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ordinal-test.js
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require("../env");
var vows = require("vows"),
assert = require("assert");
var suite = vows.describe("d3.scale.ordinal");
suite.addBatch({
"ordinal": {
topic: function() {
return d3.scale.ordinal;
},
"domain": {
"defaults to the empty array": function(ordinal) {
assert.isEmpty(ordinal().domain());
},
"new input values are added to the domain": function(ordinal) {
var x = ordinal().range(["foo", "bar"]);
assert.equal(x(0), "foo");
assert.deepEqual(x.domain(), ["0"]);
assert.equal(x(1), "bar");
assert.deepEqual(x.domain(), ["0", "1"]);
assert.equal(x(0), "foo");
assert.deepEqual(x.domain(), ["0", "1"]);
},
"setting the domain forgets previous values": function(ordinal) {
var x = ordinal().range(["foo", "bar"]);
assert.equal(x(1), "foo");
assert.equal(x(0), "bar");
assert.deepEqual(x.domain(), [1, 0]);
x.domain(["0", "1"]);
assert.equal(x(0), "foo"); // it changed!
assert.equal(x(1), "bar");
assert.deepEqual(x.domain(), ["0", "1"]);
},
"uniqueness is based on string coercion": function(ordinal) {
var x = ordinal().domain(["foo"]).range([42, 43, 44]);
assert.equal(x(new String("foo")), 42);
assert.equal(x({toString: function() { return "foo"; }}), 42);
assert.equal(x({toString: function() { return "bar"; }}), 43);
},
"orders domain values by the order in which they are seen": function(ordinal) {
var x = ordinal();
x("foo");
x("bar");
x("baz");
assert.deepEqual(x.domain(), ["foo", "bar", "baz"]);
x.domain(["baz", "bar"]);
x("foo");
assert.deepEqual(x.domain(), ["baz", "bar", "foo"]);
x.domain(["baz", "foo"]);
assert.deepEqual(x.domain(), ["baz", "foo"]);
x.domain([]);
x("foo");
x("bar");
assert.deepEqual(x.domain(), ["foo", "bar"]);
},
"does not coerce domain values to strings": function(ordinal) {
var x = ordinal().domain([0, 1]);
assert.deepEqual(x.domain(), [0, 1]);
assert.typeOf(x.domain()[0], "number");
assert.typeOf(x.domain()[1], "number");
},
"does not barf on object built-ins": function(ordinal) {
var x = ordinal().domain(["__proto__", "hasOwnProperty"]).range([42, 43]);
assert.equal(x("__proto__"), 42);
assert.equal(x("hasOwnProperty"), 43);
assert.deepEqual(x.domain(), ["__proto__", "hasOwnProperty"]);
}
},
"range": {
"defaults to the empty array": function(ordinal) {
var x = ordinal();
assert.isEmpty(x.range());
assert.isUndefined(x(0));
},
"setting the range remembers previous values": function(ordinal) {
var x = ordinal();
assert.isUndefined(x(0));
assert.isUndefined(x(1));
x.range(["foo", "bar"]);
assert.equal(x(0), "foo");
assert.equal(x(1), "bar");
},
"recycles values when exhausted": function(ordinal) {
var x = ordinal().range(["a", "b", "c"]);
assert.equal(x(0), "a");
assert.equal(x(1), "b");
assert.equal(x(2), "c");
assert.equal(x(3), "a");
assert.equal(x(4), "b");
assert.equal(x(5), "c");
assert.equal(x(2), "c");
assert.equal(x(1), "b");
assert.equal(x(0), "a");
}
},
"maps distinct values to discrete values": function(ordinal) {
var x = ordinal().range(["a", "b", "c"]);
assert.equal(x(0), "a");
assert.equal(x("0"), "a");
assert.equal(x([0]), "a");
assert.equal(x(1), "b");
assert.equal(x(2.0), "c");
assert.equal(x(new Number(2)), "c");
},
"rangePoints": {
"computes discrete points in a continuous range": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangePoints([0, 120]);
assert.deepEqual(x.range(), [0, 60, 120]);
assert.equal(x.rangeBand(), 0);
var x = ordinal().domain(["a", "b", "c"]).rangePoints([0, 120], 1);
assert.deepEqual(x.range(), [20, 60, 100]);
assert.equal(x.rangeBand(), 0);
var x = ordinal().domain(["a", "b", "c"]).rangePoints([0, 120], 2);
assert.deepEqual(x.range(), [30, 60, 90]);
assert.equal(x.rangeBand(), 0);
},
"correctly handles singleton domains": function(ordinal) {
var x = ordinal().domain(["a"]).rangePoints([0, 120]);
assert.deepEqual(x.range(), [60]);
assert.equal(x.rangeBand(), 0);
},
"can be set to a descending range": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangePoints([120, 0]);
assert.deepEqual(x.range(), [120, 60,0]);
assert.equal(x.rangeBand(), 0);
var x = ordinal().domain(["a", "b", "c"]).rangePoints([120, 0], 1);
assert.deepEqual(x.range(), [100, 60, 20]);
assert.equal(x.rangeBand(), 0);
var x = ordinal().domain(["a", "b", "c"]).rangePoints([120, 0], 2);
assert.deepEqual(x.range(), [90, 60, 30]);
assert.equal(x.rangeBand(), 0);
}
},
"rangeBands": {
