This function is used to get the distance within which you have to touch/click the screen and move with two fingers before you trigger a Pinch Gesture. The distance is measured in inches and has a default value of 0.1.
gesture_get_pinch_distance();
Real (inches)
if (gesture_get_pinch_distance() != 0.1)
{
gesture_pinch_distance(0.1);
}
The above code checks to see if the pinch distance for gestures is set to 0.1 inches and if it is not it sets it to that value.