var maxX = Math.ceil(minX + this.thumbEl.getWidth() - this.canvasEl.width);
var maxY = Math.ceil(minY + this.thumbEl.getHeight() - this.canvasEl.height);
var maxX = Math.ceil(minX + this.thumbEl.getWidth() - this.canvasEl.width);
var maxY = Math.ceil(minY + this.thumbEl.getHeight() - this.canvasEl.height);