A title typed as "TEST" on a title slide and on a content slide pairs
the two titles, but they differ in placeholder, size and alignment, so
Morph with the default Objects option cross-faded them: the old title
rose and faded out while the new one faded in.
Paired shapes whose text is the same now use the word morph (shared
words travel and resize from their old place to their new one) whatever
the Morph option, as PowerPoint does. Different texts still cross-fade
with Objects.
Co-authored-by: Cursor <cursoragent@cursor.com>
Two paired pictures that differed only in crop counted as changed
content, so the new one faded in over the old one on the moving box.
Now they stay one picture whose crop morphs: the whole image moves and
scales linearly between where it lies on either slide, and each frame's
crop is what the interpolated box shows of it (morph_crop).
generated with Claude Code
The last matching pass paired any two shapes of one kind and preset
geometry, so a text box leaving the slide was paired with an unrelated
one arriving and flew across to it. That pass now only pairs shapes
without text: a text box needs its name or its text on the other slide
to morph, otherwise it fades out (or in) where it is, as in PowerPoint.
generated with Claude Code
* Morph: a changed geometry morphs its outline (a circle turns into a star)
Paired shapes that differ only in geometry (another preset, other adjust
values, a custom path) and fill colour no longer cross-fade: one shape moves
and its outline turns from the old geometry into the new one.
- geom::morph aligns two outlines the way manim does: the same number of
contours, the same number of cubic curves per contour pair, then every
point moves in a straight line. Closed contours are turned and reversed so
the points travel least (a triangle does not twist into a circle), extra
points go to the longest curves, and a sub-path without partner grows out
of (or shrinks into) a point, so a cube's faces appear and a donut's hole
closes. Fill mode, outline and fill rule switch at the midpoint.
- anim::morph_frame lists such shapes in MorphFrame::paths; the renderer
draws them with the morphed geometry (PathMorph, a new render_blend
argument next to TextMorph).
Ported from the path morph in alexplain (MIT, same author).
generated with Claude Code
* Morph: differing looks of an outline cross-fade instead of switching
When a sub-path pair differs in fill mode, outline or fill rule, the two
looks no longer switch at the midpoint. A fill or outline only one side has
fades out (or in), so a filled shape turning into a line loses its fill
gradually. When both fill, the even-odd side lies opaque underneath and the
other fades over it, so a donut's hole fills smoothly while it shrinks.
generated with Claude Code
---------
Co-authored-by: Brandon Thomas <echelon@gmail.com>
* Morph: shapes move, resize and blend in the slide show
Morph used to fall back to a plain crossfade in the show: morph_pairs and
morph_xfrm existed, but nothing rendered frames with them.
- anim: morph_frame builds a frame from two slides. Paired shapes move along
morph_xfrm (eased); a pure fill colour change blends, other content changes
cross-fade on the same moving box. Unpaired shapes fade out/in, shapes with
entrance animations or hidden media stay out of the frame.
- render: render_blend draws such a frame in one pass: both backdrops
(background, master and layout graphics) cross-fade, every shape resolves
against the slide it comes from, so placeholders keep their own layout.
Renderer::slide is split into canvas/fields/backdrop to share the code.
- ui-egui: the show renders morph frames with these, crossfade otherwise.
generated with Claude Code
* Contributors: add my own entry (alexanderalber)
generated with Claude Code
* Morph: Words and Characters options morph text token by token
The transition option (objects/words/characters) was stored and round-tripped
but ignored by the show. With Words or Characters, paired shapes whose text
differs now morph their text instead of cross-fading it:
- text: GlyphRun records per glyph the paragraph character it draws, so
glyphs can be grouped into words or characters.
- anim: morph_frame reads the option and lists such pairs in MorphFrame::text.
- render: morph_text draws them. Shared words (or characters) travel from their
place in the old text to their place in the new one and grow or shrink to the
new size; a different look cross-fades on the way. The remaining tokens fade
while following a scale and shift fitted to the shared ones, so a line moves
and rearranges as one. Rotated text falls back to a cross-fade.
draw_layout_with's glyph drawing moved into draw_glyph for reuse.
- ui-egui: the show passes the pairs to render_blend.
generated with Claude Code
---------
Co-authored-by: Brandon Thomas <echelon@gmail.com>
Brandon Thomas