Trying to find the simplest way to make an SVG graph. No features really, just drawing a graph when given some data for x & y axes, with minimal manipulation and code.
A Pen by Ville V. Vanninen on CodePen.
Created
July 23, 2015 19:41
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Trivial SVG graph
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| <svg id="example" class="graph" preserveaspectratio="none" width="200" height="100"><path class="line"/></svg> |
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| function graph (selector, data) { | |
| var svg = document.querySelector(selector); | |
| var line = svg.querySelector('.line'); | |
| var numOfPoints = data.x.length; | |
| var xmin = Math.min.apply(null, data.x); | |
| var xmax = Math.max.apply(null, data.x); | |
| var ymin = Math.min.apply(null, data.y); | |
| var ymax = Math.max.apply(null, data.y); | |
| var xrange = xmax - xmin; | |
| var yrange = ymax - ymin; | |
| var path = 'M' + xmin + ',' + ymin + ' '; | |
| for (var i = 0; i < numOfPoints; i++) { | |
| path += 'L' + data.x[i] + ',' + data.y[i] + ' '; | |
| }; | |
| path += 'L' + xmax + ',' + ymin + ' '; | |
| path += ' Z'; | |
| var viewBox = [xmin, ymin, xrange, yrange].join(' '); | |
| //transform coordinate system start from bottom left | |
| var transform = 'translate(0, '+(ymin*2+yrange)+') scale(1,-1)' | |
| svg.setAttribute('viewBox', viewBox); | |
| line.setAttribute('d', path); | |
| line.setAttribute('transform', transform); | |
| } | |
| var data = { | |
| x: [ | |
| 9211, | |
| 9221, | |
| 9231, | |
| 9241, | |
| 9251, | |
| 9261, | |
| 9271, | |
| 9281, | |
| 9291, | |
| ], | |
| y: [ | |
| 12.4, | |
| 11.6, | |
| 11.4, | |
| 0, | |
| -3, | |
| 9.1, | |
| 23.0, | |
| 10.6, | |
| 19.4 | |
| ] | |
| } | |
| graph('#example', data); |
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| /*a bit of a reset*/ | |
| body, | |
| html, | |
| .graph { | |
| display: block; | |
| width: 100%; | |
| height: 100%; | |
| margin: 0; | |
| } | |
| /*set a nice color*/ | |
| body { | |
| color: #666; | |
| } | |
| /*inherit color*/ | |
| .line { | |
| fill: currentColor; | |
| } |
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