Created
April 1, 2012 06:17
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just another inlet to tributary
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var start = Date.now() | |
, n = 6 //number of rings | |
, radius = 70 //radius interval | |
, deg = 360 //angle (in degrees) we will split | |
, width = 21 //width of each box | |
, t = 1337 //"time' | |
, a = 1 | |
, ntheta = 2 | |
, speed_factor = 0.02917 | |
, opacity = 0.01 | |
, stroke_opacity = 0.9 | |
, stroke_width = 2 | |
, fill_color = "#000000" | |
, stroke_colors = ["#ffffff", "#000000"] | |
, corners = 0 | |
var sw = parseInt(d3.select("svg").style("width")) | |
//make the sin waves extend past the width a little | |
sw += .1 * sw | |
var sh = parseInt(d3.select("svg").style("height")) | |
var rings = [ ]; | |
for (i in d3.range(n)) | |
{ | |
var speed = i * speed_factor | |
rings.push({ | |
radius: radius*i, | |
width: width, | |
speed: speed, | |
phase: i | |
}) | |
} | |
var svg = d3.select("svg") | |
svg.append("rect") | |
.attr("width", sw) | |
.attr("height", sh) | |
.attr("fill", "#888888") | |
svg = svg.append("svg:g") | |
.attr("transform", "translate(" + sw / 2 + "," + sh / 2 + ")scale(.6)"); | |
var ring = svg.selectAll("g") | |
.data(rings) | |
.enter().append("svg:g") | |
.attr("class", "ring") | |
.each(ringEnter); | |
var updateRing = function(elapsed) { | |
rotate = function(d,i) { | |
return "rotate(" + (a * d.speed * elapsed) + ")"; | |
}; | |
var rings = svg.selectAll("g.ring") | |
.attr("transform", rotate) | |
.selectAll("rect") | |
.attr("transform", rotate) | |
.attr("fill", fill_color) | |
.attr("fill-opacity", opacity) | |
.attr("stroke", function(d,i) { | |
return stroke_colors[i % 2]; | |
}) | |
.attr("stroke-opacity", stroke_opacity) | |
.attr("stroke-width", stroke_width) | |
.attr("rx", corners) | |
.attr("ry", corners) | |
} | |
function ringEnter(d, i) { | |
//split up the circle into squares | |
var theta = Math.floor(ntheta * Math.PI * d.radius / d.width * Math.SQRT1_2), | |
k = deg / theta; | |
d3.select(this).selectAll("g") | |
.data(d3.range(theta).map(function() { return d; })) | |
.enter().append("svg:g") | |
.attr("class", "square") | |
.attr("transform", function(_, i) { return "rotate(" + i * k + ")translate(" + d.radius + ")"; }) | |
.append("svg:rect") | |
.attr("x", -d.width / 2) | |
.attr("y", -d.width / 2) | |
.attr("width", d.width) | |
.attr("height", d.width); | |
} | |
updateRing(t) |
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