mbostock · October 17, 2017 17:20 · Feb 9, 2016 · Oct 31, 2015 · Jun 11, 2015 · Jun 11, 2015
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diff --git a/README.md b/README.md
@@ -1 +1 @@
-The University of Florida [Sparse Matrix Collection](http://www.cise.ufl.edu/research/sparse/matrices/) provides a vast collection of interesting graphs in Matrix Market format. This example shows how to adapt this format to D3's force layout.
+This example demonstrates rendering a [D3](http://d3js.org) [force-directed graph](http://mbostock.github.com/d3/ex/force.html) using Canvas rather than SVG. The performance is slightly better than SVG, but unlike the SVG version, the nodes in this one are not draggable.
diff --git a/can_161.mtx b/can_161.mtx
@@ -1,783 +0,0 @@
-%%MatrixMarket matrix coordinate pattern symmetric
-%-------------------------------------------------------------------------------
-% UF Sparse Matrix Collection, Tim Davis
-% http://www.cise.ufl.edu/research/sparse/matrices/HB/can_161
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-% [SYMMETRIC PATTERN FROM CANNES,LUCIEN MARRO,JUNE 1981.]
-% id: 94
-% date: 1981
-% author: L. Marro
-% ed: I. Duff, R. Grimes, J. Lewis
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diff --git a/index.html b/index.html
@@ -1,48 +1,21 @@
 <!DOCTYPE html>
 <meta charset="utf-8">
-<style>
-
-body {
-  margin: 0;
-}
-
-.node {
-  fill: steelblue;
-}
-
-.link {
-  stroke: #ccc;
-}
-
-</style>
 <body>
-<script src="http://d3js.org/d3.v2.js?2.9.1"></script>
+<script src="http://d3js.org/d3.v2.js?2.9.6"></script>
 <script>
 
 var width = 960,
     height = 500;
 
-var svg = d3.select("body").append("svg")
+var canvas = d3.select("body").append("canvas")
     .attr("width", width)
     .attr("height", height);
 
 var force = d3.layout.force()
     .size([width, height]);
 
-d3.text("can_161.mtx", function(text) {
-  var graph = parseMtx(text);
-
-  var link = svg.selectAll(".link")
-      .data(graph.links)
-    .enter().append("line")
-      .attr("class", "link");
-
-  var node = svg.selectAll(".node")
-      .data(graph.nodes)
-    .enter().append("circle")
-      .attr("class", "node")
-      .attr("r", 4.5)
-      .call(force.drag);
+d3.json("readme.json", function(graph) {
+  var context = canvas.node().getContext("2d");
 
   force
       .nodes(graph.nodes)
@@ -51,36 +24,25 @@
       .start();
 
   function tick() {
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-
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-        .attr("cy", function(d) { return d.y; });
+    context.clearRect(0, 0, width, height);
+
+    // draw links
+    context.strokeStyle = "#ccc";
+    context.beginPath();
+    graph.links.forEach(function(d) {
+      context.moveTo(d.source.x, d.source.y);
+      context.lineTo(d.target.x, d.target.y);
+    });
+    context.stroke();
+
+    // draw nodes
+    context.fillStyle = "steelblue";
+    context.beginPath();
+    graph.nodes.forEach(function(d) {
+      context.arc(d.x, d.y, 4.5, 0, 2 * Math.PI);
+    });
+    context.fill();
   }
 });
 
