| Superimposed Object Views [message #16860] |
Mon, 23 August 1999 00:00 |
Ben Tupper
Messages: 186
Registered: August 1999
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Senior Member |
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Howdy,
I have recently changed some image analysis code from direct graphics
to object graphics. I am soooo glad I did so.
Here's how it works... As the user moves the cursor across the
displayed image, a companion row/column profile plot is updated , and
lines that extend the cursor crosshairs to the edges of the image are
updated, too. The change to object graphics has greatly simplified
the maintenance of the graphics (there are three images visible, each
with a companion row/column profile of differening scales. What a mess
in direct graphics!)
Here's what bugs me... Suprisingly, there is a noticeable slowdown in
update speed in object graphics when compared to the direct graphics
method.
I suspect that... The decrease in speediness may be a result of the
large number of object contents in each image view being updated. Each
image view contains the image, the two crosshair lines, and four
bordering axes.
I'ld like to solve this by ... Dividing each image view into two
supperimposed views: a static view and a dynamic view. I imagine the
static view would contain the image and bordering axes, while the
dynamic view would contain the cursor crosshair extensions.
So here are my questions...
1. Is it possible to superimpose views (like a static and a dynamic
view) so that each is visible?
2. If it is possible, is it worthwhile? I'm loathe to modify a heap
of code and not see a significant speediness gain.
3. How can I draw one view on top of the other without obliterating
the first-draw view?
Thanks,
Ben Tupper
Bigelow Laboratory for Ocean Science
tupper@seadas.bigelow.org
Pemaquid River Company
pemaquidriver@tidewater.net
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