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Moving circles
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| <html> | |
| <head></head> | |
| <body> | |
| <svg width="960" height="500"></svg> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/4.2.2/d3.min.js"></script> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script> | |
| <script src="index.js"></script> | |
| </body> | |
| </html> |
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| var svg = d3.select("svg"); | |
| var width = +svg.attr("width"); | |
| var height = +svg.attr("height"); | |
| var color = d3.scaleOrdinal(d3.schemeCategory10); | |
| var data = _.times(50, function () { | |
| return getRadius(); | |
| }); | |
| function drawGraph() { | |
| var circle = svg.selectAll("circle") | |
| .data(data); | |
| circle.exit().transition() | |
| .attr("r", 0) | |
| .remove(); | |
| circle.enter().append("circle") | |
| .attr("cx", function() { | |
| return getPos(width); | |
| }) | |
| .attr("cy", function() { | |
| return getPos(height); | |
| }) | |
| .attr("r", 0) | |
| .attr("fill",function(d,i){return color(i);}) | |
| .transition() | |
| .attr("r", function(d) { | |
| return d; | |
| }); | |
| circle.merge(circle) | |
| .transition() | |
| .duration(1000) | |
| .attr("r", function(d) {return d}) | |
| .attr("cx", function(d) { return getPos(width)}) | |
| .attr("cy", function(d) { return getPos(height)}) | |
| } | |
| window.setInterval(function() { | |
| var dice = _.random(1, 3); | |
| var newRadius = getRadius(); | |
| var index = _.random(0, data.length - 1); | |
| if (dice === 1) { | |
| data.push(newRadius); | |
| } else if (dice === 2) { | |
| data.splice(index, 1); | |
| } else if (dice === 3) { | |
| data[index] = newRadius; | |
| } | |
| drawGraph(); | |
| }, 1000); | |
| function getRadius() { | |
| return _.random(5, 15); | |
| } | |
| function getPos(upperLimit) { | |
| return _.random(10, upperLimit) | |
| } | |
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