deviding an array into somewhat equal parts?

Projects Programming
1

Hello,

I am looking for a simpler way to divide an array into 12 equal parts... (or somewhat equal)

i did this:

CRGB temp[patternLength];

  if (justonce == 0) {
    justonce = 1;
    fill_gradient(temp, 0, CHSV(20, 255, 240) , patternLength / 6, CHSV(20, 255, 240));
    fill_gradient(temp, patternLength / 6, CHSV(20, 255, 240) , ((patternLength / 6) + (patternLength / 12)), CHSV(20, 80, 200));
    fill_gradient(temp, ((patternLength / 6) + (patternLength / 12)), CHSV(20, 80, 200) , patternLength / 3, CHSV(160, 255, 255));
    fill_gradient(temp, (patternLength / 3), CHSV(160, 255, 255) , (2 * patternLength / 3), CHSV(160, 255, 255));
    fill_gradient(temp, (2 * patternLength / 3), CHSV(160, 255, 255) , ((2 * patternLength / 3) + (patternLength / 12)), CHSV(160, 80, 200));
    fill_gradient(temp, ((2 * patternLength / 3) + (patternLength / 12)), CHSV(160, 80, 200) , (5 * patternLength / 6), CHSV(20, 255, 240));
    fill_gradient(temp, (5 * patternLength / 6), CHSV(20, 255, 240) , patternLength, CHSV(20, 255, 240));
  }

but, its very sloppy.. and it doesn't seem to work well.

basically, it divides the array into 12ths, and fills in a color... is there an easier way to do this? I thought of the modulus operator, but i'm not sure how it would work here.

2

Is your array length divisible by 12 without remainder? Cause then its pretty easy to address arrays elements using pointers:

* ( yourArray + ( segmentLength * segmentIndex ) + indexInSegment )

// PS: segmentLength is 1/12 of yourArray length
// so indexInSegment should be between 0 and segmentLength-1
// and segmentIndex is between 0 and 11
3

I could make it evenly divisible, but I don't understand your code

basically,

fill_gradient(temp, 0, CHSV(20, 255, 240) , patternLength / 12, CHSV(20, 255, 240));

temp is the array, 0 is where the segment of the array starts, chsv is the start color, patternLength /12 is the end of the segment, and finally the end color

how would I use a pointer there?

4

I guess your function does all the work for you then.

Sorry, I don't understand what you mean by 'divide an array into 12 equal parts', can you explain better?