An example of applying a scale transition to an entire SVG area, giving the impression of the graph growing into its final state.
Created
December 8, 2012 09:31
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Visualisation Exploration: D3: SVG transition
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| // mock up some some test data | |
| data = [ | |
| { year: 2002, average: 100 }, | |
| { year: 2003, average: 50 }, | |
| { year: 2004, average: 74 }, | |
| { year: 2005, average: 72 }, | |
| { year: 2006, average: 68 }, | |
| { year: 2007, average: 20 }, | |
| { year: 2008, average: 24 }, | |
| { year: 2009, average: 5 }, | |
| { year: 2010, average: 12 }, | |
| { year: 2011, average: 90 }, | |
| { year: 2012, average: 90 } | |
| ]; | |
| // stackflow example didn't specify height, width, margin x, y - so make some assumptions | |
| height = 400; | |
| width = 400; | |
| margin = { left: 5, right: 5, top: 5, bottom: 5 }; | |
| x = d3.scale.linear() | |
| .domain([2002, 2012]) | |
| .range([0,400]); | |
| y = d3.scale.linear() | |
| .domain([0,100]) | |
| .range([0, 400]); |
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| // Create the area element for each object - a function that will be passed to "path" | |
| var area = d3.svg.area() | |
| .x(function(d) { return x(d.year); }) | |
| .y0(height) | |
| .y1(function(d) { return y(d.average); }); | |
| var svg = d3.select("#co2").append("svg") | |
| .attr("width", width + margin.left + margin.right) | |
| .attr("height", height + margin.top + margin.bottom) | |
| .append("g") | |
| .attr("transform", "translate(" + margin.left, "," + margin.top + ")") | |
| // define a new 'g' to scope the transition, and keep separate from the margin adjusting transform above | |
| .append("g"); | |
| // apply the scale transform to the entire svg DOM element | |
| // note: (0,0) in SVG is top-left, so also need to rebase the bottom of the graph during the transition | |
| svg | |
| .attr("transform", "translate(0," + height + ") scale(1, 0)") | |
| .transition().duration(2000) | |
| .attr("transform", "translate(0,0) scale(1, 1)"); | |
| svg.append("path") | |
| // pull in data to the path | |
| .datum(data) | |
| .attr("class", "area") | |
| // passing in the area function, for each object | |
| .attr("d", area) | |
| .style("fill-opacity", "1"); |
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| <html> | |
| <head> | |
| <title>D3 Path Transition</title> | |
| <script src="http://d3js.org/d3.v2.min.js"></script> | |
| </head> | |
| <body> | |
| <h1>Vis Exploration - D3 - SVG Transition<h1> | |
| <div id="co2"></div> | |
| </body> | |
| <script src="assumptions.js"></script> | |
| <script src="example.js"></script> | |
| </html> |
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