зеркало из https://github.com/mozilla/pluotsorbet.git
121 строка
3.6 KiB
Java
121 строка
3.6 KiB
Java
/**
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* Copyright 2001 Jean-Francois Doue
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*
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* This file is part of Asteroid Zone. Asteroid Zone is free software;
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* you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or (at your option) any later version.
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* Asteroid Zone is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with Asteroid Zone; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*/
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package asteroids;
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import javax.microedition.lcdui.*;
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/**
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* Class to implement a rocket shot by the player's spaceship.
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* @author Jean-Francois Doue
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* @version 1.4, 2002/10/14
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*/
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public class Rocket extends Mobile {
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/**
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* The orientation of the rocket.
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*/
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public byte angle;
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/**
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* The rockets currently existing in the game
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*/
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public static Pool rockets;
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private int _rangex, _rangey; // The distance travelled by the rocket.
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static {
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// Create and populate the rocket pool.
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Rocket[] array = new Rocket[10];
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for (int i = array.length - 1; i >= 0; i--) {
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array[i] = new Rocket();
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}
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rockets = new Pool(array);
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}
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public Rocket() {
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}
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/**
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* Initializes a Rocket instance by setting its position
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* and angle.
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*/
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public final void init(int x, int y, byte angle, int vx, int vy) {
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moveTo(x, y);
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setVelocity((cos[angle] << 4) + vx, (sin[angle] << 4) + vy);
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this.angle = angle;
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_rangex = 0;
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_rangey = 0;
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}
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/**
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* Move the rockets and remove those which have expired.
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*/
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public static final void move() {
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for (rockets.current = rockets.count - 1; rockets.current >= 0;) {
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Rocket r = (Rocket)rockets.pool[rockets.current--];
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int rangex = r._rangex >> 8;
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int rangey = r._rangey >> 8;
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int maxRange = (((width <= height) ? width : height) * 8) / 10;
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// Determines if the rocket has travelled its maximum distance
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// (80% of the screens smallest dimension).
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if ((rangex * rangex + rangey * rangey) > maxRange * maxRange) {
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rockets.removeCurrent();
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} else {
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r.xold = r.x;
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r.yold = r.y;
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r._x += r.vx;
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r._y += r.vy;
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r.x = r._x >> 8;
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r.y = r._y >> 8;
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// If a border has been hit, wrap the trajectory around
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// the screen. The new origin is the projection of the
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// intersection point on the opposite border.
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if (r.x <= 0) {
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r.moveTo(width - 2, r.y);
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} else if (r.x >= width - 1) {
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r.moveTo(1, r.y);
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} else if (r.y <= 0) {
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r.moveTo(r.x, height - 2);
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} else if (r.y >= height - 1) {
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r.moveTo(r.x, 1);
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}
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// Upgrade the range travelled.
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r._rangex += r.vx;
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r._rangey += r.vy;
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}
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}
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}
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/**
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* Draws all the rockets of the supplied object pool using the
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* specified graphic context.
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*/
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public static final void draw(Graphics g) {
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for (int i = 0; i < rockets.count; i++) {
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Rocket r = (Rocket)rockets.pool[i];
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g.drawLine(r.x, r.y, r.x, r.y);
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}
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}
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}
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