105 lines
3.4 KiB
TypeScript
105 lines
3.4 KiB
TypeScript
/**
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* An actionable item represents an in-game object that can be activated using the space-bar.
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* It has coordinates and an "activation radius"
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*/
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import Sprite = Phaser.GameObjects.Sprite;
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import type { GameScene } from "../Game/GameScene";
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import type OutlinePipelinePlugin from "phaser3-rex-plugins/plugins/outlinepipeline-plugin.js";
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type EventCallback = (state: unknown, parameters: unknown) => void;
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export class ActionableItem {
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private readonly activationRadiusSquared: number;
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private isSelectable: boolean = false;
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private callbacks: Map<string, Array<EventCallback>> = new Map<string, Array<EventCallback>>();
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public constructor(
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private id: number,
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private sprite: Sprite,
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private eventHandler: GameScene,
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private activationRadius: number,
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private onActivateCallback: (item: ActionableItem) => void
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) {
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this.activationRadiusSquared = activationRadius * activationRadius;
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}
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public getId(): number {
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return this.id;
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}
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/**
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* Returns the square of the distance to the object center IF we are in item action range
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* OR null if we are out of range.
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*/
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public actionableDistance(x: number, y: number): number | null {
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const distanceSquared = (x - this.sprite.x) * (x - this.sprite.x) + (y - this.sprite.y) * (y - this.sprite.y);
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if (distanceSquared < this.activationRadiusSquared) {
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return distanceSquared;
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} else {
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return null;
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}
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}
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/**
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* Show the outline of the sprite.
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*/
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public selectable(): void {
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if (this.isSelectable) {
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return;
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}
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this.isSelectable = true;
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this.getOutlinePlugin()?.add(this.sprite, {
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thickness: 2,
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outlineColor: 0xffff00,
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});
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}
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/**
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* Hide the outline of the sprite
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*/
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public notSelectable(): void {
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if (!this.isSelectable) {
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return;
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}
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this.isSelectable = false;
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this.getOutlinePlugin()?.remove(this.sprite);
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}
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private getOutlinePlugin(): OutlinePipelinePlugin | undefined {
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return this.sprite.scene.plugins.get("rexOutlinePipeline") as unknown as OutlinePipelinePlugin | undefined;
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}
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/**
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* Triggered when the "space" key is pressed and the object is in range of being activated.
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*/
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public activate(): void {
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this.onActivateCallback(this);
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}
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public emit(eventName: string, state: unknown, parameters: unknown = null): void {
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this.eventHandler.emitActionableEvent(this.id, eventName, state, parameters);
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// Also, execute the action locally.
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this.fire(eventName, state, parameters);
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}
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public on(eventName: string, callback: EventCallback): void {
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let callbacksArray: Array<EventCallback> | undefined = this.callbacks.get(eventName);
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if (callbacksArray === undefined) {
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callbacksArray = new Array<EventCallback>();
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this.callbacks.set(eventName, callbacksArray);
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}
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callbacksArray.push(callback);
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}
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public fire(eventName: string, state: unknown, parameters: unknown): void {
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const callbacksArray = this.callbacks.get(eventName);
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if (callbacksArray === undefined) {
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return;
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}
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for (const callback of callbacksArray) {
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callback(state, parameters);
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}
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}
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}
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