Eido

Describe what you see as plain data

From Greek eido — "I see"

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Images are values

A scene is a plain data structure — printable, serializable, diffable. Nothing opaque.

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One function

render takes a scene (or a sequence of scenes) and produces output. That's the entire API.

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Description, not instruction

You declare what the image contains — Eido decides how to draw it.

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Animations are sequences

60 frames = 60 scenes in a list. No timeline, no keyframes, no mutable state.

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Particle simulation

Physics-based effects — fire, snow, sparks — configured as data with deterministic results.

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Typography as paths

Text converted to vector paths — compatible with gradients, transforms, and 3D extrusion.

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Bring your own workflow

Every function takes data and returns data. No framework, no state management.

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Zero dependencies

Just the language and the standard library. Nothing to install, nothing to break.

How it works

In Eido, an image is just a description — a plain data structure that says what the image contains. Here's a red circle on a light background:

{:image/size [400 400]                       ;; 400x400 pixels
 :image/background [:color/rgb 245 243 238]  ;; warm off-white
 :image/nodes
 [{:node/type     :shape/circle
   :circle/center [200 200]                  ;; center of the canvas
   :circle/radius 120
   :style/fill    [:color/rgb 200 50 50]}]}  ;; red fill

That's it — no drawing commands, no canvas API, no mutable state. You describe what you see, and Eido renders it. To produce an image file:

(eido/render scene {:output "circle.png"})

Want animation? Return a different scene for each frame. Here's a circle that grows and shifts color over 60 frames:

(def frames
  (anim/frames 60
    (fn [t]                             ;; t goes from 0.0 to 1.0
      {:image/size [400 400]
       :image/background [:color/rgb 30 30 40]
       :image/nodes
       [{:node/type     :shape/circle
         :circle/center [200 200]
         :circle/radius (* 150 t)       ;; grows over time
         :style/fill [:color/hsl        ;; hue shifts through
                      (* 360 t)         ;;   the rainbow
                      0.8 0.5]}]})))

(eido/render frames {:output "grow.gif" :fps 30})

Every example in the gallery works this way — pure data in, image out.

Installation

io.github.leifericf/eido {:git/tag "v1.0.0-alpha5" :git/sha "03b38ab"}