private void Control_OnMouseMove(object sender, MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed)
{
var pos = e.GetPosition(this);
if (_lastMovePosition == new Point())
{
_lastMovePosition = pos;
}
var d = pos.Y - _lastMovePosition.Y;
_lastMovePosition = pos;
var r = ViewportModelRect;
var y = VerticalAxis.ClientToModel(VerticalAxis.ModelToClient(r.Y) - d);
if (VerticalAxis is Log10Axis)
{
r.Height *= y / r.Y;
}
r.Y = y;
if (!double.IsNaN(r.X) && !double.IsNaN(r.Y) && !double.IsNaN(r.Width) && !double.IsNaN(r.Height))
{
ViewportModelRect = r;
}
}
else
{
_lastMovePosition = new Point();
}
}
