magnify.java

java Applet程序 5.1 渐隐渐现的文字 5.2 旋转的图形 5.3 钻井工人 5.4 礼炮 5.5 彩带庆贺 5.6 图像放大器 5.7 电子相册 5.8 计算器 5.9

import java.applet.*;
import java.awt.*;
public class Magnify extends Applet 
{
	Image img[];
	int num=0;
	int imgcount=8;
	Choice choice1;
	Label label1;
	int mx=70,my=150;
	int imgheight,imgwidth;
	Checkbox checkbox1,checkbox2;
	boolean boolbox1=false,boolbox2=false,booldown=false;;
	int clipx=300,clipy=300;
	public void init()
	{
		resize(480,400);
		img=new Image[imgcount];
		label1=new Label("选择图像：");
		add(label1);
		choice1=new Choice();
		choice1.addItem("晨曦的小屋");
		choice1.addItem("云中峭壁");
		choice1.addItem("雪山");
		choice1.addItem("长春蔓");	
		add(choice1);
		checkbox1=new Checkbox("反色");
		checkbox2=new Checkbox("裁减区域");
		add(checkbox1);
		add(checkbox2);
		MediaTracker tracker=new MediaTracker(this);
		for(int i=0;i<imgcount;i++)
		{
			img[i]=getImage(getCodeBase(),"map"+String.valueOf(i+1)+".jpg");
		    tracker.addImage(img[i],i);
		    try
		    {    
			   tracker.waitForID(i);
		    }
		    catch(InterruptedException e)
		    {
		    }
		}
	}
	public void paint(Graphics g)
	{
	    int tmp=num;
		int inx,iny;
		if  (boolbox1)
		{
			tmp=tmp+4;
		}
		    imgwidth=img[tmp].getWidth(this);
		    imgheight=img[tmp].getHeight(this);
		    g.drawRect(19,100,101,101);
			g.drawImage(img[tmp],20,101,100,100,this);
		    Graphics gr=g.create();
		    gr.drawRect(124,39,clipx+1,clipy+1);
		    gr.clipRect(125,40,clipx,clipy);
			inx=clipx/2+125;
			iny=clipy/2+40;
			gr.drawImage(img[tmp],inx-(int)(imgwidth/100*(mx-20)),iny-(int)(imgheight/100*(my-101)),this);
		
	}
	public boolean action(Event e,Object o)
	{
		if (e.target.equals(choice1))
		{
			num=choice1.getSelectedIndex();
		}
		if (e.target.equals(checkbox1))
		{
			boolbox1=!boolbox1;
		}
		if (e.target.equals(checkbox2))
		{
			boolbox2=!boolbox2;
		}
		 repaint();
		return true;
	}	
	public boolean mouseMove(Event e,int x,int y)
	{
		
		if ((x>20) && (x<120) &&(y>101) &&(y<201))
		{
		  if (((mx-x)>5)|| ((x-mx)>5) || ((my-y)>5) || ((y-my)>5))
		  {
		     	mx=x;
		        my=y;
		        if (mx<(35+(clipx-300)/10))
			       mx=35+(clipx-300)/10;
		        else if (mx>(106-(clipx-300)/10)) 
			        	mx=106-(clipx-300)/10;
		        if (my<(123+(clipy-300)/7))
			       my=123+(clipy-300)/7;
		        else if (my>(188-(clipy-300)/7) )
			          my=188-(clipy-300)/7;
		        Graphics g=getGraphics();
		        paint(g);
		   }
		}
		return true;
	}
	public boolean mouseDown(Event e,int x,int y)
	{
        if (boolbox2)
		{
			if ((x>clipx+123) && (x<clipx+127) && (y>clipy+38) && (y<clipy+42))
			{
				booldown=true;
			}
		}
		return true;
	}
	public boolean mouseUp(Event e,int x,int y)
	{
		if (booldown)
			booldown=false;
		return true;
	}
	public boolean mouseDrag(Event e,int x,int y)
	{
		if (booldown)
		{
			if ((clipx>x-130)||(clipx>x-120) || (clipy>y-235) || (clipy>y-245))
			{
			      clipx=x-125;
			      clipy=y-40;
			      if (x<225)  
			        clipx=225-125;
			      else if (x>625) 
				     clipx=625-125;
			      if (y<140) 
			         clipy=140-40;
			      else if (y>540)
				     clipy=540-40;
		          repaint();
			}
		}
		return true;
	}
}