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microsoft.public.dotnet.framework.drawing

Re: Interacting with a complex image

Frank Hileman

1/18/2005 9:21:00 PM

The best solution is a retained mode graphics system that supports mouse
events and animation. You can create your own, if you wish, using graphics
paths, then compute the shapes by hand using circles, arcs, and pies. I
expect you need to measure the dimensions of the image.

Here is a quickly made animated example of your picture created with VG.net.
Extract all files in the zip to run the exe. The source code is included.
http://www.vg.../support_files...

To build you only need the runtime dll, but to edit the figure in Visual
Studio .NET you need to download the designer at the address below.

Regards,
Frank Hileman

check out VG.net: http://www.vg...
Animated vector graphics system
Integrated Visual Studio .NET graphics editor

"Scott McChesney" <scott.mcchesneyNOSPAM@us.army.mil> wrote in message
news:%23eagwHX$EHA.1408@TK2MSFTNGP10.phx.gbl...
> Folks -
>
> I've been given a project to work with, and I'm having a problem figuring
> out how to tackle it.
>
> I am working with the attached image, which is a chart that has to be
> filled
> in with values in specific locations. Those locations are "everywhere" -
> data, or captions to data, will have to be drawin into basically every
> section except in-between the two outermost concentric circles. Normally,
> this wouldn't be a big problem, except that this image has to be
> interactive. When a user moves the mouse over a piece of data, I'm
> expected
> to highlight it and provide some more information. In order to provide
> some
> context, I have to highlight the associated captions as well.
>
> Based on that criteria, I think it will be easier to manage drawing the
> captions myself, which means I am likely going to be drawing this entire
> chart by hand - so much drawing will have to be done within this chart
> that
> the time I save not drawing this layout is probably not worth it. Also,
> as
> you can probably see, this JPG is not the cleanest image - it's a scan,
> and
> in the time it takes to clean it up (which I will have to do, since this
> image needs to be printable), I can probably write the code to re-produce
> it. Another complication is that one set of captions follows the curve of
> one of the circles.
>
> I believe that the only way I'm going to get anywhere is to define regions
> to manage all the particular "hot spots" on this chart. Once I have
> those,
> my mouse routines are fairly simple, and I can tackle curved printing.
> The
> problem is that some of these regions are fairly non-standard shapes, and
> I
> am having a hard time figuring out the best way to build them. I have
> circles and ellipses (which are the easy part), but I also have pie
> sections
> (with the points cut off and circlar sections cut out), curved rectangles,
> curved rectangles with portions of the edges cut out by ellipses, and pie
> sections that don't start from the center of the circle, but need to
> follow
> the circle's curve.
>
> I know there are routines out there that will find the boundary of a shape
> given an arbitrary starting point within the shape. But once I have the
> boundaries, how do I turn them into a GraphicsPath that I can then turn
> into
> a region?
>
> Am I not seeing something obvious here? Any help would be appreciated.
>
> TIA
>
> - Scott
>
>
>
>