fish.java

随着手机的日益普及、Java功能在移动设备上的实现

/*
 * Fish.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 "Fish". 
 */
public class Fish extends AnimChar
{
	/**
	 * The bitmap patterns.
	 */
	static final short[][] pattern = {
		{	// fish 1
			  (short)0x0010, (short)0x000c, (short)0x0002, (short)0x0000
			, (short)0x0101, (short)0x0000, (short)0x0000, (short)0x0000
			, (short)0x0000, (short)0x01c0, (short)0x3e20, (short)0x43d3
			, (short)0xb43c, (short)0xa403, (short)0x8404, (short)0x4b07
			, (short)0x3288, (short)0x1934, (short)0x07d4, (short)0x0008
		}
		,{	// fish 2
			  (short)0x0010, (short)0x000c, (short)0x0002, (short)0x0000
			, (short)0x0101, (short)0x0000, (short)0x0000, (short)0x0000
			, (short)0x03c0, (short)0x0420, (short)0x0fd0, (short)0x1030
			, (short)0x3008, (short)0x4807, (short)0xa584, (short)0xb683
			, (short)0x853c, (short)0x4fd7, (short)0x3018, (short)0x0000
		}
		,{	// fish disappear 1
			  (short)0x0010, (short)0x000c, (short)0x0002, (short)0x0000
			, (short)0x0101, (short)0x0000, (short)0x0000, (short)0x0000
			, (short)0x0100, (short)0x0820, (short)0x1110, (short)0x0540
			, (short)0x0000, (short)0x2d68, (short)0x0000, (short)0x0540
			, (short)0x1110, (short)0x0820, (short)0x0100, (short)0x0000
		}
		,{	// fish disappear 2
			  (short)0x0010, (short)0x000c, (short)0x0002, (short)0x0000
			, (short)0x0101, (short)0x0000, (short)0x0000, (short)0x0000
			, (short)0x0000, (short)0x0000, (short)0x0540, (short)0x0820
			, (short)0x0100, (short)0x0aa0, (short)0x0100, (short)0x0820
			, (short)0x0540, (short)0x0000, (short)0x0000, (short)0x0000
		}
	};

	/**
	 * Fish bitmaps.
	 */
	static Bitmap[] fishBitmap = {
		  new Bitmap(pattern[0])
		, new Bitmap(pattern[1])
		, new Bitmap(pattern[2])
		, new Bitmap(pattern[3])
	};

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

	/**
	 * The active state of Fish.
	 */
	static final int STATE_MOVE = 1;
	static final int STATE_GOAWAY = 2;

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

	/**
	 * The y step to move fish.
	 */
	static final int VY = 2;

	/**
	 * This method is invoked when manager starts to manage this character.
	 * @param mgr the animation manager.
	 */
	public void start(AnimManager mgr)
	{
		super.start(mgr);
		Rectangle bounds = mgr.getFieldBounds();
		x = bounds.x + AnimManager.random((bounds.width - BITMAP_WIDTH) / 2) * 2;
		y = bounds.y;
		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_GOAWAY:
			duration = 4;
			break;

		case STATE_MOVE:
			duration = 100;
			break;
		}
	}

	/**
	 * Move the character.
	 */
	public void move()
	{
		// move until fish reaches to field edge.
		oy = y;
		if (state == STATE_MOVE) {
			Rectangle bounds = mgr.getFieldBounds();
			if (y >= bounds.y + bounds.height - BITMAP_HEIGHT) {
				setState(STATE_GOAWAY);
			}
			else {
				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) {
			appear = false;
			g.drawRectangle(x, oy, BITMAP_WIDTH, BITMAP_HEIGHT
				, Graphics.ERASE, 0);
		}
		else if (y != oy) {
			g.drawRectangle(x, oy, BITMAP_WIDTH, BITMAP_HEIGHT
				, Graphics.ERASE, 0);
		}
		
		// draw bitmap
		int bmid;
		switch(state) {
		case STATE_MOVE:
			bmid = duration & 0x01;
			break;
		case STATE_GOAWAY:
			bmid = 2 + (duration & 0x01);
			break;
		default:
			return;
		}
		g.drawBitmap(x, y, fishBitmap[bmid]);
	}

	/**
	 * Check if fish is eatable.
	 */
	public boolean isEatable()
	{
		return state == STATE_MOVE;
	}
}