An example of using nested svg elements to have different coordinate systems in the same visualization. In this case, we provide a histogram of random data that fills the width of the graph while keeping the title in a static size for easy reading.
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December 27, 2015 21:39
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D3 and Nested SVG Elements.
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| font: 10px sans-serif; | |
| background-color: black; | |
| } | |
| svg { | |
| background-color: #222; | |
| } | |
| .bars .one { | |
| fill: #aec7e8; | |
| opacity: 0.2; | |
| transition: opacity 0.5s; | |
| } | |
| svg:hover .bars .one { opacity: 1.0; } | |
| .bars .one:hover { | |
| fill: #78a4d8; | |
| } | |
| .axis { | |
| opacity: 0.2; | |
| transition: opacity 0.5s; | |
| } | |
| .axis path, | |
| .axis line { | |
| fill: none; | |
| stroke: #888; | |
| shape-rendering: crispEdges; | |
| } | |
| .axis text { | |
| fill: #888; | |
| } | |
| svg:hover .axis { opacity: 1.0; } | |
| .hover-title { | |
| pointer-events: none; | |
| opacity: 1.0; | |
| transition: opacity 0.5s; | |
| } | |
| svg:hover .hover-title { opacity: 0;} | |
| </style> | |
| </head> | |
| <body> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <script type="text/coffeescript" src="script.coffee"></script> | |
| <script src="http://coffeescript.org/extras/coffee-script.js"></script> | |
| </body> | |
| </html> |
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| margin = top: 0, right: 0, bottom: 0, left: 0 | |
| width = 960 - margin.right - margin.left | |
| height = 150 - margin.top - margin.bottom | |
| viewHeight = 100 | |
| x = d3.scale.linear() | |
| y = d3.scale.linear().range [height, 0] | |
| svg = d3.select('body').append('svg') | |
| .classed('container', true) | |
| .attr('width', '100%') | |
| .attr('height', height + margin.top + margin.bottom) | |
| randInt = (upper) -> Math.floor(Math.random() * upper) | |
| data = for int in [0..30] | |
| one: randInt 20 | |
| two: randInt 15 | |
| three: randInt 10 | |
| four: randInt 5 | |
| barWidth = Math.floor(width / data.length) - 1 | |
| x.range([0, 960]).domain [0, data.length] | |
| y.range([0, 100]).domain [0, 20] | |
| bar = svg.append('svg') | |
| .classed('bars', true) | |
| .attr('viewBox', '0 0 960 100') | |
| .attr('preserveAspectRatio', 'none') | |
| .selectAll('g') | |
| .data(data) | |
| .enter().append('g') | |
| .attr('transform', (d, i) -> "translate(#{x(i)},0)") | |
| bar.append('rect') | |
| .attr('class', 'one') | |
| .attr('x', 1) | |
| .attr('y', (d) -> y(d.one)) | |
| .attr('width', barWidth) | |
| .attr('height', (d) -> viewHeight - y(d.one)) | |
| hover = svg.append('g') | |
| .classed('hover-title', true) | |
| .attr('opacity', 1) | |
| hover.append('text') | |
| .attr('x', 10) | |
| .attr('y', height - 25) | |
| .text('Page Title') | |
| .style('font-size', 64) | |
| .style('stroke', 'black') | |
| .style('stroke-width', '5px') | |
| hover.append('text') | |
| .attr('x', 10) | |
| .attr('y', height - 25) | |
| .text('Page Title') | |
| .style('fill', '#fff') | |
| .style('font-size', 64) | |
| svg.on 'mouseenter', -> | |
| d3.selectAll('.hover-title').transition() | |
| .duration(500) | |
| .attr('opacity', 0) | |
| svg.on 'mouseleave', -> | |
| d3.selectAll('.hover-title').transition() | |
| .duration(500) | |
| .attr('opacity', 1) |
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