"computes discrete bands in a continuous range": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangeBands([0, 120]);
assert.deepEqual(x.range(), [0, 40, 80]);
assert.equal(x.rangeBand(), 40);
var x = ordinal().domain(["a", "b", "c"]).rangeBands([0, 120], .2);
assert.deepEqual(x.range(), [7.5, 45, 82.5]);
assert.equal(x.rangeBand(), 30);
},
"setting domain recomputes range bands": function(ordinal) {
var x = ordinal().rangeRoundBands([0, 100]).domain(["a", "b", "c"]);
assert.deepEqual(x.range(), [1, 34, 67]);
assert.equal(x.rangeBand(), 33);
x.domain(["a", "b", "c", "d"]);
assert.deepEqual(x.range(), [0, 25, 50, 75]);
assert.equal(x.rangeBand(), 25);
},
"can be set to a descending range": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangeBands([120, 0]);
assert.deepEqual(x.range(), [80, 40, 0]);
assert.equal(x.rangeBand(), 40);
var x = ordinal().domain(["a", "b", "c"]).rangeBands([120, 0], .2);
assert.deepEqual(x.range(), [82.5, 45, 7.5]);
assert.equal(x.rangeBand(), 30);
},
"can specify a different outer padding": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangeBands([120, 0], .2, .1);
assert.deepEqual(x.range(), [84, 44, 4]);
assert.equal(x.rangeBand(), 32);
var x = ordinal().domain(["a", "b", "c"]).rangeBands([120, 0], .2, 1);
assert.deepEqual(x.range(), [75, 50, 25]);
assert.equal(x.rangeBand(), 20);
}
},
"rangeRoundBands": {
"computes discrete rounded bands in a continuous range": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangeRoundBands([0, 100]);
assert.deepEqual(x.range(), [1, 34, 67]);
assert.equal(x.rangeBand(), 33);
var x = ordinal().domain(["a", "b", "c"]).rangeRoundBands([0, 100], .2);
assert.deepEqual(x.range(), [7, 38, 69]);
assert.equal(x.rangeBand(), 25);
},
"can be set to a descending range": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangeRoundBands([100, 0]);
assert.deepEqual(x.range(), [67, 34, 1]);
assert.equal(x.rangeBand(), 33);
var x = ordinal().domain(["a", "b", "c"]).rangeRoundBands([100, 0], .2);
assert.deepEqual(x.range(), [69, 38, 7]);
assert.equal(x.rangeBand(), 25);
},
"can specify a different outer padding": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangeRoundBands([120, 0], .2, .1);
assert.deepEqual(x.range(), [84, 44, 4]);
assert.equal(x.rangeBand(), 32);
var x = ordinal().domain(["a", "b", "c"]).rangeRoundBands([120, 0], .2, 1);
assert.deepEqual(x.range(), [75, 50, 25]);
assert.equal(x.rangeBand(), 20);
}
},
"rangeExtent": {
"returns the continuous range": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangePoints([20, 120]);
assert.deepEqual(x.rangeExtent(), [20, 120]);
var x = ordinal().domain(["a", "b", "c"]).rangeBands([10, 110]);
assert.deepEqual(x.rangeExtent(), [10, 110]);
var x = ordinal().domain(["a", "b", "c"]).rangeRoundBands([0, 100]);
assert.deepEqual(x.rangeExtent(), [0, 100]);
var x = ordinal().domain(["a", "b", "c"]).range([0, 20, 100]);
assert.deepEqual(x.rangeExtent(), [0, 100]);
},
"can handle descending ranges": function(ordinal) {
var x = ordinal().domain(["a", "b", "c"]).rangeBands([100, 0]);
assert.deepEqual(x.rangeExtent(), [0, 100]);
}
},
"copy": {
"changes to the domain are isolated": function(ordinal) {
var x = ordinal().range(["foo", "bar"]), y = x.copy();
x.domain([1, 2]);
assert.deepEqual(y.domain(), []);
assert.equal(x(1), "foo");
assert.equal(y(1), "foo");
y.domain([2, 3]);
assert.equal(x(2), "bar");
assert.equal(y(2), "foo");
assert.deepEqual(x.domain(), ["1", "2"]);
assert.deepEqual(y.domain(), ["2", "3"]);
},
"changes to the range are isolated": function(ordinal) {
var x = ordinal().range(["foo", "bar"]), y = x.copy();
x.range(["bar", "foo"]);
assert.equal(x(1), "bar");
assert.equal(y(1), "foo");
assert.deepEqual(y.range(), ["foo", "bar"]);
y.range(["foo", "baz"]);
assert.equal(x(2), "foo");
assert.equal(y(2), "baz");
assert.deepEqual(x.range(), ["bar", "foo"]);
assert.deepEqual(y.range(), ["foo", "baz"]);
},
"changes to the range type are isolated": function(ordinal) {
var x = ordinal().domain([0, 1]).rangeBands([0, 1], .2), y = x.copy();
x.rangePoints([1, 2]);
assert.inDelta(x(0), 1, 1e-6);
assert.inDelta(x(1), 2, 1e-6);
assert.inDelta(x.rangeBand(), 0, 1e-6);
assert.inDelta(y(0), 1/11, 1e-6);
assert.inDelta(y(1), 6/11, 1e-6);
assert.inDelta(y.rangeBand(), 4/11, 1e-6);
y.rangeBands([0, 1]);
assert.inDelta(x(0), 1, 1e-6);
assert.inDelta(x(1), 2, 1e-6);
assert.inDelta(x.rangeBand(), 0, 1e-6);
assert.inDelta(y(0), 0, 1e-6);
assert.inDelta(y(1), 1/2, 1e-6);
assert.inDelta(y.rangeBand(), 1/2, 1e-6);
}
}
}
});
suite.export(module);