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Updated touch API

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* Normalized touch coordinates as floats in the 0...1 range
* Removed unused touchpad concepts from the API
* Added API functions to get active touch devices and current finger state
This commit is contained in:
Sam Lantinga 2013-03-03 01:01:33 -08:00
parent 71ea3033fa
commit bb0752e573
15 changed files with 356 additions and 917 deletions
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59
include/SDL_touch.h
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@ -46,46 +46,11 @@ typedef Sint64 SDL_FingerID;
typedef struct SDL_Finger
{
SDL_FingerID id;
Uint16 x;
Uint16 y;
Uint16 pressure;
Uint16 xdelta;
Uint16 ydelta;
Uint16 last_x, last_y,last_pressure; /* the last reported coordinates */
SDL_bool down;
float x;
float y;
float pressure;
} SDL_Finger;
typedef struct SDL_Touch
{
/* Free the touch when it's time */
void (*FreeTouch) (struct SDL_Touch * touch);
/* data common for tablets */
float pressure_max, pressure_min;
float x_max,x_min;
float y_max,y_min;
Uint16 xres,yres,pressureres;
float native_xres,native_yres,native_pressureres;
float tilt_x; /* for future use */
float tilt_y; /* for future use */
float rotation; /* for future use */
/* Data common to all touch */
SDL_TouchID id;
SDL_Window *focus;
char *name;
Uint8 buttonstate;
SDL_bool relative_mode;
SDL_bool flush_motion;
int num_fingers;
int max_fingers;
SDL_Finger** fingers;
void *driverdata;
} SDL_Touch;
/* Used as the device ID for mouse events simulated with touch input */
#define SDL_TOUCH_MOUSEID ((Uint32)-1)
@ -93,14 +58,24 @@ typedef struct SDL_Touch
/* Function prototypes */
/**
* \brief Get the touch object with the given id.
* \brief Get the number of registered touch devices.
*/
extern DECLSPEC SDL_Touch* SDLCALL SDL_GetTouch(SDL_TouchID id);
extern DECLSPEC int SDLCALL SDL_GetNumTouchDevices();
/**
* \brief Get the finger object of the given touch, with the given id.
* \brief Get the touch ID with the given index, or 0 if the index is invalid.
*/
extern DECLSPEC SDL_Finger* SDLCALL SDL_GetFinger(SDL_Touch *touch, SDL_FingerID id);
extern DECLSPEC SDL_TouchID SDLCALL SDL_GetTouchDevice(int index);
/**
* \brief Get the number of active fingers for a given touch device.
*/
extern DECLSPEC int SDLCALL SDL_GetNumTouchFingers(SDL_TouchID touchID);
/**
* \brief Get the finger object of the given touch, with the given index.
*/
extern DECLSPEC SDL_Finger * SDLCALL SDL_GetTouchFinger(SDL_TouchID touchID, int index);
/* Ends C function definitions when using C++ */
#ifdef __cplusplus