SDL_gesture.c File Reference

#include "SDL_config.h"
#include "SDL_events.h"
#include "SDL_events_c.h"
#include "SDL_gesture_c.h"
#include <memory.h>
#include <string.h>
#include <stdio.h>
#include <math.h>

Go to the source code of this file.

Macros
#define	DOLLARNPOINTS   64
#define	DOLLARSIZE   256
#define	ENABLE_DOLLAR
#define	MAXPATHSIZE   1024
#define	PHI   0.618033989

Functions
static float	bestDollarDifference (SDL_FloatPoint *points, SDL_FloatPoint *templ)
static float	dollarDifference (SDL_FloatPoint *points, SDL_FloatPoint *templ, float ang)
static int	dollarNormalize (const SDL_DollarPath *path, SDL_FloatPoint *points)
static float	dollarRecognize (const SDL_DollarPath *path, int *bestTempl, SDL_GestureTouch *touch)
static int	SaveTemplate (SDL_DollarTemplate *templ, SDL_RWops *src)
static int	SDL_AddDollarGesture (SDL_GestureTouch *inTouch, SDL_FloatPoint *path)
static int	SDL_AddDollarGesture_one (SDL_GestureTouch *inTouch, SDL_FloatPoint *path)
int	SDL_GestureAddTouch (SDL_TouchID touchId)
void	SDL_GestureProcessEvent (SDL_Event *event)
static SDL_GestureTouch *	SDL_GetGestureTouch (SDL_TouchID id)
static unsigned long	SDL_HashDollar (SDL_FloatPoint *points)
int	SDL_LoadDollarTemplates (SDL_TouchID touchId, SDL_RWops *src)
	Load Dollar Gesture templates from a file. More...
int	SDL_RecordGesture (SDL_TouchID touchId)
	Begin Recording a gesture on the specified touch, or all touches (-1) More...
int	SDL_SaveAllDollarTemplates (SDL_RWops *src)
	Save all currently loaded Dollar Gesture templates. More...
int	SDL_SaveDollarTemplate (SDL_GestureID gestureId, SDL_RWops *src)
	Save a currently loaded Dollar Gesture template. More...
static int	SDL_SendDollarRecord (SDL_GestureTouch *touch, SDL_GestureID gestureId)
static int	SDL_SendGestureDollar (SDL_GestureTouch *touch, SDL_GestureID gestureId, float error)
int	SDL_SendGestureMulti (SDL_GestureTouch *touch, float dTheta, float dDist)

Variables
SDL_bool	recordAll
SDL_GestureTouch *	SDL_gestureTouch
int	SDL_numGestureTouches = 0

Macro Definition Documentation

#define DOLLARNPOINTS   64

Definition at line 42 of file SDL_gesture.c.

Referenced by dollarDifference(), dollarNormalize(), dollarRecognize(), SaveTemplate(), SDL_AddDollarGesture_one(), SDL_GestureProcessEvent(), SDL_HashDollar(), and SDL_LoadDollarTemplates().

#define DOLLARSIZE   256

Definition at line 43 of file SDL_gesture.c.

Referenced by dollarNormalize().

#define ENABLE_DOLLAR

Definition at line 45 of file SDL_gesture.c.

#define MAXPATHSIZE   1024

Definition at line 40 of file SDL_gesture.c.

Referenced by SDL_GestureProcessEvent().

#define PHI   0.618033989

Definition at line 47 of file SDL_gesture.c.

Referenced by bestDollarDifference().

Function Documentation

static float bestDollarDifference ( SDL_FloatPoint *  points, SDL_FloatPoint *  templ  )

static

Definition at line 262 of file SDL_gesture.c.

References dollarDifference(), M_PI, PHI, SDL_fabs(), and SDL_min.

Referenced by dollarRecognize().

static float dollarDifference ( SDL_FloatPoint *  points, SDL_FloatPoint *  templ, float  ang  )

static

Definition at line 246 of file SDL_gesture.c.

References DOLLARNPOINTS, i, SDL_cos(), SDL_sin(), and SDL_sqrt().

Referenced by bestDollarDifference().

static int dollarNormalize ( const SDL_DollarPath *  path, SDL_FloatPoint *  points  )

static

Definition at line 301 of file SDL_gesture.c.

References d, DOLLARNPOINTS, DOLLARSIZE, i, SDL_atan2(), SDL_cos(), SDL_sin(), and SDL_sqrt().

Referenced by dollarRecognize(), and SDL_GestureProcessEvent().

static float dollarRecognize ( const SDL_DollarPath *  path, int *  bestTempl, SDL_GestureTouch *  touch  )

static

Definition at line 393 of file SDL_gesture.c.

References bestDollarDifference(), dollarNormalize(), DOLLARNPOINTS, i, and SDL_memset().

Referenced by SDL_GestureProcessEvent().

static int SaveTemplate ( SDL_DollarTemplate *  templ, SDL_RWops *  src  )

static

Definition at line 119 of file SDL_gesture.c.

References DOLLARNPOINTS, NULL, and SDL_RWwrite.

Referenced by SDL_SaveAllDollarTemplates(), and SDL_SaveDollarTemplate().

static int SDL_AddDollarGesture ( SDL_GestureTouch *  inTouch, SDL_FloatPoint *  path  )

static

Definition at line 187 of file SDL_gesture.c.

