showcanvas.java

学习日语的一个小程序！ 可以用来它帮助记忆日语的假名！

import javax.microedition.lcdui.*;
import java.io.*;
import java.util.*;

public class showCanvas extends Canvas //implements Random
{
		Image[] iPing;
		Image ii;
		Vector v ;
		int radNum=1;
		Object oRad=1+"";
		boolean bSee = false;
		boolean bStar = false;
		String[] sPing={"/a.png","/i.png","/u.png","/e.png","/o.png",
				"/ka.png","/ki.png","/ku.png","/ke.png","/ko.png",	
				"/sa.png","/si.png","/su.png","/se.png","/so.png",
				"/ta.png","/ci.png","/cu.png","/te.png","/to.png",
				"/na.png","/ni.png","/nu.png","/ne.png","/no.png",
				"/ha.png","/hi.png","/hu.png","/he.png","/ho.png",
				"/ma.png","/mi.png","/mu.png","/me.png","/mo.png",
				"/ya.png",	    "/yu.png",         "/yo.png",
				"/ra.png","/ri.png","/ru.png","/re.png","/ro.png",
				"/wa.png",                              "/ou.png",
				"/n.png"
				};
	public showCanvas()
	{
		Object o = new Object();
		
		v= new Vector();
		for (int i=1;i<42;i++)
		{
			v.addElement(i+"");//""+i=object？？
			
		}
		
		initImg();
		
	}
	
	public void paint(Graphics g)
	{
		
		g.setColor(255,255,255);
		g.fillRect(0,0,getWidth(),getHeight());
	//	System.out.println("Draw it");
		

		if (bStar)
		g.drawImage(scaleImg(iPing[radNum-1],getWidth(),getHeight()),0,0,Graphics.TOP|Graphics.LEFT);
		
		if (bSee)
		{
		g.setColor(255,0,0);
		g.setFont(Font.getFont(Font.FACE_SYSTEM,Font.STYLE_BOLD,Font.SIZE_LARGE));
		g.drawString(getAnswer(radNum-1),4*getWidth()/5,getHeight()/20,Graphics.TOP|Graphics.LEFT);
		bSee = false;
		}
	
	}
	
	public void keyPressed(int keyCode)
	{
		int keys = getGameAction(keyCode);
		
		bSee = true;
		repaint();
	/*	if (keys == DOWN)
		{
			
		}*/
		
		
	}
	
		
	/*放大缩小图片的函数*/
	public Image scaleImg(Image src,int dstW,int dstH)
	{
		int srcW = src.getWidth();
		int srcH = src.getHeight();
		
		Image buf1 = Image.createImage(dstW,srcH);
		Graphics bg = buf1.getGraphics();
		
		int srcX=0;
		for(int x = 0;x<dstW;x++)//先横向扩展
		{
			srcX = x*srcW/dstW;//求扩展后的某点X所对应的原图上的X
			bg.setClip(x,0,1,srcH);
			bg.drawImage(src,x-srcX,0,0);								
		}
	
		Image buf2 = Image.createImage(dstW,dstH);
		bg = buf2.getGraphics();
		
		int srcY = 0;
		for(int y=0;y<dstH;y++)
		{
			srcY = y*srcH/dstH;
			bg.setClip(0,y,dstW,1);
			bg.drawImage(buf1,0,y-srcY,0);
		}
		return buf2;
		
	}
	
	//获得假名的名称
	public String getAnswer(int k)
	{
		String sA;
		int ed= sPing[k].indexOf(".");
		
		
		sA = sPing[k].substring(1,ed);
	
	
	
		return sA;
		
			
	}


	
	public void initImg()
	{
	
	
		iPing = new Image[sPing.length];//此句必须有。
		
		for (int i=0;i<sPing.length;++i)
		{
		try
		{
			iPing[i] = Image.createImage(sPing[i]);
			
		}
		catch(Exception e){}
		//System.out.println(sPing[i]);
		}
		
		
		
	/*	try
		{
		g.drawImage(Image.createImage("/op.png"),0,0,Graphics.TOP|Graphics.LEFT);
	}catch(Exception e){}*/
	}
	
	public int randomPic()
	{
	
		
		 int irad;
		/*获得随机数的方法*/
		Random r = new Random();
		
		if (v.size()>=1)
		{
		radNum = Math.abs(r.nextInt())%(v.size());
		System.out.println("radNum is :"+radNum);
		oRad = v.elementAt(radNum);
		v.removeElement(oRad);
		//System.out.println(v.size());
		//v.trimToSize();
		}

		radNum = Integer.parseInt(oRad.toString());
		return radNum;
	}
}