98 lines
3.5 KiB
TypeScript
98 lines
3.5 KiB
TypeScript
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import {ITiledMap} from "../Map/ITiledMap";
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export type PropertyChangeCallback = (oldValue: string | number | boolean | undefined, newValue: string | number | boolean | undefined) => void;
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/**
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* A wrapper around a ITiledMap interface to provide additional capabilities.
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* It is used to handle layer properties.
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*/
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export class GameMap {
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private key: number|undefined;
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private lastProperties = new Map<string, string|boolean|number>();
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private callbacks = new Map<string, Array<PropertyChangeCallback>>();
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public constructor(private map: ITiledMap) {
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}
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/**
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* Sets the position of the current player (in pixels)
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* This will trigger events if properties are changing.
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*/
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public setPosition(x: number, y: number) {
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const xMap = Math.floor(x / this.map.tilewidth);
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const yMap = Math.floor(y / this.map.tileheight);
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const key = xMap + yMap * this.map.width;
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if (key === this.key) {
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return;
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}
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this.key = key;
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const newProps = this.getProperties(key);
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const oldProps = this.lastProperties;
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// Let's compare the 2 maps:
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// First new properties vs oldProperties
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for (const [newPropName, newPropValue] of newProps.entries()) {
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const oldPropValue = oldProps.get(newPropName);
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if (oldPropValue !== newPropValue) {
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this.trigger(newPropName, oldPropValue, newPropValue);
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}
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}
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for (const [oldPropName, oldPropValue] of oldProps.entries()) {
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if (!newProps.has(oldPropName)) {
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// We found a property that disappeared
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this.trigger(oldPropName, oldPropValue, undefined);
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}
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}
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this.lastProperties = newProps;
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}
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private getProperties(key: number): Map<string, string|boolean|number> {
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const properties = new Map<string, string|boolean|number>();
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for (const layer of this.map.layers) {
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if (layer.type !== 'tilelayer') {
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continue;
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}
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const tiles = layer.data as number[];
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if (tiles[key] == 0) {
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continue;
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}
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// There is a tile in this layer, let's embed the properties
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if (layer.properties !== undefined) {
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for (const layerProperty of layer.properties) {
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if (layerProperty.value === undefined) {
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continue;
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}
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properties.set(layerProperty.name, layerProperty.value);
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}
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}
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}
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return properties;
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}
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private trigger(propName: string, oldValue: string | number | boolean | undefined, newValue: string | number | boolean | undefined) {
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let callbacksArray = this.callbacks.get(propName);
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if (callbacksArray !== undefined) {
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for (const callback of callbacksArray) {
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callback(oldValue, newValue);
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}
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}
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}
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/**
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* Registers a callback called when the user moves to a tile where the property propName is different from the last tile the user was on.
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*/
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public onPropertyChange(propName: string, callback: PropertyChangeCallback) {
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let callbacksArray = this.callbacks.get(propName);
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if (callbacksArray === undefined) {
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callbacksArray = new Array<PropertyChangeCallback>();
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this.callbacks.set(propName, callbacksArray);
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}
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callbacksArray.push(callback);
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}
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}
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