/// <summary>
/// Stores the point specified by (screenX, screenY) coordinates in the data structure.<br/>
/// Determines the curve it belongs to according to the nearest last point of the curves existing.<br/>
/// </summary>
/// <param name="screenX"></param>
/// <param name="screenY"></param>
/// <param name="time">time in ms</param>
public void AddInput(double screenX, double screenY, double distToWall, long time)
{
// transform screen coordinates
double x;
double y;
adaptCoordinates(screenX, screenY, out x, out y);
// update current position
this.curX = x;
this.curY = y;
this.distToWall = distToWall;
Boolean wasDrawing = this.isDrawing;
this.isDrawing = distToWall < LIMIT_DIST_FOR_DRAWING;
// check if there is a line to continue
if (wasDrawing)
{
Wip w = curves.ElementAt(curves.Count - 1);
if (time - w.time < DELTA_TIME && isPointWithinRange(x, y, w.lastPoint()))
{
completeLine(w, x, y, time);
return;
}
}
// new line
insertNewLine(x, y, time);
}
private void completeLine(Wip w, double x, double y, long time)
{
// TODO: move w at the top of the window if handling drawing several lines at the same time
Point lastPoint = w.lastPoint();
// --- check that this is not the same point as the previous one
if (lastPoint.x == x && lastPoint.y == y)
{
lastPoint.IncreaseSize();
return;
}
// --- check that X coordinate is not a change of direction
if (w.direction == NO_DIRECTION)
{
if (x > lastPoint.x)
{
w.direction = LEFT_TO_RIGHT;
}
else
{
w.direction = RIGHT_TO_LEFT;
}
}
else if ((w.direction == LEFT_TO_RIGHT && x < lastPoint.x) || (w.direction == RIGHT_TO_LEFT && x > lastPoint.x))
{
// if change of direction, begin a new line
insertNewLine(x, y, time);
return;
}
// add the new point ...
// --- if the three last points are aligned: remove the current last point before adding the new one
Point lastBoPoint = w.lastBoPoint();
double coef1 = (double)(y - lastBoPoint.y) / (double)(x - lastBoPoint.x);
double coef2 = (double)(lastPoint.y - lastBoPoint.y) / (double)(lastPoint.x - lastBoPoint.x);
if (Math.Abs(1 - coef1 / coef2) < 0.05)
{
w.line.Remove(lastPoint);
}
Point newPoint = new Point(x, y);
if (w.direction == LEFT_TO_RIGHT || w.direction == NO_DIRECTION)
{
w.line.Add(newPoint);
}
else
{
w.line.Insert(0, newPoint);
}
}