gistfile1.txt

/**
  * Arrow 'plugin' for Raphael
  **/
  Raphael.fn.arrow = function(startx,starty,endx,endy,len,angle,color) {
    color = typeof(color) != 'undefined' ? color : "#888";
    
    var theta = Math.atan2((endy-starty),(endx-startx));
    var baseAngleA = theta + angle * Math.PI/180;
    var baseAngleB = theta - angle * Math.PI/180;
    var tipX = endx + len * Math.cos(theta);
    var tipY = endy + len * Math.sin(theta);
    var baseAX = endx - len * Math.cos(baseAngleA);
    var baseAY = endy - len * Math.sin(baseAngleA);
    var baseBX = endx - len * Math.cos(baseAngleB);
    var baseBY = endy - len * Math.sin(baseAngleB);
    var pathData = " M " + tipX      + " " + tipY +
                   " L " + baseAX  + " " + baseAY +
                   " L " + baseBX  + " " + baseBY +
                   " Z ";
    return {
      path: this.path({fill: color, stroke: "none"},pathData),
      type: 'arrow'
    };
  };
  
  /**
  * Connection, taken from graffle.js:
  * http://raphaeljs.com/graffle.js  author not cited, part of 
  * rapheal project?  http://raphaeljs.com
  **/
  Raphael.fn.connection = function (obj1, obj2, line, bg) {
      if (obj1.line && obj1.from && obj1.to) {
          line = obj1;
          obj1 = line.from;
          obj2 = line.to;
      }
      var bb1 = obj1.getBBox();
      var bb2 = obj2.getBBox();
      var p = [{x: bb1.x + bb1.width / 2, y: bb1.y - 1},
          {x: bb1.x + bb1.width / 2, y: bb1.y + bb1.height + 1},
          {x: bb1.x - 1, y: bb1.y + bb1.height / 2},
          {x: bb1.x + bb1.width + 1, y: bb1.y + bb1.height / 2},
          {x: bb2.x + bb2.width / 2, y: bb2.y - 1},
          {x: bb2.x + bb2.width / 2, y: bb2.y + bb2.height + 1},
          {x: bb2.x - 1, y: bb2.y + bb2.height / 2},
          {x: bb2.x + bb2.width + 1, y: bb2.y + bb2.height / 2}];
      var d = {}, dis = [];
      
      for (var i = 0; i < 4; i++) {
          var dx, dy;
          for (var j = 4; j < 8; j++) {
                  dx = Math.abs(p[i].x - p[j].x);
                  dy = Math.abs(p[i].y - p[j].y);
              if ((i == j - 4) || (((i != 3 && j != 6) || p[i].x < p[j].x) && ((i != 2 && j != 7) || p[i].x > p[j].x) && ((i != 0 && j != 5) || p[i].y > p[j].y) && ((i != 1 && j != 4) || p[i].y < p[j].y))) {
                  dis.push(dx + dy);
                  d[dis[dis.length - 1]] = [i, j];  
              }
          }
      }
      var res;
      if (dis.length == 0) {
          res = [0, 4];
      } else {
          res = d[Math.min.apply(Math, dis)];
      }
      var x1 = p[res[0]].x,
          y1 = p[res[0]].y,
          x4 = p[res[1]].x,
          y4 = p[res[1]].y,
          dx = Math.max(Math.abs(x1 - x4) / 2, 10),
          dy = Math.max(Math.abs(y1 - y4) / 2, 10),
          x2 = [x1, x1, x1 - dx, x1 + dx][res[0]].toFixed(3),
          y2 = [y1 - dy, y1 + dy, y1, y1][res[0]].toFixed(3),
          x3 = [0, 0, 0, 0, x4, x4, x4 - dx, x4 + dx][res[1]].toFixed(3),
          y3 = [0, 0, 0, 0, y1 + dy, y1 - dy, y4, y4][res[1]].toFixed(3);
      var path = ["M", x1.toFixed(3), y1.toFixed(3), "C", x2, y2, x3, y3, x4.toFixed(3), y4.toFixed(3)].join(",");
      if (line && line.line) {
          line.bg && line.bg.attr({path: path});
          line.line.attr({path: path});
      } else {
          var color = typeof line == "string" ? line : "#000";
          var strokeWidth = bg.split("|")[1] || 3;
          var stroke = bg.split("|")[0];
          return {
              bg: bg && bg.split && this.path({stroke: stroke, fill: "none", "stroke-width": strokeWidth}, path),
              line: this.path({stroke: color, fill: "none"}, path),
              arrow: this.arrow(x3,y3,x4,y4,strokeWidth * 2.0,50,color),
              from: obj1,
              to: obj2
          };
      }
  };
  

This one no longer works. I get errors around pathArray[0] in raphael.js