such force
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| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <head> | |
| <style> | |
| svg { | |
| width: 960px; | |
| height: 500px; | |
| } | |
| </style> | |
| <script src="http://d3js.org/d3.v3.min.js"></script> | |
| </head> | |
| <body> | |
| <svg></svg> | |
| <script> | |
| var svg = d3.select("svg"); | |
| var cx = 960/2; | |
| var cy = 500/2; | |
| var outr = 200; | |
| var outer = svg.append("circle") | |
| .attr({ | |
| cx: cx, | |
| cy: cy, | |
| r: outr, | |
| fill: "none", | |
| stroke: "#1B8600", | |
| "stroke-width": 4 | |
| }); | |
| var electron = svg.append("circle") | |
| .attr({ | |
| cx: cx + outr, | |
| cy: cy, | |
| r: 15, | |
| fill: "#067BA8" | |
| }); | |
| var drag = d3.behavior.drag() | |
| .on("drag", function() { | |
| var mx = d3.mouse(this)[0]; | |
| var my = d3.mouse(this)[1]; | |
| var omega = Math.atan2(mx - cx, my - cy); | |
| var nx = outr * Math.sin(omega); | |
| var ny = outr * Math.cos(omega); | |
| electron.attr({ | |
| cx: cx + nx, | |
| cy: cy + ny | |
| }) | |
| }) | |
| electron.call(drag); | |
| </script> | |
| </body> |
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