Use the general update pattern to make an area shape.
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September 7, 2017 11:19
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Area Update Pattern
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| license: gpl-3.0 |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <style> | |
| body { | |
| margin: 0; | |
| } | |
| .area { | |
| fill: steelblue; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://unpkg.com/d3-marcon@2.0.2/build/d3-marcon.min.js"></script> | |
| <script src="https://unpkg.com/jeezy@1.11.0/lib/jeezy.min.js"></script> | |
| <script> | |
| var m = d3.marcon().width(window.innerWidth).height(window.innerHeight); | |
| m.render(); | |
| var width = m.innerWidth(), height = m.innerHeight(), svg = m.svg(); | |
| var parseTime = d3.timeParse("%d-%b-%y"); | |
| var x = d3.scaleLinear() | |
| .rangeRound([0, width]) | |
| .domain([1, 100]); | |
| var y = d3.scaleLinear() | |
| .rangeRound([height, 0]) | |
| .domain([0, 100]); | |
| var area = d3.area() | |
| .x(function(d) { return x(d.day); }) | |
| .y1(function(d) { return y(d.value); }) | |
| .y0(y(0)) | |
| .curve(d3.curveCatmullRom.alpha(0.5)); | |
| drawChart(makeData()); | |
| d3.interval(function(){ | |
| drawChart(makeData()); | |
| }, 100); | |
| function drawChart(data){ | |
| var area_path = svg.selectAll(".area") | |
| .data([data], function(d, i){ return i; }); | |
| area_path | |
| .transition() | |
| .attr("d", area); | |
| area_path.enter().append("path") | |
| .attr("class", "area") | |
| .attr("d", area); | |
| } | |
| function makeData(){ | |
| var arr = []; | |
| var start = jz.num.randBetween(45, 55); | |
| for (var i = 1; i <= 100; i++){ | |
| arr.push({day: i, value: jz.num.randBetween(start, start + 20)}) | |
| } | |
| return arr; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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