drag the blue dot
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September 3, 2015 00:51
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electron
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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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