Method updateBounds

packages/melonjs/src/renderable/text/text.js:381–425

* update the bounding box for this Text, accounting for textAlign and textBaseline. * @param {boolean} [absolute=true] - update in absolute coordinates * @returns {Bounds} this renderable's bounding box

(absolute = true)

	 * @returns {Bounds} this renderable's bounding box
	 */
	updateBounds(absolute = true) {
		if (typeof this.metrics !== "undefined" && this._text.length > 0) {
			const bounds = this.getBounds();
			bounds.clear();

			const w = this.metrics.width;
			const h = this.metrics.height;

			// compute x offset based on textAlign
			let ax = 0;
			switch (this.textAlign) {
				case "right":
					ax = w;
					break;
				case "center":
					ax = w / 2;
					break;
			}

			// compute y offset based on textBaseline
			let ay = 0;
			switch (this.textBaseline) {
				case "middle":
					ay = h / 2;
					break;
				case "ideographic":
				case "alphabetic":
				case "bottom":
					ay = h;
					break;
			}

			bounds.addFrame(-ax, -ay, w - ax, h - ay);

			if (absolute === true) {
				const absPos = this.getAbsolutePosition();
				bounds.centerOn(
					absPos.x + bounds.x + bounds.width / 2,
					absPos.y + bounds.y + bounds.height / 2,
				);
			}
			return bounds;
		}
		return super.updateBounds(absolute);
	}

	/**
	 * measure the given text size in pixels