fire.java

随着手机的日益普及、Java功能在移动设备上的实现

/*
 * Fire.java
 *
 * Copyright 2000 JJKING Software, Junichi Ito <[e-mail]>
 * Permission to use, copy, modify, and distribute this software and its
 * documentation without fee for NON-COMMERCIAL is free.
 */
 
import com.sun.kjava.Bitmap;
import com.sun.kjava.Graphics;

/**
 * This class represents a animation character "Fire". 
 */
public class Fire extends AnimChar
{
	/**
	 * The bitmap patterns.
	 */
	static final short[][] pattern = {
		{	// fire 1
			  (short)0x0010, (short)0x000c, (short)0x0002, (short)0x0000
			, (short)0x0101, (short)0x0000, (short)0x0000, (short)0x0000
			, (short)0x0340, (short)0x4ca4, (short)0x9212, (short)0xa9c8
			, (short)0x2210, (short)0x2028, (short)0x180a, (short)0xa24a
			, (short)0x9190, (short)0x5a24, (short)0x05c0, (short)0x0000
		}
		,{	// fire 2
			  (short)0x0010, (short)0x000c, (short)0x0002, (short)0x0000
			, (short)0x0101, (short)0x0000, (short)0x0000, (short)0x0000
			, (short)0x0000, (short)0x0000, (short)0x06c0, (short)0x0920
			, (short)0x2840, (short)0x2a28, (short)0x04a8, (short)0x0920
			, (short)0x06c0, (short)0x0000, (short)0x0000, (short)0x0000
		}
	};

	/**
	 * Fire bitmaps.
	 */
	static Bitmap[] fireBitmap = {
		  new Bitmap(pattern[0])
		, new Bitmap(pattern[1])
	};

	/**
	 * The bitmap information.
	 */
	static final int BITMAP_WIDTH = 16;
	static final int BITMAP_HEIGHT = 12;

	/**
	 * The active state of Fire.
	 */
	static final int STATE_MOVE = 1;

	/**
	 * The old x coordinate of top-left corner of a character.
	 */
	int ox;

	/**
	 * The old y coordinate of top-left corner of a character.
	 */
	int oy;

	/**
	 * The x step to move fire.
	 */
	int vx;

	/**
	 * The y step to move fire.
	 */
	int vy;

	/**
	 * The X step to move fire.
	 */
	public static final int VX = 4;

	/**
	 * The Y step to move fire.
	 */
	public static final int VY = 4;

	/**
	 * Create new fire with the specified information.
	 */
	public Fire(int x, int y, int vx, int vy)
	{
		this.x = x;
		this.y = y;
		this.vx = vx;
		this.vy = vy;
		ox = x;
		oy = y;
	}

	/**
	 * This method is invoked when manager starts to manage this character.
	 * @param mgr the animation manager.
	 */
	public void start(AnimManager mgr)
	{
		super.start(mgr);
		setState(STATE_MOVE);
		appear = true;
	}

	/**
	 * Sets the state.
	 * @param the state of character.
	 */
	public void setState(int state)
	{
		this.state = state;
		switch(state)
		{
		case STATE_MOVE:
			duration = 4;
			break;
		}
	}

	/**
	 * Move the character.
	 */
	public void move()
	{
		ox = x;
		oy = y;
		if (state == STATE_MOVE) {
			Rectangle bounds = mgr.getFieldBounds();
			if (x <= bounds.x || x >= bounds.x + bounds.width - BITMAP_WIDTH) {
				setState(STATE_HIDE);
			}
			else {
				x += vx;
				y += vy;
			}
		}
		
		// decrease counter
		duration --;
		if (duration > 0) { return; }
		
		// change state
		setState(STATE_HIDE);
	}
	
	/**
	 * Draw the character on the given graphics.
	 * @param g the graphics.
	 */
	public void paint(Graphics g)
	{
		// clear bitmap
		if (state == STATE_HIDE && appear) {
			g.drawRectangle(ox, oy, BITMAP_WIDTH, BITMAP_HEIGHT
				, Graphics.ERASE, 0);
			appear = false;
			return;
		}
		if (ox != x || oy != y) {
			g.drawRectangle(ox, oy, BITMAP_WIDTH, BITMAP_HEIGHT
				, Graphics.ERASE, 0);
		}
		
		// draw bitmap
		g.drawBitmap(x, y, fireBitmap[duration > 1 ? 0 : 1]);
	}
}