isoj2mecanvas.java

j2me游戏开发引擎的实例程序

import isoj2me.*;
import com.nokia.mid.ui.*;
import javax.microedition.lcdui.*;
import java.io.*;

/**
 * <p>Title: isoj2me: J2ME Isometric Engine</p>
 * <p>Description: An engine/framework for isometric games (like japanese RPGs) for mobile devices supporting J2ME (MIDP 1.0). This engine will manage maps, objects and characters. Visit http://sourceforge.net/projects/isoj2me</p>
 * <p>Copyright: Copyright (c) 2004</p>
 * <p>License: Lesser GPL (http://www.gnu.org)</p>
 * <p>Company: Mondonerd.com</p>
 * @author Massimo Maria Avvisati
 * @version 0.1
 */

public class isoj2meCanvas
    extends FullCanvas
    implements Runnable {
  int x = 0;
  int y = 0;
  private volatile Thread t = null; //This is used to start and stop the canvas
  private int delay = 20; //Refresh time for this canvas used in the run() method

  private Board board = new Board("city");
  private isoj2me.Character player = new isoj2me.Character();
  private isoj2me.Item candle = new isoj2me.Item();

  public isoj2meCanvas() {
    t = new Thread(this);
    t.start();
    board.setTileSize(32, 8);
    board.createMap("/map_layer", 6);
    candle.putAction("candle", 2);
    candle.setCurrentAction("candle");
    candle.x = 6;
    candle.y = 5;
    candle.z = 0;
    board.putItem(candle);
    player.putAction("standSW", 0);
    player.putAction("standNW", 0);
    player.putAction("standSE", 0);
    player.putAction("standNE", 0);

    player.putAction("walkSW", 1);
    player.putAction("walkNW", 1);
    player.putAction("walkSE", 1);
    player.putAction("walkNE", 1);
    player.setCurrentAction("standSW");

    isoj2me.Character c = new isoj2me.Character("Sarah");
    c.putAction("girlstandSW", 0);
    c.setCurrentAction("girlstandSW");
    c.x = 7;
    c.y = 5;
    c.z = 0;
    board.putCharacter(c);
    player.x = 3;
    player.y = 3;
    player.z = 0;

    board.putCharacter(player);

  }

  private boolean canGo(int x, int y, int z, int oldX, int oldY, int oldZ) {
    if (board.isCharacter(x, y, z) != null || board.isItem(x, y, z) != null) {
      return false;
    }
    if ( ( (board.map.getCell(z, x, y) == 49 ||
	    board.map.getCell(z, x, y) == 56) &&
	  (board.map.getCell(z + 1, x, y) == 49 ||
	   board.map.getCell(z + 1, x, y) == 56) &&
	  board.map.getCell(z + 2, x, y) == 48) ||

	( (board.map.getCell(z - 1, x, y) == 49 ||
	   board.map.getCell(z - 1, x, y) == 56) &&
	 board.map.getCell(z, x, y) == 48 &&
	 board.map.getCell(z + 1, x, y) == 48) ||

	( (board.map.getCell(z, x, y) == 49 || board.map.getCell(z, x, y) == 56) &&
	 board.map.getCell(z + 1, x, y) == 48 &&
	 board.map.getCell(z + 2, x, y) == 48)) {
      //System.out.println("can go!");
      return true;
    }
    else {
      //System.out.println("cannot go!");
      //System.out.println("z + 2 = " + board.map.getCell(z + 2, x, y));
      //System.out.println("z + 1 = " + board.map.getCell(z + 1, x, y));
      //System.out.println("z = " + board.map.getCell(z, x, y));
      //System.out.println("z - 1 = " + board.map.getCell(z - 1, x, y));

      return false;
    }
  }

  public void keyPressed(int keyCode) {
    int newX, newY, newZ, oldX, oldY, oldZ;
    oldX = player.x;
    oldY = player.y;
    oldZ = player.z;

    newX = player.x;
    newY = player.y;
    newZ = player.z;

    int incX = 0;
    int incY = 0;
    if (keyCode == KEY_NUM0) {
      System.out.println("x: " + player.x + " y: " + player.y + " z: " +
			 player.z + " tile: " +
			 board.map.getCell(player.z, player.x, player.z));
    }

    if (keyCode == KEY_NUM2 || keyCode == -1) {
      newY = player.y - 1;
      incY = -1;
      player.setCurrentAction("walkNE");

    }
    if (keyCode == KEY_NUM4 || keyCode == -3) {
      newX = player.x - 1;
      incX = -1;
      player.setCurrentAction("walkNW");

    }

    if (keyCode == KEY_NUM6 || keyCode == -4) {
      newX = player.x + 1;
      incX = 1;
      player.setCurrentAction("walkSE");
    }

    if (keyCode == KEY_NUM8 || keyCode == -2) {
      newY = player.y + 1;
      incY = 1;
      player.setCurrentAction("walkSW");

    }
    if (canGo(newX, newY, newZ, oldX, oldY, oldZ)) {
      player.x = newX;
      player.y = newY;
      player.z = newZ;
      x = x + incX;
      y = y + incY;
      board.moveCharacter(player, oldX, oldY, oldZ, player.x, player.y,
			  player.z, false);
    }
  }

  private void updatePlayer() {

    if (board.map.getCell(player.z + 1, player.x, player.y) == 49) {

      board.moveCharacter(player, player.x, player.y, player.z, player.x,
			  player.y, player.z + 1, false);
      player.z++;
    }
    if (board.map.getCell(player.z, player.x, player.y) == 48) {
      board.moveCharacter(player, player.x, player.y, player.z, player.x,
			  player.y, player.z - 1, false);
      player.z--;
    }

  }

  protected void paint(Graphics g) {
    updatePlayer();
    g.setColor(0x9999cc);
    g.fillRect(0, 0, getWidth(), getHeight());

    board.draw(getWidth() / 2 - 16, 0, x, y, 5, 5, g);

    if (player.getCurrentAction().equals("walkSW")) {
      player.setCurrentAction("standSW");
    }
    if (player.getCurrentAction().equals("walkSE")) {
      player.setCurrentAction("standSE");
    }
    if (player.getCurrentAction().equals("walkNW")) {
      player.setCurrentAction("standNW");
    }
    if (player.getCurrentAction().equals("walkNE")) {
      player.setCurrentAction("standNE");
    }

  }

  public void run() {
    Thread current = Thread.currentThread();
    while (current == t) {

      repaint();
      serviceRepaints();

      try {
	Thread.sleep(delay);
      }
      catch (InterruptedException ex) {
      }

    }

  }
}