barrier.java

a modefied space invader game

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/**
 * <p>Title: DemoVader</p>
 * <p>Description: .</p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: Symbian Ltd</p>
 * @author Alan Newman - [e-mail]
 * @version 1.0
 */

import javax.microedition.lcdui.*;
import javax.microedition.lcdui.game.Sprite;

public class Barrier extends Sprite{

	protected static int cols=2;
	
	int[][] imageMap;
	Image[] imageFrames;
	Image sourceImage;
	final int TILES=1;
	Image image;
	int imageWidth;	
	int imageHeight;
	static int tileWidth;
	static int tileHeight;
	int canvasWidth;	
	int canvasHeight;
	protected static final int RAW_FRAMES=1;
	protected static final String IMAGE_NAME="barrier";
	protected int xPos;
	protected int yPos;  
	
	protected static VaderCanvas gameCanvas;
  	protected static VaderManager layerManager;

	public Barrier(Image image, int width, int height)
	{		
	    super (image,width,height);
	    sourceImage=image;
	    tileWidth=width;
	    tileHeight=height;
	    gameCanvas=layerManager.getGameCanvas();   
	    Image sprite=createImage();	    
	    this.setImage(sprite, sprite.getWidth(), sprite.getHeight());
	}
  
	public static int getCols()				{return cols;}	
	public static int getTileHeight()		{return tileHeight;}
	public static int getTileWidth()		{return tileWidth;}
	public int getCanvasHeight()			{return canvasHeight;}
	public int getCanvasWidth()				{return canvasWidth;}
	public Image getImage()					{return image;}
	public static void setLayerManager(VaderManager manager)		{layerManager=manager;}
  
  	private void setCell(int col, int row, int value)
	{
		imageMap[col][row]=value;
	}

	public Image createImage()
	{				
		int columns=(int)(gameCanvas.getWidth()/4/tileWidth)+1;
		int rows=20;		

		int imageWidth=columns*getTileWidth();
		int imageHeight=rows*getTileHeight();	
		
		Image image=Image.createImage(imageWidth, imageHeight);		

		imageMap = new int[columns][rows];
		
		int tiles=columns*rows;
		for (int i = 0; i < tiles; i++)    
		{
		  int c = i % columns;
		  int r = (i - c) / columns;
		  setCell(c, r, 0);
		}
	
		return setTileImages(image, columns, rows);
	}

	private Image setTileImages(Image image, int columns, int rows)
	{	
		Graphics g = image.getGraphics();
		int tiles=columns*rows;	
		Image tempImage;
		
		int frameCols=(sourceImage.getWidth()/getTileWidth());
		int frameRows=(sourceImage.getHeight()/getTileHeight());
		int frames=frameCols*frameRows;
		
		Image[] imageFrames=new Image[frames];
		
		for(int f=0;f<frames;f++)
		{
			int col = f % frameCols;
		  	int row = (f - col) / frameCols;
			imageFrames[f]=Image.createImage(sourceImage,row, col, getTileWidth(), getTileHeight(), Sprite.TRANS_NONE);
		}
	
		for (int i = 0; i < tiles; i++)    
		{
		  int c = i % columns;
		  int r = (i - c) / columns;
		  
		  g.drawImage(imageFrames[imageMap[c][r]],c*getTileHeight(),r*getTileWidth(),g.LEFT | g.TOP);
		}	
	
		return image;
	}
}