Based on examples made by Scott Murray - alignedleft
- css fill transition
- assigning transitions by class of elements
- filtering data by assigning classes using .classed
- using .each with .select(this) to dynamically assign classes
Created
September 20, 2015 19:25
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bar chart transitions
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <title>D3: Smoothing out the highlights</title> | |
| <script type="text/javascript" src="d3.js"></script> | |
| <style type="text/css"> | |
| body { | |
| background-color: gray; | |
| } | |
| svg { | |
| background-color: white; | |
| } | |
| svg rect { | |
| fill: #3200ff; | |
| /* New transition rule sets speed of fill changes, | |
| such as when the "highlight" class is applied. */ | |
| transition: fill 0.7s ease-in; | |
| } | |
| svg rect.highlight { | |
| fill: #ff759a; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: black; | |
| shape-rendering: crispEdges; | |
| } | |
| .axis text { | |
| font-family: sans-serif; | |
| font-size: 11px; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script type="text/javascript"> | |
| //Width, height, padding | |
| var w = 600; | |
| var h = 250; | |
| var padding = 25; | |
| //Array of dummy data values | |
| var dataset = [ 23, 19, 22, 19, 21, 25, 22, 18, 15, 13, | |
| 3, 1, 5, 2, 18, 17, 21, 18, 23, 25 ]; | |
| //Configure x and y scale functions | |
| var xScale = d3.scale.ordinal() | |
| .domain(d3.range(dataset.length)) | |
| .rangeRoundBands([ padding, w - padding ], 0.05); | |
| var yScale = d3.scale.linear() | |
| .domain([ 0, d3.max(dataset) ]) | |
| .rangeRound([ h - padding, padding ]); | |
| //Configure y axis generator | |
| var yAxis = d3.svg.axis() | |
| .scale(yScale) | |
| .orient("left") | |
| .ticks(5); | |
| //Create SVG element | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", w) | |
| .attr("height", h); | |
| //Create bars | |
| var rects = svg.selectAll("rect") | |
| .data(dataset) | |
| .enter() | |
| .append("rect") | |
| .attr("x", function(d, i) { | |
| return xScale(i); | |
| }) | |
| .attr("y", function(d) { | |
| return h - padding; | |
| }) | |
| .attr("width", xScale.rangeBand()) | |
| .attr("height", 0); | |
| //Transition rects into place | |
| rects.transition() | |
| .delay(function(d, i) { | |
| return i * 100; | |
| }) | |
| .duration(1500) | |
| .attr("y", function(d) { | |
| return yScale(d); | |
| }) | |
| .attr("height", function(d) { | |
| return h - padding - yScale(d); | |
| }) | |
| .each("end", function(d) { | |
| d3.select(this) | |
| .classed("highlight", function(d) { | |
| if (d > 20) { | |
| return true; | |
| } | |
| return false; | |
| }); | |
| }); | |
| //Create y axis | |
| svg.append("g") | |
| .attr("class", "axis") | |
| .attr("transform", "translate(" + padding + ",0)") | |
| .attr("opacity", 0) | |
| .call(yAxis) | |
| .transition() | |
| .delay(2000) | |
| .duration(1500) | |
| .attr("opacity", 1.0); | |
| </script> | |
| </body> | |
| </html> |
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