/**
 *  jQuery Plugin textgrad, version 0
 *  (c) 2007 Guillaume Andrieu, subtenante@yahoo.fr
 *  http://www.agencenp.net/textgrad/textgrad.html
 *  Licensed GPL licenses:
 *   http://www.gnu.org/licenses/gpl.html
 */
(function($){
  // SPANIZE routine
  $.spanizeText = function(obj,spanClass,maxGroup){
    var text=$(obj).html();
    var res = "";
    var tag="";
    var spanlength=1;
    var reg = new RegExp ("^([^\\s<&]|&[a-z]*;){1,"+maxGroup+"}");
    while (text.length>0) {
      if (tag=text.match(/^(\s|(<[^>]*>))+\s*/)) {
        if (tag.length>0) {
          text = text.substr(tag[0].length);
          res+=tag[0];
        }
      }
      if (tag=text.match(reg)){
        spanlength=tag[0].length;
      } else {
        spanlength=1;
      }
      res+="<span"+(spanClass==''?'':' class="'+spanClass+'"')+">"+text.substring(0,spanlength)+"</span>";
      text=text.substring(spanlength);
    }
    $(obj).html(res);
  };

  // spanize jquery function
  $.fn.spanize = function(spanClass,maxGroup){
    $(this).each(function(){$.spanizeText(this,spanClass,maxGroup);});
  };

  // UNSPANIZE routine
  $.unspanize = function(obj,spanClass){
    var text=$(obj).html();
    var reg = new RegExp ("<(?:span|SPAN)[^>]*"+(spanClass==''?'':' class=(?:"|\')?'+spanClass+'(?:"|\')?')+">([^<\\s]+)</(?:span|SPAN)>",'g');
    text=text.replace(reg,"$1");
    //alert($(obj).html()+"\n\n"+text);
    $(obj).html(text);
  };

  // unspanize jquery function
  $.fn.unspanize = function(spanClass){
    $(this).each(function(){$.unspanize(this,spanClass);});
  }

  $.str2color = function(str){
    if (str && str.constructor == Array && str.length == 3) return str;
    var res;
    if (str.match(/rgb\([0-9]{1,3},[0-9]{1,3},[0-9]{1,3}\)/)){
      str.replace("rgb(","");str.replace(")","");
      res=str.split(",");
      for(i=0;i<3;i++){if (res[i]>255) res[i]=255;}
      return res;
    } else if (str.match(/#?[0-9a-fA-F]{6}/)){
      if(str.length==7) str=str.substring(1);
      res = [parseInt(str.substring(0,2),16),
             parseInt(str.substring(2,4),16),
             parseInt(str.substring(4,6),16)];

    } else if(str.match(/#?[0-9a-fA-F]{3}/)){
      if (str.length==4) str=str.substring(1);
      res = [parseInt(str.substring(0,1)+str.substring(0,1),16),
             parseInt(str.substring(1,2)+str.substring(1,2),16),
             parseInt(str.substring(2,3)+str.substring(2,3),16)];
    } else {
      res = [0,0,0];
    }
    return res;
  };


  // DEFAULTS for textgrad
  $.textGrad = {};
  $.textGrad.defaults = {
    debut:'F00',
    fin:'0FF',
    maxGroup:3,
    type:'',
    spanClass:''
  };

  // textgrad jquery function
  $.fn.textgrad=function(settings){

    //+++++ FUNCTIONS
    var abspos = function(jobj){
      var curleft = 0;
      var curtop = 0;
      if (jobj.offsetParent) {
        curleft += jobj.offsetLeft;
        curtop += jobj.offsetTop;
        var obj=jobj;
        while (obj = obj.offsetParent) {
          curleft += obj.offsetLeft;
          curtop += obj.offsetTop;
        }
      }
      return [curleft,curtop];
    };
        
    var pos = function(jobj){
      var res=abspos(jobj);
      return [res[0]-0.5*jobj.offsetWidth,res[1]+0.5*jobj.offsetHeight];
    };
    
    var boxpos = function(jobj){
      var tpos = abspos(jobj);
      $(jobj).prepend('<span class="test">p</span>');
      var res = [tpos[0]+0.5*$('span.test',jobj).get(0).offsetWidth,
      tpos[1]+0.5*$('span.test',jobj).get(0).offsetHeight,
      jobj.offsetWidth-0.5*$('span.test',jobj).get(0).offsetWidth,
      jobj.offsetHeight-0.5*$('span.test',jobj).get(0).offsetHeight];
      //$('span.test',jobj).lt(1).remove();
      $('span.test',jobj).remove();
      return res;
    };
  
    var spandim = function(span){
      var tpos = pos(span);
      var res = [tpos[0],tpos[1],0.5*span.offsetWidth,0.5*span.offsetHeight];
      return res;
    };
  
    var pickingrad = function(point){
      if (grad.length==0) return [0,0,0];
      if (grad.length==1) return grad[0]['col'];
  
      point=100*point;  
      if (point<=grad[0]['pc']) {
        //alert(point+" "+grad[0]['col']);
        return grad[0]['col'];}
      if (point>=grad[grad.length-1]['pc']) {
        //alert(point+" "+grad[0]['col']);
        return grad[grad.length-1]['col'];
      }

