retainedmodemidlet.java

手机 3D游戏 供 程序员参考

/******************************************************************************/
/**
 *	@file	RetainModeMidlet.java
 *	@brief	A simple example of a retained mode M3G midlet
 *
 *	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.retainedmode;

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 RetainedModeMidlet extends MIDlet implements CommandListener
{
	private Display myDisplay = null;
	private JesterCanvas 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;

	private long worldStartTime = 0;
	
	int viewport_x;
	int viewport_y;
	int viewport_width;
	int viewport_height;
	
	int currentContent = 0;

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

		// Set up the user interface.
		myDisplay = Display.getDisplay(this);
		myCanvas = new JesterCanvas(this);
		myCanvas.setCommandListener(this);
		myCanvas.addCommand(exitCommand);
	}

	/**
	 * startApp()
	 */
	public void startApp() throws MIDletStateChangeException
	{
		myDisplay.setCurrent(myCanvas);

		try
		{
			myWorld = (World)Loader.load("/com/superscape/m3g/wtksamples/retainedmode/content/swerve.m3g")[0];
			setupAspectRatio();
		}
		catch(Exception e)
		{
			e.printStackTrace();
		}

		worldStartTime = System.currentTimeMillis();

		myCanvas.repaint();
	}

	/**
	 * pauseApp()
	 */
	public void pauseApp()
	{
		// System.out.println("pauseApp()");
	}

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

	/**
	 * MIDlet paint method.
	 */
	public void paint(Graphics g)
	{
		if(myCanvas == null || myGraphics3D == null || myWorld == null)
			return;
		
		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());
		}

		// Delete any pending refresh tasks.
		if(myRefreshTask != null)
		{
			myRefreshTask.cancel();
			myRefreshTask = null;
		}

		// Update the world to the current time.
		long startTime = System.currentTimeMillis() - worldStartTime;
		
		if(currentContent == 0 && startTime > 5000)
		{
			currentContent++;
			try
			{
				myWorld = (World)Loader.load("/com/superscape/m3g/wtksamples/retainedmode/content/skaterboy.m3g")[0];
				setupAspectRatio();
			}
			catch(Exception e)
			{
				e.printStackTrace();
			}
			
			g.setColor(0x00);
			g.fillRect(0,0,myCanvas.getWidth(), myCanvas.getHeight());
		}
		
		// update any animations in the world
		int validity = myWorld.animate((int)startTime);

		// render the 3d scene
		myGraphics3D.bindTarget(g);
		myGraphics3D.setViewport(viewport_x, viewport_y, viewport_width, viewport_height);
		myGraphics3D.render(myWorld);
		myGraphics3D.releaseTarget();

		if(validity < 1)
		{	// The validity too small; allow a minimum of 1ms.
			validity = 1;
		}

		if(validity == 0x7fffffff)
		{	// The validity is infinite; scehdule a refresh in 1 second.
			myRefreshTask = new RefreshTask();
			myRefreshTimer.schedule(myRefreshTask, 1000);
		}
		else
		{	// Schedule a refresh task.

			// Create a new refresh task.
			myRefreshTask = new RefreshTask();
			// Schedule an update.
			myRefreshTimer.schedule(myRefreshTask, validity);
		}
	}

	/**
	 * 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.
			myCanvas.repaint(viewport_x, viewport_y, viewport_width, viewport_height);
		}
	}

	/**
	 * Inner class for handling the canvas.
	 */
	class JesterCanvas extends Canvas
	{
		RetainedModeMidlet myTestlet;

		/**
		 * Construct a new canvas
		 */
		JesterCanvas(RetainedModeMidlet Testlet) { myTestlet = Testlet; }

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

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

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

		/*
		 * Ask myTestlet to handle keyPressed events
		 */
		protected void keyPressed(int keyCode) {}

		/*
		 * Ask myTestlet to handle keyReleased events
		 */
		protected void keyReleased(int keyCode) {}

		/*
		 * Ask myTestlet to handle keyRepeated events
		 */
		protected void keyRepeated(int keyCode) {}

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

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

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

}