/**
* Copyright 2001 Jean-Francois Doue
*
* This file is part of Asteroid Zone. Asteroid Zone is free software;
* you can redistribute it and/or modify it under the terms of the
* GNU General Public License as published by the Free Software Foundation;
* either version 2 of the License, or (at your option) any later version.
* Asteroid Zone is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with Asteroid Zone; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*/
package asteroids;
import javax.microedition.lcdui.*;
import java.util.*;
/**
* Class to represent an explosion.
* @author Jean-Francois Doue
* @version 1.0, 2001/07/26
*/
public class Explosion extends Object {
public static byte[] xcoords;
public static byte[] ycoords;
private int _frame, _x, _y;
private static final int MAX_FRAME = 6;
public static Pool explosions;
static {
// Create and populate the explosion pool.
Explosion[] array = new Explosion[10];
for (int i = array.length - 1; i >= 0; i--) {
array[i] = new Explosion();
}
explosions = new Pool(array);
// Pre-compute the explosion images
int[] Xcoords = new int[8];
int[] Ycoords = new int[8];
for (int i = 0; i < 8; i++) {
Xcoords[i] = Mobile.cos[i << 2] * (Math.abs(Game.random.nextInt()) % 12);
Ycoords[i] = Mobile.sin[i << 2] * (Math.abs(Game.random.nextInt()) % 12);
}
xcoords = new byte[48];
ycoords = new byte[48];
for (int i = 0; i < Explosion.MAX_FRAME; i++) {
int offset = i << 3;
for (int j = 0; j < 8; j++) {
xcoords[offset + j] = (byte)(Xcoords[j] >> 8);
ycoords[offset + j] = (byte)(Ycoords[j] >> 8);
Xcoords[j] += Mobile.cos[j << 2] << 2;
Ycoords[j] += Mobile.sin[j << 2] << 2;
}
}
}
public Explosion() {
}
public final void init(int x, int y) {
_x = x;
_y = y;
_frame = 0;
}
/**
* Animate the explosion and remove those which are done.
*/
public static final void explode() {
for (explosions.current = explosions.count - 1; explosions.current >= 0;) {
Explosion e = (Explosion)explosions.pool[explosions.current--];
e._frame++;
if (e._frame >= Explosion.MAX_FRAME) {
explosions.removeCurrent();
}
}
}
/**
* Draw all the explosions using the supplied context.
*/
public static final void draw(Graphics g) {
for (int i = 0; i < explosions.count; i++) {
Explosion e = (Explosion)explosions.pool[i];
int offset = e._frame << 3;
for (int j = 0; j < 8; j++) {
g.drawLine(
e._x + xcoords[j + offset],
e._y + ycoords[j + offset],
e._x + xcoords[j + offset],
e._y + ycoords[j + offset]);
}
}
}
}