public void Canvas_OnLeftMouseDown(object sender, MouseEventArgs e)
{
if (isDrawing)
{
//Reset drawing
isDrawing = false;
canvasMain.Children.Remove(previewLine);
}
else
{
isDrawing = true;
Point thePoint = e.GetPosition(sender as IInputElement);
//Create projected line
previewLine = new ProjectedLine();
previewLine.Fill = Brushes.Black;
previewLine.StrokeThickness = 2;
previewLine.Stroke = Brushes.Black;
//Set initial position for the line
previewLine.X1 = canvasMain.ActualWidth / 2;
previewLine.Y1 = canvasMain.ActualHeight / 2;
previewLine.X2 = thePoint.X;
previewLine.Y2 = thePoint.Y;
//Add to canvas
canvasMain.Children.Add(previewLine);
AddMeasurementAdorner(previewLine);
}
}
public MeasurementAdorner(UIElement adornedElement)
: base(adornedElement)
{
_visualChildren = new VisualCollection(this);
_element = (ProjectedLine)adornedElement;
_element.PointChanged += new EventHandler(_element_PointChanged);
_lengthTextBlock = new TextBlock();
_visualChildren.Add(_lengthTextBlock);
}
private void AddMeasurementAdorner(ProjectedLine line)
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(line);
MeasurementAdorner pla = new MeasurementAdorner(line);
adornerLayer.Add(pla);
}