[81] | 1 | /* -*- coding: utf-8 -*- |
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| 2 | * |
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| 3 | * Copyright (C) 2010 by Atzm WATANABE <atzm@atzm.org> |
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| 4 | * |
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| 5 | * This program is free software; you can redistribute it and/or modify it |
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| 6 | * under the terms of the GNU General Public License (version 2) as |
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| 7 | * published by the Free Software Foundation. It is distributed in the |
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| 8 | * hope that it will be useful, but WITHOUT ANY WARRANTY; without even the |
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| 9 | * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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| 10 | * PURPOSE. See the GNU General Public License for more details. |
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| 11 | * |
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| 12 | * $Id$ |
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| 13 | * |
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| 14 | */ |
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| 15 | |
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| 16 | var Bullet = function(size, color, x, y, dir, speed) { |
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| 17 | this.size = size; |
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| 18 | this.color = color; |
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| 19 | this.x = x; |
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| 20 | this.y = y; |
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| 21 | this.dir = dir; |
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| 22 | this.speed = speed; |
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| 23 | |
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| 24 | this.draw = function(ctx) { |
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| 25 | ctx.beginPath(); |
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| 26 | ctx.fillStyle = this.color; |
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| 27 | ctx.arc(this.x, this.y, this.size, 0, Math.PI * 2.0, true); |
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| 28 | ctx.fill(); |
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| 29 | ctx.closePath(); |
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| 30 | }; |
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| 31 | this.vanished = function(width, height) { |
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| 32 | return (width < this.x || height < this.y || this.x < 0 || this.y < 0); |
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| 33 | }; |
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| 34 | }; |
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| 35 | |
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| 36 | var LinerBullet = function(size, color, x, y, dir, speed) { |
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| 37 | var that = new Bullet(size, color, x, y, dir, speed); |
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| 38 | |
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| 39 | that.deltaBaseX = Math.cos(that.dir); |
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| 40 | that.deltaBaseY = Math.sin(that.dir); |
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| 41 | |
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| 42 | that.next = function() { |
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| 43 | this.x += this.getDeltaX(); |
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| 44 | this.y += this.getDeltaY(); |
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| 45 | }; |
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| 46 | that.getDeltaX = function() { |
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| 47 | return this.speed * this.deltaBaseX; |
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| 48 | }; |
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| 49 | that.getDeltaY = function() { |
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| 50 | return this.speed * this.deltaBaseY; |
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| 51 | }; |
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| 52 | |
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| 53 | return that; |
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| 54 | }; |
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| 55 | |
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| 56 | var AxisExtendBullet = function(size, color, x, y, dir, speed) { |
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| 57 | var that = new LinerBullet(size, color, x, y, dir, speed); |
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| 58 | |
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| 59 | that.dx = that.speed * that.deltaBaseX / 2; |
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| 60 | that.dy = that.speed * that.deltaBaseY / 2; |
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| 61 | |
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| 62 | that.getDeltaX = function() { |
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| 63 | return this.dx * this.getAxisDeltaX(); |
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| 64 | }; |
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| 65 | that.getDeltaY = function() { |
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| 66 | return this.dy * this.getAxisDeltaY(); |
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| 67 | }; |
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| 68 | that.getCurrentDelta = function(count, thresh) { |
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| 69 | var c = count / this.speed; |
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| 70 | return c > thresh ? thresh : c; |
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| 71 | } |
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| 72 | |
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| 73 | return that; |
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| 74 | }; |
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| 75 | |
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| 76 | var XYExtendBullet = function(size, color, x, y, dir, speed) { |
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| 77 | var that = new AxisExtendBullet(size, color, x, y, dir, speed); |
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| 78 | |
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| 79 | that.i = 1; |
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| 80 | that.getAxisDeltaX = function() { |
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| 81 | return this.getCurrentDelta(this.i, 2); |
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| 82 | }; |
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| 83 | that.getAxisDeltaY = function() { |
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| 84 | return this.getCurrentDelta(this.i++, 2); |
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| 85 | }; |
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| 86 | |
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| 87 | return that; |
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| 88 | }; |
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| 89 | |
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| 90 | var XExtendBullet = function(size, color, x, y, dir, speed) { |
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| 91 | var that = new AxisExtendBullet(size, color, x, y, dir, speed); |
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| 92 | |
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| 93 | that.i = 1; |
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| 94 | that.getAxisDeltaX = function() { |
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| 95 | return this.getCurrentDelta(this.i, 2); |
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| 96 | }; |
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| 97 | that.getAxisDeltaY = function() { |
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| 98 | return 1 / this.getCurrentDelta(this.i++, 2); |
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| 99 | }; |
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| 100 | |
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| 101 | return that; |
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| 102 | }; |
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| 103 | |
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| 104 | var YExtendBullet = function(size, color, x, y, dir, speed) { |
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| 105 | var that = new AxisExtendBullet(size, color, x, y, dir, speed); |
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| 106 | |
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| 107 | that.i = 1; |
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| 108 | that.getAxisDeltaX = function() { |
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| 109 | return 1 / this.getCurrentDelta(this.i, 2); |
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| 110 | }; |
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| 111 | that.getAxisDeltaY = function() { |
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| 112 | return this.getCurrentDelta(this.i++, 2); |
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| 113 | }; |
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| 114 | |
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| 115 | return that; |
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| 116 | }; |
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| 117 | |
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| 118 | var CurveBullet = function(size, color, x, y, dir, speed) { |
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| 119 | var that = new Bullet(size, color, x, y, dir, speed); |
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| 120 | |
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| 121 | that.delta = 1 / (that.speed * 100); |
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| 122 | that.i = 1; |
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| 123 | |
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| 124 | that.next = function() { |
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| 125 | this.x += Math.cos(this.dir) * this.i * this.getSign(); |
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| 126 | this.y += Math.sin(this.dir) * this.i; |
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| 127 | this.dir += (this.delta / this.i); |
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| 128 | this.i += (this.delta / this.i); |
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| 129 | }; |
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| 130 | |
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| 131 | return that; |
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| 132 | }; |
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| 133 | |
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| 134 | var LeftCurveBullet = function(size, color, x, y, dir, speed) { |
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| 135 | var that = new CurveBullet(size, color, x, y, dir, speed); |
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| 136 | |
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| 137 | that.getSign = function() { |
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| 138 | return 1; |
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| 139 | }; |
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| 140 | |
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| 141 | return that; |
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| 142 | }; |
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| 143 | |
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| 144 | var RightCurveBullet = function(size, color, x, y, dir, speed) { |
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| 145 | var that = new CurveBullet(size, color, x, y, dir, speed); |
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| 146 | |
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| 147 | that.getSign = function() { |
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| 148 | return -1; |
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| 149 | }; |
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| 150 | |
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| 151 | return that; |
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| 152 | }; |
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| 153 | |
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| 154 | |
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| 155 | var EnemyBullets = [LinerBullet, |
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| 156 | XYExtendBullet, |
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| 157 | XExtendBullet, |
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| 158 | YExtendBullet, |
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| 159 | LeftCurveBullet, |
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| 160 | RightCurveBullet]; |
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