public void UpdatePosition(double deltaT)
{
//Constrain target to (0,0)-(1,1)
Point target2 = new Point(To01(Target.X), To01(Target.Y));
double distance = PointUtil.Distance(target2, Pos);
if (distance < Speed * deltaT)
{
Pos = target2;
}
else
{
// Get the velocity vector
Point velocity = new Point((target2.X - Pos.X), (target2.Y - Pos.Y));
// Normalize the vector
double length = Math.Sqrt(velocity.X * velocity.X + velocity.Y * velocity.Y);
velocity = new Point(velocity.X / length, velocity.Y / length);
// Compute updated position
var newPos = new Point(Pos.X + velocity.X * deltaT, Pos.Y + velocity.Y * deltaT);
Pos = newPos;
}
}
/// <summary>
/// Called when a Mouse Button is released on the parent <see cref="SciChartSurface" />
/// </summary>
/// <param name="e">Arguments detailing the mouse button operation</param>
public override void OnModifierMouseUp(ModifierMouseArgs e)
{
if (!_isDragging)
{
return;
}
base.OnModifierMouseUp(e);
// Translate the mouse point (which is in RootGrid coordiantes) relative to the ModifierSurface
// This accounts for any offset due to left Y-Axis
var ptTrans = GetPointRelativeTo(e.MousePoint, ModifierSurface);
_endPoint = SetReticulePosition(_rectangle, _startPoint, ptTrans, e.IsMaster);
double distanceDragged = PointUtil.Distance(_startPoint, ptTrans);
if (distanceDragged > 10.0)
{
PerformSelection(_startPoint, _endPoint);
e.Handled = true;
}
else
{
SelectedPoints = null;
ParentSurface.InvalidateElement();
}
ClearReticule();
_isDragging = false;
if (e.IsMaster)
{
ModifierSurface.ReleaseMouseCapture();
}
}