source: admin/js/jquery/jquery.bgFade.js @ 0:54703be25dd6

jQuery.fn.backgroundFade = function(s,callback) {
     var defaults = {
          sColor: [255,0,0],
          eColor: [255,255,255],
          fColor: null,
          steps: 200,
          intervals: 5,
          powr: 4
     },
     
     params = jQuery.extend(defaults,s);
     
     return this.each(function() {
          this.bgFade_sColor = jQuery.backgroundFade.parseHexColor(params.sColor);
          this.bgFade_eColor = jQuery.backgroundFade.parseHexColor(params.eColor);
          this.bgFade_fColor = params.fColor ? params.fColor : jQuery(this).css('backgroundColor');
          this.bgFade_steps = params.steps;
          this.bgFade_intervals = params.intervals;
          this.bgFade_powr = params.powr;
          this.bgFade_fn = callback;
          
          jQuery.backgroundFade.doFade(this);
     });
};

jQuery.backgroundFade = {
     parseHexColor: function(c) {
          if (c.constructor == String && c.substr(0,1) == '#') {
               return [parseInt(c.substr(1,2),16),parseInt(c.substr(3,2),16),parseInt(c.substr(5,2),16)];
          }
          return c;
     },
     
     easeInOut: function(minValue,maxValue,totalSteps,actualStep,powr) {
          var delta = maxValue - minValue;
          var stepp = minValue+(Math.pow(((1 / totalSteps)*actualStep),powr)*delta);
          return Math.ceil(stepp);
     },
     
     doFade: function(e) {
          if (e.bgFadeInt) window.clearInterval(e.bgFadeInt);
          var act_step = 0;
          
          e.bgFadeInt = window.setInterval(function() {
               e.style.backgroundColor =
               "rgb("+
               jQuery.backgroundFade.easeInOut(e.bgFade_sColor[0],e.bgFade_eColor[0],
                    e.bgFade_steps,act_step,e.bgFade_powr)+","+
               jQuery.backgroundFade.easeInOut(e.bgFade_sColor[1],e.bgFade_eColor[1],
                    e.bgFade_steps,act_step,e.bgFade_powr)+","+
               jQuery.backgroundFade.easeInOut(e.bgFade_sColor[2],e.bgFade_eColor[2],
                    e.bgFade_steps,act_step,e.bgFade_powr)+")";
               
               act_step++;
               if (act_step > e.bgFade_steps) {
                    window.clearInterval(e.bgFadeInt);
                    e.bgFade_sColor = undefined;
                    e.bgFade_eColor = undefined;
                    e.bgFade_fColor = undefined;
                    e.bgFade_steps = undefined;
                    e.bgFade_intervals = undefined;
                    e.bgFade_powr = undefined;
                    if (typeof(e.bgFade_fn) == 'function') {
                         e.bgFade_fn.call(e);
                    }
                    e.style.backgroundColor = e.bgFade_fColor;
               }
          },e.bgFade_intervals);
     }
};