Responsive Visualizations: Basic Graph

Responsive Visualizations

https://www.safaribooksonline.com/blog/2014/02/17/building-responsible-visualizations-d3-js/

Open in separate window and resize the graph

<!DOCTYPE html>
<meta charset="utf-8">
<link href='https://fonts.googleapis.com/css?family=PT+Sans' rel='stylesheet' type='text/css'>
<link href='x_graph.css' rel='stylesheet' type='text/css'>
<script src="https://d3js.org/d3.v3.js"></script>
<body>
  <svg id="graph"></svg>
  <p>Resize me bellow 300x80</p>
<script>

var margin = 40,
    width = 960 - margin*2,
    height = 500 - margin*2;

var xScale = d3.time.scale()
    .range([0, width])
    .nice(d3.time.year);

var yScale = d3.scale.linear()
    .range([height, 0])
    .nice();

var xAxis = d3.svg.axis()
    .scale(xScale)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(yScale)
    .orient("left");

var line = d3.svg.line()
    .x(function(d) { return xScale(d.date); })
    .y(function(d) { return yScale(d.close); });

var graph = d3.select("#graph")
        .attr("width", width + margin*2)
        .attr("height", height + margin*2)
    .append("g")
        .attr("transform", "translate(" + margin + "," + margin + ")");

var plotData;
  
// Read data and render
d3.csv("x_amzn.csv", function(error, data) {
    plotData = data;
    
  	render(data);
    resize();
    
  	if (error) {
        console.error(error);
    }
});
    
// resize on win resize, Open in new tab to test
d3.select(window).on('resize', resize);

function render (data) {

data.forEach(function(d) {
        d.date = d3.time.format("%Y-%m-%d").parse(d.date);
        d.close = +d.close;
    });

// Update scale's domain for the new min, max
    xScale.domain(d3.extent(data, function(d) { return d.date; }));
    yScale.domain(d3.extent(data, function(d) { return d.close; }));

graph.append("g")
        .attr("class", "x axis")
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);

graph.append("g")
        .attr("class", "y axis")
        .call(yAxis)
        .append("text")
        .attr("transform", "rotate(-90)")
        .attr("y", 6)
        .attr("dy", ".71em")
        .style("text-anchor", "end")
        .text("Price ($)");

graph.append("path")
        .datum(data)
        .attr("class", "line")
        .attr("d", line);
    
    // Create first and last value point
    // Hide it. Use on low resolution.
    var firstRecord = data[data.length-1];
    var lastRecord =  data[0];

var first = graph.append("g")
        .attr("class", "first")
        .style("display", "none");

var last = graph.append("g")
        .attr("class", "last")
        .style("display", "none");

first.append("text")
        .attr("x", -8)
        .attr("y", 4)
        .attr("text-anchor", "end")
        .text("$" + firstRecord.close);
    first.append("circle")
        .attr("r", 4);

last.append("text")
        .attr("x", -8)
        .attr("y", 4)
        .attr("text-anchor", "start")
        .text("$" + lastRecord.close);
    last.append("circle")
        .attr("r", 4);

}

// Resize the plot
function resize() {
    
    var width = parseInt(d3.select("#graph").style("width")) - margin*2,
    height = parseInt(d3.select("#graph").style("height")) - margin*2;

xScale.range([0, width]).nice(d3.time.year);
    yScale.range([height, 0]).nice();

// Control the number of ticks. One tick per 50px. Minimum 2 ticks.
    yAxis.ticks(Math.max(height/50, 2));
    xAxis.ticks(Math.max(width/50, 2));

// Move x axis on the bottom of the graph (set y for the graph height)
    // Redraw the x axis after update
    graph.select('.x.axis')
        .attr("transform", "translate(0," + height + ")")
        .call(xAxis);

// Redraw the y axis after update
    graph.select('.y.axis')
        .call(yAxis);

// Redraw the line after axis update
    graph.selectAll('.line')
        .attr("d", line);
    
    // If graph is smaller than 80x300 will drop axis  
    if (width < 300 && height < 80) {
        graph.select('.x.axis').style("display", "none");
        graph.select('.y.axis').style("display", "none");
      
 				graph.select(".first")
        		.attr("transform", "translate(" + xScale(xScale.domain()[0]) + "," + yScale(firstRecord.close) + ")")
        		.style("display", "initial");

graph.select(".last")
        		.attr("transform", "translate(" + xScale(xScale.domain()[1]) + "," + yScale(lastRecord.close) + ")")
        		.style("display", "initial");
      
    } else {
        graph.select('.x.axis').style("display", "initial");
        graph.select('.y.axis').style("display", "initial");
    }

}

</script>

Modified http://d3js.org/d3.v3.js to a secure url

https://d3js.org/d3.v3.js