67 строки
2.2 KiB
JavaScript
67 строки
2.2 KiB
JavaScript
require("../env");
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var assert = require("../env-assert");
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module.exports = {
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topic: function() {
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var cb = this.callback,
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dd = [],
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ii = [],
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tt = [],
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vv = [];
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var s = d3.select("body").html("").append("div").selectAll("div")
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.data(["red", "green"])
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.enter().append("div")
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.attr("color", function(d) { return d3.rgb(d)+""; });
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var t = s.transition()
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.attrTween("color", tween);
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function tween(d, i, v) {
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dd.push(d);
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ii.push(i);
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vv.push(v);
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if (tt.push(this) >= 2) cb(null, {
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selection: s,
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transition: t,
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data: dd,
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index: ii,
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value: vv,
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context: tt
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});
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return i && d3.interpolateHsl(v, "blue");
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}
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},
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// The order here is a bit brittle: because the transition has zero delay,
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// it's invoking the start event immediately for all nodes, rather than
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// pushing each node onto the timer queue (which would reverse the order of
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// callbacks). The order in which tweens are invoked is undefined, so perhaps
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// we should sort the expected and actual values before comparing.
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"defines the corresponding attr tween": function(result) {
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assert.typeOf(result.transition.tween("attr.color"), "function");
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},
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"invokes the tween function": function(result) {
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assert.deepEqual(result.data, ["green", "red"], "expected data, got {actual}");
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assert.deepEqual(result.index, [1, 0], "expected data, got {actual}");
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assert.deepEqual(result.value, ["#008000", "#ff0000"], "expected value, got {actual}");
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assert.domEqual(result.context[0], result.selection[0][1], "expected this, got {actual}");
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assert.domEqual(result.context[1], result.selection[0][0], "expected this, got {actual}");
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},
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"end": {
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topic: function(result) {
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var cb = this.callback;
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result.transition.each("end", function(d, i) { if (i >= 1) cb(null, result); });
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},
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"uses the returned interpolator": function(result) {
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assert.equal(result.selection[0][1].getAttribute("color"), "#0000ff");
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},
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"does nothing if the interpolator is falsey": function(result) {
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assert.equal(result.selection[0][0].getAttribute("color"), "#ff0000");
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}
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}
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};
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