on
Two pointers shove event. Two pointers move with distance between pointers and pointers angle remaining inside predefined thresholds.
Parameters
pointers
is the angle in degrees determined by the two pointers involved in gesture
initial
is the mid point of the segment determined by the two pointers initial touch down positions
start
is the mid point of the segment determined by the two pointers previous positions
end
is the mid point of the segment determined by the two pointers current positions