var vows = require(“vows”),

load = require("../load"),
assert = require("../assert");

var suite = vows.describe(“d3.scale.sqrt”);

suite.addBatch({

"sqrt": {
  topic: load("scale/sqrt", "interpolate/hsl"), // beware instanceof d3_Color

  "domain": {
    "defaults to [0, 1]": function(d3) {
      var x = d3.scale.sqrt();
      assert.deepEqual(x.domain(), [0, 1]);
      assert.inDelta(x(.5), 0.7071068, 1e-6);
    },
    "coerces domain to numbers": function(d3) {
      var x = d3.scale.sqrt().domain([new Date(1990, 0, 1), new Date(1991, 0, 1)]);
      assert.equal(typeof x.domain()[0], "number");
      assert.equal(typeof x.domain()[1], "number");
      assert.inDelta(x(new Date(1989, 09, 20)), -.2, 1e-2);
      assert.inDelta(x(new Date(1990, 00, 01)), 0, 1e-2);
      assert.inDelta(x(new Date(1990, 02, 15)), .2, 1e-2);
      assert.inDelta(x(new Date(1990, 04, 27)), .4, 1e-2);
      assert.inDelta(x(new Date(1991, 00, 01)), 1, 1e-2);
      assert.inDelta(x(new Date(1991, 02, 15)), 1.2, 1e-2);
      var x = d3.scale.sqrt().domain(["0", "1"]);
      assert.equal(typeof x.domain()[0], "number");
      assert.equal(typeof x.domain()[1], "number");
      assert.inDelta(x(.5), 0.7071068, 1e-6);
      var x = d3.scale.sqrt().domain([new Number(0), new Number(1)]);
      assert.equal(typeof x.domain()[0], "number");
      assert.equal(typeof x.domain()[1], "number");
      assert.inDelta(x(.5), 0.7071068, 1e-6);
    },
    "can specify a polypower domain and range": function(d3) {
      var x = d3.scale.sqrt().domain([-10, 0, 100]).range(["red", "white", "green"]);
      assert.equal(x(-5), "#ff4b4b");
      assert.equal(x(50), "#4ba54b");
      assert.equal(x(75), "#229122");
    },
    "preserves specified domain exactly, with no floating point error": function(d3) {
      var x = d3.scale.sqrt().domain([0, 5]);
      assert.deepEqual(x.domain(), [0, 5]);
    }
  },

  "range": {
    "defaults to [0, 1]": function(d3) {
      var x = d3.scale.sqrt();
      assert.deepEqual(x.range(), [0, 1]);
      assert.inDelta(x.invert(.5), .25, 1e-6);
    },
    "does not coerce range to numbers": function(d3) {
      var x = d3.scale.sqrt().range(["0", "2"]);
      assert.equal(typeof x.range()[0], "string");
      assert.equal(typeof x.range()[1], "string");
    },
    "coerces range value to number on invert": function(d3) {
      var x = d3.scale.sqrt().range(["0", "2"]);
      assert.inDelta(x.invert("1"), .25, 1e-6);
      var x = d3.scale.sqrt().range([new Date(1990, 0, 1), new Date(1991, 0, 1)]);
      assert.inDelta(x.invert(new Date(1990, 6, 2, 13)), .25, 1e-6);
      var x = d3.scale.sqrt().range(["#000", "#fff"]);
      assert.isNaN(x.invert("#999"));
    },
    "can specify range values as colors": function(d3) {
      var x = d3.scale.sqrt().range(["red", "blue"]);
      assert.equal(x(.25), "#800080");
      var x = d3.scale.sqrt().range(["#ff0000", "#0000ff"]);
      assert.equal(x(.25), "#800080");
      var x = d3.scale.sqrt().range(["#f00", "#00f"]);
      assert.equal(x(.25), "#800080");
      var x = d3.scale.sqrt().range([d3.rgb(255,0,0), d3.hsl(240,1,.5)]);
      assert.equal(x(.25), "#800080");
      var x = d3.scale.sqrt().range(["hsl(0,100%,50%)", "hsl(240,100%,50%)"]);
      assert.equal(x(.25), "#800080");
    },
    "can specify range values as arrays or objects": function(d3) {
      var x = d3.scale.sqrt().range([{color: "red"}, {color: "blue"}]);
      assert.deepEqual(x(.25), {color: d3.rgb(128, 0, 128)});
      var x = d3.scale.sqrt().range([["red"], ["blue"]]);
      assert.deepEqual(x(.25), [d3.rgb(128, 0, 128)]);
    }
  },

