1000 circles bouncing of the edge in random direction. I don't think this works well on slow machines. Inspired by ease()-y as Math.PI by @alignedleft
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October 18, 2015 18:21
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1000 circles moving and bouncing of edges
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> | |
| <style> | |
| body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; } | |
| #vis { width: 100%; height: 100%; } | |
| </style> | |
| </head> | |
| <body> | |
| <div id="vis"> | |
| </div> | |
| <script> | |
| var width = document.getElementById("vis").clientWidth; | |
| var height = document.getElementById("vis").clientHeight; | |
| var svg = d3.select("#vis").append("svg") | |
| .attr("width", width) | |
| .attr("height", height) | |
| move = function() { | |
| var newx; | |
| var newy; | |
| var rand = Math.random(); | |
| if (d3.select(this).attr("cx") == 0) { | |
| if (rand < 0.3333) { | |
| newx = width; | |
| newy = Math.random()*height; | |
| } | |
| else if (rand > 0.6666) { | |
| newx = Math.random()*width; | |
| newy = 0; | |
| } | |
| else { | |
| newx = Math.random()*width; | |
| newy = height; | |
| } | |
| }; | |
| if (d3.select(this).attr("cx") == width) { | |
| if (rand < 0.3333) { | |
| newx = 0; | |
| newy = Math.random()*height; | |
| } | |
| else if (rand > 0.6666) { | |
| newx = Math.random()*width; | |
| newy = 0; | |
| } | |
| else { | |
| newx = Math.random()*width; | |
| newy = height; | |
| }; | |
| }; | |
| if (d3.select(this).attr("cy") == 0) { | |
| if (rand < 0.3333) { | |
| newx = width*Math.random(); | |
| newy = height; | |
| } | |
| else if (rand > 0.6666) { | |
| newx = 0; | |
| newy = height*Math.random(); | |
| } | |
| else { | |
| newx = width; | |
| newy = height*Math.random(); | |
| }; | |
| }; | |
| if (d3.select(this).attr("cy") == height) { | |
| if (rand < 0.3333) { | |
| newx = width*Math.random(); | |
| newy = 0; | |
| } | |
| else if (rand > 0.6666) { | |
| newx = 0; | |
| newy = height*Math.random(); | |
| } | |
| else { | |
| newx = width; | |
| newy = height*Math.random(); | |
| }; | |
| }; | |
| d3.select(this) | |
| .transition() | |
| .duration(10000 + 20000*Math.random()) | |
| .ease("linear") | |
| .attr("cy", newy) | |
| .attr("cx", newx) | |
| .each("end", move) | |
| } | |
| var i; | |
| for (i = 1; i < 1000; i ++) { | |
| var circle = svg.append("circle") | |
| .attr("r", 2 + Math.random()*20) | |
| .style("fill", "#9a0b16") | |
| .style("opacity", 0.7); | |
| circle.transition() | |
| .delay(20*i) | |
| .duration(10) | |
| .attr("cy", 0) | |
| .attr("cx", width*Math.random()) | |
| .each("end", move); | |
| }; | |
| </script> | |
| </body> |
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