Reduce filesize of spring and inertia generators

packages/motion-dom/src/animation/generators/__tests__/inertia.test.ts

@@ -360,56 +360,56 @@ const expectedAnimationKeyframesWithMin = [
     23.75667836122817, 21.30613194252669, 18.904109594038857, 16.54965047479793,
     14.241812769762973, 11.979673313080411, 9.762327218805297,
     7.5888875189348965, 5.458484808609711, 3.3702668983398354,
-    1.323398473117905, -0.6829392417180884, -2.5504366392219304,
-    -4.119369806458783, -5.343809500682082, -6.198520496050522,
-    -6.678188018315215, -6.795773895279445, -6.580163132703302,
-    -6.073279953832154, -5.3268604416091545, -4.399067385327798,
-    -3.3511227480280765, -2.2441156429408005, -1.136120366010626,
-    -0.07973153617477233, 0.8799065562226499, 1.7065300468331976,
-    2.37362871817985, 2.864773961641232, 3.1734378288347873, 3.302360175606138,
-    3.2625368901677088, 3.0719132051868026, 2.753872074110266,
-    2.335608739809387, 1.846479344239635, 1.3164042979261712,
-    0.7743968519689656, 0.24727467923178975, -0.24140190124916064,
-    -0.6721363140548124, -1.0300328250543445, -1.30506452397808,
-    -1.4920851036546723, -1.5906082587432058, -1.6043872707269085,
-    -1.5408337146515911, -1.4103181408493322, -1.2253970992892542,
-    -1.0000101421945307, -0.7486877106164858, -0.48580640224657123,
-    -0.22492239948750456, 0.021792795705084606, 0.2439973191859265,
-    0.4334948642340047, 0.5844188736374692, 0.6932888121343098,
-    0.7589480259929683, 0.7823974026306241, 0.7665426279792613,
-    0.7158752396658898, 0.6361088889525295, 0.5337923090315198,
-    0.4159195452371194, 0.2895561763537697, 0.16149771617176029,
-    0.037973319030147924, -0.07559548245909954, -0.17477481268355835,
-    -0.2562345571360686, -0.3178011178014577, -0.3584503485224228,
-    -0.3782466977185835, -0.37823656113066495, -0.36030525539150166,
-    -0.32700785143820765, -0.28138437101840846, -0.22676959095649116,
-    -0.1666069804396438, -0.10427519429859669, -0.042934148760251846,
-    0.014603890392405254, 0.06597447921726202, 0.10933041512042661,
-    0.14338004157100342, 0.16739558397970875, 0.1811939736709082,
-    0.1850936866775042, 0.17985192497466335, 0.16658698738329775,
-    0.14669091786299812, 0.12173749544390697, 0.0933903688489364,
-    0.06331567493104524, 0.03310285466958556, 0.004196638632041875,
-    -0.02215763825401838, -0.04495406989839077, -0.06345105763119208,
-    -0.07718129749175254, -0.0859478200857468, -0.08980759792920584,
-    -0.08904468012921841, -0.08413512397713321, -0.07570616574155123,
-    -0.06449211350032416, -0.05128936389831648, -0.03691275765931889,
-    -0.0221552144769921, -0.007752247846719602, 0.005647423141537939,
-    0.017504352738798582, 0.027403530576788012, 0.03506220467756449,
-    0.040330693153308554, 0.04318681334953267, 0.0437247997784003,
-    0.04213976040910249, 0.03870883241054338, 0.033770244339933406,
-    0.027701476109967472, 0.02089763744729107, 0.013751068552181367,
-    0.006633013241694939, -0.00012196425782889296, -0.0062283415763344264,
-    -0.011458500270676337, -0.01564800087287013, -0.018697362316561276,
-    -0.020570594078835346, -0.02129085960947034, -0.020933749523185694,
-    -0.019618710755027215, -0.017499213277943633, -0.014752240453738455,
-    -0.011567665365081987, -0.00813802736441628, -0.004649155175939006,
-    -0.0012720002997873648, 0.0018440474959955946, 0.0045761869003028,
-    0.006831493576234213, 0.008548480061993557, 0.009697017641601163,
-    0.010276779766636322, 0.010314421477998086, 0.009859748761770204,
-    0.008981155468606688, 0.007760613711452574, 0.006288497605736688,
