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#ifndef _SWAY_GESTURE_H
#define _SWAY_GESTURE_H
#include <stdbool.h>
#include <stdint.h>
/**
* A gesture type used in binding.
*/
enum gesture_type {
GESTURE_TYPE_NONE = 0,
GESTURE_TYPE_HOLD,
GESTURE_TYPE_PINCH,
GESTURE_TYPE_SWIPE,
};
// Turns single type enum value to constant string representation.
const char *gesture_type_string(enum gesture_type direction);
// Value to use to accept any finger count
extern const uint8_t GESTURE_FINGERS_ANY;
/**
* A gesture direction used in binding.
*/
enum gesture_direction {
GESTURE_DIRECTION_NONE = 0,
// Directions based on delta x and y
GESTURE_DIRECTION_UP = 1 << 0,
GESTURE_DIRECTION_DOWN = 1 << 1,
GESTURE_DIRECTION_LEFT = 1 << 2,
GESTURE_DIRECTION_RIGHT = 1 << 3,
// Directions based on scale
GESTURE_DIRECTION_INWARD = 1 << 4,
GESTURE_DIRECTION_OUTWARD = 1 << 5,
// Directions based on rotation
GESTURE_DIRECTION_CLOCKWISE = 1 << 6,
GESTURE_DIRECTION_COUNTERCLOCKWISE = 1 << 7,
};
// Turns single direction enum value to constant string representation.
const char *gesture_direction_string(enum gesture_direction direction);
/**
* Struct representing a pointer gesture
*/
struct gesture {
enum gesture_type type;
uint8_t fingers;
uint32_t directions;
};
/**
* Parses gesture from <gesture>[:<fingers>][:<directions>] string.
*
* Return NULL on success, otherwise error message string
*/
char *gesture_parse(const char *input, struct gesture *output);
// Turns gesture into string representation
char *gesture_to_string(struct gesture *gesture);
// Check if gesture is of certain type and finger count.
bool gesture_check(struct gesture *target,
enum gesture_type type, uint8_t fingers);
// Check if a gesture target/binding is match by other gesture/input
bool gesture_match(struct gesture *target,
struct gesture *to_match, bool exact);
// Returns true if gesture are exactly the same
bool gesture_equal(struct gesture *a, struct gesture *b);
// Compare distance between two matched target gestures.
int8_t gesture_compare(struct gesture *a, struct gesture *b);
// Small helper struct to track gestures over time
struct gesture_tracker {
enum gesture_type type;
uint8_t fingers;
double dx, dy;
double scale;
double rotation;
};
// Begin gesture tracking
void gesture_tracker_begin(struct gesture_tracker *tracker,
enum gesture_type type, uint8_t fingers);
// Check if the provides type is currently being tracked
bool gesture_tracker_check(struct gesture_tracker *tracker,
enum gesture_type type);
// Update gesture track with new data point
void gesture_tracker_update(struct gesture_tracker *tracker, double dx,
double dy, double scale, double rotation);
// Reset tracker
void gesture_tracker_cancel(struct gesture_tracker *tracker);
// Reset tracker and return gesture tracked
struct gesture *gesture_tracker_end(struct gesture_tracker *tracker);
#endif
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