int
SDL_SendTouchMotion(SDL_TouchID id, SDL_FingerID fingerid,
float x, float y, float pressure)
{
SDL_Touch *touch;
SDL_Finger *finger;
int posted;
float xrel, yrel, prel;
touch = SDL_GetTouch(id);
if (!touch) {
return -1;
}
finger = SDL_GetFinger(touch,fingerid);
if (!finger) {
return SDL_SendTouch(id, fingerid, SDL_TRUE, x, y, pressure);
}
xrel = x - finger->x;
yrel = y - finger->y;
prel = pressure - finger->pressure;
/* Drop events that don't change state */
if (!xrel && !yrel && !prel) {
#if 0
printf("Touch event didn't change state - dropped!\n");
#endif
return 0;
}
/* Update internal touch coordinates */
finger->x = x;
finger->y = y;
finger->pressure = pressure;
/* Post the event, if desired */
posted = 0;
if (SDL_GetEventState(SDL_FINGERMOTION) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERMOTION;
event.tfinger.touchId = id;
event.tfinger.fingerId = fingerid;
event.tfinger.x = x;
event.tfinger.y = y;
event.tfinger.dx = xrel;
event.tfinger.dy = yrel;
event.tfinger.pressure = pressure;
posted = (SDL_PushEvent(&event) > 0);
}
return posted;
}
int
SDL_DelFinger(SDL_Touch* touch,SDL_FingerID fingerid)
{
int index = SDL_GetFingerIndexId(touch,fingerid);
SDL_Finger* finger = SDL_GetFinger(touch,fingerid);
if (!finger) {
return -1;
}
SDL_free(finger);
touch->num_fingers--;
touch->fingers[index] = touch->fingers[touch->num_fingers];
return 0;
}
int
SDL_SendTouch(SDL_TouchID id, SDL_FingerID fingerid,
SDL_bool down, float x, float y, float pressure)
{
int posted;
SDL_Finger *finger;
SDL_Touch* touch = SDL_GetTouch(id);
if (!touch) {
return -1;
}
finger = SDL_GetFinger(touch, fingerid);
if (down) {
if (finger) {
/* This finger is already down */
return 0;
}
if (SDL_AddFinger(touch, fingerid, x, y, pressure) < 0) {
return 0;
}
posted = 0;
if (SDL_GetEventState(SDL_FINGERDOWN) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERDOWN;
event.tfinger.touchId = id;
event.tfinger.fingerId = fingerid;
event.tfinger.x = x;
event.tfinger.y = y;
event.tfinger.dx = 0;
event.tfinger.dy = 0;
event.tfinger.pressure = pressure;
posted = (SDL_PushEvent(&event) > 0);
}
} else {
if (!finger) {
/* This finger is already up */
return 0;
}
posted = 0;
if (SDL_GetEventState(SDL_FINGERUP) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERUP;
event.tfinger.touchId = id;
event.tfinger.fingerId = fingerid;
/* I don't trust the coordinates passed on fingerUp */
event.tfinger.x = finger->x;
event.tfinger.y = finger->y;
event.tfinger.dx = 0;
event.tfinger.dy = 0;
event.tfinger.pressure = pressure;
posted = (SDL_PushEvent(&event) > 0);
}
SDL_DelFinger(touch, fingerid);
}
return posted;
}
int
SDL_SendTouchMotion(SDL_TouchID id, SDL_FingerID fingerid, int relative,
float xin, float yin, float pressurein)
{
SDL_Touch *touch;
SDL_Finger *finger;
int posted;
Sint16 xrel, yrel;
Uint16 x;
Uint16 y;
Uint16 pressure;
touch = SDL_GetTouch(id);
if (!touch) {
return SDL_TouchNotFoundError(id);
}
//scale to Integer coordinates
x = (Uint16)((xin+touch->x_min)*(touch->xres)/(touch->native_xres));
y = (Uint16)((yin+touch->y_min)*(touch->yres)/(touch->native_yres));
pressure = (Uint16)((pressurein+touch->pressure_min)*(touch->pressureres)/(touch->native_pressureres));
if(touch->flush_motion) {
return 0;
}
finger = SDL_GetFinger(touch,fingerid);
if(finger == NULL || !finger->down) {
return SDL_SendFingerDown(id,fingerid,SDL_TRUE,xin,yin,pressurein);
} else {
/* the relative motion is calculated regarding the last position */
if (relative) {
xrel = x;
yrel = y;
x = (finger->last_x + x);
y = (finger->last_y + y);
} else {
if(xin < touch->x_min) x = finger->last_x; /*If movement is only in one axis,*/
if(yin < touch->y_min) y = finger->last_y; /*The other is marked as -1*/
