How to get 2nd click event on same element

Question

HI,
 I have done on getting the position value of 1st click on Image here as given code:
<Image Name="imgBackground" HorizontalAlignment="Center" VerticalAlignment="Center" Height="799" Width="799" MouseLeftButtonDown="imgBackground_MouseLeftButtonDown" Stretch="Uniform">
</Image>
OpenFileDialog op = new OpenFileDialog();
ImageBrush ib = new ImageBrush();
private void Image_MouseLeftButtonDown_1(object sender, MouseButtonEventArgs e)
op.Title = "Select a picture";
op.Filter = "All supported graphics|*.jpg;*.jpeg;*.png|" +
"JPEG (*.jpg;*.jpeg)|*.jpg;*.jpeg|" +
"Portable Network Graphic (*.png)|*.png";
if (op.ShowDialog() == true)
imgBackground.Source = new BitmapImage(new Uri(op.FileName));
private BitmapSource CutImage(BitmapImage img, Point p1, int width, int height)
return new CroppedBitmap(img, new Int32Rect(Convert.ToInt32(p1.X), Convert.ToInt32(p1.Y), width, height));
double xAxis = 0.00;
double yAxis = 0.00;
private void imgBackground_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
Point center = e.GetPosition(imgBackground);
xAxis = center.X;
yAxis = center.Y;
ib.ImageSource = CutImage(new BitmapImage(new Uri(op.FileName)), new Point(xAxis, yAxis), 200, 200);
CanvasPanel.Background = ib;
As in above code, I'm getting center point of that image.
 I want to get one more point on same image and need to calculate distance between two points(1st clicked point and 2nd clicked point)
Suggest me the way to get that.
Regards,
Viswa

Answer 1

I would store the co-ordinates as you click in  a private point variable.
Call that B.
Plus the last point in another A.
as you click, swop B to A and pick up the current, save to B.
And this function seems to do the distance calculation:
public double GetDistanceBetweenPoints(Point p, Point q)
double a = p.X - q.X;
double b = p.Y - q.Y;
double distance = Math.Sqrt(a * a + b * b);
return distance;
http://www.csharpdeveloping.net/Snippet/How_to_get_distance_between_two_points
Hand it A and B.
I would have though what you have called center is just the position the click is.
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