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series normalization per mouse-x (D3.js): https://bl.ocks.org/enthal/060290a72e8c29d9f160
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| svg .chart { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 2px; | |
| } | |
| svg rect.mouse { | |
| fill: none; | |
| pointer-events: all; | |
| } | |
| </style> | |
| <body></body> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.6/d3.min.js" charset="utf-8"></script> | |
| <script> | |
| var n=100, seriesList = []; | |
| pushSeries(function(i) { return Math.sin(i*Math.PI/(n*0.2))+2; }); | |
| pushSeries(function(i) { return Math.cos(i*Math.PI/(n*0.3))+2; }); | |
| pushSeries(function(i) { return Math.cos(i*Math.PI/(n*0.15))/2+3*i/n+2; }); | |
| pushSeries(function(i) { return Math.pow(i/n,1.8)+1; }); | |
| var width = 960, | |
| height = 500; | |
| var x = d3.scale.linear().range([0, width]); | |
| var y = d3.scale.linear().range([height, 0]); | |
| var series = seriesList[0]; | |
| x.domain([0, n]); | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var chart = svg.append('g').classed('chart', true); | |
| effectScaledPaths(0); | |
| svg.append("rect").classed("mouse", true) | |
| .attr("width", width) | |
| .attr("height", height) | |
| .on("mousemove", mousemove); | |
| // var lastX0; | |
| function pushSeries(fn) { | |
| var s = []; | |
| seriesList.push(s); | |
| for (var i=0;i<n;i++) { s.push(fn(i)); } | |
| } | |
| function mousemove() { | |
| effectScaledPaths(Math.floor(x.invert(d3.mouse(this)[0]))); // TODO: bisect when x domain isn't index? | |
| } | |
| function effectScaledPaths(x0) { | |
| /* | |
| Scale each series to be proportional to its value at x0, | |
| such that all series cross at some single point at mouse.x, | |
| setting y.domain to extent of extents of all so-scaled series (i.e., global max,min). | |
| */ | |
| var ss = seriesList.slice(); | |
| var extents = []; | |
| for (var ssi in ss) { | |
| var s = ss[ssi] = ss[ssi].slice(); | |
| var factor = 1.0 / s[x0]; // but nothing is proportional to a value of 0 | |
| for (var si in s) { | |
| s[si] *= factor; | |
| } | |
| extents.push(d3.extent(s)); | |
| } | |
| y.domain(d3.extent(d3.merge(extents))); | |
| var updateSel = chart.selectAll('path.series').data(ss); | |
| updateSel.enter().append('path').classed('series', true) | |
| updateSel | |
| .attr("stroke", d3.scale.category10()) | |
| .transition() | |
| .duration(70) | |
| .ease("linear") | |
| .attr('d', d3.svg.line() | |
| // .interpolate('basis') | |
| .x(function(d,i) { return x(i); }) | |
| .y(y) ); | |
| } | |
| </script> |
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