helpcanvas.java

俄罗斯方块游戏J2ME手机游戏源代码_俄罗斯方块

package hujkay.help;

import hujkay.* ;

import javax.microedition.lcdui.*;

import java.io.*;


public class HelpCanvas extends Canvas implements CommandListener {

	private Image imagecontent ;
	private int picturex ,picturey ;
	private int wide , height ;
	private boolean loadsuccess = true ;
	private Block block ;
	private Command okcommand = new Command("OK",Command.OK,1) ;
	
	public HelpCanvas()
	{
		wide = this.getWidth() ;
		height = this.getHeight() ;
		try
		{
			imagecontent = Image.createImage("/block/help/content.png");
		}
		catch(Exception e)
		{
			e.printStackTrace() ;
			loadsuccess = false ;
			return ;
		}
		
		if(wide > imagecontent.getWidth())
		{
			picturex = ( wide - imagecontent.getWidth()) / 2 ;
			picturey = ( height - imagecontent.getHeight()) / 2 ;
		}
		else
		{
			picturex = picturey = 0 ;
		}
		this.addCommand(okcommand) ;
		this.setCommandListener(this) ;
	}

	public HelpCanvas(Block block)
	{
		this.block = block ;
		this.addCommand(okcommand) ;
		this.setCommandListener(this) ;
		wide = this.getWidth() ;
		height = this.getHeight() ;
		try
		{
			imagecontent = Image.createImage("/block/help/content.png");
		}
		catch(Exception e)
		{
			e.printStackTrace() ;
			loadsuccess = false ;
			return ;
		}
		
		if(wide > imagecontent.getWidth())
		{
			picturex = ( wide - imagecontent.getWidth()) / 2 ;
			picturey = ( height - imagecontent.getHeight()) / 2 ;
		}
		else
		{
			picturex = picturey = 0 ;
		}
	}
	
	protected void paint(Graphics g) {
		// TODO Auto-generated method stub
		if( loadsuccess)
		{
			g.setColor(0,240,240);
			g.fillRect(0,0,wide,height);
			g.drawImage(imagecontent,picturex,picturey,Graphics.LEFT|Graphics.TOP);
		}
		else
		{
			g.drawString("Load failed",wide/2-10,height/2-5,Graphics.LEFT|Graphics.TOP);
		}
	}

	public void commandAction(Command c, Displayable d)
	{
		if(c.getLabel().equals("OK"))
			block.mangeaction(0,3); 
	}
}