-    0.004658501480378907, 0.0029628843619596023, 0.0012882350155569177,
-    -0.0002880913285060006, -0.0017007596413722969, -0.002898407017964739,
-    -0.0038447468026205616, -0.00451885327934322, -0.0049146914166663174, 0,
+    1.323398473117905, -0.6829392417180884, -2.5410326014563864,
+    -4.101902238713091, -5.319873422015533, -6.169865639422336,
+    -6.646621199315949, -6.7630679669369265, -6.547976213645946,
+    -6.0430877794146145, -5.299903794618887, -4.376315662172488,
+    -3.3332538512677767, -2.2315115992678196, -1.1288773808379744,
+    -0.0776826345876386, 0.8771585727084213, 1.6995718709876848,
+    2.363190704796105, 2.8516818495939003, 3.1585645377703133,
+    3.286579954199072, 3.246683764773457, 3.0567452884980573, 2.740042867341184,
+    2.323646122685416, 1.8367725167272368, 1.3091985357395746,
+    0.7697955807766584, 0.24524807281343838, -0.24100282714122964,
+    -0.6695613029300629, -1.0256109574762429, -1.2991810746896508,
+    -1.4851579383685267, -1.583064932803068, -1.5966438479919849,
+    -1.53327614653619, -1.4032868442111268, -1.2191751595075755,
+    -0.9948153554344805, -0.7446684769966139, -0.48304129804386037,
+    -0.22342309854335646, 0.022075708522620596, 0.24316619314082147,
+    0.4316950957175925, 0.5818279203174821, 0.6901047333736142,
+    0.7553781376133086, 0.7786475727158589, 0.7628076599163445,
+    0.7123306946434456, 0.6329045984123333, 0.5310477236547004,
+    0.41372096607653586, 0.28795582020103355, 0.16051448489448542,
+    0.03759507427140651, -0.07540839025625874, -0.1740850475085182,
+    -0.2551226380650384, -0.3163599045938195, -0.3567794672384564,
+    -0.37644717619946855, -0.3764059085589138, -0.35853317681913227,
+    -0.32537273991770715, -0.27995066955255526, -0.22558606649261018,
+    -0.1657059048998106, -0.10367238513547945, -0.04262978532223912,
+    0.014623787196960595, 0.06573603718945949, 0.10886951664424274,
+    0.1427396951126933, 0.16662320806411346, 0.1803387303580254,
+    0.18420398617769154, 0.17897320335629344, 0.16575983668444602,
+    0.1459496236731492, 0.12110901247412983, 0.0928937413513812,
+    0.06296188709724626, 0.03289507717831337, 0.0041308219658158975,
+    -0.022091884836511068, -0.044772382566424414, -0.06317307791869127,
+    -0.0768293604538175, -0.0855456396654032, -0.08937901209165267,
+    -0.08861250953574876, -0.08372018747390819, -0.07532648438980863,
+    -0.06416232292168611, -0.05102034295646993, -0.03671147048526515,
+    -0.022024753020921207, -0.007692053857625504, 0.0056411843014568435,
+    0.017438298606540704, 0.027286483199281716, 0.03490456280624432,
+    0.040143789472658335, 0.04298228862049804, 0.043514021942220205,
+    0.0419333118978449, 0.03851608346658833, 0.033599024377143065,
+    0.027557849358667716, 0.02078578358985113, 0.013673264013907142,
+    0.006589704444917432, -0.00013200789895279107, -0.006207809758054476,
+    -0.011411275499985534, -0.01557886099017781, -0.01861166890313651,
+    -0.020473982856576655, -0.02118894731331795, -0.020831869567978487,
+    -0.019521687481653435, -0.017411181804464698, -0.014676516327664965,
+    -0.011506665453913895, -0.008093240856956715, -0.004621161299767523,
+    -0.0012605274697481256, 0.0018400278436294317, 0.004558339534948625,
+    0.006801980047590764, 0.00850980900357551, 0.009651892873765064,
+    0.0102279536058988, 0.010264559707905225, 0.009811312553713853,
+    0.008936304234580061, 0.0077211314999743414, 0.006255744288126154,
+    0.00463338868122861, 0.0029458749195796813, 0.0012793637587843068,
+    -0.00028917850012965954, -0.001694751967601518, -0.0028862643266073717,
+    -0.0038276282797762946, -0.004498043571776675, -0.004891527821716417, 0,
 ]
 
