/// <summary>
/// Set cursor and resize new polyline
/// </summary>
public override void OnMouseMove(DrawingCanvas drawingCanvas, Point position, MouseButtonState leftButton, MouseButtonState rightButton)
{
drawingCanvas.Cursor = ToolCursor;
if (leftButton != MouseButtonState.Pressed)
{
return;
}
if (!drawingCanvas.IsMouseCaptured)
{
return;
}
if (newPolyLine == null)
{
return; // precaution
}
double distance = (position.X - lastX) * (position.X - lastX) + (position.Y - lastY) * (position.Y - lastY);
double d = drawingCanvas.ActualScale <= 0 ?
minDistance * minDistance :
minDistance * minDistance / drawingCanvas.ActualScale;
if (distance < d)
{
// Distance between last two points is less than minimum -
// move last point
newPolyLine.MoveHandle(position, newPolyLine.HandleCount);
}
else
{
// Add new segment
newPolyLine.AddPoint(position);
lastX = position.X;
lastY = position.Y;
}
}
