92 lines
3.1 KiB
TypeScript
92 lines
3.1 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 {OutlinePipeline} from "../Shaders/OutlinePipeline";
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import {GameScene} from "../Game/GameScene";
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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(private id: number, private sprite: Sprite, private eventHandler: GameScene, private activationRadius: number, private onActivateCallback: (item: ActionableItem) => void) {
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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.sprite.setPipeline(OutlinePipeline.KEY);
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this.sprite.pipeline.set2f('uTextureSize', this.sprite.texture.getSourceImage().width, this.sprite.texture.getSourceImage().height);
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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.sprite.resetPipeline();
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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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