An extensible and nested gesture for drawing tools

This work introduces a two-finger gesture for invoking drawing tools on the fly while a user works on a touch app. The new gesture helps eliminate the need for using any command sequence from the application or the keyboard. The proposed gesture is programmable and can be associated with any type of tool, for example, the drawing brush or the eraser. The new gesture also has functionality for controlling and manipulating properties of the invoked tool. As a result, besides invoking the Brush tool or the Eraser tool, the new gesture provides additional control to the user to modify the size of the Brush tool or the Eraser tool on the fly. All this is done in a seamless manner and does not require the user to leave the drawing canvas.