hyperframes/registry/components/morph-swap/README.md

morph-swap

Two slotted siblings sit absolutely stacked at one shared center. A holds alone, then at swap_at it morphs into B through one of two registers, both on a shared 50% 50% transform origin:

• condense: A shrink-fades toward center exactly as B scales up through the same silhouette (outgoing power2.in, incoming back.out with a 0.15s overlap).
• reshape: A morphs its silhouette on scaleX/scaleY while fading, and B picks up from that mid-morph silhouette and relaxes to its natural shape. The reshape rides transforms only, never width/height tweens, so it stays layout-free and seek-safe.

You supply the two visuals through slots; the primitive supplies the morph.

Files

• morph-swap.html: the mountable sub-composition (install target: compositions/components/morph-swap.html).
• registry-item.json: registry metadata and the variables block.
• demo.html: a 1920x1080 host that mounts the primitive with non-default variables (reshape register, violet accent).

Variables

id	type	default	notes
swap_at	number	1.4	seconds after mount start when the morph begins (0.1 to 8)
register	enum	condense	condense shrink-fades at center; reshape morphs on scaleX/scaleY
accent	enum	green	green maps to --brand, blue to --accent, violet to --accent-2
exit	enum	none	none holds the final frame; fade and up release the stage

Envelope: IN = swap_at + the swap span (0.75s condense, 1.05s reshape), OUT = 0.5s only when exit is fade or up, HOLD is the sole elastic phase. The morph-land sync point (hf:sfx id morph-land-soft) fires when the morph lands, 2.15s at defaults.

The slot mechanism

The primitive ships two named slot panels inside its <template>:

<div class="msw-slot" data-slot="a">...</div>
<div class="msw-slot" data-slot="b">...</div>

Each slot's default children are a token-styled card (a muted wireframe on the outgoing side, a taller accent-tinted card on the incoming side), so an untouched mount still reads as a deliberate morph. To show your own content, install the component and replace the children of each [data-slot] element in your installed copy (the runtime clones only the primitive's own template on mount, so slot content lives in the component file, not on the host clip).

Rules:

• Both slots center their content in one shared coordinate space; the morph reads best when A and B have visibly different silhouettes.
• Direct img/video children are capped at 84cqw by 84cqh and rounded with --radius. Arbitrary HTML works too; size it in cqw/cqh.
• The morph transforms the panel around the slot, so slot content needs no animation of its own; keep it static.

Worked example

Install, then fill the slots with two visuals:

npx hyperframes add morph-swap

In compositions/components/morph-swap.html, replace each slot's default block:

<div class="msw-slot" data-slot="a">
  <img src="../../assets/logo-mark.png" alt="" />
</div>
...
<div class="msw-slot" data-slot="b">
  <img src="../../assets/cta-pill.png" alt="" />
</div>

Mount it from a host composition like any sub-composition:

<div
  class="clip"
  data-composition-id="morph-swap"
  data-composition-src="./components/morph-swap.html"
  data-variable-values='{"register":"reshape","swap_at":1.0,"accent":"blue"}'
  data-start="2"
  data-duration="4"
  data-track-index="0"
></div>

A holds for the first second, reshapes into B, and B holds still for the rest of the clip window (exit defaults to none; frame roots own scene transitions).