 const expectedAnimationKeyframesNegative = [
@@ -524,51 +524,52 @@ const expectedAnimationKeyframesWithMax = [
     178.6938680574733, 181.09589040596114, 183.45034952520206, 185.758187230237,
     188.0203266869196, 190.2376727811947, 192.41111248106512, 194.5415151913903,
     196.62973310166018, 198.6766015268821, 200.6829392417181,
-    202.55043663922197, 204.11936980645882, 205.34380950068214,
-    206.1985204960506, 206.6781880183153, 206.79577389527952, 206.5801631327034,
-    206.07327995383224, 205.32686044160923, 204.39906738532787,
-    203.35112274802813, 202.24411564294084, 201.13612036601066,
-    200.0797315361748, 199.12009344377734, 198.29346995316678,
-    197.62637128182013, 197.13522603835872, 196.82656217116516,
-    196.6976398243938, 196.73746310983225, 196.92808679481317,
-    197.24612792588968, 197.66439126019057, 198.15352065576033,
-    198.6835957020738, 199.225603148031, 199.7527253207682, 200.24140190124916,
-    200.67213631405482, 201.03003282505435, 201.3050645239781,
-    201.4920851036547, 201.59060825874323, 201.60438727072693,
-    201.54083371465163, 201.41031814084934, 201.22539709928927,
-    201.00001014219455, 200.7486877106165, 200.48580640224657,
-    200.2249223994875, 199.9782072042949, 199.75600268081408, 199.566505135766,
-    199.41558112636253, 199.3067111878657, 199.24105197400704,
-    199.21760259736936, 199.23345737202072, 199.2841247603341,
-    199.36389111104745, 199.46620769096847, 199.58408045476287,
-    199.71044382364622, 199.83850228382823, 199.96202668096984,
-    200.0755954824591, 200.17477481268355, 200.25623455713608,
-    200.31780111780145, 200.35845034852244, 200.3782466977186,
-    200.37823656113068, 200.3603052553915, 200.32700785143822,
-    200.28138437101842, 200.2267695909565, 200.16660698043964,
-    200.1042751942986, 200.04293414876025, 199.9853961096076,
-    199.93402552078274, 199.89066958487956, 199.856619958429, 199.8326044160203,
-    199.8188060263291, 199.8149063133225, 199.82014807502534, 199.8334130126167,
-    199.853309082137, 199.8782625045561, 199.90660963115107, 199.93668432506897,
-    199.96689714533042, 199.99580336136796, 200.02215763825401,
-    200.04495406989838, 200.0634510576312, 200.07718129749176,
-    200.08594782008575, 200.0898075979292, 200.0890446801292,
-    200.08413512397715, 200.07570616574156, 200.06449211350034,
-    200.05128936389832, 200.0369127576593, 200.02215521447698,
-    200.00775224784672, 199.99435257685846, 199.9824956472612,
-    199.97259646942322, 199.96493779532244, 199.95966930684668,
-    199.95681318665046, 199.9562752002216, 199.9578602395909,
-    199.96129116758945, 199.96622975566007, 199.97229852389003,
-    199.9791023625527, 199.98624893144782, 199.9933669867583,
-    200.00012196425783, 200.00622834157633, 200.01145850027066,
-    200.01564800087286, 200.01869736231657, 200.02057059407883,
-    200.02129085960948, 200.02093374952318, 200.01961871075503,
-    200.01749921327794, 200.01475224045373, 200.01156766536508,
-    200.00813802736442, 200.00464915517594, 200.0012720002998,
-    199.998155952504, 199.9954238130997, 199.99316850642376, 199.991451519938,
-    199.9903029823584, 199.98972322023337, 199.989685578522, 199.99014025123822,
-    199.9910188445314, 199.99223938628856, 199.99371150239426,
-    199.99534149851962, 199.99703711563805, 199.99871176498445,
-    200.0002880913285, 200.00170075964138, 200.00289840701797,
-    200.00384474680263, 200.00451885327934, 200.00491469141667, 200,
+    202.54103260145638, 204.10190223871308, 205.31987342201552,
+    206.16986563942234, 206.64662119931594, 206.76306796693692,
+    206.54797621364594, 206.0430877794146, 205.2999037946189, 204.3763156621725,
+    203.33325385126778, 202.23151159926783, 201.12887738083796,
+    200.07768263458763, 199.12284142729158, 198.30042812901232,
+    197.6368092952039, 197.1483181504061, 196.8414354622297, 196.71342004580092,
+    196.75331623522655, 196.94325471150194, 197.25995713265883,
+    197.6763538773146, 198.16322748327275, 198.69080146426043,
+    199.23020441922336, 199.75475192718656, 200.24100282714122,
+    200.66956130293005, 201.02561095747623, 201.29918107468964,
+    201.48515793836853, 201.58306493280307, 201.596643847992, 201.5332761465362,
+    201.40328684421112, 201.21917515950759, 200.99481535543447,
+    200.74466847699662, 200.48304129804387, 200.22342309854335,
+    199.9779242914774, 199.7568338068592, 199.5683049042824, 199.4181720796825,
+    199.3098952666264, 199.24462186238668, 199.22135242728413,
+    199.23719234008365, 199.28766930535656, 199.36709540158768,
+    199.4689522763453, 199.58627903392346, 199.71204417979897,
+    199.8394855151055, 199.9624049257286, 200.07540839025626,
+    200.17408504750853, 200.25512263806505, 200.3163599045938,
+    200.35677946723845, 200.37644717619946, 200.37640590855892,
+    200.35853317681912, 200.3253727399177, 200.27995066955256,
+    200.2255860664926, 200.16570590489982, 200.10367238513547,
+    200.04262978532225, 199.98537621280303, 199.93426396281055,
+    199.89113048335577, 199.85726030488732, 199.83337679193588,
+    199.81966126964198, 199.8157960138223, 199.8210267966437,
+    199.83424016331554, 199.85405037632685, 199.87889098752586,
+    199.9071062586486, 199.93703811290274, 199.96710492282168,
+    199.99586917803418, 200.0220918848365, 200.04477238256644,
+    200.0631730779187, 200.07682936045381, 200.0855456396654,
+    200.08937901209165, 200.08861250953575, 200.08372018747392,
+    200.07532648438982, 200.06416232292167, 200.05102034295646,
+    200.03671147048527, 200.02202475302093, 200.00769205385762,
+    199.99435881569855, 199.98256170139345, 199.97271351680072,
+    199.96509543719375, 199.95985621052733, 199.9570177113795,
+    199.95648597805777, 199.95806668810215, 199.9614839165334,
+    199.96640097562286, 199.97244215064134, 199.97921421641016,
+    199.9863267359861, 199.9934102955551, 200.00013200789894,
+    200.00620780975805, 200.0114112755, 200.0155788609902, 200.01861166890313,
+    200.02047398285657, 200.0211889473133, 200.02083186956798,
+    200.01952168748164, 200.01741118180448, 200.01467651632765,
+    200.0115066654539, 200.00809324085697, 200.00462116129978,
+    200.00126052746975, 199.99815997215637, 199.99544166046505,
+    199.99319801995242, 199.99149019099642, 199.99034810712624,
+    199.9897720463941, 199.9897354402921, 199.99018868744628,
+    199.99106369576543, 199.99227886850002, 199.99374425571187,
+    199.99536661131876, 199.9970541250804, 199.99872063624122,
+    200.00028917850014, 200.0016947519676, 200.0028862643266,
+    200.00382762827977, 200.00449804357177, 200.0048915278217, 200,
 ]

