How to rotate objects or pictures on my FP?

[paljacob]

I would like to rotate an image of a boat to illustrate the pitch. altenbach made a VI very close to what i want, but I have a hard time making it eat a jpeg image instead of a generated one.

I have tried to make a knob control to do this, but I guess there is a problem with my emf converter.

I would like to avoid generating 64 images to show +-16deg pitch with a 0.5 resolution.....

Thanks!

Kind regards 

Pål Jacob

[altenbach]

Can you show us your code?

You would just read the jpeg using "read jpeg file", then use unflatten pixmap to make the 2D array. 

[altenbach]

Looks like you need to correctly apply the 8bit colormap.

Here's a quick example:

 

Most likely you want to pad the image so it does not get clipped when rotated. Modify as needed.

Unzip the attached example and image into the same folder, then run the VI (LabVIEW 8.5). 

Message Edited by altenbach on 04-18-2010 11:47 AM

Message Edited by Support on 04-19-2010 09:51 AM

[altenbach]

I just noticed that the original old code has a gigantic memory leak. The image should not be in a shift regsiter!

Here's a corrected version!

[paljacob]

Superb solution altenbach!! This is exactly what I was looking for!

Thanks!

[Meng-Shiang.Lin]

Excellent!! This vi will save me a lot of time.

Thank you so much~

Adam

[BPBP]

Hi Altenbach,

With reference to your attached rotateship vi. The background is black, how do i change it to white? or transparent? because i tried it with a picture of mine which is white, rotating it shows the other uncovered areas as black.

Also,  is it possible to make the image permanent in the code without needing to read the file?

[altenbach]

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@BPBP wrote:

With reference to your attached rotateship vi. The background is black, how do i change it to white?

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Initialize a 2D array of white, keep it in shift registers for the two inner FOR loops, and use "replace array subset" in the inner loop to fill the rest with the rotated image.

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@BPBP wrote:

Also,  is it possible to make the image permanent in the code without needing to read the file?

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• Yes, create an indicator on the "Image data" wire (right-click wire, create indicator),
• run the VI once
• make the indicator a diagram constant (right-click the indicator...change to constant)
• Delete the file IO stuff.

 

[altenbach]

Actually, here's a better method. Since we have a colormap, we need to pick one of the colors from the palette. Easiest is to e.g. grab the color of the pixel at (0,0) as background color if we index out of range.

Modify as needed.

[altenbach]

Quick modification to resize image container to the actual image size and also allow zoom. (LabVIEW 8.0)