Created
January 19, 2016 14:58
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Emanating Circles
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <body> | |
| <div id="svg-div"></div> | |
| <script src="https://d3js.org/d3.v3.min.js"></script> | |
| <script> | |
| var DEG_TO_RADIAN = Math.PI / 180; // convert degrees to radian | |
| var minRadius = 100; | |
| var maxRadius = 340; | |
| var degrees = [0, 15, 30, 45, 60, 75]; | |
| var radius = new Array(6); | |
| var svg = d3.select("#svg-div") | |
| .append("svg") | |
| .attr("width", 800) | |
| .attr("height", 800) | |
| var g = svg.append("g") | |
| .attr("transform", "translate(400, 400)"); | |
| function incrementArray(){ | |
| degrees.forEach(function(d, i){ | |
| degrees[i] = (degrees[i] + 1) % 90; | |
| var radian = degrees[i] * DEG_TO_RADIAN; | |
| var sine = Math.sin(radian); | |
| radius[i] = Math.round(minRadius + sine * (maxRadius-minRadius)) | |
| }); | |
| // console.log("Radius = " + radius.join(", ")) | |
| // ----------------------------------- | |
| // show what the output looks like | |
| var circles = g.selectAll("circle") | |
| .data(radius) | |
| circles | |
| .enter().append("circle") | |
| circles | |
| .attr("r", Number) | |
| .style("fill", "none") | |
| .style("stroke", "#aaa") | |
| circles.exit().remove(); | |
| } | |
| setInterval(incrementArray, 50) | |
| </script> | |
| </body> | |
| </html> |
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