Every second, draws a black triangle made of the coordinates on the clock of the current second, minute and hour. Previous triangles are displayed in white.
After one hour, all trinagles are deleted.
Last active
March 11, 2018 19:30
-
-
Save pvernier/0d7b6a757ef8c47635be06796fc60fb7 to your computer and use it in GitHub Desktop.
Triangle clock
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| license: gpl-3.0 |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <style type="text/css"> | |
| svg { | |
| background-color: #bdbdbd; | |
| width: 500px; | |
| height: 500px; | |
| } | |
| circle { | |
| fill: #f0f0f0; | |
| } | |
| path { | |
| fill: none; | |
| stroke: black; | |
| stroke-width: 1.5; | |
| } | |
| path.old { | |
| stroke: white; | |
| stroke-width: 0.5; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <svg></svg> | |
| </body> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="https://d3js.org/d3-timer.v1.min.js"></script> | |
| <script type="text/javascript"> | |
| var svg = d3.select("svg") | |
| // Create the clock | |
| var items = 60; | |
| var x0 = 250; | |
| var y0 = 250; | |
| var r = 240 | |
| for(var i = 0; i < items; i++) { | |
| var x = x0 + r * Math.cos(2 * Math.PI * i / items); | |
| var y = y0 + r * Math.sin(2 * Math.PI * i / items); | |
| if (i < 45) { | |
| var id = i + 15 | |
| } else { | |
| var id = i % 45 | |
| } | |
| var circle = svg.append("circle") | |
| .attr("cx", x) | |
| .attr("cy", y) | |
| .attr("id", "c_" + id) | |
| .attr("r", 1) | |
| } | |
| var lineGenerator = d3.line(); | |
| var i = 1; | |
| var t = d3.interval(function(elapsed) { | |
| d3.selectAll('path') | |
| .classed('old', true) | |
| // Check the current time | |
| var current_time = new Date() | |
| // Get the current second, minute, hour | |
| var second = d3.select("circle#c_" + current_time.getSeconds()) | |
| var minute = d3.select("circle#c_" + current_time.getMinutes()) | |
| var hour = d3.select("circle#c_" + current_time.getHours() %12 * 5) | |
| var coordinates = [ | |
| [second.attr('cx'), second.attr('cy')], | |
| [minute.attr('cx'), minute.attr('cy')], | |
| [hour.attr('cx'), hour.attr('cy')], | |
| [second.attr('cx'), second.attr('cy')] | |
| ] | |
| var path_current_time = lineGenerator(coordinates); | |
| d3.select('svg') | |
| .append('path') | |
| .attr('d', path_current_time); | |
| i = i + 1 | |
| // Remove all paths after one hour | |
| if (i == 3601) { | |
| d3.selectAll('path').remove() | |
| i = 1 | |
| } | |
| }, 1000); // Every second | |
| </script> | |
| </html> |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment