The reason for tracking the middle finger is to avoid occlusions that can occur when the thumb and index finger are pressed together. Pen placement and stroke thickness are determined by tracking the tip of the user’s middle finger, which may seem unintuitive considering the finger-pinch is the enabling gesture for drawing on the canvas. This gesture was selected because it approximates the hand pose a user would make when holding a pen or brush. The Sketch app simulates drawing on a canvas when the user makes the " two_fingers_pinch_open" gesture.
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