git.pond.sub.org Git - eow/blob - static/dojo-release-1.1.1/dojox/charting/_color.js

   1 if(!dojo._hasResource["dojox.charting._color"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
   2 dojo._hasResource["dojox.charting._color"] = true;
   3 dojo.provide("dojox.charting._color");
   4
   5 dojox.charting._color={};
   6 dojox.charting._color.fromHsb=function(/* int */hue, /* int */saturation, /* int */brightness){
   7         //      summary
   8         //      Creates an instance of dojo.Color based on HSB input (360, %, %)
   9         hue=Math.round(hue);
  10         saturation=Math.round((saturation/100)*255);
  11         brightness=Math.round((brightness/100)*255);
  12
  13         var r, g, b;
  14         if(saturation==0){
  15                 r=g=b=brightness;
  16         } else {
  17                 var tint1=brightness,
  18                         tint2=(255-saturation)*brightness/255,
  19                         tint3=(tint1-tint2)*(hue%60)/60;
  20                 if(hue<60){ r=tint1, g=tint2+tint3, b=tint2; }
  21                 else if(hue<120){ r=tint1-tint3, g=tint1, b=tint2; }
  22                 else if(hue<180){ r=tint2, g=tint1, b=tint2+tint3; }
  23                 else if(hue<240){ r=tint2, g=tint1-tint3, b=tint1; }
  24                 else if(hue<300){ r=tint2+tint3, g=tint2, b=tint1; }
  25                 else if(hue<360){ r=tint1, g=tint2, b=tint1-tint3; }
  26         }
  27
  28         r=Math.round(r); g=Math.round(g); b=Math.round(b);
  29         return new dojo.Color({ r:r, g:g, b:b });
  30 };
  31
  32 dojox.charting._color.toHsb=function(/* int|Object|dojo.Color */ red, /* int? */ green, /* int? */blue){
  33         //      summary
  34         //      Returns the color in HSB representation (360, %, %)
  35         var r=red,g=green,b=blue;
  36         if(dojo.isObject(red)){
  37                 r=red.r,g=red.g,b=red.b;
  38         }
  39         var min=Math.min(r,g,b);
  40         var max=Math.max(r,g,b);
  41         var delta=max-min;
  42
  43         var hue=0, saturation=(max!=0?delta/max:0), brightness=max/255;
  44         if(saturation==0){ hue=0; }
  45         else {
  46                 if(r==max){ hue=((max-b)/delta)-((max-g)/delta); }
  47                 else if(g==max){ hue=2+(((max-r)/delta)-((max-b)/delta)); }
  48                 else { hue=4+(((max-g)/delta)-((max-r)/delta)); }
  49                 hue/=6;
  50                 if(hue<0) hue++;
  51         }
  52
  53         hue=Math.round(hue*360);
  54         saturation=Math.round(saturation*100);
  55         brightness=Math.round(brightness*100);
  56         return {
  57                 h:hue, s:saturation, b:brightness,
  58                 hue:hue, saturation:saturation, brightness:brightness
  59         };      //      Object
  60 };
  61
  62 }