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/*
* This is an example that demonstrates how to connect to the EyeX Engine and subscribe to the eye position data stream.
*
* Copyright 2013-2014 Tobii Technology AB. All rights reserved.
*/
#include <Windows.h>
#include <stdio.h>
#include <conio.h>
#include <assert.h>
#include "eyex/EyeX.h"
#pragma comment (lib, "Tobii.EyeX.Client.lib")
// ID of the global interactor that provides our data stream; must be unique within the application.
static const TX_STRING InteractorId = "Fluttershy";
// global variables
static TX_HANDLE g_hGlobalInteractorSnapshot = TX_EMPTY_HANDLE;
/*
* Initializes g_hGlobalInteractorSnapshot with an interactor that has the Eye Position behavior.
*/
BOOL InitializeGlobalInteractorSnapshot(TX_CONTEXTHANDLE hContext)
{
TX_HANDLE hInteractor = TX_EMPTY_HANDLE;
TX_HANDLE hBehaviorWithoutParameters = TX_EMPTY_HANDLE;
BOOL success;
success = txCreateGlobalInteractorSnapshot(
hContext,
InteractorId,
&g_hGlobalInteractorSnapshot,
&hInteractor) == TX_RESULT_OK;
success &= txCreateInteractorBehavior(hInteractor, &hBehaviorWithoutParameters, TX_BEHAVIORTYPE_EYEPOSITIONDATA) == TX_RESULT_OK;
txReleaseObject(&hInteractor);
return success;
}
/*
* Callback function invoked when a snapshot has been committed.
*/
void TX_CALLCONVENTION OnSnapshotCommitted(TX_CONSTHANDLE hAsyncData, TX_USERPARAM param)
{
// check the result code using an assertion.
// this will catch validation errors and runtime errors in debug builds. in release builds it won't do anything.
TX_RESULT result = TX_RESULT_UNKNOWN;
txGetAsyncDataResultCode(hAsyncData, &result);
assert(result == TX_RESULT_OK || result == TX_RESULT_CANCELLED);
}
/*
* Callback function invoked when the status of the connection to the EyeX Engine has changed.
*/
void TX_CALLCONVENTION OnEngineConnectionStateChanged(TX_CONNECTIONSTATE connectionState, TX_USERPARAM userParam)
{
switch (connectionState) {
case TX_CONNECTIONSTATE_CONNECTED: {
BOOL success;
printf("The connection state is now CONNECTED (We are connected to the EyeX Engine)\n");
// commit the snapshot with the global interactor as soon as the connection to the engine is established.
// (it cannot be done earlier because committing means "send to the engine".)
success = txCommitSnapshotAsync(g_hGlobalInteractorSnapshot, OnSnapshotCommitted, NULL) == TX_RESULT_OK;
if (!success) {
printf("Failed to initialize the data stream.\n");
}
else {
printf("Waiting for eye position data to start streaming...\n");
}
}
break;
case TX_CONNECTIONSTATE_DISCONNECTED:
printf("The connection state is now DISCONNECTED (We are disconnected from the EyeX Engine)\n");
break;
case TX_CONNECTIONSTATE_TRYINGTOCONNECT:
printf("The connection state is now TRYINGTOCONNECT (We are trying to connect to the EyeX Engine)\n");
break;
case TX_CONNECTIONSTATE_SERVERVERSIONTOOLOW:
printf("The connection state is now SERVER_VERSION_TOO_LOW: this application requires a more recent version of the EyeX Engine to run.\n");
break;
case TX_CONNECTIONSTATE_SERVERVERSIONTOOHIGH:
printf("The connection state is now SERVER_VERSION_TOO_HIGH: this application requires an older version of the EyeX Engine to run.\n");
break;
}
}
/*
* Handles an event from the Eye Position data stream.
