pogoroomidlet.java

手机 3D游戏 供 程序员参考

/******************************************************************************/
/**
 *	@file	PogoRooMIDlet.java
 *	@brief	A simple example of a game using M3G
 *
 *	Copyright (C) 2004 Superscape plc
 *
 *	This file is intended for use as a code example, and
 *	may be used, modified, or distributed in source or
 *	object code form, without restriction, as long as
 *	this copyright notice is preserved.
 *
 *	The code and information is provided "as-is" without
 *	warranty of any kind, either expressed or implied.
 */
/******************************************************************************/

package com.superscape.m3g.wtksamples.pogoroo;

import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.CommandListener;

import java.lang.IllegalArgumentException;
import java.io.IOException;
import java.io.InputStream;
import java.io.ByteArrayOutputStream;
import javax.microedition.lcdui.Image;

import java.util.Timer;
import java.util.TimerTask;

import javax.microedition.m3g.*;

public class PogoRooMIDlet extends MIDlet implements CommandListener
{
 	// UserIDs for objects we use in the scene.
	static final int POGOROO_MOVE_GROUP_TRANSFORM_ID= 554921620;
	static final int CAMERA_GROUP_TRANSFORM_ID 		= 769302310;
	static final int POGOROO_TRANSFORM_ID			= 347178853;
	static final int ROO_BOUNCE_ID 					= 418071423;

	// Key event type IDs
	public static final int KEY_REPEATED = 0;
	public static final int KEY_PRESSED = 1;
	public static final int KEY_RELEASED = 2;

	// Key IDs
	static final int keyNone = 0;
	static final int keyForward = 1;
	static final int keyBackward = 2;
	static final int keyLeft = 3;
	static final int keyRight = 4;

	static final int MaxHops = 10;
	static final float GroundEdge = 9.0f;

	private Display myDisplay = null;
	private PogoRooCanvas myCanvas = null;

	private Timer myRefreshTimer = new Timer();
	private TimerTask myRefreshTask = null;

	private Command exitCommand = new Command("Exit", Command.ITEM, 1);

	Graphics3D myGraphics3D = Graphics3D.getInstance();
	World myWorld = null;

	// Control objects for game play
	// control for 'roo - group transform and cameras

	private AnimationController animRoo = null;
	private Group tRoo = null;
	private Group tCams = null;
	private Group acRoo = null;

	private float dirRoo = 0.0f;
	private float dirCam = 0.0f;

	private int keyMoveRoo = keyNone;
	private int keyTurnRoo = keyNone;

	private int hopCount = 0;
	private int animTime = 0;
	private int animLength = 0;
	private int animLastTime = 0;

	private boolean okToHop = false;

	private float[] posRoo = new float[3];
	private float[] posRooLast = new float[3];
	private float[] posTemp = new float[3];

	private int edgeCount = 0;
	private float turnAngle;

	// lookup table for roo hops
	private float[] hopSteps = {0.0f, 0.0f, 0.0f, 0.0f, 0.0f, 0.05f, 0.1f, 0.2f, 0.1f, 0.05f, 0.0f};

	int viewport_x;
	int viewport_y;
	int viewport_width;
	int viewport_height;

	/**
	 * PogoRooMIDlet - default constructor.
	 */
	public PogoRooMIDlet()
	{
		super();

		// Set up the user interface.
		myDisplay = Display.getDisplay(this);
		myCanvas = new PogoRooCanvas(this);
		myCanvas.setCommandListener(this);
		myCanvas.addCommand(exitCommand);
	}
	
	/**
	 * startApp()
	 */
	public void startApp() throws MIDletStateChangeException
	{
		myDisplay.setCurrent(myCanvas);

		try
		{
			// load the world from the M3D file
			myWorld = (World)Loader.load("/com/superscape/m3g/wtksamples/pogoroo/content/pogoroo.m3g")[0];			
			getObjects();
			setupAspectRatio();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}

		myRefreshTask = new RefreshTask();
		
		// scehdule a repeating timer to give us a framerate of 20fps.
		myRefreshTimer.schedule(myRefreshTask, 0, 50);
	}
	
	/**
	 * Make sure that the content is rendered with the correct aspect ratio.
	 */
	void setupAspectRatio()
	{
		viewport_x = 0;
		viewport_y = 0;
		viewport_width = myCanvas.getWidth();
		viewport_height = myCanvas.getHeight();
		
		Camera cam = myWorld.getActiveCamera();
		
		float[] params = new float[4];
		int type = cam.getProjection(params);
		if(type != Camera.GENERIC)
		{
			//calculate window aspect ratio
			float waspect=viewport_width/viewport_height;

			if (waspect<params[1])
			{
				float height = viewport_width/params[1];
				viewport_height=(int)height;
				viewport_y=(myCanvas.getHeight()-viewport_height)/2;
			}
			else
			{
				float width = viewport_height*params[1];
				viewport_width=(int)width;
				viewport_x=(myCanvas.getWidth()-viewport_width)/2;
			}
		}
	}
	
