HOW COULD I ASSIGN DIFFERENT COLORS TO DIFFERENT VALUES?

Hi,

I have a list of numbers which correspond different lines, as attached. I want assign different colors to the lines wich correspond different values. I can't do it with gradient component, because I have very similar colors for little variation of values, so I can't distinguish lines with different values. I hope Iwas clear!

Attachments:

list.png, 33 KB

Replies to This Discussion

Permalink Reply by David Rutten on July 12, 2016 at 10:57am

You can draw individual lines using individual colours, so the problem becomes assigning different colours to all different numbers.

You could still use a gradient, but instead of mapping the actual value (which would indeed result in two very similar values being drawn using two very similar colours), you can map the indexed value. In other words, first you create a set containing all unique numbers, say {0.0, 0.037, 0.038, 0.32, 0.44, 0.71}, and then you find for each number at what index it occurs. That way 0.0 becomes 0, 0.037 becomes 1, 0.038 becomes 2, 0.32 becomes 3, 0.44 becomes 4 and 0.71 becomes 5. By evaluating a gradient based on the index you get rid of the 'very close together' problem.

However it would be easier to suggest possible solutions if you upload a gh file with the numbers and lines embedded in it.

Permalink Reply by VALENTINA on July 13, 2016 at 2:23am

Hi David,

I tried this solution, but I still have very similar colors. I tried to simplify my file and I uploaded it. Thank you very much!

Attachments:

gradient.gh, 13 KB

Permalink Reply by David Rutten on July 13, 2016 at 3:30am

I attached an implementation of my initial suggestion, except instead of using a Gradient (which necessarily consists of lots of colours that are very similar to other colours near them) I switched to a Populate 3d approach.

The Populate component fills a box shaped volume with 3d points that are all roughly equally far away from each other. By then mapping the XYZ coordinates to RGB channels I can create a palette of N colours that are all very different from each other.

Attachments:

gradient.gh, 25 KB

Permalink Reply by David Rutten on July 13, 2016 at 3:37am

And of course you can always manually create a palette. Upside is you can pick colours that have meaning to you, downside is that you may need to update the palette if the number of unique values changes.