public Point StayOrExitBox(Point gp)
{
//iterate through all the most recent raw gaze points and check that they all are at least thresholdPixels away
int threshold = ScreenPixelHelper.ConvertMmToPixels(ConfigManager.cursorMagnetClippingExitThresholdMm);
List <Point> rawGazePoints = mc.WarpPointer.GetGazeHistory();
if (rawGazePoints == null || rawGazePoints.Count == 0 || ClippedBox == null)
{
winzoomAvailable = true;
return(gp); //todo: out of bound?
}
int sampleRate = mc.WarpPointer.GetSampleRate();
int recentDurationMs = ConfigManager.cursorMagnetClippingExitDurationMs; //todo: config
int lookbackSampleCount = sampleRate * recentDurationMs / 1000;
int startIndex = Math.Max(0, rawGazePoints.Count - lookbackSampleCount);
//all points have to leave the box by at least exitThreshold amount in order to consider exit
//equivalent to having 1 point not leave the box by exitThreshold to continue staying
for (int i = startIndex; i < rawGazePoints.Count; i++)
{
//use the calibration adjusted value for the raw data
Point adjustedGp = new Point(rawGazePoints[i].X, rawGazePoints[i].Y);
adjustedGp.Offset(calibrationAdjuster.GetCalibrationAdjustment(adjustedGp));
if (isNearBox(adjustedGp, ClippedBox, ScreenPixelHelper.ConvertMmToPixels(ConfigManager.cursorMagnetClippingExitThresholdMm)))
{
//stay in box, since 1 point is still threshold/2 near the perimeter of the currently clipped box
return(ClippedBox.center());
}
}
//We went through the most recent gaze points and all of them are more than threshold away
//Exit this box
ClippedBox = null;
winzoomAvailable = true;
return(gp); //todo: out of bound
}
protected override void OnPaint(PaintEventArgs e)
{
User32.SetFormTransparent(this.Handle);
//Convert the current warp point a point on the screen
Point wp = warpPointer.GetWarpPoint();
wp.Offset(calibrationAdjuster.GetCalibrationAdjustment(wp));
Point screenPoint = wz.ConvertToScreenPoint(wp);
Rectangle screenSize = ScreenPixelHelper.GetScreenSize();
if (ConfigManager.zoomboxGrid)
{
//Draw a vertical line
e.Graphics.DrawLine(Pens.Black, new Point(screenPoint.X, screenSize.Top), new Point(screenPoint.X, screenSize.Bottom));
//Draw a horizontal line
e.Graphics.DrawLine(Pens.Black, new Point(screenSize.Left, screenPoint.Y), new Point(screenSize.Right, screenPoint.Y));
}
else
{
DrawApplicableCursorSymbol(e, screenPoint);
}
}