References i, NULL, SDL_AddDollarGesture_one(), SDL_gestureTouch, and SDL_numGestureTouches.

Referenced by SDL_GestureProcessEvent(), and SDL_LoadDollarTemplates().

static int SDL_AddDollarGesture_one ( SDL_GestureTouch *  inTouch, SDL_FloatPoint *  path  )

static

Definition at line 163 of file SDL_gesture.c.

References DOLLARNPOINTS, SDL_HashDollar(), SDL_memcpy(), SDL_OutOfMemory, and SDL_realloc().

Referenced by SDL_AddDollarGesture().

int SDL_GestureAddTouch

(

SDL_TouchID

touchId

)

Definition at line 412 of file SDL_gesture.c.

References SDL_FALSE, SDL_gestureTouch, SDL_numGestureTouches, SDL_OutOfMemory, and SDL_realloc().

Referenced by SDL_AddTouch().

void SDL_GestureProcessEvent

(

SDL_Event *

event

)

Definition at line 485 of file SDL_gesture.c.

References dollarNormalize(), DOLLARNPOINTS, dollarRecognize(), error, i, MAXPATHSIZE, NULL, recordAll, SDL_AddDollarGesture(), SDL_atan2(), SDL_FALSE, SDL_FINGERDOWN, SDL_FINGERMOTION, SDL_FINGERUP, SDL_gestureTouch, SDL_GetGestureTouch(), SDL_numGestureTouches, SDL_SendDollarRecord(), SDL_SendGestureDollar(), SDL_SendGestureMulti(), SDL_sqrt(), SDL_Event::tfinger, SDL_TouchFingerEvent::touchId, and SDL_Event::type.

Referenced by SDL_PushEvent().

static SDL_GestureTouch* SDL_GetGestureTouch ( SDL_TouchID  id )

static

Definition at line 435 of file SDL_gesture.c.

References i, NULL, SDL_gestureTouch, and SDL_numGestureTouches.

Referenced by SDL_GestureProcessEvent().

static unsigned long SDL_HashDollar ( SDL_FloatPoint *  points )

static

Definition at line 107 of file SDL_gesture.c.

References DOLLARNPOINTS, and i.

Referenced by SDL_AddDollarGesture_one().

int SDL_LoadDollarTemplates	(	SDL_TouchID	touchId,
		SDL_RWops *	src
	)

Load Dollar Gesture templates from a file.

Definition at line 207 of file SDL_gesture.c.

References DOLLARNPOINTS, i, NULL, SDL_AddDollarGesture(), SDL_gestureTouch, SDL_numGestureTouches, and SDL_RWread.

int SDL_RecordGesture

(

SDL_TouchID

touchId

)

Begin Recording a gesture on the specified touch, or all touches (-1)

Definition at line 93 of file SDL_gesture.c.

References i, recordAll, SDL_gestureTouch, SDL_numGestureTouches, and SDL_TRUE.

int SDL_SaveAllDollarTemplates

(

SDL_RWops *

src

)

Save all currently loaded Dollar Gesture templates.

Definition at line 135 of file SDL_gesture.c.

References i, j, SaveTemplate(), SDL_gestureTouch, and SDL_numGestureTouches.

int SDL_SaveDollarTemplate	(	SDL_GestureID	gestureId,
		SDL_RWops *	src
	)

Save a currently loaded Dollar Gesture template.

Definition at line 147 of file SDL_gesture.c.

References i, j, SaveTemplate(), SDL_gestureTouch, SDL_numGestureTouches, and SDL_SetError().

static int SDL_SendDollarRecord ( SDL_GestureTouch *  touch, SDL_GestureID  gestureId  )

static

Definition at line 475 of file SDL_gesture.c.

References SDL_DOLLARRECORD, and SDL_PushEvent().

Referenced by SDL_GestureProcessEvent().

static int SDL_SendGestureDollar ( SDL_GestureTouch *  touch, SDL_GestureID  gestureId, float  error  )

static

Definition at line 459 of file SDL_gesture.c.

References error, SDL_DOLLARGESTURE, and SDL_PushEvent().

Referenced by SDL_GestureProcessEvent().

int SDL_SendGestureMulti	(	SDL_GestureTouch *	touch,
		float	dTheta,
		float	dDist
	)

Definition at line 446 of file SDL_gesture.c.

References SDL_MULTIGESTURE, and SDL_PushEvent().

Referenced by SDL_GestureProcessEvent().

Variable Documentation

SDL_bool recordAll

Definition at line 79 of file SDL_gesture.c.

Referenced by SDL_GestureProcessEvent(), and SDL_RecordGesture().

SDL_GestureTouch* SDL_gestureTouch

Definition at line 77 of file SDL_gesture.c.

Referenced by SDL_AddDollarGesture(), SDL_GestureAddTouch(), SDL_GestureProcessEvent(), SDL_GetGestureTouch(), SDL_LoadDollarTemplates(), SDL_RecordGesture(), SDL_SaveAllDollarTemplates(), and SDL_SaveDollarTemplate().

int SDL_numGestureTouches = 0

Definition at line 78 of file SDL_gesture.c.

Referenced by SDL_AddDollarGesture(), SDL_GestureAddTouch(), SDL_GestureProcessEvent(), SDL_GetGestureTouch(), SDL_LoadDollarTemplates(), SDL_RecordGesture(), SDL_SaveAllDollarTemplates(), and SDL_SaveDollarTemplate().