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Calculate ticks for gChart Y axis - accommodates large ranges

/ Published in: JavaScript
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This will calculate the ticks for google charts so that you can have a chart with a defined height, and still represent large data ranges with out all the vertical information getting bunched up together.

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  1. function compute_rank_ticks(min, max){
  2.     var start = min%2==1 ? min : min-1;
  3.     var end = max%2==1 ? max : max+1;
  4.     var span = end-start;
  5.     var step = 1;
  6.     var notches = Math.ceil(span/step);
  7.  
  8.     if(span == 0){
  9.       if(min == 1){
  10.         return [1, 2, 3];
  11.       }
  12.       else{
  13.         return [min - 1, min, min + 1];
  14.       }
  15.     }
  16.  
  17.     while(notches > 10){
  18.       step = step + 1;
  19.       notches = Math.ceil(span/step);
  20.     }
  21.  
  22.     var ticks = [];
  23.     var tick = start;
  24.     var i;
  25.     for(i=0; i<=notches; i++){
  26.       ticks.push(tick);
  27.       tick = tick + step;
  28.     }
  29.  
  30.     return ticks;
  31.   }

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