//This method is run when the scrollStepTime raises an elapsed event. The method checks if the latest gaze coordinate from the user is out side the
// deadZoneRect, if the coordinates are outside this zone the value is then passed to the calculate scroll speed method which returns and integer value of how
// many mouse wheel clicks to scroll.
private void scroll(object O, ElapsedEventArgs e)
{
int xScrollValue = 0;
int yScrollValue = 0;
//check if users gaze on X axis is greater the right bound deadZoneRect
if (currentGazeLocationX > deadZoneRect.RightBound)
{
//Calculate how much to scroll
xScrollValue = calculateScrollSpeed(currentGazeLocationX, deadZoneRect.RightBound, ValueNeverChange.SCREEN_SIZE.Width, ScrollScalarValue, false);
}
//check if users gaze on X axis is less than left bound of deadZoneRect
if (currentGazeLocationX < deadZoneRect.LeftBound)
{
xScrollValue = calculateScrollSpeed(currentGazeLocationX, 0, deadZoneRect.LeftBound, ScrollScalarValue, true);
}
if (currentGazeLocationY > deadZoneRect.BottomBound)
{
yScrollValue = calculateScrollSpeed(currentGazeLocationY, deadZoneRect.BottomBound, ValueNeverChange.SCREEN_SIZE.Height, ScrollScalarValue, false);
}
if (currentGazeLocationY < deadZoneRect.TopBound)
{
yScrollValue = calculateScrollSpeed(currentGazeLocationY, 0, deadZoneRect.TopBound, ScrollScalarValue, true);
}
//only scroll is the value is greater than 0
if (Math.Abs(xScrollValue) > 0 || Math.Abs(yScrollValue) > 0)
{ //pass amount to scroll in respective direction
VirtualMouse.Scroll(yScrollValue, xScrollValue * -1); // xScrollValue * -1 is used to correct scroll direction on x axis
}
}
//The action state is responsible for completing each action that must take place during each state
public void Action()
{
switch (SystemFlags.currentState)
{
case SystemState.Wait:
scrollWorker.stopScroll();
if (SystemFlags.hasSelectedButtonColourBeenReset == false)
{
toolbar.resetButtonsColor();
SystemFlags.hasSelectedButtonColourBeenReset = true;
}
break;
case SystemState.ActionButtonSelected:
scrollWorker.stopScroll();
if (!SystemFlags.fixationRunning)
{
fixationWorker.StartDetectingFixation();
SystemFlags.fixationRunning = true;
}
if (Program.readSettings.selectionFeedback) //don't show the crosshair if selection feedback is off
{
zoomer.Start();
zoomer.Show();
zoomer.CrossHairPos = fixationWorker.getXY();
}
break;
case SystemState.Zooming:
scrollWorker.stopScroll();
fixationWorker.IsZoomerFixation(true);
if (SystemFlags.shortCutKeyPressed) //if a user defined click key is pressed
{
fixationPoint = shortCutKeyWorker.GetXY();
SystemFlags.shortCutKeyPressed = false;
}
else
{
fixationPoint = fixationWorker.getXY(); //get the location the user looked
}
magnifier.Timer.Enabled = true;
// magnifier.UpdatePosition(fixationPoint);
// Give the magnifier the point on screen to magnify
magnifier.FixationPoint = fixationPoint;
Point p1 = Utils.DividePoint(magnifier.Offset, magnifier.MagnifierDivAmount());
Point p2 = Utils.DividePoint(magnifier.SecondaryOffset, magnifier.MagnifierDivAmount());
Point o = Utils.SubtractPoints(p1, p2);
zoomer.Offset = o; // This initiate's the timer for drawing of the user feedback image
zoomer.Start();
zoomer.Show();
zoomer.CrossHairPos = magnifier.GetLookPosition();
//disable neccesary flags
SystemFlags.hasGaze = false;
SystemFlags.fixationRunning = false;
break;
case SystemState.ZoomWait: //waiting for user to fixate
if (!SystemFlags.fixationRunning)
{
fixationWorker.StartDetectingFixation();
SystemFlags.fixationRunning = true;
}
zoomer.CrossHairPos = magnifier.GetLookPosition();
//SetZoomerOffset();
break;
case SystemState.ApplyAction: //the fixation on the zoom lens has been detected
fixationPoint = fixationWorker.getXY();
//SetZoomerOffset();
fixationPoint.X += zoomer.Offset.X;
fixationPoint.Y += zoomer.Offset.Y;
fixationPoint = magnifier.GetLookPosition();
zoomer.ResetZoomLens(); //hide the lens
// MessageBox.Show(magnifier.SecondaryOffset.X + " " + magnifier.SecondaryOffset.Y);
//Set the magnification factor back to initial value
// This is done so that a "dynamic zoom in" feature can be
// implemented in the future
magnifier.ResetZoomValue();
magnifier.Stop();
//execute the appropriate action
if (SystemFlags.actionToBePerformed == ActionToBePerformed.LeftClick)
{
VirtualMouse.LeftMouseClick(fixationPoint.X, fixationPoint.Y);
}
else if (SystemFlags.actionToBePerformed == ActionToBePerformed.RightClick)
{
