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experiment with another form of grid looping
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var ArrayGrid = require('array-grid') | |
var deepEqual = require('deep-equal') | |
var unwrap = require('./unwrap') | |
module.exports = createLoop | |
function createLoop (frames, startTime, loopLength) { | |
if (frames.length) { | |
var shape = frames[frames.length - 1].value.shape | |
var length = shape[0] * shape[1] | |
var data = Array(length).fill(null) | |
for (var f = 0; f < frames.length; f++) { | |
var frame = frames[f] | |
if (frame.at < startTime) { | |
data = frame.value.data.slice() | |
} | |
if (frame.at >= startTime && frame.at < startTime + loopLength) { | |
var value = frame.value.data | |
for (var i = 0; i < length; i++) { | |
if (notSame(data[i], value[i])) { | |
var a = slice(unwrap(data[i], startTime, loopLength), startTime, frame.at) | |
var b = slice(unwrap(value[i], startTime, loopLength), frame.at) | |
data[i] = wrap(squish(a.concat(b)), loopLength) | |
} | |
} | |
} | |
} | |
return ArrayGrid(data, shape) | |
} | |
} | |
function notSame (a, b) { | |
return a !== b || !deepEqual(a, b) | |
} | |
function slice (events, start, end) { | |
var result = [] | |
var lastValue = null | |
for (var i = 0; i < events.length; i++) { | |
var event = events[i] | |
if (event[0] >= start && (event[0] < end || end == null)) { | |
if (!result.length && event[0] > start) { | |
result.push([start, lastValue]) | |
} | |
result.push(event) | |
} | |
lastValue = event[1] | |
} | |
if (!result.length && (end > start || end == null)) { | |
result.push([start, lastValue]) | |
} | |
return result | |
} | |
function squish (items) { | |
return items.reduce(function (result, item, i) { | |
var lastItem = result[result.length - 1] | |
if (!lastItem || lastItem[1] !== item[1]) { | |
result.push(item) | |
} | |
return result | |
}, []) | |
} | |
function wrap (events, loopLength) { | |
if (events.length === 1) { | |
return events[0][1] | |
} | |
var result = [loopLength] | |
events.forEach(function (ev) { | |
result.push([ev[0] % loopLength, ev[1]]) | |
}) | |
result.sort(byTime) | |
return result | |
} | |
function byTime (a, b) { | |
return a[0] - b[0] | |
} |
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var Observ = require('observ') | |
var ArrayGrid = require('array-grid') | |
module.exports = GridPlayer | |
function GridPlayer (currentPosition, frameDuration) { | |
var obs = Observ() | |
var set = obs.set | |
var grid = null | |
var result = [] | |
obs.set = function (value) { | |
grid = value | |
refresh() | |
} | |
currentPosition(refresh) | |
return obs | |
function refresh () { | |
var changed = false | |
if (grid && grid.data) { | |
grid.data.forEach(function (loop, i) { | |
var newValue = valueOf(loop, currentPosition() || 0) | |
if (newValue !== result[i]) { | |
if (!changed) { | |
changed = true | |
result = result.slice() | |
} | |
result[i] = newValue | |
} | |
}) | |
} | |
if (changed) { | |
set(ArrayGrid(result, grid.shape)) | |
} | |
} | |
} | |
function valueOf (loop, currentPosition) { | |
var result = [] | |
if (Array.isArray(loop) && loop.length > 1) { | |
var startPosition = 0 | |
var length = loop[0] | |
var events = loop.slice(1) | |
var start = currentPosition % length | |
while (events[startPosition] && events[startPosition][0] <= start) { | |
startPosition = startPosition + 1 | |
if (startPosition > events.length) { | |
startPosition = 0 | |
break | |
} | |
} | |
var event = events[mod(startPosition - 1, events.length)] | |
return event[1] | |
} else { | |
var value = Array.isArray(loop) ? null : loop | |
return value | |
} | |
return result | |
} | |
function mod (n, m) { | |
return ((n % m) + m) % m | |
} |
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var Observ = require('observ') | |
module.exports = ObservRecorder | |
function ObservRecorder (currentTime) { | |
var obs = Observ([]) | |
var set = obs.set | |
obs.set = function (value) { | |
var newValue = obs().concat({ | |
at: currentTime(), | |
value: value | |
}) | |
set(newValue) | |
} | |
return obs | |
} |
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module.exports = unwrap | |
function unwrap (loop, startTime, targetLength) { | |
var result = [] | |
if (Array.isArray(loop) && loop.length > 1) { | |
var startPosition = 0 | |
var length = loop[0] | |
var events = loop.slice(1) | |
var start = startTime % length | |
while (events[startPosition] && events[startPosition][0] < start) { | |
startPosition = startPosition + 1 | |
if (startPosition > events.length) { | |
startPosition = 0 | |
break | |
} | |
} | |
for (var i = startPosition; true; i++) { | |
var event = events[i % events.length] | |
var offset = Math.floor(i / events.length) * length | |
var position = event[0] - start + startTime + offset | |
if (position < startTime + targetLength) { | |
result.push([position, event[1]]) | |
} else { | |
break | |
} | |
} | |
} else { | |
var value = Array.isArray(loop) ? null : loop | |
result.push([startTime, value]) | |
} | |
return result | |
} | |
// | |
// console.log(unwrap([4, | |
// [0, 1], [0.5, 0], | |
// [1, 2], [1.5, 0], | |
// [2, 3], [2.5, 0], | |
// [3, 4], [3.5, 0] | |
// ], 0.1, 0.1)) |
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