ffmap-backend/html/zigzag.js
2012-06-06 01:19:31 +02:00

58 lines
1.1 KiB
JavaScript

function zigzag_amplitude(d) {
return d.amplitude;
}
function zigzag_len(d) {
return d.len;
}
function zigzag_angularFrequency(d) {
return d.angularFrequency;
}
d3.svg.zigzag = function() {
var amplitude = zigzag_amplitude,
len = zigzag_len,
angularFrequency = zigzag_angularFrequency;
function zigzag() {
var A = amplitude.apply(this, arguments),
l = len.apply(this, arguments),
ω = angularFrequency.apply(this, arguments) + 1;
start = -l/2;
end = l/2;
step = l/ω;
var s = "M" + start + ",0";
for (var i = 1; i<ω; i++)
s += "L" + (start + i*step) + "," + ((i%2)?A:-A);
s += "L" + end + ",0";
return s;
}
zigzag.amplitude = function(v) {
if (!arguments.length) return amplitude;
amplitude = d3.functor(v);
return zigzag;
};
zigzag.len = function(v) {
if (!arguments.length) return len;
len = d3.functor(v);
return zigzag;
};
zigzag.angularFrequency = function(v) {
if (!arguments.length) return angularFrequency;
angularFrequency = d3.functor(v);
return zigzag;
};
return zigzag;
};