added fibonacci algorithm to render the arcs

[tech-radar.git] / src / graphing / radar.js

diff --git a/src/graphing/radar.js b/src/graphing/radar.js
index 2f472f9..704c572 100644 (file)
--- a/src/graphing/radar.js
+++ b/src/graphing/radar.js
@@ -1,20 +1,74 @@
 tr.graphing.Radar = function (svg, size, radar) {
-  var self = {};
+  var self, fib;
+  self = {};
+  fib = new tr.util.Fib();
 
   svg.attr('width', size).attr('height', size);
 
+  function center () {
+    return Math.round(size/2);
+  }
+
   function plotLines() {
     svg.append('line')
-      .attr('x1', size / 2)
+      .attr('x1', center())
       .attr('y1', 0)
-      .attr('x2', size / 2)
+      .attr('x2', center())
       .attr('y2', size)
-      .attr('stroke-width', 5);
+      .attr('stroke-width', 14);
+
+    svg.append('line')
+      .attr('x1', 0)
+      .attr('y1', center())
+      .attr('x2', size)
+      .attr('y2', center())
+      .attr('stroke-width', 14);
+  };
+
+  function getRadius(cycles, i) {
+    var sequence = fib.sequence(cycles.length);
+    var total = fib.sum(cycles.length);
+    var sum = fib.sum(i);
+
+    return center() - (center() * sum / total);
+  }
+
+  function plotCircles(cycles) {
+    var increment;
+
+    cycles.forEach(function (cycle, i) {
+      svg.append('circle')
+        .attr('cx', center())
+        .attr('cy', center())
+        .attr('r', getRadius(cycles, i));
+    });
+  }
+
+  function plotTexts(cycles) {
+    var increment;
+
+    increment = Math.round(center() / cycles.length);
+
+    cycles.forEach(function (cycle, i) {
+      svg.append('text')
+        .attr('y', center() + 4)
+        .attr('x', center() - getRadius(cycles, i) + 10)
+        .text(cycle.name());
+
+      svg.append('text')
+        .attr('y', center() + 4)
+        .attr('x', center() + getRadius(cycles, i) - 10)
+        .attr('text-anchor', 'end')
+        .text(cycle.name());
+    });
   };
 
   self.plot = function () {
-    plotLines();
+    var cycles = radar.cycles().reverse();
 
+    plotCircles(cycles);
+    plotLines();
+    plotTexts(cycles);
   };
 
   return self;