Prepare an animated GIF

Build the portable timeline

Animation state remains ordinary RiX data. This two-frame derivation changes the highlighted side of the equation without storing browser or encoder state.

Runnable RiXRun cell

.Plugin.Load("gif"); frame := (step) -> .Graphics.Graphic([360, 140], [ .Graphics.Rectangle([0, 0], [360, 140], {= fill="#ffffff" }), .Graphics.Text([180, 55], "x² - 1 = (x - 1)(x + 1)", {= anchor=:middle, size=22 }), .Graphics.Text([180, 98], step == 1 ?: "difference of squares" ?_ "zeros at -1 and 1", {= anchor=:middle, size=16, fill="#2563eb" }) ]); timeline := .Timeline.Sequence({= duration=2, entries=[{: frame, [1, 2] }] }); [.Renderer.Info("gif").Get("mime"), timeline];

Use .gif.Render(timeline) in a capable host or .Out("derivation.gif", timeline) with the CLI. The browser can inspect and preview the timeline but cannot spawn the PNG rasterizer or GIF encoder.

• Inputs: Slides, Timeline, or Snapshots with Graphic frames.
• Options: duration, delays, loop, width, height, scale, and

background.

• CLI tools: rsvg-convert or ImageMagick for PNG, then ImageMagick for GIF.

Keep useful output without an encoder

The same timeline can become a portable HTML contact sheet. Its assets include one SVG per retained frame plus exact state, caption/semantic tracks, timing, and coordinate/Scene3D evidence in JSON and text sidecars. Exact per-frame frameDurations are supported; GIF timing is recorded separately in integer centiseconds.

Runnable RiXRun cell

.Plugin.Load("gif"); frame := t -> .Figure(.Graphics.Graphic([160,60],[ .Graphics.Circle([10+140*t,30],5,{= fill="#2563eb" }) ]),"Exact trajectory sample","trajectory","A point on an exact trajectory"); timeline := .Timeline.Sequence({= entries=[{: frame,[0,1/3,1] }],frameDurations=[1/4,1/2,3/4] }); sheet := .Render(timeline,"gif-frames"); [sheet.Get("mime"),sheet.Get("metadata")];

Write this with .Out("frames.html",sheet). A successful GIF export writes the same retained SVG/JSON/text assets and a contact sheet next to the animation. Encoder-generated transitions remain display interpolation rather than extra certified states.