	/**
	 * getObjects()
	 * get objects from the scene tree for use in the game AI
	 */
	public void getObjects()
	{
		try
		{
			tRoo 	= (Group) myWorld.find(POGOROO_MOVE_GROUP_TRANSFORM_ID);
			tCams 	= (Group) myWorld.find(CAMERA_GROUP_TRANSFORM_ID);
			acRoo 	= (Group) myWorld.find(POGOROO_TRANSFORM_ID);
			animRoo	= (AnimationController) myWorld.find(ROO_BOUNCE_ID);

			// get length of animation
			AnimationTrack track = acRoo.getAnimationTrack(0);
			animLength = 1000; // default length, 1 second
			if (track != null)
			{
				KeyframeSequence ks = track.getKeyframeSequence();
				if (ks != null)
					animLength = ks.getDuration();
			}

		}
		catch(Exception e)
		{
			e.printStackTrace();
		}
	}

	/**
	 * hopRoo()
	 * Hops the roo backwards or forwards
	 */
	private void hopRoo()
	{
		// Move the kangeroo across the ground, but synchronise with animation
		if (animTime == 0) // OK to start!
		{
			hopCount = 0;
			okToHop = true;
		}
		
		// in hopping sequence
		if (okToHop)
		{
			switch(keyMoveRoo)
			{
				case keyForward:
				case keyBackward:
					// move according to direction and increment from look up table 
					// to get nice hop effect
					int oldHopCount = hopCount;
					hopCount = (animTime * 10)/animLength;	
						
					// end of sequence
					if (hopCount >= MaxHops)
					{
						okToHop = false;
						hopCount = MaxHops-1;
					}

					// add up all the steps inbetween positions in animation
					// this code always misses out increment zero, but that's
					// OK because it's zero anyway!
					turnAngle = (dirRoo * 3.14159f) / 180.0f;

					float h = 0f;					
					for (int i = (oldHopCount+1); i <= hopCount; i++)
						h += hopSteps[i];
						
					float x = h * (float)Math.cos(turnAngle);
					float y = h * (float)Math.sin(turnAngle);
					
					if (keyMoveRoo == keyForward)
						tRoo.translate(-x, -y, 0.0f);
					else
						tRoo.translate(x, y, 0.0f);
					break;
			}
		}
	}
	
	/**
	 * checkWorldEdge()
	 * Stops the roo going off the edge of the world
	 */
	private void checkWorldEdge()
	{
		// going off edge of ground
		tRoo.getTranslation(posRoo);
		
		if (edgeCount > 0)
			edgeCount--;
			
		try
		{
			// check to see if we have reached the edge of the world
			if (Math.abs(posRoo[0]) > GroundEdge || Math.abs(posRoo[1]) > GroundEdge)
			{
				edgeCount = 10;
				tRoo.setTranslation(posRooLast[0], posRooLast[1], posRooLast[2]);
			}
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}	
	}
	
	/**
	 * turnRoo()
	 * Turns the roo and makes sure the camera follows.
	 */
	private void turnRoo()
	{
		// turning Roo can happen any time
		switch(keyTurnRoo)
		{
			case keyLeft:
				dirRoo += 5f;
				dirCam -= 5f;
				tRoo.setOrientation(dirRoo, 0, 0, 1);
				tCams.setOrientation(dirCam, 0, 0, 1);
				break;
			case keyRight:
				dirRoo -= 5f;
				dirCam += 5f;
				tRoo.setOrientation(dirRoo, 0, 0, 1);
				tCams.setOrientation(dirCam, 0, 0, 1);
				break;
				
			default:
				if (dirCam > 4.9f)
					dirCam -= 5.0f;
				else if (dirCam < -4.9f)
					dirCam += 5.0f;
				else
					dirCam = 0.0f;
				tCams.setOrientation(dirCam, 0, 0, 1);
				break;
		}
	}
	
	/**
	 * animateRoo()
	 * Makes sure that the hopping animation loops correctly.
	 */
	private void animateRoo(int worldTime)
	{
		// control the kangeroo animation sequence
		if (animLastTime == 0)
			animLastTime = worldTime;

		animTime += (worldTime-animLastTime);
		
		// initialise animation at end of sequence
		if (animTime > animLength) // sequence is ~1000ms
		{
			animRoo.setActiveInterval(worldTime, worldTime+2000);
			animRoo.setPosition(0, worldTime);
			animTime = 0;
		}
		
		// update storage of last position and time
		animLastTime = worldTime;	
	}
	
	/**
	 * moveRoo()
	 * Act on key presses and any collision detection to move the kangeroo
	 */
	private void moveRoo(int worldTime)
	{
		hopRoo();
				
		checkWorldEdge();
		
		turnRoo();
	
		animateRoo(worldTime);

		tRoo.getTranslation(posRooLast);
	}
	
	/**
	 * pauseApp()
	 */
	public void pauseApp()
	{
	}

	/**
	 * destroyApp()
	 */
	public void destroyApp(boolean unconditional) throws MIDletStateChangeException
	{	
		myRefreshTimer.cancel();
		myRefreshTimer = null;
		myRefreshTask = null;
	}