packages/motion-dom/src/animation/generators/inertia.ts

@@ -4,7 +4,6 @@ import {
     ValueAnimationOptions,
 } from "../types"
 import { spring as createSpring } from "./spring"
-import { getGeneratorVelocity } from "./utils/velocity"
 
 export function inertia({
     keyframes,
@@ -26,8 +25,7 @@ export function inertia({
         value: origin,
     }
 
-    const isOutOfBounds = (v: number) =>
-        (min !== undefined && v < min) || (max !== undefined && v > max)
+    const isOutOfBounds = (v: number) => v < min! || v > max!
 
     const nearestBoundary = (v: number) => {
         if (min === undefined) return max
@@ -48,13 +46,10 @@ export function inertia({
 
     const calcDelta = (t: number) => -amplitude * Math.exp(-t / timeConstant)
 
-    const calcLatest = (t: number) => target + calcDelta(t)
-
     const applyFriction = (t: number) => {
         const delta = calcDelta(t)
-        const latest = calcLatest(t)
         state.done = Math.abs(delta) <= restDelta
-        state.value = state.done ? target : latest
+        state.value = state.done ? target : target + delta
     }
 
     /**
@@ -73,7 +68,12 @@ export function inertia({
 
         spring = createSpring({
             keyframes: [state.value, nearestBoundary(state.value)!],
-            velocity: getGeneratorVelocity(calcLatest, t, state.value), // TODO: This should be passing * 1000
+            /**
+             * The friction curve is target + calcDelta(t), so its exact
+             * derivative is -calcDelta(t) / timeConstant in units/ms,
+             * converted here to the units/second expected by spring.
+             */
+            velocity: (-calcDelta(t) / timeConstant) * 1000,
             damping: bounceDamping,
             stiffness: bounceStiffness,
             restDelta,