rounded_corners.inc.js

来自「PHP 知识管理系统（基于树结构的知识管理系统）, 英文原版的PHP源码。」· JavaScript 代码 · 共 1,115 行 · 第 1/4 页

          yvalues[point] = intersect - y;
          point =  point + 1;
      }
      // y + 0 = Bottom
      var intersect = Math.sqrt((Math.pow(r,2) - Math.pow(y,2)));

      if ((intersect >= x) && (intersect < (x+1)))
      {
          whatsides = whatsides + "Bottom";
          xvalues[point] = intersect - x;
          yvalues[point] = 0;
      }

      /*
      depending on which sides of the perimeter of the pixel the circle crosses calculate the
      fraction of the pixel inside the circle
      */
      switch (whatsides)
      {
              case "LeftRight":
              pixelfraction = Math.min(yvalues[0],yvalues[1]) + ((Math.max(yvalues[0],yvalues[1]) - Math.min(yvalues[0],yvalues[1]))/2);
              break;

              case "TopRight":
              pixelfraction = 1-(((1-xvalues[0])*(1-yvalues[1]))/2);
              break;

              case "TopBottom":
              pixelfraction = Math.min(xvalues[0],xvalues[1]) + ((Math.max(xvalues[0],xvalues[1]) - Math.min(xvalues[0],xvalues[1]))/2);
              break;

              case "LeftBottom":
              pixelfraction = (yvalues[0]*xvalues[1])/2;
              break;

              default:
              pixelfraction = 1;
      }

      return pixelfraction;
  }


  // This function converts CSS rgb(x, x, x) to hexadecimal
  function rgb2Hex(rgbColour)
  {
      try{

          // Get array of RGB values
          var rgbArray = rgb2Array(rgbColour);

          // Get RGB values
          var red   = parseInt(rgbArray[0]);
          var green = parseInt(rgbArray[1]);
          var blue  = parseInt(rgbArray[2]);

          // Build hex colour code
          var hexColour = "#" + IntToHex(red) + IntToHex(green) + IntToHex(blue);
      }
      catch(e){

          alert("There was an error converting the RGB value to Hexadecimal in function rgb2Hex");
      }

      return hexColour;
  }

  // Returns an array of rbg values
  function rgb2Array(rgbColour)
  {
      // Remove rgb()
      var rgbValues = rgbColour.substring(4, rgbColour.indexOf(")"));

      // Split RGB into array
      var rgbArray = rgbValues.split(", ");

      return rgbArray;
  }

  /*
  Function by Simon Willison from sitepoint.com
  Modified by Cameron Cooke adding Safari's rgba support
  */
  function setOpacity(obj, opacity)
  {
      opacity = (opacity == 100)?99.999:opacity;

      if(isSafari && obj.tagName != "IFRAME")
      {
          // Get array of RGB values
          var rgbArray = rgb2Array(obj.style.backgroundColor);

          // Get RGB values
          var red   = parseInt(rgbArray[0]);
          var green = parseInt(rgbArray[1]);
          var blue  = parseInt(rgbArray[2]);

          // Safari using RGBA support
          obj.style.backgroundColor = "rgba(" + red + ", " + green + ", " + blue + ", " + opacity/100 + ")";
      }
      else if(typeof(obj.style.opacity) != "undefined")
      {
          // W3C
          obj.style.opacity = opacity/100;
      }
      else if(typeof(obj.style.MozOpacity) != "undefined")
      {
          // Older Mozilla
          obj.style.MozOpacity = opacity/100;
      }
      else if(typeof(obj.style.filter) != "undefined")
      {
          // IE
          obj.style.filter = "alpha(opacity:" + opacity + ")";
      }
      else if(typeof(obj.style.KHTMLOpacity) != "undefined")
      {
          // Older KHTML Based Browsers
          obj.style.KHTMLOpacity = opacity/100;
      }
  }

  /*
  Returns index if the passed value is found in the
  array otherwise returns false.
  */
  function inArray(array, value)
  {
      for(var i = 0; i < array.length; i++){

          // Matches identical (===), not just similar (==).
          if (array[i] === value) return i;
      }

      return false;
  }

  /*
  Returns true if the passed value is found as a key
  in the array otherwise returns false.
  */
  function inArrayKey(array, value)
  {
      for(key in array){

          // Matches identical (===), not just similar (==).
          if(key === value) return true;
      }

      return false;
  }

  // Cross browser add event wrapper
  function addEvent(elm, evType, fn, useCapture) {
	  if (elm.addEventListener) {
		  elm.addEventListener(evType, fn, useCapture);
		  return true;
	  }
	  else if (elm.attachEvent) {
		  var r = elm.attachEvent('on' + evType, fn);
		  return r;
	  }
	  else {
		  elm['on' + evType] = fn;
	  }
  }

  // Cross browser remove event wrapper
  function removeEvent(obj, evType, fn, useCapture){
    if (obj.removeEventListener){
      obj.removeEventListener(evType, fn, useCapture);
      return true;
    } else if (obj.detachEvent){
      var r = obj.detachEvent("on"+evType, fn);
      return r;
    } else {
      alert("Handler could not be removed");
    }
  }

  // Formats colours
  function format_colour(colour)
  {
      var returnColour = "#ffffff";

      // Make sure colour is set and not transparent
      if(colour != "" && colour != "transparent")
      {
          // RGB Value?
          if(colour.substr(0, 3) == "rgb")
          {
              // Get HEX aquiv.
              returnColour = rgb2Hex(colour);
          }
          else if(colour.length == 4)
          {
              // 3 chr colour code add remainder
              returnColour = "#" + colour.substring(1, 2) + colour.substring(1, 2) + colour.substring(2, 3) + colour.substring(2, 3) + colour.substring(3, 4) + colour.substring(3, 4);
          }
          else
          {
              // Normal valid hex colour
              returnColour = colour;
          }
      }

      return returnColour;
  }

  // Returns the style value for the property specfied
  function get_style(obj, property, propertyNS)
  {
      try
      {
          if(obj.currentStyle)
          {
              var returnVal = eval("obj.currentStyle." + property);
          }
          else
          {
              /*
              Safari does not expose any information for the object if display is
              set to none is set so we temporally enable it.
              */
              if(isSafari && obj.style.display == "none")
              {
                obj.style.display = "";
                var wasHidden = true;
              }

              var returnVal = document.defaultView.getComputedStyle(obj, '').getPropertyValue(propertyNS);

              // Rehide the object
              if(isSafari && wasHidden)
              {
                  obj.style.display = "none";
              }
          }
      }
      catch(e)
      {
          // Do nothing
      }

      return returnVal;
  }

  // Get elements by class by Dustin Diaz.
  function getElementsByClass(searchClass, node, tag)
  {
	     var classElements = new Array();

      if(node == null)
		      node = document;
	     if(tag == null)
		      tag = '*';

	     var els = node.getElementsByTagName(tag);
	     var elsLen = els.length;
	     var pattern = new RegExp("(^|\s)"+searchClass+"(\s|$)");

	     for (i = 0, j = 0; i < elsLen; i++)
      {
		        if(pattern.test(els[i].className))
          {
			           classElements[j] = els[i];
			           j++;
		        }
	     }

	     return classElements;
  }

  // Displays error message
  function newCurvyError(errorMessage)
  {
      return new Error("curvyCorners Error:\n" + errorMessage)
  }