95 lines
3.4 KiB
TypeScript
95 lines
3.4 KiB
TypeScript
module SpaceTac.View {
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"use strict";
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// Particle that is rotated to always face its ongoing direction
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class BulletParticle extends Phaser.Particle {
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update(): void {
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super.update();
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this.rotation = Math.atan2(this.body.velocity.y, this.body.velocity.x);
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}
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}
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// Renderer of visual effects for a weapon fire
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export class WeaponEffect {
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// Arena in which to display the effect
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private arena: Arena;
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// Firing ship
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private source: Game.Target;
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// Targetted ship
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private destination: Game.Target;
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// Weapon class code (e.g. GatlingGun, ...)
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private weapon: string;
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// Effect in use
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private effect: Function;
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constructor(arena: Arena, source: Game.Target, destination: Game.Target, weapon: string) {
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this.arena = arena;
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this.source = source;
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this.destination = destination;
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this.weapon = weapon;
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this.effect = this.getEffectForWeapon(weapon);
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}
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// Start the visual effect
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start(): void {
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if (this.effect) {
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this.effect.call(this);
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}
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}
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// Get the function that will be called to start the visual effect
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getEffectForWeapon(weapon: string): Function {
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switch (weapon) {
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case "gatlinggun":
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return this.gunEffect;
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default:
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return this.defaultEffect;
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}
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}
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// Default firing effect (missile)
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private defaultEffect(): void {
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var missile = new Phaser.Sprite(this.arena.game, this.source.x, this.source.y, "battle-weapon-bullet");
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missile.anchor.set(0.5, 0.5);
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missile.scale.set(0.2, 0.2);
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missile.rotation = this.source.getAngleTo(this.destination);
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this.arena.addChild(missile);
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var tween = this.arena.game.tweens.create(missile);
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tween.to({x: this.destination.x, y: this.destination.y}, 1000);
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tween.onComplete.addOnce(() => {
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missile.destroy();
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});
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tween.start();
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}
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// Submachine gun effect (small chain of bullets)
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private gunEffect(): void {
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this.arena.getGame().audio.playOnce("battle-weapon-bullets");
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var source = this.arena.toGlobal(new PIXI.Point(this.source.x, this.source.y));
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var destination = this.arena.toGlobal(new PIXI.Point(this.destination.x, this.destination.y));
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var dx = destination.x - source.x;
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var dy = destination.y - source.y;
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var angle = Math.atan2(dy, dx);
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var distance = Math.sqrt(dx * dx + dy * dy);
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var emitter = new Phaser.Particles.Arcade.Emitter(this.arena.game, source.x, source.y, 10);
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var speed = 5000;
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var scale = 0.1;
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emitter.particleClass = BulletParticle;
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emitter.gravity = 0;
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emitter.setRotation(0, 0);
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emitter.minParticleSpeed.set(Math.cos(angle) * speed, Math.sin(angle) * speed);
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emitter.maxParticleSpeed.set(Math.cos(angle) * speed, Math.sin(angle) * speed);
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emitter.minParticleScale = scale;
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emitter.maxParticleScale = scale;
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emitter.makeParticles(["battle-weapon-bullet"]);
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emitter.start(false, 1000 * distance / speed, 50, 10);
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}
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}
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}
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