package com.lan;
import java.io.IOException;
import java.io.InputStream;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
public class MyCanvas extends Canvas{
private int screenW=0;
private int screenH = 0;
private int imgBkW = 0;
private int imgBkH = 0;
private Image image;
//背景图片
private static Image imgBk = null;
private int imgBkCol = 0;
private int imgBkRow = 0;
public MyCanvas()
{
//把当前界面设定为全屏模式
this.setFullScreenMode( true );
//获取完整屏幕宽度和高度
screenW = getWidth();
screenH = getHeight();
this.setBackground("/bg.png");
}
protected void paint( Graphics g )
{
g.setColor( 0xffffff );
g.fillRect( 0, 0, screenW, screenH );
g.drawImage( imgBk, 0, 0, Graphics.LEFT | Graphics.TOP );//画背景图片
}
public void setBackground(String bgurl)
{
try
{
InputStream inBk = this.getClass().getResourceAsStream( bgurl );
//创建背景图片对象
imgBk = Image.createImage( inBk );
//背景图片宽度和高度
imgBkW = imgBk.getWidth();
imgBkH = imgBk.getHeight();
//背景图片列数和行数
imgBkCol = screenW / imgBkW + 1;
imgBkRow = screenH / imgBkH + 1;
//两个参数是全屏后屏幕的宽度和高度
Image img = Image.createImage( screenW, screenH );
Graphics g = img.getGraphics(); //取屏幕对象?
for( int i = 0; i < imgBkCol; i ++ )
{
for( int j = 0; j < imgBkRow; j ++ )
{
g.drawImage( imgBk, i * imgBkW, j * imgBkH, Graphics.TOP | Graphics.LEFT );
}
}
imgBk = null;
imgBk = img;
} catch( IOException ex )
{
ex.printStackTrace();
}
}
}
