source: pycodeshooter/trunk/shooter/trooper.js @ 81

/* -*- coding: utf-8 -*-
 *
 * Copyright (C) 2010 by Atzm WATANABE <atzm@atzm.org>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License (version 2) as
 *  published by the Free Software Foundation.  It 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.
 *
 * $Id$
 *
 */

var Trooper = function(name, actList, size, color, x, y, w, h,
                       life, speed, barrages) {

    this.bullets  = new Array();
    this.name     = name;
    this.actList  = actList;
    this.size     = size;
    this.color    = color;
    this.x        = x;
    this.y        = y;
    this.w        = w;
    this.h        = h;
    this.life     = life;
    this.speed    = speed;
    this.barrages = barrages;

    this.move = function(x, y) {
        this.x += x;
        this.y += y;
        this.adjustPosition();
    };

    this.moveAbs = function(x, y) {
        this.x = x;
        this.y = y;
        this.adjustPosition();
    };

    this.adjustPosition = function() {
        if (this.x > this.w)
            this.x = this.w;

        if (this.y > this.h)
            this.y = this.h;

        if (this.x < 0)
            this.x = 0;

        if (this.y < 0)
            this.y = 0;
    };

    this.isDead = function() {
        return this.life <= 0;
    };

    this.update = function(enemy) {
        var delIdx = null;

        // update my action
        this.actList.update(this, enemy);

        // update/delete my bullets
        delIdx = new Array();
        for (i = 0; i < this.bullets.length; i++) {
            this.bullets[i].next();

            if (this.bullets[i].vanished())
                delIdx.push(i);
        }
        this.delBullet(delIdx);

        // judge/delete hit bullets
        delIdx = new Array();
        for (i = 0; i < enemy.bullets.length; i++) {
            var dx = Math.pow(enemy.bullets[i].x - this.x, 2);
            var dy = Math.pow(enemy.bullets[i].y - this.y, 2);

            if (Math.sqrt(dx + dy) < this.size + enemy.bullets[i].size)
                delIdx.push(i);
        }
        enemy.delBullet(delIdx)

        // update life
        if (delIdx.length > 0 && this.life > 0)
            this.life--;
    };

    this.draw = function(ctx) {
        // draw trooper
        ctx.beginPath();
        ctx.fillStyle = this.color;
        ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2.0, true);
        ctx.fill();
        ctx.closePath();

        // draw bullets
        for (i = 0; i < this.bullets.length; i++)
            this.bullets[i].draw(ctx);
    };

    this.addBullet = function(bulletType, size, color, x, y, dir, speed) {
        this.bullets.push(
            new bulletType(size, color, this.x + x, this.y + y, dir, speed));
    };

    this.delBullet = function(idx) {
        if (idx.length <= 0)
            return;

        var newBullets = new Array();

        for (i = 0; i < idx.length; i++)
            this.bullets[idx[i]] = null;

        for (i = 0; i < this.bullets.length; i++)
            if (this.bullets[i])
                newBullets.push(this.bullets[i]);

        this.bullets = newBullets;
    };
}