,(float)getSize().width,(float)getSize().height);
  comp2D.fill(background);
  //Draw waves
  comp2D.setColor(Color.white);
  BasicStroke pen=new BasicStroke(2F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);
  comp2D.setStroke(pen);
  for(int ax=0;ax<340;ax+=10)
   for(int ay=0;ay<340;ay+=10){
     Arc2D.Float wave=new Arc2D.Float(ax,ay,10,10,0,-180,Arc2D.OPEN);
     comp2D.draw(wave);
   }
   //Draw Florida
   GradientPaint gp=new GradientPaint(0F,0F,Color.green,350F,350F,Color.orange,true);
   comp2D.setPaint(gp);
   GeneralPath f1=new GeneralPath();
   f1.moveTo(10F,12F);
   f1.lineTo(234F,12F);
   f1.lineTo(253F,25F);
   f1.lineTo(261F,71F);
   f1.lineTo(344F,209F);
   f1.lineTo(336F,278F);
   f1.lineTo(295F,310F);
   f1.lineTo(259F,274F);
   f1.lineTo(205F,188F);
   f1.lineTo(211F,171F);
   f1.lineTo(195F,174F);
   f1.lineTo(191F,118F);
   f1.lineTo(120F,50F);
   f1.lineTo(94F,68F);
   f1.lineTo(81F,49F);
   f1.lineTo(12F,37F);
   f1.closePath();
   comp2D.fill(f1);
   //Daw ovals
   comp2D.setColor(Color.black);
   BasicStroke pen2=new BasicStroke();
   comp2D.setStroke(pen2);
   Ellipse2D.Float e1=new Ellipse2D.Float(23,40,15,15);
   Ellipse2D.Float e2=new Ellipse2D.Float(225,130,15,15);
   Ellipse2D.Float e3=new Ellipse2D.Float(245,130,15,15);
   comp2D.fill(e1);
   comp2D.fill(e2);
   comp2D.fill(e3);


}
}
以上代码运行正常，为什么不能出现预计的画图效果呢？请大家赐教，先行谢过了！

2.Re:为什么会出现这样的情况？ [Re: afen311]	Copy to clipboard
Posted by: cnfree Posted on: 2005-03-11 15:53 你预计的画图效果是什么？？？

3.Re:为什么会出现这样的情况？ [Re: afen311]	Copy to clipboard
Posted by: 九佰 Posted on: 2005-03-11 17:18 （缩略图，点击图片链接看原图）

4.Re:为什么会出现这样的情况？ [Re: 九佰]	Copy to clipboard
Posted by: afen311 Posted on: 2005-03-12 21:19 我要的就是这个效果，为什么我不能实现呢？是那出问题了呢？我是初学者，好多都不太懂，呵呵！

5.Re:为什么会出现这样的情况？ [Re: 九佰]	Copy to clipboard
Posted by: afen311 Posted on: 2005-03-12 21:35 请问你是怎么实现这个程序的？

6.Re:为什么会出现这样的情况？ [Re: afen311]	Copy to clipboard
Posted by: afen311 Posted on: 2005-03-12 21:48 对了我编译通过了运行时提示：Exception in thread "main" java.lang.NoSucMethodError:main

7.Re:为什么会出现这样的情况？ [Re: afen311]

Copy to clipboard

Posted by: 九佰
Posted on: 2005-03-13 10:10

全部代码如下：

package my.test;

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;

public class Map extends JFrame{
public Map(){
super("Map");
setSize(350,350);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
MapPane map=new MapPane();
Container content=getContentPane();
content.add(map);
setVisible(true);
}

public static void main(String args[]){
my.test.Map map = new my.test.Map();
}
}

class MapPane extends JPanel{

public void paintComponent(Graphics comp){
Graphics2D comp2D=(Graphics2D)comp;
comp2D.setColor(Color.blue);
Rectangle2D.Float background=new Rectangle2D.Float(0F,0F,(float)getSize().width,(float)getSize().height);
comp2D.fill(background);
//Draw waves
comp2D.setColor(Color.white);
BasicStroke pen=new BasicStroke(2F,BasicStroke.CAP_BUTT,BasicStroke.JOIN_ROUND);
comp2D.setStroke(pen);
for(int ax=0;ax<340;ax+=10)
for(int ay=0;ay<340;ay+=10){
Arc2D.Float wave=new Arc2D.Float(ax,ay,10,10,0,-180,Arc2D.OPEN);
comp2D.draw(wave);
}
//Draw Florida
GradientPaint gp=new GradientPaint(0F,0F,Color.green,350F,350F,Color.orange,true);
comp2D.setPaint(gp);
GeneralPath f1=new GeneralPath();
f1.moveTo(10F,12F);
f1.lineTo(234F,12F);
f1.lineTo(253F,25F);
f1.lineTo(261F,71F);
f1.lineTo(344F,209F);
f1.lineTo(336F,278F);
f1.lineTo(295F,310F);
f1.lineTo(259F,274F);
f1.lineTo(205F,188F);
f1.lineTo(211F,171F);
f1.lineTo(195F,174F);
f1.lineTo(191F,118F);
f1.lineTo(120F,50F);
f1.lineTo(94F,68F);
f1.lineTo(81F,49F);
f1.lineTo(12F,37F);
f1.closePath();
comp2D.fill(f1);
//Daw ovals
comp2D.setColor(Color.black);
BasicStroke pen2=new BasicStroke();
comp2D.setStroke(pen2);
Ellipse2D.Float e1=new Ellipse2D.Float(23,40,15,15);
Ellipse2D.Float e2=new Ellipse2D.Float(225,130,15,15);
Ellipse2D.Float e3=new Ellipse2D.Float(245,130,15,15);
comp2D.fill(e1);
comp2D.fill(e2);
comp2D.fill(e3);

}
}

8.Re:为什么会出现这样的情况？ [Re: 九佰]	Copy to clipboard
Posted by: afen311 Posted on: 2005-03-13 10:50 啊谢谢谢谢！^_^ I see I see.