open web tools for creativity and community
SQLite Geospatial - intersections!London Isodemographic CartogramGolden Tonal Palette AnalysisHexbin Transform / Observable PlotNBA Finals, Game 4Disk Sampling on a SphereNBA Finals, Game 1Build your first scatterplot with Observable PlotDisplaying IBM Carbon charts in ObservableModelo de Cúpula CatenáriaBivariate Bubble MapAnalyzing Star Wars movies + the first anniversary of Observable Plot!Single-family homes owned by large corporate landlords in North CarolinaThe MoMA Collection DataMapping the Vietnamese DiasporaElection map as striped circles #2They heard the callDiagrammatic EmbeddingsHegel's Complete System of PhilosophyGeneration Arc DiagramVulnerability of Mountain PeoplesVisualizing Air Raid Sirens in UkraineUkrainian refugees welcomeConcentric Circles in D3Daylight Saving Time Gripe Assistant ToolPerceptually uniform color models and their implicationsTop Notebooks of February 2022Zillow Home PricesBlack History Month ActivityExamples from: Three Simple Flexible tools for Empowered Data VisualizationFull Covid Vaccination Rate in CA by County Over TimePlot CheatsheetsHunga Tonga–Hunga Ha'apai Global Pressure WaveVisualizing The New York Times’s Mini Crossword100 Beautiful and Informative Notebooks of 2021When Presidents Fade AwayThe Most Frequently Used Emoji of 2021Upset Plots with Observable PlotLucy mission animationSpreadsheet-based data collaboration gets supercharged with Observable30 Day Map Challenge: Day 4 - HexagonsDisputed territoriesMapping the Cities of US Highway SignsThirty day Map Challenge: Day 1 - PointsCube Pushing Loop 💪 🧊 🔄Guided Tour of an Infinite Sphere GridCanvas, P5.js and circle packing (collision and cluster force) on a mapWomen's History Month DataViz ContestWomen in DataViz EventSVG flowersMultiple Set Venn with Color BlendingA Stupid Emoji Utility FunctionQuilting with d3-curveCurvilinear RosettesStrange AttractorsSolo board gameDouble pendilumVertical SlidersDrawing and animating blobs with svg and javascriptOrbiting Particles III#genuary 2021 ~ Do some golf!Imitation Game 🖐Happy New Year (2019) (And other celebrations)Earth Temperature SpiralStar MapCorrelation FilteringBattle of ColorsPapercraft Christmas Ornaments GeneratorChristmas Tree Perspective 🎄bouncing circles2D (Non-physical) N-body Gravity with Poisson's EquationWaterfall Fill2020 TimelineTime Spiral with a COVID DemoTransition between Three.js camerasJulio Le Parc Replications and VariationsFlexible HeatmapSquare PackingTrainsWhy use a radial data visualization?Earthquakes from the past 30 daysThe US COVID SyringeHello OGL - Minimal WebGL libraryVersor MultiplicationLabyrinthTruncated-octahedron-based 3D-space-filling curveNUTS regions (The Nomenclature of territorial units for statistics): PerspectiveStretchy FishTP3: Power Diagram and Semi-Discrete Optimal TransportEmoji ParticlesFirma de color de BogotáCovid19 WorldwideWeb 3.0 Explorable # 3: NFTs -- Game Items With Real World ValueUnemployment ExplorationSierpinski curveEight QueensVoronoi StipplingSpinning out of controlFragment shader raytracerSunny day, rainy day in SeattleAs votes are countedOrbit of the dayVoronoi ClothTry to impeach this? Challenge accepted!Dispersion in Water Surface WavesSelf-Organizing Maps meet DelaunayGenerative ArtReturn to a squareCreating a Canvas Noise Map for Generative ArtMARTINI: Real-Time RTIN Terrain MeshMunsell spinGenerative artAs votes come in, what would it take for the trailing candidate to win?3a. Historical participation in early voting vs. Election Day votingWaffle ChartSun settingRaymarch HelperF1 Constructor Standings 2010-2019Electoral College Decision TreeThe Woman Citizen's Wheel of Progress, 1917Equisurface bull's eye
Sierpiński curve animation
Also listed in…
animation
MIN = 0
MAX = 11
DELTA = MAX - MIN
interpolators = Array(DELTA)
.fill()
.map((_, i) => {
const from = i + MIN;
return d3.interpolate(
// To interpolate between n and n+1, double the points in n
doubleArray(sierpinskiCurve(size, from).points),
sierpinskiCurve(size, from + 1).points
);
})
timeUpdater = {
const elapsed = playing ? now - startTime : 0;
if (elapsedTime !== elapsed) {
mutable elapsedTime = elapsed;
}
}
mutable elapsedTime = 0
playhead = Math.abs(
((elapsedTime + TIME_TOTAL) % (TIME_TOTAL * 2)) - TIME_TOTAL
) // Linear interpolation back and forth (saw wave) from 0 to TIME_TOTAL
goingUp = !playing || Math.floor(elapsedTime / TIME_TOTAL) % 2 === 0
// It took a couple of days to think how to do this in a stateless way
interp = playing ? DELTA * (playhead / TIME_TOTAL) : sliderValue - MIN
interpIndex = Math.floor(interp)
interpRemainder = interp % 1
smoothRemainder = Math.sin(interpRemainder * Math.PI + Math.PI / 2) / -2 + 0.5
points = {
if (!playing) {
let index = interpIndex;
let remainder = interpRemainder;
if (index >= interpolators.length) {
index = interpolators.length - 1;
remainder = 1;
}
return yield interpolators[index](remainder);
}
while (playing) {
yield interpolators[interpIndex](smoothRemainder);
}
}
pathEl = d3.select(animatedSVG).select('path#curve')
{
// So we don't remake the svg on every frame of animation,
// this cell will update the path's d attribute when the
// points array changes
pathEl.attr('d', lineGen(points) + "Z");
}
triangles = Array(DELTA + 1)
.fill()
.map((_, i) => {
const from = i + MIN;
return sierpinskiCurve(size, from).triangles.reduce((d, tri) => {
return (
d +
`M ${tri[0][0]},${tri[0][1]} L ${tri[1][0]},${tri[1][1]} L ${tri[2][0]},${tri[2][1]} Z `
);
}, '');
})
triIndexUpdater = {
// Make grid match the target iteration of the curve animation
let index = goingUp ? Math.ceil(interp) : Math.floor(interp);
if (index >= triangles.length) {
index = triangles.length - 1;
}
if (triIndex !== index) {
mutable triIndex = index;
}
}
mutable triIndex = 0
gridPathEl = d3.select(animatedSVG).select('path#grid')
{
const path = triangles[triIndex];
gridPathEl.attr('d', path);
}
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
