src/Mouse.js
function begin_gesture(e) {
        var touch = e.touches[0];
        gesture_in_progress = true;
        gesture_start_x = touch.clientX;
        gesture_start_y = touch.clientY;
    }
function begin_gesture(e) {
        var touch = e.touches[0];
        gesture_in_progress = true;
        gesture_start_x = touch.clientX;
        gesture_start_y = touch.clientY;
    }
function begin_gesture ( e ) { var touch = e . touches [ 0 ] ; gesture_in_progress = true ; gesture_start_x = touch . clientX ; gesture_start_y = touch . clientY ; }
Begins a new gesture at the location of the first touch in the given
touch event.

@private
@param {TouchEvent} e The touch event beginning this new gesture.
Begins a new gesture at the location of the first touch in the given touch event .