gamecanvas.java

《神州》RPG游戏引擎

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;

public abstract class GameCanvas extends Canvas

{
	public static final int UP_PRESSED = 0x0002;

	public static final int DOWN_PRESSED = 0x0040;

	public static final int LEFT_PRESSED = 0x0004;

	public static final int RIGHT_PRESSED = 0x0020;

	public static final int FIRE_PRESSED = 0x0100;

	public static final int GAME_A_PRESSED = 0x0200;

	public static final int GAME_B_PRESSED = 0x0400;

	public static final int GAME_C_PRESSED = 0x0800;

	public static final int GAME_D_PRESSED = 0x1000;

	protected int keyStates;
	protected int releasedKeys;
	private Image bufferedImage;
	private int clipX, clipY, clipWidth, clipHeight;
	private boolean setClip;

	protected GameCanvas( boolean suppressKeyEvents ) {		
			super();
            this.setFullScreenMode(true);
	
			int width = getWidth();
			int height = getHeight();
            if(width>=176)
            {
                if(height<208)
                {
                    height=208;
                }
            }	
		this.bufferedImage = Image.createImage( width, height );
		
	}

	protected Graphics getGraphics()
	{
		return this.bufferedImage.getGraphics();
	}

	public int getKeyStates()
	{
		int states = this.keyStates;
	    this.keyStates &= ~this.releasedKeys;
	    this.releasedKeys = 0;
	    return states;
	}

	public void paint( Graphics g)
	{
		if (this.setClip) {
			g.clipRect( this.clipX, this.clipY, this.clipWidth, this.clipHeight);
			this.setClip = false;
		}
		g.drawImage(this.bufferedImage, 0, 0, Graphics.TOP | Graphics.LEFT );
	}

	public void flushGraphics(int x, int y, int width, int height)
	{
		this.setClip = true;
		this.clipX = x;
		this.clipY = y;
		this.clipWidth = width;
		this.clipHeight = height;
		repaint();
		serviceRepaints();
	}

	public void flushGraphics()
	{
		repaint();
		serviceRepaints();
	}

	protected void keyPressed(int keyCode) {
		int gameAction = KeyMapping.getGameKey(keyCode);
		if (gameAction != 0) {
			int bit = 1 << gameAction;
			this.keyStates |= bit;
	        this.releasedKeys &= ~bit;
		}
	}
	

	public void setFullScreenMode(boolean enable) {		
        super.setFullScreenMode(enable);			
	}

	protected void keyReleased(int keyCode) {
		int gameAction = KeyMapping.getGameKey(keyCode);
		if (gameAction != 0) {
			this.releasedKeys |= 1 << gameAction;
		}
	}


}