d3noob · June 19, 2021 08:53 · Jun 19, 2021 · Jun 19, 2021
diff --git a/README.md b/README.md
@@ -2,6 +2,4 @@ This is a follow on from a simple line graph and is based on @mbostock's example
 
 It impliments a simple tooltip which I find particularly neat. This implimentation is designed as a simple example which will be built on to create a slightly more complex example. 
 
-This graph is part of the code samples for the update to the book [D3 Tips and Tricks](https://leanpub.com/d3-t-and-t-v6) to version 6 of d3.js.
-
-forked from <a href='http://bl.ocks.org/d3noob/'>d3noob</a>'s block: <a href='http://bl.ocks.org/d3noob/d5c24b5d2117aa6740244240a3633ac0'>Favorite tooltip (simple version) v7</a>
+This graph is part of the code samples for the update to the book [D3 Tips and Tricks](https://leanpub.com/d3-t-and-t-v7) to version 7 of d3.js.
diff --git a/.block b/.block
@@ -0,0 +1 @@
+license: mit
diff --git a/README.md b/README.md
@@ -0,0 +1,7 @@
+This is a follow on from a simple line graph and is based on @mbostock's example [here](http://bl.ocks.org/mbostock/02d893e3486c70c4475f). 
+
+It impliments a simple tooltip which I find particularly neat. This implimentation is designed as a simple example which will be built on to create a slightly more complex example. 
+
+This graph is part of the code samples for the update to the book [D3 Tips and Tricks](https://leanpub.com/d3-t-and-t-v6) to version 6 of d3.js.
+
+forked from <a href='http://bl.ocks.org/d3noob/'>d3noob</a>'s block: <a href='http://bl.ocks.org/d3noob/d5c24b5d2117aa6740244240a3633ac0'>Favorite tooltip (simple version) v7</a>
diff --git a/atad.csv b/atad.csv
@@ -0,0 +1,27 @@
+date,close
+26-Mar-12,606.98
+27-Mar-12,614.48
+28-Mar-12,617.62
+29-Mar-12,609.86
+30-Mar-12,599.55
+2-Apr-12,618.63
+3-Apr-12,629.32
+4-Apr-12,624.31
+5-Apr-12,633.68
+9-Apr-12,636.23
+10-Apr-12,628.44
+11-Apr-12,626.20
+12-Apr-12,622.77
+13-Apr-12,605.23
+16-Apr-12,580.13
+17-Apr-12,543.70
+18-Apr-12,443.34
+19-Apr-12,345.44
+20-Apr-12,234.98
+23-Apr-12,166.70
+24-Apr-12,130.28
+25-Apr-12,99.00
+26-Apr-12,89.70
+27-Apr-12,67.00
+30-Apr-12,53.98
+1-May-12,58.13
diff --git a/data.csv b/data.csv
@@ -0,0 +1,27 @@
+date,close
+1-May-12,58.13
+30-Apr-12,53.98
+27-Apr-12,67.00
+26-Apr-12,89.70
+25-Apr-12,99.00
+24-Apr-12,130.28
+23-Apr-12,166.70
+20-Apr-12,234.98
+19-Apr-12,345.44
+18-Apr-12,443.34
+17-Apr-12,543.70
+16-Apr-12,580.13
+13-Apr-12,605.23
+12-Apr-12,622.77
+11-Apr-12,626.20
+10-Apr-12,628.44
+9-Apr-12,636.23
+5-Apr-12,633.68
+4-Apr-12,624.31
+3-Apr-12,629.32
+2-Apr-12,618.63
+30-Mar-12,599.55
+29-Mar-12,609.86
+28-Mar-12,617.62
+27-Mar-12,614.48
+26-Mar-12,606.98
diff --git a/index.html b/index.html
@@ -0,0 +1,112 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<style> /* set the CSS */
+
+.line {
+  fill: none;
+  stroke: steelblue;
+  stroke-width: 2px;
+}
+
+</style>
+<body>
+
+<!-- load the d3.js library -->    	
+<script src="https://d3js.org/d3.v7.min.js"></script>
+<script>
+
+// set the dimensions and margins of the graph
+var margin = {top: 20, right: 20, bottom: 30, left: 50},
+    width = 960 - margin.left - margin.right,
+    height = 500 - margin.top - margin.bottom;
+
+// parse the date / time
+var parseTime = d3.timeParse("%d-%b-%y");
+    bisectDate = d3.bisector(function(d) { return d.date; }).left;
+
+// set the ranges
+var x = d3.scaleTime().range([0, width]);
+var y = d3.scaleLinear().range([height, 0]);
+
+// define the line
+var valueline = d3.line()
+    .x(function(d) { return x(d.date); })
+    .y(function(d) { return y(d.close); });
+
+// append the svg obgect to the body of the page
+// appends a 'group' element to 'svg'
+// moves the 'group' element to the top left margin
+var svg = d3.select("body").append("svg")
+    .attr("width", width + margin.left + margin.right)
+    .attr("height", height + margin.top + margin.bottom)
+  .append("g")
+    .attr("transform",
+          "translate(" + margin.left + "," + margin.top + ")");
+
+var lineSvg = svg.append("g");
+
+var focus = svg.append("g") 
+    .style("display", "none");
+
+// Get the data
+d3.csv("atad.csv").then(function(data) {
+
+  // format the data
+  data.forEach(function(d) {
+      d.date = parseTime(d.date);
+      d.close = +d.close;
+  });
+
+  // Scale the range of the data
+  x.domain(d3.extent(data, function(d) { return d.date; }));
+  y.domain([0, d3.max(data, function(d) { return d.close; })]);
+
+  // Add the valueline path.
+  lineSvg.append("path")
+      .data([data])
+      .attr("class", "line")
+      .attr("d", valueline);
+
+  // Add the X Axis
+  svg.append("g")
+      .attr("transform", "translate(0," + height + ")")
+      .call(d3.axisBottom(x));
+
+  // Add the Y Axis
+  svg.append("g")
+      .call(d3.axisLeft(y));
+
+  // append the circle at the intersection 
+  focus.append("circle")
+      .attr("class", "y")
+      .style("fill", "none")
+      .style("stroke", "blue")
+      .attr("r", 4);
+
+  // append the rectangle to capture mouse
+  svg.append("rect")
+      .attr("width", width)
+      .attr("height", height)
+      .style("fill", "none")
+      .style("pointer-events", "all")
+      .on("mouseover", function() { focus.style("display", null); })
+      .on("mouseout", function() { focus.style("display", "none"); })
+      .on("mousemove", mousemove);
+
+  function mousemove() {
+	  var x0 = x.invert(d3.pointer(event,this)[0]),
+		  i = bisectDate(data, x0, 1),
+		  d0 = data[i - 1],
+		  d1 = data[i],
+		  d = x0 - d0.date > d1.date - x0 ? d1 : d0;
+
+	focus.select("circle.y")
+	   .attr("transform",
+	         "translate(" + x(d.date) + "," +
+	                        y(d.close) + ")");
+	}
+
+});
+
+</script>
+</body>