if(pressurein < touch->pressure_min) pressure = finger->last_pressure;
xrel = x - finger->last_x;
yrel = y - finger->last_y;
//printf("xrel,yrel (%i,%i)\n",(int)xrel,(int)yrel);
}
/* Drop events that don't change state */
if (!xrel && !yrel) {
#if 0
printf("Touch event didn't change state - dropped!\n");
#endif
return 0;
}
/* Update internal touch coordinates */
finger->x = x;
finger->y = y;
/*Should scale to window? Normalize? Maintain Aspect?*/
//SDL_GetWindowSize(touch->focus, &x_max, &y_max);
/* make sure that the pointers find themselves inside the windows */
/* only check if touch->xmax is set ! */
/*
if (x_max && touch->x > x_max) {
touch->x = x_max;
} else if (touch->x < 0) {
touch->x = 0;
}
if (y_max && touch->y > y_max) {
touch->y = y_max;
} else if (touch->y < 0) {
touch->y = 0;
}
*/
finger->xdelta = xrel;
finger->ydelta = yrel;
finger->pressure = pressure;
/* Post the event, if desired */
posted = 0;
if (SDL_GetEventState(SDL_FINGERMOTION) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERMOTION;
event.tfinger.touchId = id;
event.tfinger.fingerId = fingerid;
event.tfinger.x = x;
event.tfinger.y = y;
event.tfinger.dx = xrel;
event.tfinger.dy = yrel;
event.tfinger.pressure = pressure;
event.tfinger.state = touch->buttonstate;
event.tfinger.windowID = touch->focus ? touch->focus->id : 0;
posted = (SDL_PushEvent(&event) > 0);
}
finger->last_x = finger->x;
finger->last_y = finger->y;
finger->last_pressure = finger->pressure;
return posted;
}
}
int
SDL_SendFingerDown(SDL_TouchID id, SDL_FingerID fingerid, SDL_bool down,
float xin, float yin, float pressurein)
{
int posted;
Uint16 x;
Uint16 y;
Uint16 pressure;
SDL_Finger *finger;
SDL_Touch* touch = SDL_GetTouch(id);
if(!touch) {
return SDL_TouchNotFoundError(id);
}
//scale to Integer coordinates
x = (Uint16)((xin+touch->x_min)*(touch->xres)/(touch->native_xres));
y = (Uint16)((yin+touch->y_min)*(touch->yres)/(touch->native_yres));
pressure = (Uint16)((pressurein+touch->pressure_min)*(touch->pressureres)/(touch->native_pressureres));
finger = SDL_GetFinger(touch,fingerid);
if(down) {
if(finger == NULL) {
SDL_Finger nf;
nf.id = fingerid;
nf.x = x;
nf.y = y;
nf.pressure = pressure;
nf.xdelta = 0;
nf.ydelta = 0;
nf.last_x = x;
nf.last_y = y;
nf.last_pressure = pressure;
nf.down = SDL_FALSE;
if(SDL_AddFinger(touch,&nf) < 0) return 0;
finger = SDL_GetFinger(touch,fingerid);
}
else if(finger->down) return 0;
if(xin < touch->x_min || yin < touch->y_min) return 0; //should defer if only a partial input
posted = 0;
if (SDL_GetEventState(SDL_FINGERDOWN) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERDOWN;
event.tfinger.touchId = id;
event.tfinger.x = x;
event.tfinger.y = y;
event.tfinger.dx = 0;
event.tfinger.dy = 0;
event.tfinger.pressure = pressure;
event.tfinger.state = touch->buttonstate;
event.tfinger.windowID = touch->focus ? touch->focus->id : 0;
event.tfinger.fingerId = fingerid;
posted = (SDL_PushEvent(&event) > 0);
}
if(posted) finger->down = SDL_TRUE;
return posted;
}
else {
if(finger == NULL) {
SDL_SetError("Finger not found.");
return 0;
}
posted = 0;
if (SDL_GetEventState(SDL_FINGERUP) == SDL_ENABLE) {
SDL_Event event;
event.tfinger.type = SDL_FINGERUP;
event.tfinger.touchId = id;
event.tfinger.state = touch->buttonstate;
event.tfinger.windowID = touch->focus ? touch->focus->id : 0;
event.tfinger.fingerId = fingerid;
//I don't trust the coordinates passed on fingerUp
event.tfinger.x = finger->x;
event.tfinger.y = finger->y;
event.tfinger.dx = 0;
event.tfinger.dy = 0;
event.tfinger.pressure = pressure;
if(SDL_DelFinger(touch,fingerid) < 0) return 0;
posted = (SDL_PushEvent(&event) > 0);
}
return posted;
}
}