  "exponent": {
    "defaults to .5": function(d3) {
      var x = d3.scale.sqrt();
      assert.equal(x.exponent(), .5);
    },
    "observes the specified exponent": function(d3) {
      var x = d3.scale.sqrt().exponent(.5).domain([1, 2]);
      assert.inDelta(x(1), 0, 1e-6);
      assert.inDelta(x(1.5), 0.5425821, 1e-6);
      assert.inDelta(x(2), 1, 1e-6);
      var x = d3.scale.sqrt().exponent(2).domain([1, 2]);
      assert.inDelta(x(1), 0, 1e-6);
      assert.inDelta(x(1.5), .41666667, 1e-6);
      assert.inDelta(x(2), 1, 1e-6);
      var x = d3.scale.sqrt().exponent(-1).domain([1, 2]);
      assert.inDelta(x(1), 0, 1e-6);
      assert.inDelta(x(1.5), .6666667, 1e-6);
      assert.inDelta(x(2), 1, 1e-6);
    },
    "changing the exponent does not change the domain or range": function(d3) {
      var x = d3.scale.sqrt().domain([1, 2]).range([3, 4]), f = d3.format(".6f");
      x.exponent(.5);
      assert.deepEqual(x.domain().map(f), [1, 2]);
      assert.deepEqual(x.range(), [3, 4]);
      x.exponent(2);
      assert.deepEqual(x.domain().map(f), [1, 2]);
      assert.deepEqual(x.range(), [3, 4]);
      x.exponent(-1);
      assert.deepEqual(x.domain().map(f), [1, 2]);
      assert.deepEqual(x.range(), [3, 4]);
    }
  },

  "interpolate": {
    "defaults to d3.interpolate": function(d3) {
      var x = d3.scale.sqrt().range(["red", "blue"]);
      assert.equal(x.interpolate(), d3.interpolate);
      assert.rgbEqual(x(.5), 75, 0, 180);
    },
    "can specify a custom interpolator": function(d3) {
      var x = d3.scale.sqrt().range(["red", "blue"]).interpolate(d3.interpolateHsl);
      assert.hslEqual(x(.25), -60, 1, .5);
    }
  },

  "clamp": {
    "defaults to false": function(d3) {
      var x = d3.scale.sqrt();
      assert.isFalse(x.clamp());
      assert.inDelta(x(-.5), -0.7071068, 1e-6);
      assert.inDelta(x(1.5), 1.22474487, 1e-6);
    },
    "can clamp to the domain": function(d3) {
      var x = d3.scale.sqrt().clamp(true);
      assert.inDelta(x(-.5), 0, 1e-6);
      assert.inDelta(x(.25), .5, 1e-6);
      assert.inDelta(x(1.5), 1, 1e-6);
      var x = d3.scale.sqrt().domain([1, 0]).clamp(true);
      assert.inDelta(x(-.5), 1, 1e-6);
      assert.inDelta(x(.25), .5, 1e-6);
      assert.inDelta(x(1.5), 0, 1e-6);
    }
  },

  "maps a number to a number": function(d3) {
    var x = d3.scale.sqrt().domain([1, 2]);
    assert.inDelta(x(.5), -0.7071068, 1e-6);
    assert.inDelta(x(1), 0, 1e-6);
    assert.inDelta(x(1.5), 0.5425821, 1e-6);
    assert.inDelta(x(2), 1, 1e-6);
    assert.inDelta(x(2.5), 1.4029932, 1e-6);
  },

  "ticks": {
    "can generate ticks of varying degree": function(d3) {
      var x = d3.scale.sqrt();
      assert.deepEqual(x.ticks(1).map(x.tickFormat(1)), [0, 1]);
      assert.deepEqual(x.ticks(2).map(x.tickFormat(2)), [0, .5, 1]);
      assert.deepEqual(x.ticks(5).map(x.tickFormat(5)), [0, .2, .4, .6, .8, 1]);
      assert.deepEqual(x.ticks(10).map(x.tickFormat(10)), [0, .1, .2, .3, .4, .5, .6, .7, .8, .9, 1]);
      var x = d3.scale.sqrt().domain([1, 0]);
      assert.deepEqual(x.ticks(1).map(x.tickFormat(1)), [0, 1]);
      assert.deepEqual(x.ticks(2).map(x.tickFormat(2)), [0, .5, 1]);
      assert.deepEqual(x.ticks(5).map(x.tickFormat(5)), [0, .2, .4, .6, .8, 1]);
      assert.deepEqual(x.ticks(10).map(x.tickFormat(10)), [0, .1, .2, .3, .4, .5, .6, .7, .8, .9, 1]);
    }
  },

