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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <style> | |
| svg { | |
| float: left; | |
| border: solid 1px #aaa; | |
| } | |
| </style> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| <body> | |
| <script> | |
| var width = 238, | |
| height = 123, | |
| radius = 20; | |
| var drag = d3.behavior.drag() | |
| .origin(Object) | |
| .on("drag", dragmove); | |
| var svg = d3.select("body").selectAll("svg") | |
| .data(d3.range(16).map(function() { return {x: width / 2, y: height / 2}; })) | |
| .enter().append("svg") | |
| .attr("width", width) | |
| .attr("height", height); | |
| svg.append("circle") | |
| .attr("r", radius) | |
| .attr("cx", function(d) { return d.x; }) | |
| .attr("cy", function(d) { return d.y; }) | |
| .call(drag); | |
| function dragmove(d) { | |
| d3.select(this) | |
| .attr("cx", d.x = Math.max(radius, Math.min(width - radius, d3.event.x))) | |
| .attr("cy", d.y = Math.max(radius, Math.min(height - radius, d3.event.y))); | |
| } | |
| </script> |
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