set(textAlign, scale) {
		this.textAlign = textAlign;
		// updated scaled Size
		if (scale) {
			this.resize(scale);
		}
		this.isDirty = true;

		return this;
	}
change the font settings
@param {string} textAlign - ("left", "center", "right")
@param {number} [scale]
@returns {BitmapText} this object for chaining