Allocate and initialize the pinch gesture structure.
#include "gestures/pinch.h"
gesture_pinch_t* pinch_gesture_alloc(pinch_params_t *params, gesture_callback_f callback, struct gestures_set *set)
A pointer to the pinch gesture parameters.
The function to invoke when the pinch gesture changes state.
A pointer to the gesture set to add this pinch gesture to.
This function allocates a new pinch gesture data structure, initializes it with the specified parameters and callback function, and adds it to the specified gesture set.
A pointer to an initialized pinch gesture.