*/
void OnEyePositionDataEvent(TX_HANDLE hEyePositionDataBehavior)
{
COORD position = {0,8};
TX_EYEPOSITIONDATAEVENTPARAMS eventParams;
if (txGetEyePositionDataEventParams(hEyePositionDataBehavior, &eventParams) == TX_RESULT_OK) {
SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), position);
// Output information about the left eye.
printf("LEFT EYE\n");
printf("========\n");
printf("3D position: (%.1f, %.1f, %.1f) \n",
eventParams.LeftEyeX, eventParams.LeftEyeY, eventParams.LeftEyeZ);
printf("Normalized : (%.1f, %.1f, %.1f) \n",
eventParams.LeftEyeXNormalized, eventParams.LeftEyeYNormalized, eventParams.LeftEyeZNormalized);
// Output information about the right eye.
printf("\n");
printf("RIGHT EYE\n");
printf("=========\n");
printf("3D position: (%.1f, %.1f, %.1f) \n",
eventParams.RightEyeX, eventParams.RightEyeY, eventParams.RightEyeZ);
printf("Normalized : (%.1f, %.1f, %.1f) \n",
eventParams.RightEyeXNormalized, eventParams.RightEyeYNormalized, eventParams.RightEyeZNormalized);
printf("\n");
printf("The 3D position consists of X,Y,Z coordinates expressed in millimeters \n");
printf("in relation to the center of the screen where the eye tracker is mounted. \n");
printf("\n");
printf("The normalized coordinates are expressed in relation to the track box, \n");
printf("i.e. the volume in which the eye tracker is theoretically able to track eyes. \n");
printf("- (0,0,0) represents the upper, right corner closest to the eye tracker. \n");
printf("- (1,1,1) represents the lower, left corner furthest away from the eye tracker. \n");
} else {
printf("Failed to interpret eye position data event packet.\n");
}
}
/*
* Callback function invoked when an event has been received from the EyeX Engine.
*/
void TX_CALLCONVENTION HandleEvent(TX_CONSTHANDLE hAsyncData, TX_USERPARAM userParam)
{
TX_HANDLE hEvent = TX_EMPTY_HANDLE;
TX_HANDLE hBehavior = TX_EMPTY_HANDLE;
txGetAsyncDataContent(hAsyncData, &hEvent);
// NOTE. Uncomment the following line of code to view the event object. The same function can be used with any interaction object.
//OutputDebugStringA(txDebugObject(hEvent));
if (txGetEventBehavior(hEvent, &hBehavior, TX_BEHAVIORTYPE_EYEPOSITIONDATA) == TX_RESULT_OK) {
OnEyePositionDataEvent(hBehavior);
txReleaseObject(&hBehavior);
}
// NOTE since this is a very simple application with a single interactor and a single data stream,
// our event handling code can be very simple too. A more complex application would typically have to
// check for multiple behaviors and route events based on interactor IDs.
txReleaseObject(&hEvent);
}
/*
* Application entry point.
*/
int main(int argc, char* argv[])
{
TX_CONTEXTHANDLE hContext = TX_EMPTY_HANDLE;
TX_TICKET hConnectionStateChangedTicket = TX_INVALID_TICKET;
TX_TICKET hEventHandlerTicket = TX_INVALID_TICKET;
BOOL success;
// initialize and enable the context that is our link to the EyeX Engine.
success = txInitializeEyeX(TX_EYEXCOMPONENTOVERRIDEFLAG_NONE, NULL, NULL, NULL, NULL) == TX_RESULT_OK;
success &= txCreateContext(&hContext, TX_FALSE) == TX_RESULT_OK;
success &= InitializeGlobalInteractorSnapshot(hContext);
success &= txRegisterConnectionStateChangedHandler(hContext, &hConnectionStateChangedTicket, OnEngineConnectionStateChanged, NULL) == TX_RESULT_OK;
success &= txRegisterEventHandler(hContext, &hEventHandlerTicket, HandleEvent, NULL) == TX_RESULT_OK;
success &= txEnableConnection(hContext) == TX_RESULT_OK;
// let the events flow until a key is pressed.
if (success) {
printf("Initialization was successful.\n");
} else {
printf("Initialization failed.\n");
}
printf("Press any key to exit...\n");
_getch();
printf("Exiting.\n");
// disable and delete the context.
txDisableConnection(hContext);
txReleaseObject(&g_hGlobalInteractorSnapshot);
success = txShutdownContext(hContext, TX_CLEANUPTIMEOUT_DEFAULT, TX_FALSE) == TX_RESULT_OK;
success &= txReleaseContext(&hContext) == TX_RESULT_OK;
success &= txUninitializeEyeX() == TX_RESULT_OK;
if (!success) {
printf("EyeX could not be shut down cleanly. Did you remember to release all handles?\n");
}
return 0;
}
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