      var mins=0;var maxs=100;var minc=[0,0,0];var maxc=[0,0,0];
      var i=0;
      while(point>=grad[i]['pc'] && i<grad.length){mins=grad[i]['pc'];minc=grad[i]['col'];i++;}
      i=grad.length-1;
      while(point<=grad[i]['pc'] && i>=0){maxs=grad[i]['pc'];maxc=grad[i]['col'];i--;}
      var res=[0,0,0];
      var mult = (point-mins)/(maxs-mins);
      for(i=0;i<3;i++){res[i]=minc[i]+(maxc[i]-minc[i])*mult;}
      //alert(minc+"\n"+maxc+"\n"+point+"\n"+mult+"\n"+res);
      return res;
    };

    var getcolor = function(span,bp){
      var sp=spandim(span);
      var res=[0,0,0];
      if (type=='|'){
        var delta=(sp[1]-bp[1])/bp[3];
      } else if (type=='o') {
        Cx=bp[0]+bp[2]/2;Cy=bp[1]+bp[3]/2;
        r=Math.sqrt((Cx-sp[0])*(Cx-sp[0])+(Cy-sp[1])*(Cy-sp[1]));
        R=Math.sqrt((bp[2])*(bp[2])/4+(bp[3])*(bp[3])/4);
        var delta =r/R;
      } else if (type=='_' || 2.5*sp[3]>bp[3]) {
        var delta=(sp[0]-bp[0])/bp[2];
      } else if (type=='/') {
        multx=(sp[0]-bp[0])/bp[2];
        multy=(bp[3]-sp[1]+bp[1])/bp[3];
        var delta = (multx+multy)/2;
      } else {
        multx=(sp[0]-bp[0])/bp[2];
        multy=(sp[1]-bp[1])/bp[3];
        var delta = (multx+multy)/2;
      }
      var res = pickingrad(delta);
      res = "rgb("+Math.round(res[0])+","+Math.round(res[1])+","+Math.round(res[2])+")";
      //alert(sp+"\n"+bp+"\n"+$(span).text()+"\n"+res);       
      return res;
    };

    var treatgrad=function(){
      for(i=0;i<opt['colgrad'].length;i++){
        opt['colgrad'][i]['col']=$.str2color(opt['colgrad'][i]['col']);
      }
      return opt['colgrad'];
    };

    //----- FUNCTIONS

    //+++++ PARAMS
    var opt = settings||{};
    var d = $.textGrad.defaults;
    var coldeb=$.str2color(opt['debut']||opt['begin']||d['debut']);
    var colfin=$.str2color(opt['fin']||opt['end']||d['fin']);
    var grad=opt['colgrad']?treatgrad():[{pc:0,col:coldeb},{pc:100,col:colfin}];
    var maxGroup = opt['maxGroup']||d['maxGroup'];
    var type = opt['type']||d['type'];
    var spanize = opt['spanize']||1;
    var spanClass = opt['spanClass']||d['spanClass'];
    //----- PARAMS

    $(this).each(function() {

      if (spanize>0) $.spanizeText(this,spanClass,maxGroup);
      var blockpos=boxpos(this);
      $("span"+(spanClass==''?'':'.'+spanClass),this).each(function(){$(this).css('color',getcolor(this,blockpos))});
      if (opt['cb'] && opt['cb'].constructor == Function) opt['cb'].call(this);

    });//EO $(this).each(...);
  };//EO $.fn.textgrad

  // textscan jquery function
  $.fn.textscan = function(settings){
    var opt = settings||{};
    var initColor = $.str2color(opt['initColor']||"000");  
    var endColor  = $.str2color(opt['endColor']||"F00");
    var transColor= $.str2color(opt['transColor']||"FFF");
    var spcl = opt['spanClass']||'animgradsp';
    var direction = opt['direction']||'->';
    var mg = opt['maxGroup']||2;
    var spnz = opt['spanize']||1;
    var unspnz = opt['unspanize']||1;
    var amplitude = opt['amplitude']||20;
    var step = opt['step']||5;
    
    $(this).each(function(){
      var timer;
      var steps = 100+2*amplitude;
      var currStep=(direction=='->'?0:100);
      var grad;
      var obj=this;
      $(this).textgrad({
        spanize:spnz,maxGroup:mg,spanClass:spcl,debut:initColor,fin:initColor
      });
      timer = window.setInterval(function() {
        if(direction=='->'){
          currStep+=step;
          grad=[{pc:currStep-2*amplitude,col:endColor}
               ,{pc:currStep-amplitude,col:transColor}
               ,{pc:currStep,col:initColor}];
        } else {
          currStep-=step;
          grad=[{pc:currStep,col:initColor}
             ,{pc:currStep+amplitude,col:transColor}
             ,{pc:currStep+2*amplitude,col:endColor}];
        }
        $(obj).textgrad({spanize:-1,spanClass:spcl,colgrad:grad});
        // End the process
        if (currStep >= steps+1 || currStep<=-2*amplitude-1) {
          if (unspnz>0) {
            $.unspanize(obj,spcl);
          }
          window.clearInterval(timer);timer=null;
          if (opt['cb'] && opt['cb'].constructor == Function) opt['cb'].call(obj);
        }
      },50);
    });//EO each
  };//EO textscan*/
})(jQuery);