Get Position of cursor on panel with scrollbars

Question

I\'ve build a simple program (so far) that has a large panel as the \"WorkArea\" of the program. I draw a grid onto it, have some functionality that snaps my cursor to clos

Answer 1

You need to offset the location by the scroll position:

private void panel1_MouseMove(object sender, MouseEventArgs e)
{
      Point scrolledPoint = new Point( e.X - panel1.AutoScrollPosition.X, 
                                       e.Y - panel1.AutoScrollPosition.Y);

      ..
}

Note that the AutoScrollPosition values are negative..:

The X and Y coordinate values retrieved are negative if the control has scrolled away from its starting position (0,0). When you set this property, you must always assign positive X and Y values to set the scroll position relative to the starting position. For example, if you have a horizontal scroll bar and you set x and y to 200, you move the scroll 200 pixels to the right; if you then set x and y to 100, the scroll appears to jump the left by 100 pixels, because you are setting it 100 pixels away from the starting position. In the first case, AutoScrollPosition returns {-200, 0}; in the second case, it returns {-100,0}.

Answer 2

WinForms:

The method Control.PointToClient lets you convert the mouse position relative to the control itself.

Point point = grid.PointToClient(new Point(e.X, e.Y))

WPF:

Using Mouse.GetPosition you can get the position of the mouse relative to a specific control:

Point position = Mouse.GetPosition(grid);