A variation of a polar clock, inspired by a Flash screensaver by pixelbreaker.
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October 30, 2022 16:09
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Polar Clock II
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| license: gpl-3.0 | |
| height: 960 |
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| body { | |
| background: #222; | |
| margin: auto; | |
| width: 960px; | |
| } | |
| .tracks { | |
| fill: none; | |
| stroke: #000; | |
| stroke-width: 1.5px; | |
| } | |
| .bodies path { | |
| stroke: #000; | |
| stroke-width: 1.5px; | |
| } | |
| .bodies .text-path { | |
| stroke: none; | |
| } | |
| .bodies text { | |
| fill: #000; | |
| font: 500 16px "Helvetica Neue"; | |
| } | |
| </style> | |
| <svg width="960" height="960"></svg> | |
| <script src="//d3js.org/d3.v4.0.0-alpha.21.min.js"></script> | |
| <script> | |
| var svg = d3.select("svg"), | |
| width = +svg.attr("width"), | |
| height = +svg.attr("height"), | |
| radius = Math.min(width, height) / 1.9, | |
| bodyRadius = radius / 23, | |
| dotRadius = bodyRadius - 8; | |
| var pi = Math.PI; | |
| var fields = [ | |
| {radius: 0.2 * radius, format: d3.timeFormat("%B"), interval: d3.timeYear}, | |
| {radius: 0.3 * radius, format: formatDate, interval: d3.timeMonth}, | |
| {radius: 0.4 * radius, format: d3.timeFormat("%A"), interval: d3.timeWeek}, | |
| {radius: 0.6 * radius, format: d3.timeFormat("%-H hours"), interval: d3.timeDay}, | |
| {radius: 0.7 * radius, format: d3.timeFormat("%-M minutes"), interval: d3.timeHour}, | |
| {radius: 0.8 * radius, format: d3.timeFormat("%-S seconds"), interval: d3.timeMinute} | |
| ]; | |
| var color = d3.scaleRainbow() | |
| .domain([0, 360]); | |
| var arcBody = d3.arc() | |
| .startAngle(function(d) { return bodyRadius / d.radius; }) | |
| .endAngle(function(d) { return -pi - bodyRadius / d.radius; }) | |
| .innerRadius(function(d) { return d.radius - bodyRadius; }) | |
| .outerRadius(function(d) { return d.radius + bodyRadius; }) | |
| .cornerRadius(bodyRadius); | |
| var arcTextPath = d3.arc() | |
| .startAngle(function(d) { return -bodyRadius / d.radius; }) | |
| .endAngle(-pi) | |
| .innerRadius(function(d) { return d.radius; }) | |
| .outerRadius(function(d) { return d.radius; }); | |
| var g = svg.append("g") | |
| .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")"); | |
| g.append("g") | |
| .attr("class", "tracks") | |
| .selectAll("circle") | |
| .data(fields) | |
| .enter().append("circle") | |
| .attr("r", function(d) { return d.radius; }); | |
| var body = g.append("g") | |
| .attr("class", "bodies") | |
| .selectAll("g") | |
| .data(fields) | |
| .enter().append("g"); | |
| body.append("path") | |
| .attr("d", function(d) { | |
| return arcBody(d) | |
| + "M0," + (dotRadius - d.radius) | |
| + "a" + dotRadius + "," + dotRadius + " 0 0,1 0," + -dotRadius * 2 | |
| + "a" + dotRadius + "," + dotRadius + " 0 0,1 0," + dotRadius * 2; | |
| }); | |
| body.append("path") | |
| .attr("class", "text-path") | |
| .attr("id", function(d, i) { return "body-text-path-" + i; }) | |
| .attr("d", arcTextPath); | |
| var bodyText = body.append("text") | |
| .attr("dy", ".35em") | |
| .append("textPath") | |
| .attr("xlink:href", function(d, i) { return "#body-text-path-" + i; }); | |
| tick(); | |
| d3.timer(tick); | |
| function tick() { | |
| var now = Date.now(); | |
| fields.forEach(function(d) { | |
| var start = d.interval(now), | |
| end = d.interval.offset(start, 1); | |
| d.angle = Math.round((now - start) / (end - start) * 360 * 100) / 100; | |
| }); | |
| body | |
| .style("fill", function(d) { return color(d.angle); }) | |
| .attr("transform", function(d) { return "rotate(" + d.angle + ")"; }); | |
| bodyText | |
| .attr("startOffset", function(d, i) { return d.angle <= 90 || d.angle > 270 ? "100%" : "0%"; }) | |
| .attr("text-anchor", function(d, i) { return d.angle <= 90 || d.angle > 270 ? "end" : "start"; }) | |
| .text(function(d) { return d.format(now); }); | |
| } | |
| function formatDate(d) { | |
| d = new Date(d).getDate(); | |
| switch (10 <= d && d <= 19 ? 10 : d % 10) { | |
| case 1: d += "st"; break; | |
| case 2: d += "nd"; break; | |
| case 3: d += "rd"; break; | |
| default: d += "th"; break; | |
| } | |
| return d; | |
| } | |
| </script> |
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