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var vows = require("vows"),
_ = require("../../"),
load = require("../load"),
assert = require("../assert");
var suite = vows.describe("d3.svg.area");
suite.addBatch({
"area": {
topic: load("svg/area").expression("d3.svg.area"),
"x is an alias for setting x0 and x1": function(area) {
var a = area().x(f);
function f() {}
assert.equal(a.x(), f);
assert.equal(a.x0(), f);
assert.equal(a.x1(), f);
},
"x is an alias for getting x1": function(area) {
var a = area().x1(f);
function f() {}
assert.equal(a.x(), f);
},
"y is an alias for setting y0 and y1": function(area) {
var a = area().y(f);
function f() {}
assert.equal(a.y(), f);
assert.equal(a.y0(), f);
assert.equal(a.y1(), f);
},
"y is an alias for getting x1": function(area) {
var a = area().y1(f);
function f() {}
assert.equal(a.y(), f);
},
"x0 defaults to a function accessor": function(area) {
var a = area();
assert.pathEqual(a([[1, 2], [4, 3]]), "M1,2L4,3L4,0L1,0Z");
assert.typeOf(a.x0(), "function");
},
"x0 can be defined as a constant": function(area) {
var a = area().x0(0);
assert.pathEqual(a([[1, 2], [4, 3]]), "M1,2L4,3L0,0L0,0Z");
assert.equal(a.x0(), 0);
},
"x0 can be defined as a function": function(area) {
var a = area().x0(f), t = {}, dd = [], ii = [], tt = [];
function f(d, i) { dd.push(d); ii.push(i); tt.push(this); return 0; }
assert.pathEqual(a.call(t, [[1, 2], [4, 3]]), "M1,2L4,3L0,0L0,0Z");
assert.deepEqual(dd, [[1, 2], [4, 3]], "expected data, got {actual}");
assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
assert.deepEqual(tt, [t, t], "expected this, got {actual}");
},
"x1 defaults to a function accessor": function(area) {
var a = area();
assert.pathEqual(a([[1, 2], [4, 3]]), "M1,2L4,3L4,0L1,0Z");
assert.typeOf(a.x1(), "function");
},
"x1 can be defined as a constant": function(area) {
var a = area().x1(0);
assert.pathEqual(a([[1, 2], [4, 3]]), "M0,2L0,3L4,0L1,0Z");
assert.equal(a.x1(), 0);
},
"x1 can be defined as a function": function(area) {
var a = area().x1(f), t = {}, dd = [], ii = [], tt = [];
function f(d, i) { dd.push(d); ii.push(i); tt.push(this); return 0; }
assert.pathEqual(a.call(t, [[1, 2], [4, 3]]), "M0,2L0,3L4,0L1,0Z");
assert.deepEqual(dd, [[1, 2], [4, 3]], "expected data, got {actual}");
assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
assert.deepEqual(tt, [t, t], "expected this, got {actual}");
},
"y0 defaults to zero": function(area) {
var a = area();
assert.pathEqual(a([[1, 2], [4, 3]]), "M1,2L4,3L4,0L1,0Z");
assert.equal(a.y0(), 0);
},
"y0 can be defined as a constant": function(area) {
var a = area().y0(1);
assert.pathEqual(a([[1, 2], [4, 3]]), "M1,2L4,3L4,1L1,1Z");
assert.equal(a.y0(), 1);
},
"y0 can be defined as a function": function(area) {
var a = area().y0(f), t = {}, dd = [], ii = [], tt = [];
function f(d, i) { dd.push(d); ii.push(i); tt.push(this); return 1; }
assert.pathEqual(a.call(t, [[1, 2], [4, 3]]), "M1,2L4,3L4,1L1,1Z");
assert.deepEqual(dd, [[1, 2], [4, 3]], "expected data, got {actual}");
assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
assert.deepEqual(tt, [t, t], "expected this, got {actual}");
},
"y1 defaults to a function accessor": function(area) {
var a = area();
assert.pathEqual(a([[1, 2], [4, 3]]), "M1,2L4,3L4,0L1,0Z");
assert.typeOf(a.y1(), "function");
},
"y1 can be defined as a constant": function(area) {
