private void canvas_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
if (cbxShapes.SelectedIndex == -1)
{
return;
}
Point p = e.GetPosition(canvas);
DrawableObject obj = (DrawableObject)(cbxShapes.SelectedItem as DrawableObject).Clone();
obj.StartPoint = new Point2D(p.X, p.Y);
obj.EndPoint = new Point2D(p.X, p.Y);
_drawingObject = obj;
_suitableDrawing = GetSuitableDrawing(obj);
if (_suitableDrawing != null)
{
_suitableDrawing.Draw(canvas, obj);
_isDrawing = true;
}
}
private void canvas_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
_drawingObject = null;
_suitableDrawing = null;
_isDrawing = false;
}