|
| 1 | +require("../env"); |
| 2 | +require("../../d3"); |
| 3 | + |
| 4 | +var vows = require("vows"), |
| 5 | + assert = require("assert"); |
| 6 | + |
| 7 | +var suite = vows.describe("d3.scale.quantize"); |
| 8 | + |
| 9 | +suite.addBatch({ |
| 10 | + "quantize": { |
| 11 | + topic: function() { |
| 12 | + return d3.scale.quantize; |
| 13 | + }, |
| 14 | + "has the default domain [0, 1]": function(quantize) { |
| 15 | + var x = quantize(); |
| 16 | + assert.deepEqual(x.domain(), [0, 1]); |
| 17 | + assert.equal(x(.25), 0); |
| 18 | + }, |
| 19 | + "has the default range [0, 1]": function(quantize) { |
| 20 | + var x = quantize(); |
| 21 | + assert.deepEqual(x.range(), [0, 1]); |
| 22 | + assert.equal(x(.75), 1); |
| 23 | + }, |
| 24 | + "maps a number to a discrete value in the range": function(quantize) { |
| 25 | + var x = quantize().range([0, 1, 2]); |
| 26 | + assert.equal(x(0), 0); |
| 27 | + assert.equal(x(.2), 0); |
| 28 | + assert.equal(x(.4), 1); |
| 29 | + assert.equal(x(.6), 1); |
| 30 | + assert.equal(x(.8), 2); |
| 31 | + assert.equal(x(1), 2); |
| 32 | + }, |
| 33 | + "coerces domain to numbers": function(quantize) { |
| 34 | + var x = quantize().domain(["0", "100"]); |
| 35 | + assert.strictEqual(x.domain()[0], 0); |
| 36 | + assert.strictEqual(x.domain()[1], 100); |
| 37 | + }, |
| 38 | + "only considers the extent of the domain": function(quantize) { |
| 39 | + var x = quantize().domain([-1, 0, 100]); |
| 40 | + assert.deepEqual(x.domain(), [-1, 100]); |
| 41 | + }, |
| 42 | + "clamps input values to the domain": function(quantize) { |
| 43 | + var a = {}, b = {}, c = {}, x = quantize().range([a, b, c]); |
| 44 | + assert.equal(x(-.5), a); |
| 45 | + assert.equal(x(1.5), c); |
| 46 | + }, |
| 47 | + "range cardinality determines the degree of quantization": function(quantize) { |
| 48 | + var x = quantize(); |
| 49 | + assert.inDelta(x.range(d3.range(0, 1.001, .001))(1/3), .333, 1e-6); |
| 50 | + assert.inDelta(x.range(d3.range(0, 1.01, .01))(1/3), .33, 1e-6); |
| 51 | + assert.inDelta(x.range(d3.range(0, 1.1, .1))(1/3), .3, 1e-6); |
| 52 | + assert.inDelta(x.range(d3.range(0, 1.2, .2))(1/3), .4, 1e-6); |
| 53 | + assert.inDelta(x.range(d3.range(0, 1.25, .25))(1/3), .25, 1e-6); |
| 54 | + assert.inDelta(x.range(d3.range(0, 1.5, .5))(1/3), .5, 1e-6); |
| 55 | + assert.inDelta(x.range(d3.range(1))(1/3), 0, 1e-6); |
| 56 | + }, |
| 57 | + "range values are arbitrary": function(quantize) { |
| 58 | + var a = {}, b = {}, c = {}, x = quantize().range([a, b, c]); |
| 59 | + assert.equal(x(0), a); |
| 60 | + assert.equal(x(.2), a); |
| 61 | + assert.equal(x(.4), b); |
| 62 | + assert.equal(x(.6), b); |
| 63 | + assert.equal(x(.8), c); |
| 64 | + assert.equal(x(1), c); |
| 65 | + } |
| 66 | + } |
| 67 | +}); |
| 68 | + |
| 69 | +suite.export(module); |
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