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February 12, 2016 15:26
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Animate a random Lissajous Curve
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| <html> | |
| <body> | |
| <svg></svg> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.14/d3.min.js"></script> | |
| <script> | |
| var lineData = d3.range(1000); | |
| function get_rand() { | |
| return Math.round(Math.random()*9 + 0.5); | |
| } | |
| var a = get_rand(); | |
| var b = get_rand(); | |
| //This is the accessor function we talked about above | |
| function lineFunction(delta_x, delta_y) { | |
| return d3.svg.line() | |
| .x(function(d) { | |
| return 100*Math.cos(a*2*Math.PI*d/180 + delta_x) + 125; | |
| }) | |
| .y(function(d) { | |
| return 100*Math.sin(b*2*Math.PI*d/180 + delta_y) + 125; | |
| }) | |
| .interpolate("basis"); | |
| } | |
| function randomLineFunction(lineData) { | |
| return lineFunction(randomOdd(), randomOdd())(lineData); | |
| } | |
| //The SVG Container | |
| var svgContainer = d3.select("svg") | |
| .attr("width", 300) | |
| .attr("height", 300); | |
| //The line SVG Path we draw8 | |
| var curr_offset = 0.1; | |
| var lineGraph = svgContainer.append("path") | |
| .attr("d", lineFunction(curr_offset, 0)(lineData)) | |
| .attr("stroke", "blue") | |
| .attr("stroke-width", 2) | |
| .attr("fill", "none"); | |
| function updateCurve() { | |
| curr_offset += Math.PI/8; | |
| lineGraph | |
| .transition() | |
| .ease(d3.ease('linear')) | |
| .duration(500) | |
| .attr("d", lineFunction(curr_offset, 0)(lineData)); | |
| setTimeout(updateCurve, 500); | |
| } | |
| updateCurve(); | |
| </script> | |
| </body> | |
| </html> |
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