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"D3.js" Focus + Context Line chart

Source: Internet
Author: User
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Use D3.js Library to implement Focus+context line chart, read DATA.TSV file data

Index.html

<! DOCTYPE html><meta charset= "Utf-8" ><style>svg {font:10px sans-serif;}.  Axis Path,.axis line {fill:none;  Stroke: #000; Shape-rendering:crispedges;}.  line {fill:none;                            Clip-path:url (#clip);  Cutting off the stroke:steelblue in excess of the line segments beyond the coordinate system range; stroke-width:1.5px;}.  Brush. Extent {stroke: #fff;  Fill-opacity:. 125; Shape-rendering:crispedges;} </style><body><script src= "Https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js" ></ Script><script>var margin = {top:10, right:10, bottom:100, left:40}, margin2 = {top:430, right:10, Botto M:20, left:40}, Width = 960-margin.left-margin.right, height = 500-margin.top-margin.bottom, height2 =    500-margin2.top-margin2.bottom; var color = D3.scale.category10 (), var parsedate = D3.time.format ("%y%m%d"). Parse;var x = D3.time.scale (). Range ([0, Width ]), x2 = D3.time.scale (). Range ([0, Width]), y = D3.scale.linear (). Range ([height, 0]), y2 = D3.scale.linear (). Range ([height2, 0]), var xaxis = D3.svg.axis (). scale (X). Orient ("Bottom"), XAxis2 = D3.svg.axis (). SC    Ale (x2). Orient ("Bottom"), YAxis = D3.svg.axis (). scale (Y). Orient ("left");    var line = D3.svg.line (). Interpolate ("basis"). x (function (d) {return x (d.date);})    . Y (function (d) {return y (d.temperature);});    var line2 = D3.svg.line (). Interpolate ("basis"). x (function (d) {return x2 (d.date);}) . Y (function (d) {return y2 (d.temperature);}); var brush = D3.svg.brush (). x (x2). On ("brush", brushed), var svg = d3.select ("Body"). Append ("SVG"). attr ("width", Width + margin.left + margin.right). attr ("height", height + margin.top + margin.bottom); Svg.append ("Defs"). Append ("CLI Ppath "). attr (" id "," clip "). Append (" Rect "). attr (" width ", width). attr (" height ", height); var focus = Svg.append ("G"). attr ("Class", "Focus"). attr ("transform", "translate (" + Margin.left + "," + Margin.top + ")"); var context = Svg.append ("G"). attr ("Class "," context "). attr (" transform "," translate ("+ Margin2.left +", "+ Margin2.top +") ");d 3.tsv (" DATA.TSV ", Functi  On (error, data) {Color.domain (D3.keys (data[0]). Filter (function (key) {return key!== "date";}));  Data.foreach (function (d) {d.date = Parsedate (d.date);  }); var cities = Color.domain (). Map (function (name) {return {name:name, values:data.map (function (d) {R      Eturn {date:d.date, temperature: +d[name]};  })    };  });  X.domain (d3.extent (data, function (d) {return d.date;})); Y.domain ([D3.min (Cities, function (c) {return d3.min (c.values, function (v) {return v.temperature;});}), D3.max (c  Ities, function (c) {return D3.max (c.values, function (v) {return v.temperature;});})  ]);  X2.domain (X.domain ());     Y2.domain (Y.domain ());  var city = Focus.selectall ('. City '). Data (cities). Enter (). Append ("G"). attr ("Class", "City"); City.append ("path"). attr ("Class", "line"). attr ("D", function (d) {return line (d.values);  }). Style ("Stroke", function (d) {return color (d.name);});  Focus.append ("G"). attr ("Class", "X axis"). attr ("transform", "translate (0," + height + ")"). Call (Xaxis);              Focus.append ("G"). attr ("Class", "Y axis"). Call (YAxis);  var city2 = Context.selectall (". City"). Data (cities). Enter (). Append ("G"). attr ("Class", "City");      City2.append ("path"). attr ("Class", "line"). attr ("D", function (d) {return line2 (d.values);})  . Style ("Stroke", function (d) {return color (d.name);}); Context.append ("G"). attr ("Class", "X axis"). attr ("transform", "translate (0," + height2 + ")"). Call (Xaxis  2); Context.append ("G"). attr ("Class", "X Brush"). Call (Brush). SelectAll ("rect"). attr ("Y",-6). attr (  "Height", height2 + 7);  }); function brushed () {X.domain (Brush.empty ()? X2.domain (): Brush.extent ());  Focus.selectall (". Line"). attr ("D", function (d) {return line (d.values);}); Focus.select (". X.axis").Call (Xaxis);} </script>

As follows:



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"D3.js" Focus + Context Line chart

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