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2-speed Revolving Bar
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8" /> | |
| <title>2-speed Revolving Bar</title> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <link rel="stylesheet" type="text/css" href="revolving_bar.css"> | |
| </head> | |
| <body> | |
| <div id="topline"> | |
| <p>Click the background to run</p> | |
| </div> | |
| <script> | |
| var w = 960, h = 500; | |
| var angle_data = []; | |
| var i, n = 0, limit = 360; | |
| var steps = [0.3, 0.1] | |
| while ( n < limit) { | |
| n < 120 || n > 240 ? n += steps[0] : n += steps[1] | |
| angle_data.push(n); | |
| } | |
| var svg = d3.select("body").append("svg") | |
| .attr("width", w) | |
| .attr("height", h) | |
| svg.append("rect") | |
| .attr("id", "background") | |
| .attr("x", "1") | |
| .attr("y", "1") | |
| .attr("width", w -3) | |
| .attr("height", h - 3) | |
| var t = svg.append("text") | |
| .attr("id", "t") | |
| .attr("x", "30") | |
| .attr("y", "40") | |
| .text("Seconds") | |
| var t = svg.append("text") | |
| .attr("id", "th") | |
| .attr("x", "30") | |
| .attr("y", "60") | |
| .text("Degrees") | |
| var g1 = svg.append("g") | |
| .attr("transform", "translate(" + (w/2) + " " + (h/2) + ")") | |
| var circle = g1.append("circle") | |
| .attr("r", "140") | |
| .style("fill", "none"); | |
| var rect = g1.append("rect") | |
| .attr("id", "r1") | |
| .attr("x", "-140") | |
| .attr("y", -5) | |
| .attr("width", "280") | |
| .attr("height", "10") | |
| .attr("transform", "rotate(0)"); | |
| var run = function() { | |
| var tim = 8000; | |
| rect.transition() | |
| .delay(0) | |
| .ease("linear") | |
| .duration(tim) | |
| .attrTween("transform", function() { // was function(d, i) | |
| return function(t) { | |
| d3.select("#t") .text("Seconds: " + d3.round(tim/1000*t, 4)) | |
| var th = angle_data[d3.round(t * angle_data.length)]; | |
| isNaN(th) ? th = limit : th; | |
| d3.select("#th") .text("Degrees: " + d3.round(th, 2)); | |
| return "rotate("+ th +")"; | |
| }; | |
| } | |
| ); | |
| }; | |
| d3.select("#background") | |
| .on("click", function (){run()}) | |
| run(); | |
| </script> | |
| </body> | |
| </html> |
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| #r1, circle { | |
| fill: burlywood; | |
| stroke: saddlebrown | |
| } | |
| circle { | |
| fill: none; | |
| stroke: saddlebrown | |
| } | |
| #background{ | |
| stroke:navy; | |
| fill: aliceblue; | |
| } | |
| #t, #th { | |
| font: 11pt sans-serif; | |
| fill: #306; | |
| } | |
| #topline { | |
| font: 13pt sans-serif; | |
| color: #306; | |
| position: absolute; | |
| left: 380px; | |
| top: 20px; | |
| } |
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