[vtkusers] vtkImageItem expected behavior?

[Marcus D. Hanwell]

Hi Eric,

I had meant to clean that class up a little. I was using it to test new
functionality, but then became so focused on getting all the necessary
features into the charts I had not looked at it. I will take a look at the
class today - it was intended to be a generic item where you could add
images to a scene, but was also heavily used when prototyping new API.

Thanks for reminding me about this, and thanks for all the feedback.

Marcus

On Fri, Apr 2, 2010 at 9:31 AM, Eric E. Monson <emonson at cs.duke.edu> wrote:

> Okay, I see now that I've looked at the source code that this is doing
> exactly what it was written to do. It's more of an example class for how to
> include images in a ContextScene.
>
> It might be nice to comment out the DrawPoly() call on line 96 of
> vtkImageItem.cxx so people can see it as an example, but it won't draw that
> squiggle in the Scene if people want to actually use this class to draw an
> image.
>
> Thanks,
> -Eric
>
>
> On Apr 1, 2010, at 11:59 AM, Eric E. Monson wrote:
>
> > Hey all,
> >
> > I need to superimpose a couple images over an XY plot using the new
> Charts, so I was trying out the vtkImageItem. I guess I expected the "item"
> to contain the image and control the size, but it seems be a rectangle that
> acts as an anchor for the lower-left corner of the image. Is this what the
> vtkImageItem is intended to be? (When the documentation says "Set the
> dimensions of the item" in SetDimensions(), it sounds more like this would
> set the image dimensions, not the dimensions of an anchor point.)
> >
> > The color of the image item rectangle changes when I hover over it
> (pink), but it changes to a different color (bright green) when I hover over
> any points on the ChartXY... Is it supposed to be reacting to this other
> (seemingly unrelated) hover event?
> >
> > Oh, and there's a three-line squiggle that gets drawn under the item's
> rectangle. I'm assuming that's just a bug. (see attached image – I'm trying
> this on today's CVS VTK with OS X 10.6.2 x86_64 Cocoa build.)
> >
> > Could someone clarify for me whether this seems to be behaving as
> intended? It's not a criticism, I think I'm just not imagining correctly
> what this was meant to do.
> >
> > Thanks a lot,
> > -Eric
> >
>
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