	/**
	 * MIDlet paint method.
	 */
	public void paint(Graphics g)
	{
		// clear any area of the screen that is not drawn to by m3g
		if(g.getClipWidth() != viewport_width ||
		   g.getClipHeight() != viewport_height ||
		   g.getClipX() != viewport_x ||
		   g.getClipY() != viewport_y)
		{
			g.setColor(0x00);
			g.fillRect(0, 0, myCanvas.getWidth(), myCanvas.getHeight());
		}

		// render the 3D scene
		if ((myGraphics3D != null) && (myWorld != null))
		{
			myGraphics3D.bindTarget(g);
			myGraphics3D.setViewport(viewport_x, viewport_y, viewport_width, viewport_height);
			myGraphics3D.render(myWorld);
			myGraphics3D.releaseTarget();
		}
	}

	/**
	 * MIDlet keyEvent method.
	 */
	public void keyEvent(int type, int keyCode)
	{
		switch(type)
		{
			case KEY_REPEATED : break;
			case KEY_PRESSED :
				// game movement keys -	Roo requires synchronised move with animation, 
				// so can only accept key press when last move is complete
				if (keyMoveRoo == keyNone)
				{
					switch(myCanvas.getGameAction(keyCode))
					{
						case Canvas.FIRE: break;
						case Canvas.UP: keyMoveRoo = keyForward; break;
						case Canvas.DOWN: keyMoveRoo = keyBackward; break;
					}
					
					if (keyMoveRoo != keyNone)
						hopCount = MaxHops;
				}

				// Roo can turn when it likes
				switch(myCanvas.getGameAction(keyCode))
				{
					case Canvas.LEFT: keyTurnRoo = keyLeft; break;
					case Canvas.RIGHT: keyTurnRoo = keyRight; break;
				}
					
				break;
			case KEY_RELEASED :
				switch(myCanvas.getGameAction(keyCode))
				{
					case Canvas.LEFT: //intentional fall through
					case Canvas.RIGHT: keyTurnRoo = keyNone; break;
					case Canvas.UP: //intentional fall through
					case Canvas.DOWN: keyMoveRoo = keyNone; break;
				}
				break;
			default :
				throw new IllegalArgumentException();
		}
	}

	/**
	 * Handle commands.
	 */
	public void commandAction(Command cmd, Displayable disp)
	{
		if (cmd == exitCommand)
		{
			try
			{
				destroyApp(false);
				notifyDestroyed();
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
		}
	}

	/**
	 * Inner class for refreshing the view.
	 */
	private class RefreshTask extends TimerTask
	{
		public void run()
		{
			// Get the canvas to repaint itself.
			if(myCanvas != null && myGraphics3D != null && myWorld != null)
			{
				int startTime = (int)System.currentTimeMillis();
				// update the control and game AI
				moveRoo(startTime);
				// Update the world to the current time.
				int validity = myWorld.animate(startTime);
				// Cause a repaint
				myCanvas.repaint(viewport_x, viewport_y, viewport_width, viewport_height);
			}
		}
	}

	/**
	 * Inner class for handling the canvas.
	 */
	class PogoRooCanvas extends Canvas
	{
		PogoRooMIDlet myRooMIDlet;

		/**
		 * Construct a new canvas
		 */
		PogoRooCanvas(PogoRooMIDlet Testlet) { myRooMIDlet = Testlet; }

		/**
		 * Initialize self.
		 */
		void init() { }

		/**
		 * Cleanup and destroy.
		 */
		void destroy() { }

		/*
		 * Ask myRooMIDlet to paint itself
		 */
		protected void paint(Graphics g) { myRooMIDlet.paint(g); }

		/*
		 * Ask myRooMIDlet to handle keyPressed events
		 */
		protected void keyPressed(int keyCode) { myRooMIDlet.keyEvent(myRooMIDlet.KEY_PRESSED, keyCode); }

		/*
		 * Ask myRooMIDlet to handle keyReleased events
		 */
		protected void keyReleased(int keyCode) { myRooMIDlet.keyEvent(myRooMIDlet.KEY_RELEASED, keyCode); }

		/*
		 * Ask myRooMIDlet to handle keyRepeated events
		 */
		protected void keyRepeated(int keyCode) { myRooMIDlet.keyEvent(myRooMIDlet.KEY_REPEATED, keyCode); }

		/*
		 * Ask myRooMIDlet to handle pointerDragged events
		 */
		protected void pointerDragged(int x, int y) { }

		/*
		 * Ask myRooMIDlet to handle pointerPressed events
		 */
		protected void pointerPressed(int x, int y) { }

		/*
		 * Ask myRooMIDlet to handle pointerReleased events
		 */
		protected void pointerReleased(int x, int y) { }
	}
}