From f681b8334c833223a8e9c8b817747e4bf9e3716c Mon Sep 17 00:00:00 2001
From: Stephen Bannasch <stephen.bannasch@gmail.com>
Date: Thu, 8 Mar 2012 17:37:47 -0500
Subject: [PATCH] grapher: shift right when plotting past right edge

---
 lib/simple-graph.js | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/lib/simple-graph.js b/lib/simple-graph.js
index 88359cc..71af0c0 100644
--- a/lib/simple-graph.js
+++ b/lib/simple-graph.js
@@ -212,8 +212,8 @@ function simpleGraph(elem, data, options) {
         return d ? "#ccc" : "#666";
       },
 
-      fx = xScale.tickFormat(options.datacount),
-      fy = xScale.tickFormat(options.datacount);
+      fx = xScale.tickFormat(10),
+      fy = xScale.tickFormat(10);
 
       // Regenerate x-ticks…
       var gx = vis.selectAll("g.x")
@@ -568,8 +568,18 @@ function simpleGraph(elem, data, options) {
 
   graph.set_data = function(_) {
     if (!arguments.length) return data;
+    var domain = xScale.domain(),
+        xextent = domain[1] - domain[0],
+        shift = xextent * 0.8;
     graph.generateDataPoints(_);
-    graph.update();
+    if (points.length > domain[1]) {
+      domain[0] += shift;
+      domain[1] += shift;
+      xScale.domain(domain);
+      graph.redraw();
+    } else {
+      graph.update();
+    }
     return graph;
   };