122 lines
2.6 KiB
JavaScript
122 lines
2.6 KiB
JavaScript
import * as I from 'immutable';
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import {compose} from '@avocado/core';
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import {Rectangle, Vector} from '@avocado/math';
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import {EventEmitter} from '@avocado/mixins';
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const decorate = compose(
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EventEmitter,
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Vector.Mixin('size', 'width', 'height', {
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default: [0, 0],
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}),
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);
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export class Tiles extends decorate(class {}) {
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constructor() {
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super();
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this.data = I.List();
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this._state = I.Map();
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}
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patchState(patch) {
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for (const {op, path, value} of patch) {
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if ('/' === path) {
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if (value.width) {
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this.width = value.width;
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}
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if (value.height) {
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this.height = value.height;
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}
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if (value.data) {
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const oldData = this.data;
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for (const i in value.data) {
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const index = parseInt(i);
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this.data = this.data.set(index, value.data[i]);
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}
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if (oldData !== this.data) {
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this.emit('dataChanged');
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}
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}
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}
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}
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}
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fromJSON(json) {
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if (json.size) {
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this.size = json.size;
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}
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if (json.data) {
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this.data = I.fromJS(json.data);
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}
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return this;
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}
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get rectangle() {
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return Rectangle.compose([0, 0], this.size);
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}
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setTileAt(x, y, tile) {
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const oldTile = this.tileAt(x, y);
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if (oldTile === tile) {
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return;
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}
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const index = y * this.width + x;
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if (index < 0 || index >= this.data.size) {
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return;
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}
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this.data = this.data.set(index, tile);
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this.emit('dataChanged');
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}
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slice(rectangle) {
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const tilesRectangle = this.rectangle;
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// Get intersection.
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if (!Rectangle.intersects(rectangle, tilesRectangle)) {
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return [];
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}
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let [x, y, sliceWidth, sliceHeight] = Rectangle.intersection(
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rectangle,
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tilesRectangle,
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);
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// No muls in the loop.
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let sliceRow = y * sliceWidth;
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const dataWidth = this.width;
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let dataRow = y * dataWidth;
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// Copy slice.
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const slice = new Array(sliceWidth * sliceHeight);
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for (let j = 0; j < sliceHeight; ++j) {
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for (let i = 0; i < sliceWidth; ++i) {
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slice[sliceRow + x] = this.data.get(dataRow + x);
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x++;
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}
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sliceRow += sliceWidth;
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dataRow += dataWidth;
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x -= sliceWidth;
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}
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return slice;
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}
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get state() {
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return this._state;
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}
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tick(elapsed) {
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this._state = this._state.set('width', this.width);
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this._state = this._state.set('height', this.height);
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this._state = this._state.set('data', this.data);
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}
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tileAt(x, y) {
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return this.data.get(y * this.width + x);
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}
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toJSON() {
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return {
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size: [...this.size],
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data: [...this.data.toJS()],
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};
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}
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}
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