Function libeyelink_sys::eyelink_driftcorr_startf

pub unsafe extern "C" fn eyelink_driftcorr_startf(x: f32, y: f32) -> INT16

@ingroup setup_eyelink Sets the position of the drift correction target, and switches the tracker to drift-correction mode. Should be followed by a call to \c eyelink_wait_for_mode_ready(). Same as eyelink_driftcorr_start() except the x,y parameters take floating point values.

@param x X position of the target. @param y Y position of the target. @return \c 0 if command sent OK, else link error.

\b Example:

\code

#include 

unsigned key;
int result = 0;
int x, y; // position of the drift correction target

if(eyelink_is_connected())
{
eyecmd_printf("heuristic_filter = ON");
...
while(getkey()) {};  // dump the keys

eyelink_driftcorr_start(x, y); // start the drift correction
do {
result = eyelink_cal_result();

key = getkey();
switch(key)
{
case TERMINATE_KEY:  // breakout code
return TERMINATE_KEY;
case 0: 		// no key
case JUNK_KEY: 	// no key
break;
case ESC_KEY:       // ESC key: we flag abort from our end
result = 27;
break;
case 32: 		// Spacebar: we trigger ourselves
eyelink_accept_trigger();
break;
default:
eyelink_send_keybutton(key,0,KB_PRESS);
break;
}
} while(result == NO_REPLY);

if (result != 27 && result != -1)
eyelink_apply_driftcorr();
else
; // Other code for handling

return result;
}
\endcode

\sa \c eyelink_accept_trigger() and \c eyelink_send_keybutton()