--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/svg/symbol.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,98 @@
+d3.svg.symbol = function() {
+  var type = d3_svg_symbolType,
+      size = d3_svg_symbolSize;
+
+  function symbol(d, i) {
+    return (d3_svg_symbols[type.call(this, d, i)]
+        || d3_svg_symbols.circle)
+        (size.call(this, d, i));
+  }
+
+  symbol.type = function(x) {
+    if (!arguments.length) return type;
+    type = d3.functor(x);
+    return symbol;
+  };
+
+  // size of symbol in square pixels
+  symbol.size = function(x) {
+    if (!arguments.length) return size;
+    size = d3.functor(x);
+    return symbol;
+  };
+
+  return symbol;
+};
+
+function d3_svg_symbolSize() {
+  return 64;
+}
+
+function d3_svg_symbolType() {
+  return "circle";
+}
+
+// TODO cross-diagonal?
+var d3_svg_symbols = {
+  "circle": function(size) {
+    var r = Math.sqrt(size / Math.PI);
+    return "M0," + r
+        + "A" + r + "," + r + " 0 1,1 0," + (-r)
+        + "A" + r + "," + r + " 0 1,1 0," + r
+        + "Z";
+  },
+  "cross": function(size) {
+    var r = Math.sqrt(size / 5) / 2;
+    return "M" + -3 * r + "," + -r
+        + "H" + -r
+        + "V" + -3 * r
+        + "H" + r
+        + "V" + -r
+        + "H" + 3 * r
+        + "V" + r
+        + "H" + r
+        + "V" + 3 * r
+        + "H" + -r
+        + "V" + r
+        + "H" + -3 * r
+        + "Z";
+  },
+  "diamond": function(size) {
+    var ry = Math.sqrt(size / (2 * d3_svg_symbolTan30)),
+        rx = ry * d3_svg_symbolTan30;
+    return "M0," + -ry
+        + "L" + rx + ",0"
+        + " 0," + ry
+        + " " + -rx + ",0"
+        + "Z";
+  },
+  "square": function(size) {
+    var r = Math.sqrt(size) / 2;
+    return "M" + -r + "," + -r
+        + "L" + r + "," + -r
+        + " " + r + "," + r
+        + " " + -r + "," + r
+        + "Z";
+  },
+  "triangle-down": function(size) {
+    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
+        ry = rx * d3_svg_symbolSqrt3 / 2;
+    return "M0," + ry
+        + "L" + rx +"," + -ry
+        + " " + -rx + "," + -ry
+        + "Z";
+  },
+  "triangle-up": function(size) {
+    var rx = Math.sqrt(size / d3_svg_symbolSqrt3),
+        ry = rx * d3_svg_symbolSqrt3 / 2;
+    return "M0," + -ry
+        + "L" + rx +"," + ry
+        + " " + -rx + "," + ry
+        + "Z";
+  }
+};
+
+d3.svg.symbolTypes = d3.keys(d3_svg_symbols);
+
+var d3_svg_symbolSqrt3 = Math.sqrt(3),
+    d3_svg_symbolTan30 = Math.tan(30 * Math.PI / 180);