-function parseMtx(text) {
-  var nodes = [];
-
-  var links = text
-      .split(/\n/g) // split lines
-      .filter(function(d) { return d.charAt(0) != "%"; }) // skip comments
-      .slice(1, -1) // skip header line, last line
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-        return {
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-          target: nodes[target] || (nodes[target] = {index: target})
-        };
-      });
-
-  return {
-    nodes: nodes,
-    links: links
-  };
-}
-
 </script>
diff --git a/readme.json b/readme.json
@@ -0,0 +1 @@
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diff --git a/README.md b/README.md
@@ -0,0 +1 @@
+The University of Florida [Sparse Matrix Collection](http://www.cise.ufl.edu/research/sparse/matrices/) provides a vast collection of interesting graphs in Matrix Market format. This example shows how to adapt this format to D3's force layout.
diff --git a/can_161.mtx b/can_161.mtx
@@ -0,0 +1,783 @@
+%%MatrixMarket matrix coordinate pattern symmetric
+%-------------------------------------------------------------------------------
+% UF Sparse Matrix Collection, Tim Davis
+% http://www.cise.ufl.edu/research/sparse/matrices/HB/can_161
+% name: HB/can_161
+% [SYMMETRIC PATTERN FROM CANNES,LUCIEN MARRO,JUNE 1981.]
+% id: 94
+% date: 1981
+% author: L. Marro
+% ed: I. Duff, R. Grimes, J. Lewis
+% fields: title A name id date author ed kind
+% kind: structural problem
+%-------------------------------------------------------------------------------
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diff --git a/index.html b/index.html
@@ -0,0 +1,86 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<style>
+
+body {
+  margin: 0;
+}
+
+.node {
+  fill: steelblue;
+}
+
+.link {
+  stroke: #ccc;
+}
+
+</style>
+<body>
+<script src="http://d3js.org/d3.v2.js?2.9.1"></script>
+<script>
+
+var width = 960,
+    height = 500;
+
+var svg = d3.select("body").append("svg")
+    .attr("width", width)
+    .attr("height", height);
+
+var force = d3.layout.force()
+    .size([width, height]);
+
+d3.text("can_161.mtx", function(text) {
+  var graph = parseMtx(text);
+
+  var link = svg.selectAll(".link")
+      .data(graph.links)
+    .enter().append("line")
+      .attr("class", "link");
+
+  var node = svg.selectAll(".node")
+      .data(graph.nodes)
+    .enter().append("circle")
+      .attr("class", "node")
+      .attr("r", 4.5)
+      .call(force.drag);
+
+  force
+      .nodes(graph.nodes)
+      .links(graph.links)
+      .on("tick", tick)
+      .start();
+
+  function tick() {
+    link.attr("x1", function(d) { return d.source.x; })
+        .attr("y1", function(d) { return d.source.y; })
+        .attr("x2", function(d) { return d.target.x; })
+        .attr("y2", function(d) { return d.target.y; });
+
+    node.attr("cx", function(d) { return d.x; })
+        .attr("cy", function(d) { return d.y; });
+  }
+});
+
+function parseMtx(text) {
+  var nodes = [];
+
+  var links = text
+      .split(/\n/g) // split lines
+      .filter(function(d) { return d.charAt(0) != "%"; }) // skip comments
+      .slice(1, -1) // skip header line, last line
+      .map(function(d) {
+        d = d.split(/\s+/g);
+        var source = d[0] - 1, target = d[1] - 1;
+        return {
+          source: nodes[source] || (nodes[source] = {index: source}),
+          target: nodes[target] || (nodes[target] = {index: target})
+        };
+      });
+
+  return {
+    nodes: nodes,
+    links: links
+  };
+}
+
+</script>
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		The University of Florida [Sparse Matrix Collection](http://www.cise.ufl.edu/research/sparse/matrices/) provides a vast collection of interesting graphs in Matrix Market format. This example shows how to adapt this format to D3's force layout.
		This example demonstrates rendering a [D3](http://d3js.org) [force-directed graph](http://mbostock.github.com/d3/ex/force.html) using Canvas rather than SVG. The performance is slightly better than SVG, but unlike the SVG version, the nodes in this one are not draggable.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		The University of Florida [Sparse Matrix Collection](http://www.cise.ufl.edu/research/sparse/matrices/) provides a vast collection of interesting graphs in Matrix Market format. This example shows how to adapt this format to D3's force layout.