test.js

var test = require('tape').test

var Keyframes = require('./')

test('simple', function (t) {
	var keys = [
		{ time: 0, value: [ 0, 0 ] },
		{ time: 1, value: [ 10, 5 ] }
	]

	var timeline = Keyframes(keys)
	var array = [ 0, 0 ]
	var newArray = timeline.value(0.5, undefined, array)
	t.equal(newArray, array, 're-uses array')
	t.deepEqual(newArray, [ 5, 2.5 ], 'interpolates array')

	timeline.value(0.5, function (start, end, time, out) {
		out[0] = 50
		out[1] = 25
		t.deepEqual(start, keys[0], 'gets first')
		t.deepEqual(end, keys[1], 'gets last')
		t.equal(time, 0.5, 'gets time')
	}, array)
	t.deepEqual(array, [ 50, 25 ], 'gets custom interpolation')

	t.deepEqual(timeline.value(-1), [ 0, 0 ], 'first keyframe')
	t.deepEqual(timeline.value(1000), [ 10, 5 ], 'last keyframe')
	t.end()
})

test('timeline controls', function(t) {
	var keys = [
		{ time: 2, value: 1 },
		{ time: 4, value: 2 },
		{ time: 0, value: 3 },
	]
	var sorted = [
		{ time: 0, value: 3 },
		{ time: 2, value: 1 },
		{ time: 4, value: 2 },
	]

	var c1 = Keyframes(keys)

	t.equal(c1.count, 3, 'count is correct')
	t.deepEqual(c1.frames, sorted, 'the keys are sorted')

	t.equal(c1.nearest(3.5, 0.4), null, 'nearest with small radius returns null' )
	t.deepEqual(c1.nearest(3.5), sorted[2], 'nearest finds nearest keyframe' )
	t.deepEqual(c1.get(1), null, 'get strict')
	t.deepEqual(c1.get(2), sorted[1], 'get strict')

	t.deepEqual(c1.next(-1), sorted[0], 'jumps to next keyframe')
	t.deepEqual(c1.next(0.5), sorted[1], 'jumps to next keyframe')
	t.deepEqual(c1.next(2), sorted[2], 'jumps to next keyframe')
	t.deepEqual(c1.next(4), null, 'jumps to next keyframe')
	t.deepEqual(c1.next(4.5), null, 'jumps to next keyframe')

	t.deepEqual(c1.previous(-1), null, 'jumps to previous keyframe')
	t.deepEqual(c1.previous(0.5), sorted[0], 'jumps to previous keyframe')
	t.deepEqual(c1.previous(2), sorted[0], 'jumps to previous keyframe')
	t.deepEqual(c1.previous(4), sorted[1], 'jumps to previous keyframe')
	t.deepEqual(c1.previous(4.5), sorted[2], 'jumps to previous keyframe')

	t.equal(c1.value(0), 3, 'interpolation')
	t.equal(c1.value(1), 2, 'interpolation')
	t.equal(c1.value(-1), 3, 'interpolation')
	t.equal(c1.value(4), 2, 'interpolation')
	t.equal(c1.value(3), 1.5, 'interpolation')
	t.equal(c1.value(5), 2, 'interpolation')


	var idx = c1.nearestIndex(4)
	c1.splice(idx, 1)
	sorted.splice(idx, 1)
	t.deepEqual(c1.frames, sorted, 'splice works')

	var newItem = { time: 10, value: 1 }
	c1.splice(0, 0, newItem)
	sorted.splice(0, 0, newItem)
	t.notDeepEqual(c1.frames, sorted, 'splice insert re-sorts array')

	var two = Keyframes([ { time: 0, value: 50 }])
	t.equal(two.previous(100), two.frames[0])
	t.equal(two.next(100), null)

	t.end()
})