| T O P I C R E V I E W |
| tedfine |
Posted - Jan 06 2018 : 15:15:29
We have a large bit map. (say, 2000x1000).
Is there any way to test whether a given pixel is actually painted on the screen (or eliminated by re-sampling) when zooming (or ImageEnView1 is resized?)
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| 3 L A T E S T R E P L I E S (Newest First) |
| xequte |
Posted - Jan 07 2018 : 17:38:48
Hi Tom
OK, there is no way to determine which pixels are shown after a resample (which would be even more complex if a resample filter was used).
From what you are describing it sounds like your marquee should be on a text layer, or you should resample the image before adding your marquee.
Nigel
Xequte Software
www.imageen.com
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| tedfine |
Posted - Jan 07 2018 : 11:29:19
Hi, Nigel,
Nope, that's not quite what I'm looking for.
Suppose I have an image that is 2000x1000 that I'm displaying it on the screen in a window that is 500x250. Some of the rows from the bitmap just aren't going to be seen on the screen -- because of resampling that gets done.
It's those rows I want to identify. Why? Because I'm drawing a marque in the bitmap itself before displaying it. Perhaps it's 50x60 and located at 0,0. I want the marque to always be visible, if after resampling (assuming the region is in the visual region.)
Perhaps there's a way to do this with layers?
Tom
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| xequte |
Posted - Jan 07 2018 : 04:39:19
Hi
This might not be what you are looking for, but you can see if a pixel is onscreen by comparing it to VisibleBitmapRect:
https://www.imageen.com/help/TImageEnView.VisibleBitmapRect.html
Nigel
Xequte Software
www.imageen.com |
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