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function generateData(){
var testdata = stream_layers(7,10+Math.random()*100,.1).map(function(data, i) {
return {
key: 'Stream' + i,
values: data.map(function(a){a.y = a.y * (i <= 1 ? -1 : 1); return a})
};
});
testdata[0].type = "area"
testdata[0].yAxis = 1
testdata[1].type = "area"
testdata[1].yAxis = 1
testdata[2].type = "line"
testdata[2].yAxis = 1
testdata[3].type = "line"
testdata[3].yAxis = 2
testdata[4].type = "bar"
testdata[4].yAxis = 2
testdata[5].type = "bar"
testdata[5].yAxis = 2
testdata[6].type = "bar"
testdata[6].yAxis = 2
return testdata;
}
/* Inspired by Lee Byron's test data generator. */
function stream_layers(n, m, o) {
if (arguments.length < 3) o = 0;
function bump(a) {
var x = 1 / (.1 + Math.random()),
y = 2 * Math.random() - .5,
z = 10 / (.1 + Math.random());
for (var i = 0; i < m; i++) {
var w = (i / m - y) * z;
a[i] += x * Math.exp(-w * w);
}
}
return d3.range(n).map(function() {
var a = [], i;
for (i = 0; i < m; i++) a[i] = o + o * Math.random();
for (i = 0; i < 5; i++) bump(a);
return a.map(stream_index);
});
}
function stream_index(d, i) {
return {x: i, y: Math.max(0, d)};
} |
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