6815fe7a0a
This class iterates recursively over layers, flattening groups. This enables us to simplify the code when we iterate layers. We can remove all recursive function calls in the GameScene code (it is delegated to the LayersIterator)
44 lines
1.3 KiB
TypeScript
44 lines
1.3 KiB
TypeScript
import {ITiledMap, ITiledMapLayer} from "./ITiledMap";
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/**
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* Iterates over the layers of a map, flattening the grouped layers
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*/
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export class LayersIterator implements IterableIterator<ITiledMapLayer> {
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private layers: ITiledMapLayer[] = [];
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private pointer: number = 0;
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constructor(private map: ITiledMap) {
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this.initLayersList(map.layers, '');
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}
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private initLayersList(layers : ITiledMapLayer[], prefix : string) {
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for (const layer of layers) {
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if (layer.type === 'group') {
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this.initLayersList(layer.layers, prefix + layer.name + '/');
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} else {
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const layerWithNewName = { ...layer };
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layerWithNewName.name = prefix+layerWithNewName.name;
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this.layers.push(layerWithNewName);
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}
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}
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}
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public next(): IteratorResult<ITiledMapLayer> {
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if (this.pointer < this.layers.length) {
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return {
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done: false,
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value: this.layers[this.pointer++]
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}
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} else {
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return {
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done: true,
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value: null
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}
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}
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}
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[Symbol.iterator](): IterableIterator<ITiledMapLayer> {
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return new LayersIterator(this.map);
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}
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}
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