CS 725/825 - Spring 2018 - Homework 3 - Scatterplot
See the assignment instructions at http://www.cs.odu.edu/~mweigle/CS725-S18/HW3
Scatterplot of 2014 NCAA Passing Statistics
Data from http://www.sports-reference.com/cfb/years/2014-passing.html
Scatterplot based on /mbostock/3887118, tooltip example from http://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html
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<html>
<meta charset="utf-8">
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://d3js.org/d3-scale-chromatic.v1.min.js"></script> <!-- for color scales -->
<!-- Example based on https://bl.ocks.org/mbostock/3887118 -->
<!-- Tooltip example from https://www.d3noob.org/2013/01/adding-tooltips-to-d3js-graph.html -->
<style>
body { font-family: calibri; }
.axis { font: 14px calibri; }
.label {font: 16px calibri; }
.tooltip {
position: absolute;
width: 150px;
height: 60px;
background: #f2f2f2;
pointer-events: none;
}
</style>
<body>
<h2>Scatterplot</h2>
<div><svg id="chart1" width="700" height="412"></svg></div>
<script>
// add the graph canvas to the body of the webpage
var svg = d3.select("#chart1"),
margin = {top: 20, right: 20, bottom: 50, left: 70},
width = +svg.attr("width") - margin.left - margin.right,
height = +svg.attr("height") - margin.top - margin.bottom;
var g = svg.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
// add the tooltip area to the webpage
var tooltip = d3.select("body").append("div")
.attr("class", "tooltip")
.style("opacity", 0);
// load data
d3.tsv("data.tsv", function (d) {
// change string (from CSV) into number format
d["TW"] = +d["TW"];
d["MW"] = +d["MW"];
return d;
}, function(error, data) {
if (error) throw error;
/*
* value accessor - returns the value to encode for a given data object.
* scale - maps value to a visual display encoding, such as a pixel position.
* map function - maps from data value to display value
*/
// setup x
var xValue = function(d) { return d["TW"];}, // data -> value
xScale = d3.scaleLinear().range([0, width]), // value -> display
xMap = function(d) { return xScale(xValue(d));}; // data -> display
// setup y
var yValue = function(d) { return d["MW"];}, // data -> value
yScale = d3.scaleLinear().range([height, 0]), // value -> display
yMap = function(d) { return yScale(yValue(d));}; // data -> display
// don't want dots overlapping axis, so add in buffer to data domain
xScale.domain([d3.min(data, xValue)-1, d3.max(data, xValue)+1]);
yScale.domain([0, d3.max(data, yValue)+1]);
// x-axis
g.append("g")
.attr("class", "axis x-axis")
.attr("transform", "translate(0," + height + ")") // move axis to bottom of chart
.call(d3.axisBottom(xScale));
// x-axis label
g.append("text")
.attr("class", "label")
.attr("x", width/2)
.attr("y", height+(margin.bottom*0.75))
.style("text-anchor", "middle")
.style("font-weight", "bold")
.style("font-size", "22px")
.text("Toss won")
.style("fill","Teal");
// y-axis
g.append("g")
.attr("class", "axis y-axis")
.call(d3.axisLeft(yScale));
// y-axis label
g.append("text")
.attr("class", "label")
.attr("x", 0-(height/2))
.attr("y", 0-(margin.left*0.55))
.attr("transform", "rotate(-90)") // rotate text -90 degrees from x, y
.style("text-anchor", "middle")
.style("font-weight", "bold")
.style("font-size", "22px")
.text("Matches won")
.style("fill","Teal");
// draw dots
g.selectAll(".dot")
.data(data)
.enter().append("circle")
.attr("class", "dot")
.attr("r", 3.5)
.attr("cx", xMap)
.attr("cy", yMap)
.style("fill","teal")
// tooltip
.on("mouseover", function(d) {
tooltip.transition()
.duration(200) // ms delay before appearing
.style("opacity", .8); // tooltip appears on mouseover
tooltip.html(d["Team"] + "<br/> " + "<br/>(" + xValue(d)
+ ", " + yValue(d) + ")")
.style("left", (d3.event.pageX + 10) + "px") // specify x location
.style("top", (d3.event.pageY - 28) + "px"); // specify y location
})
.on("mouseout", function(d) {
tooltip.transition()
.duration(500)
.style("opacity", 0); // disappear on mouseout
});
});
</script>
</body>
</html>
https://d3js.org/d3.v4.min.js
https://d3js.org/d3-scale-chromatic.v1.min.js