Simple analog clock.
Last active
January 4, 2025 03:38
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Analog Clock
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| <!DOCTYPE html> | |
| <html> | |
| <meta charset="utf-8"> | |
| <script src="http://d3js.org/d3.v3.min.js" charset="utf-8"></script> | |
| <style> | |
| svg { | |
| shape-rendering: geometricPrecision; | |
| } | |
| .frame { | |
| fill: none; | |
| stroke: #ddd; | |
| stroke-width: 2px; | |
| } | |
| .center { | |
| stroke: none; | |
| fill: red; | |
| } | |
| .hand { | |
| stroke: #111; | |
| } | |
| .hour { | |
| stroke-width: 10px; | |
| } | |
| .minute { | |
| stroke-width: 5px; | |
| } | |
| .second { | |
| stroke: red; | |
| stroke-width: 2px; | |
| } | |
| </style> | |
| <body> | |
| <script> | |
| var width = 960; | |
| var height = 500; | |
| var cx = width / 2.; | |
| var cy = height / 2.; | |
| var length = [100, 140, 180]; | |
| var svg = d3.select("body") | |
| .append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| var data = [ | |
| {name: "hour", x1: cx, y1: cy, x2: 0, y2: 0}, | |
| {name: "minute", x1: cx, y1: cy, x2: 0, y2: 0}, | |
| {name: "second", x1: cx, y1: cy, x2: 0, y2: 0}, | |
| ]; | |
| (function tick() { | |
| var date = new Date(); | |
| var h = date.getHours() % 12; | |
| var m = date.getMinutes(); | |
| var s = date.getSeconds(); | |
| var angles = [0, 0, s * Math.PI / 30.]; | |
| angles[1] = m * Math.PI / 30. + angles[2] / 60.; | |
| angles[0] = h * Math.PI / 6 + angles[1] / 12.; | |
| for (var i = 0; i < 3; ++i) { | |
| data[i].x2 = length[i] * Math.sin(angles[i]) + cx; | |
| data[i].y2 = -length[i] * Math.cos(angles[i]) + cy; | |
| } | |
| var hands = svg.selectAll("line") | |
| .data(data, function(d) { return d.name; }); | |
| hands.enter().append("line") | |
| .attr("class", function(d) { return "hand " + d.name; }) | |
| .attr("stroke-linecap", "round") | |
| .attr("x1", function(d) { return d.x1; }) | |
| .attr("y1", function(d) { return d.y1; }) | |
| hands | |
| .attr("x2", function(d) { return d.x2; }) | |
| .attr("y2", function(d) { return d.y2; }) | |
| setTimeout(tick, 1000); | |
| })(); | |
| svg.selectAll("circle") | |
| .data([{name: "frame", r: 200}, | |
| {name: "center", r: 10}], | |
| function(d) { return d.name; }) | |
| .enter().append("circle") | |
| .attr("class", function(d) { return d.name; }) | |
| .attr("r", function(d) { return d.r; }) | |
| .attr("cx", cx) | |
| .attr("cy", cy); | |
| </script> | |
| </body> | |
| </html> |
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