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 How can I print out the colormap used?		  New Topic  Reply to Topic
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mtav

4 Posts
Posted - 05/28/2020 :  5:22:22 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Hi,

I want to print out the colormap used in a surface plot, so I can reuse exactly the same in other plotting programs.

How can I do this, aside from manually copying over every range and color value from the Plot details->colormap dialog (where I cannot actually even access the color value)?

Or is there a way to make sense of the exported XML .oth colormap?

It doesn't have to be in LabTalk, but that seems to have worked better than the python module so far.
I am happy with any solution for this.

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cpyang

USA
1406 Posts
Posted - 05/28/2020 :  7:50:24 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You can save it to an XML file, like 

string str1="%Ytest.xml";
layer.cmap.save(str1$);


and to apply

string str1="%Ytest.xml";
layer.cmap.load(str1$);


See

https://www.originlab.com/doc/LabTalk/ref/Layer-CMap-obj

CP
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mtav

4 Posts
Posted - 05/29/2020 :  05:19:04 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Mmh, but that is the same as exporting/saving the colormap via the GUI.
I could not find an easy way to read the values from the XML file.
Converting the base64 entries just gave me some other cryptic text (or binary?).
Is the colormap XML format documented anywhere?

I want the levels and RGB values in a format I can use in Matlab, python, pgfplot, etc, i.e. I want it in a text format for example.

I noticed I can get the colors in the "origin internal color code" via:
layer.cmap.colorN

And find out what the "origin internal color code" is via the color() function.

Is there a function converting the internal code to RGB or hex?

Now I just somehow need to combine these things with a loop to print out a list of RGB values, but I am not familiar enough with LabTalk yet.
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lkb0221

China
497 Posts
Posted - 05/29/2020 :  10:18:14 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Try this：
https://www.originlab.com/doc/LabTalk/ref/ocolor2rgb-func
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mtav

4 Posts
Posted - 06/01/2020 :  08:51:46 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks. That is very useful!

Would you happen to know how to use numbers to generate a string to call the appropriate function/macro?

i.e. how can I do something like this:
loop (num, 0, 60)
      {
         OCOLOR = $("layer.cmap.color" + $(num)); // should call layer.cmap.color0 to layer.cmap.color60
         RGB = ocolor2rgb(OCOLOR);
         type "$(num); $(OCOLOR); $(RGB)";
      }



Edited by - mtav on 06/01/2020 08:52:41 AM
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lkb0221

China
497 Posts
Posted - 06/01/2020 :  09:52:54 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
You can directly use:

loop (num, 0, 60) {
    int OCOLOR = layer.cmap.color$(num);
    int RGB = ocolor2rgb(OCOLOR);
    type "$(num); $(OCOLOR); $(RGB)";
}
Edited by - lkb0221 on 06/01/2020 09:54:12 AM
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mtav

4 Posts
Posted - 06/01/2020 :  11:32:20 AM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Thanks a lot. I solved my problem now.

Origin LabTalk script to save the colormap to a CSV file:
type -gbe "origin_colormap.csv";
loop (num, 0, layer.cmap.numColors) {
    int OCOLOR = layer.cmap.color$(num);
    int RGB = ocolor2rgb(OCOLOR);
    type "$(num); $(OCOLOR); $(RGB)";
}
type -ge;

The CSV file will be saved in the current project folder (Help->Open folder->Current project).

Matlab script to load the colormap:
m = load('origin_colormap.csv');
val = m(:,3);
B = fix(val./65536);
G = fix(mod(val, 65536)./256);
R = fix(mod(val, 256));
map255 = [R,G,B];
mapNormalized = map255./255;
colormap(mapNormalized);




Things left to do, but that I do not need right now:
-export and use level values (I did it manually. They were linear, so easy.)
-add below/above levels
-make it easy to use
Edited by - mtav on 06/01/2020 11:33:21 AM
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