VirtualMouse.RightMouseClick(fixationPoint.X, fixationPoint.Y);
}
else if (SystemFlags.actionToBePerformed == ActionToBePerformed.DoubleClick)
{
VirtualMouse.LeftDoubleClick(fixationPoint.X, fixationPoint.Y);
}
else if (SystemFlags.actionToBePerformed == ActionToBePerformed.Scroll)
{
SystemFlags.currentState = SystemState.ScrollWait;
SystemFlags.scrolling = true;
VirtualMouse.SetCursorPos(fixationPoint.X, fixationPoint.Y);
scrollWorker.StartScroll();
}
else if (SystemFlags.actionToBePerformed == ActionToBePerformed.MicInput)
{
if (Program.readSettings.micInput != Constants.KEY_FUNCTION_UNASSIGNED_MESSAGE)
{
if (!micIsOn)
{
VirtualMouse.LeftMouseClick(fixationPoint.X, fixationPoint.Y);
SendKeys.Send(Program.readSettings.micInput);
SystemFlags.hasSelectedButtonColourBeenReset = true;
micIsOn = true;
}
else
{
SendKeys.Send(Program.readSettings.micInputOff);
SystemFlags.hasSelectedButtonColourBeenReset = false;
micIsOn = false;
}
}
}
fixationWorker = new FixationDetection();
break;
}
}
//The action state is responsible for completing each action that must take place during each state
public void Action()
{
switch (SystemFlags.currentState)
{
case SystemState.Wait:
if (SystemFlags.hasSelectedButtonColourBeenReset == false)
{
toolbar.resetButtonsColor();
SystemFlags.hasSelectedButtonColourBeenReset = true;
}
break;
case SystemState.ActionButtonSelected:
scrollWorker.stopScroll();
if (!SystemFlags.fixationRunning)
{
fixationWorker.StartDetectingFixation();
SystemFlags.fixationRunning = true;
}
break;
case SystemState.Zooming:
if (SystemFlags.shortCutKeyPressed) //if a user defined click key is pressed
{
fixationPoint = shortCutKeyWorker.GetXY();
SystemFlags.shortCutKeyPressed = false;
}
else
{
fixationPoint = fixationWorker.getXY(); //get the location the user looked
}
//zoomLens setup
zoomer.determineDesktopLocation(fixationPoint);
//checking if the user looked in a corner
corner = zoomer.checkCorners(fixationPoint);
//Checking if a user looked near an edge
edge = zoomer.checkEdge();
cornerBool = false;
edgeBool = false;
if (corner != Corner.NoCorner) //if the user looked in a corner
{
zoomer.setZoomLensPositionCorner(corner); //set the lens into the corner
cornerBool = true;
}
else if (edge != Edge.NoEdge) //if there is no corner and the user looked near the edge of the screen
{
zoomer.setZoomLensPositionEdge(edge, fixationPoint); //set lens to edge
edgeBool = true;
}
zoomer.TakeScreenShot(); //This is taking the screenshot that will be zoomed in on
zoomer.CreateZoomLens(fixationPoint); //create a zoom lens at this location
//disable neccesary flags
SystemFlags.gaze = false;
SystemFlags.fixationRunning = false;
break;
case SystemState.ZoomWait: //waiting for user to fixate
if (!SystemFlags.fixationRunning)
{
fixationWorker.StartDetectingFixation();
SystemFlags.fixationRunning = true;
}
break;
case SystemState.ApplyAction: //the fixation on the zoom lens has been detected
fixationPoint = fixationWorker.getXY();
zoomer.ResetZoomLens(); //hide the lens
fixationPoint = zoomer.TranslateGazePoint(fixationPoint); //translate the form coordinates to the desktop
//Checking if the user has zoomed in on an edge or a corner and offsetting the zoomed in click calculations to account for the
//different location of the screenshot
//e.g when a corner is selected the program zooms into the corner instead of the middle of the zoomlens, this means that for the final point to be accurate
//there must be an offset to account for the different zoom direction.
if (cornerBool)
{
fixationPoint = zoomer.cornerOffset(corner, fixationPoint);
}
else if (edgeBool)
{
fixationPoint = zoomer.edgeOffset(edge, fixationPoint);
}
if (fixationPoint.X == -1) //check if it's out of bounds
{
EnterWaitState();
}
else
{
//execute the appropriate action
if (SystemFlags.actionToBePerformed == ActionToBePerformed.LeftClick)
{
VirtualMouse.LeftMouseClick(fixationPoint.X, fixationPoint.Y);
}
else if (SystemFlags.actionToBePerformed == ActionToBePerformed.RightClick)
{
VirtualMouse.RightMouseClick(fixationPoint.X, fixationPoint.Y);
}
else if (SystemFlags.actionToBePerformed == ActionToBePerformed.DoubleClick)
{
VirtualMouse.LeftDoubleClick(fixationPoint.X, fixationPoint.Y);
}
else if (SystemFlags.actionToBePerformed == ActionToBePerformed.Scroll)
{
SystemFlags.currentState = SystemState.ScrollWait;
SystemFlags.scrolling = true;
VirtualMouse.SetCursorPos(fixationPoint.X, fixationPoint.Y);
scrollWorker.StartScroll();
}
}
break;
}
}