Demo tween alphanumeric

HTML

<script src="http://chrisloughnane.net/libraries/d3.v3.min.js"></script>

JavaScript

var width = 1200,
    height = 1200;
 
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);

var d0 = "m170,0l0,53q78,9 130,20t83,24t44,23t13,23l0,797q0,40 -3,62t-15,36q-6,6 -23,10t-48,3t-78,-7t-113,-20l-21,51q42,12 99,33t117,45t112,49t86,43l37,-35l0,-1067q0,-10 11,-21t39,-24t76,-24t124,-21l0,-53l-670,0z",
        d1 = "m821,0l-694,0l-29,74q119,138 207,244t152,187t104,143t65,110t33,88t9,78q0,46 -11,86t-35,71t-62,47t-93,17q-41,0 -75,-20t-59,-50t-39,-68t-14,-73q-17,-9 -30,-17t-28,-14t-30,-11t-40,-7l-27,30q0,52 35,108t93,104t131,77t151,31q60,0 112,-17t92,-51t61,-88t23,-127q0,-45 -13,-90t-40,-97t-71,-115t-106,-139t-143,-174t-184,-216l418,0q17,0 30,7t24,20t18,29t13,33q12,39 17,89l50,-12l-15,-287z ",
        d2 = "m748,493q0,-84 -27,-159t-80,-131t-131,-88t-181,-33q-39,0 -80,7t-83,24t-86,46t-89,72l34,67q45,-34 82,-56t71,-35t67,-19t71,-6q61,0 111,19t86,56t55,87t20,116q0,75 -23,127t-60,86t-82,47t-90,15l-21,0q-6,0 -11,-1t-13,-2t-23,-4l-14,60q92,25 147,58t84,68t39,71t10,67q0,34 -10,70t-33,67t-57,49t-82,19q-40,0 -71,-14t-53,-38t-29,-55t-3,-65q-34,-17 -65,-26t-74,-13l-27,31q0,42 31,89t83,88t120,66t145,27q75,0 128,-24t89,-63t51,-89t17,-101q0,-38 -15,-75t-42,-71t-67,-63t-89,-51q57,-7 106,-34t86,-70t57,-97t21,-116z",
        d4 = "m585,1040l-372,-580l372,0l0,580zm289,-610q-21,-32 -38,-47t-41,-33l-70,0l0,-246q0,-8 6,-14t22,-14t43,-16t68,-17l0,-43l-489,0l0,43q65,11 106,20t64,18t31,17t9,17l0,235l-497,0l-33,33l496,791q42,18 75,37t62,34l37,-35l0,-750l123,0l26,-30z",
        d5 = "m836,410q0,-87 -26,-166t-77,-141t-125,-97t-168,-36q-93,0 -184,34t-178,115l35,67q53,-37 96,-59t81,-35t68,-17t60,-5q65,0 113,25t81,66t48,95t16,111q0,68 -16,124t-50,95t-85,62t-122,22q-21,0 -48,-5t-56,-15t-59,-25t-56,-35l-47,33q6,36 14,83t16,101t17,108t16,108t12,100t7,82l436,0q29,0 51,2t38,7q18,4 32,9l29,-29q-11,-16 -25,-33t-30,-34t-29,-29t-27,-23l-387,0q-2,-29 -7,-74t-11,-93t-14,-90t-11,-64q40,12 94,19t105,7q91,0 160,-30t117,-82t71,-118t25,-140z",
        d6 =...