forked from adamhurst's block: 3D DNA Helix
Created
July 26, 2017 13:27
3D DNA Helix
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| license: mit |
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| <!DOCTYPE html> | |
| <html> | |
| <head lang="en"> | |
| <meta charset="UTF-8"> | |
| <title></title> | |
| </head> | |
| <body> | |
| <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js" charset="utf-8"></script> | |
| <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script> | |
| <script type="text/javascript"> | |
| var fills = ['#00779C', '#00465C', '#54B8B1', '#377874', '#455560', '#7C99AC', '#F5CC49', '#F5CC9C', '#A8353D', '#682126'], | |
| h = 150, | |
| w = 800, | |
| numX = 40, | |
| numY = 30, | |
| speed = 0.02, | |
| torsion = 0.2, | |
| x = d3.scale.linear().range([10, w - 10]), | |
| y = d3.scale.linear().range([h - 10, 10]), | |
| z = d3.scale.linear().range([10, 2]); | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| svg.append("rect") | |
| .attr("width", w) | |
| .attr("height", h) | |
| .attr("fill", "white") | |
| .on("mousemove", function () { torsion = 0.5 * d3.mouse(this)[0] / w; }); | |
| var container = svg.append("g"); | |
| var counter = 0; | |
| function generateData() { | |
| counter++; | |
| var data = d3.range(numX).map(function (d) { | |
| var t = d * torsion - speed * counter; | |
| return [ | |
| { | |
| x: d, | |
| y: Math.cos(t), | |
| z: Math.sin(t) | |
| }, | |
| { | |
| x: d, | |
| y: Math.cos(t - Math.PI), | |
| z: Math.sin(t - Math.PI) | |
| } | |
| ] | |
| }); | |
| var flat = _.flatten(data); | |
| x.domain(d3.extent(flat, function(d){ return d.x })); | |
| y.domain(d3.extent(flat, function(d){ return d.y })); | |
| z.domain(d3.extent(flat, function(d){ return d.z })); | |
| return data | |
| } | |
| function draw() { | |
| var cont = container.selectAll("g").data(generateData()); | |
| cont.exit().remove(); | |
| var enter = cont.enter() | |
| .append("g") | |
| .each(function (d, index) { | |
| d3.select(this) | |
| .selectAll("circle") | |
| .data(d) | |
| .enter() | |
| .append("circle") | |
| .attr("fill", "black"); | |
| d3.select(this).append('line') | |
| .attr("stroke", function (d, i) { return fills[index%7] }) | |
| .attr("stroke-width", 2) | |
| }); | |
| cont.each(function (d, index) { | |
| var inverted = (d[0].y < d[1].y) ? 1 : -1; | |
| d3.select(this) | |
| .selectAll("circle") | |
| .data(d) | |
| .attr("cx", function (d) { return x(d.x) }) | |
| .attr("cy", function (d) { return y(d.y) }) | |
| .attr("r", function (d) { return z(d.z) }) | |
| .attr("fill-opacity", function (d) { return z(d.z) / 10 }) | |
| .attr("fill", function (d, i) { return fills[index%7]; }); | |
| d3.select(this) | |
| .select('line') | |
| .attr("x2", x(d[0].x)) | |
| .attr("x1", x(d[0].x)) | |
| .attr("y2", y(d[0].y) - inverted * z(d[0].z)) | |
| .attr("y1", y(d[1].y) + inverted * z(d[1].z)) | |
| .attr("opacity", 0.3 * inverted * (d[1].y - d[0].y)) | |
| }) | |
| } | |
| setInterval(draw, 25); | |
| </script> | |
| </body> | |
| </html> |
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