smartgame/js/Texture.js

import Rect from "./Rect.js";
import assets from "./assets.js";

export default class Texture {
	constructor(sheet, nestedArr) {
		this.sheet = sheet;
		this.nestedArr = nestedArr;
		this.can = document.createElement("canvas");
		this.ctx = this.can.getContext("2d");
		this.width = 0;
		this.height = 0;

		this.sheet.whenReady(() => this.init());
	}

	findWidthHeight(arr) {
		arr.forEach(e => {
			if (e instanceof Array) {
				this.findWidthHeight(e);
			} else {
				let right = (e.x + 1) * this.sheet.tileWidth;
				let bottom = (e.y + 1) * this.sheet.tileHeight;
				if (right > this.width)
					this.width = right;
				if (bottom > this.height)
					this.height = bottom;
			}
		});
	}

	fillCanvas(arr) {
		arr.forEach(e => {
			if (e instanceof Array) {
				this.fillCanvas(e);
			} else {
				this.sheet.drawTile(this.ctx, e.name, e.x, e.y);
			}
		});
	}

	init() {
		this.findWidthHeight(this.nestedArr);
		this.can.width = this.width;
		this.can.height = this.height;
		this.fillCanvas(this.nestedArr);
	}

	draw(ctx, x, y) {
		ctx.drawImage(this.can, x, y, this.width, this.height);
	}

	drawAt(ctx, vec) {
		this.draw(ctx, vec.pixelX, vec.pixelY);
	}
}