var a = area().y1(1);
assert.pathEqual(a([[1, 2], [4, 3]]), "M1,1L4,1L4,0L1,0Z");
assert.equal(a.y1(), 1);
},
"y1 can be defined as a function": function(area) {
var a = area().y1(f), t = {}, dd = [], ii = [], tt = [];
function f(d, i) { dd.push(d); ii.push(i); tt.push(this); return 1; }
assert.pathEqual(a.call(t, [[1, 2], [4, 3]]), "M1,1L4,1L4,0L1,0Z");
assert.deepEqual(dd, [[1, 2], [4, 3]], "expected data, got {actual}");
assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
assert.deepEqual(tt, [t, t], "expected this, got {actual}");
},
"if x0 === x1, x is only evaluated once per point": function(area) {
var a = area().x(f), t = {}, dd = [], ii = [], tt = [];
function f(d, i) { dd.push(d); ii.push(i); tt.push(this); return 0; }
assert.pathEqual(a.call(t, [[1, 2], [4, 3]]), "M0,2L0,3L0,0L0,0Z");
assert.deepEqual(dd, [[1, 2], [4, 3]], "expected data, got {actual}");
assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
assert.deepEqual(tt, [t, t], "expected this, got {actual}");
},
"if y0 === y1, y is only evaluated once per point": function(area) {
var a = area().y(f), t = {}, dd = [], ii = [], tt = [];
function f(d, i) { dd.push(d); ii.push(i); tt.push(this); return 1; }
assert.pathEqual(a.call(t, [[1, 2], [4, 3]]), "M1,1L4,1L4,1L1,1Z");
assert.deepEqual(dd, [[1, 2], [4, 3]], "expected data, got {actual}");
assert.deepEqual(ii, [0, 1], "expected index, got {actual}");
assert.deepEqual(tt, [t, t], "expected this, got {actual}");
},
"interpolate defaults to linear": function(area) {
assert.equal(area().interpolate(), "linear");
},
"interpolate can be defined as a constant": function(area) {
var a = area().interpolate("step-before");
assert.pathEqual(a([[0, 0], [1, 1]]), "M0,0V1H1L1,0H0V0Z");
assert.equal(a.interpolate(), "step-before");
},
"invalid interpolates fallback to linear": function(area) {
assert.equal(area().interpolate("__proto__").interpolate(), "linear");
},
"tension defaults to .7": function(area) {
assert.equal(area().tension(), .7);
},
"tension can be specified as a constant": function(area) {
var a = area().tension(.5);
assert.equal(a.tension(), .5);
},
"returns null if input points array is empty": function(area) {
assert.isNull(area()([]));
},
"interpolate(linear)": {
"supports linear interpolation": testInterpolation("linear")
},
"interpolate(step)": {
"supports step-before interpolation": testInterpolation("step-before", "step-after"),
"supports step-after interpolation": testInterpolation("step-after", "step-before")
},
"interpolate(basis)": {
"supports basis interpolation": testInterpolation("basis"),
"supports basis-open interpolation": testInterpolation("basis-open")
},
"interpolate(cardinal)": {
"supports cardinal interpolation": testInterpolation("cardinal"),
"supports cardinal-open interpolation": testInterpolation("cardinal-open")
},
"interpolate(monotone)": {
"supports monotone interpolation": testInterpolation("monotone")
}
}
});
// An area is just two lines, with one reversed.
function testInterpolation(i0, i1) {
if (arguments.length < 2) i1 = i0;
return function(area) {
var a = area().interpolate(i0),
d = [[0, 0], [1, 1], [2, 0], [3, 1], [4, 0]],
l0 = _.svg.line().interpolate(i1).x(a.x0()).y(a.y0()),
l1 = _.svg.line().interpolate(i0).x(a.x1()).y(a.y1());
assert.pathEqual(a(d), l1(d) + "L" + l0(d.reverse()).substring(1) + "Z");
};
}
suite.export(module);