workadventure/front/src/Phaser/Game/GameMap.ts

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