Proper graphic coordinates

[Guest]

I have a form containing a TreeView control in which I've overriden the
OnResize and WndProc functions and added a PaintEventHandler. One thing I
want to do is use DrawReversibleLine for 'rubberbanding' lines connecting
specific nodes with other controls on the form. DrawReversibleLine expects
the start and end points to be passed as screen, rather than client,
coordinates, so I'm passing the coordinates using PointToScreen( ) as
arguments to the function. Regardless, when I call DrawReversibleLine,
passing it the starting coordinate of the node (a point 3 pixels to the right
of the node and midway between the top and bottom of the node), the start
point of the line ends up being roughly 34 pixels closer to the top of the
screen than it should be. I could cludge it and add 34 to the Y-coordinate
prior to calling PointToScreen( ), but there has to be a better answer; I
just can't come up with it. Is there one?

 

[Bob Powell [MVP]]

I bet you're using the PointToScreen of the form and not the treeview...

--
Bob Powell [MVP]
Visual C#, System.Drawing

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[Guest]

That's it! Thanks! Don't know why I didn't think of it as I'd used
"this.PointToScreen" when it should've been "this.treeView1.PointToScreen".