  "nice": {
    "can nice the domain, extending it to round numbers": function(d3) {
      var x = d3.scale.sqrt().domain([1.1, 10.9]).nice(), f = d3.format(".6f");
      assert.deepEqual(x.domain().map(f), [1, 11]);
      var x = d3.scale.sqrt().domain([10.9, 1.1]).nice();
      assert.deepEqual(x.domain().map(f), [11, 1]);
      var x = d3.scale.sqrt().domain([.7, 11.001]).nice();
      assert.deepEqual(x.domain().map(f), [0, 12]);
      var x = d3.scale.sqrt().domain([123.1, 6.7]).nice();
      assert.deepEqual(x.domain().map(f), [130, 0]);
      var x = d3.scale.sqrt().domain([0, .49]).nice();
      assert.deepEqual(x.domain().map(f), [0, .5]);
    },
    "nicing a polypower domain only affects the extent": function(d3) {
      var x = d3.scale.sqrt().domain([1.1, 1, 2, 3, 10.9]).nice(), f = d3.format(".6f");
      assert.deepEqual(x.domain().map(f), [1, 1, 2, 3, 11]);
      var x = d3.scale.sqrt().domain([123.1, 1, 2, 3, -.9]).nice();
      assert.deepEqual(x.domain().map(f), [130, 1, 2, 3, "-10.000000"]);
    },
    "preserves specified domain exactly, with no floating point error": function(d3) {
      var x = d3.scale.sqrt().domain([0, 5]).nice();
      assert.deepEqual(x.domain(), [0, 5]);
    }
  },

  "copy": {
    "changes to the domain are isolated": function(d3) {
      var x = d3.scale.sqrt(), y = x.copy();
      x.domain([1, 2]);
      assert.deepEqual(y.domain(), [0, 1]);
      assert.equal(x(1), 0);
      assert.equal(y(1), 1);
      y.domain([2, 3]);
      assert.equal(x(2), 1);
      assert.equal(y(2), 0);
      assert.inDelta(x.domain(), [1, 2], 1e-6);
      assert.inDelta(y.domain(), [2, 3], 1e-6);
    },
    "changes to the range are isolated": function(d3) {
      var x = d3.scale.sqrt(), y = x.copy();
      x.range([1, 2]);
      assert.equal(x.invert(1), 0);
      assert.equal(y.invert(1), 1);
      assert.deepEqual(y.range(), [0, 1]);
      y.range([2, 3]);
      assert.equal(x.invert(2), 1);
      assert.equal(y.invert(2), 0);
      assert.deepEqual(x.range(), [1, 2]);
      assert.deepEqual(y.range(), [2, 3]);
    },
    "changes to the exponent are isolated": function(d3) {
      var x = d3.scale.sqrt().exponent(2), y = x.copy();
      x.exponent(.5);
      assert.inDelta(x(.5), Math.SQRT1_2, 1e-6);
      assert.inDelta(y(.5), 0.25, 1e-6);
      assert.equal(x.exponent(), .5);
      assert.equal(y.exponent(), 2);
      y.exponent(3);
      assert.inDelta(x(.5), Math.SQRT1_2, 1e-6);
      assert.inDelta(y(.5), 0.125, 1e-6);
      assert.equal(x.exponent(), .5);
      assert.equal(y.exponent(), 3);
    },
    "changes to the interpolator are isolated": function(d3) {
      var x = d3.scale.sqrt().range(["red", "blue"]), y = x.copy();
      x.interpolate(d3.interpolateHsl);
      assert.equal(x(0.5), "#9500ff");
      assert.equal(y(0.5), "#4b00b4");
      assert.equal(y.interpolate(), d3.interpolate);
    },
    "changes to clamping are isolated": function(d3) {
      var x = d3.scale.sqrt().clamp(true), y = x.copy();
      x.clamp(false);
      assert.equal(x(2), Math.SQRT2);
      assert.equal(y(2), 1);
      assert.isTrue(y.clamp());
      y.clamp(false);
      assert.equal(x(2), Math.SQRT2);
      assert.equal(y(2), Math.SQRT2);
      assert.isFalse(x.clamp());
    }
  }
}

});

suite.export(module);