Canvas Card Shapes

Give Canvas cards a shape — from basic geometry to the symbols used in flowcharts and programming-logic diagrams. Stock Canvas has exactly one shape: a rectangle.

• Right-click a card → 卡片形状 → pick a shape (the one in effect is ticked).
• Select several cards, then right-click → one shape for all of them.
• Command palette → 卡片形状: diamond and friends, applied to the selection.

What you get

The flowchart group is the standard set for programming-logic diagrams: decision as a diamond, input/output as a parallelogram, storage as a cylinder, start/end as a capsule — so you do not have to fake shapes with styled rectangles.

Three deliberate trade-offs

1. Rounded shapes keep their border; clipped shapes do not. Rounded / pill / ellipse / cloud / document / database / delay are done with border-radius, so the card's own border follows the curve and stays visible. Diamond / hexagon / parallelogram / triangle / star / folded note are cut with clip-path, and CSS clipping can cut a shape but cannot stroke it — a border would need two stacked elements, which breaks Obsidian's selection box and dragging. Not worth it. Clipped shapes get a shape-following filter: drop-shadow() outline instead, and turn into an accent-coloured glow when selected (the native rectangular selection ring is clipped away, so it would otherwise be invisible). One trap here: per the CSS spec filter is applied before clip-path, so putting both on the same element clips the shadow away entirely. The shadow therefore sits on the card frame, and the clipping on a layer inside it.

2. Text is vertically centred. Obsidian lays card text out flush to the top; on a diamond, triangle or star — shapes that are narrow at the top — that puts the text exactly where there is no room, and it gets cut in half. The cause is that Obsidian's own text block eats all the leftover height (leaving exactly one 16 px spacer above it). The plugin flips that around: the text block stops taking the slack and the two spacers split it, so the text lands in the middle of the shape. When the text is too tall to fit, the spacers shrink to zero and it simply starts at the top, so the beginning is never cropped.

3. Shapes are stored in the plugin's own data file, never in the .canvas. The canvas file stays standard JSON Canvas — no private fields for other tools or other machines to trip over. The cost: uninstalling the plugin loses the shapes. This is the same trade-off the companion Canvas Node Align makes.

Settings

• Padding — the space between text and the card edge. Shapes with small usable areas (diamond, triangle) add extra on top of it; enlarging the card helps more than reducing the padding.

Known limitations

• Shapes do not resize the card, and they do not move connection points. Edges still anchor to the card's rectangular bounding box, so a line into a diamond meets it near a corner — that is how Canvas draws edges.
• Text is laid out as a rectangle and then clipped, not flowed along the shape. In extreme cases (very flat card, long text) a little can be cut off — make the card bigger.
• Image cards and embedded notes can take a shape, but a clipped shape on an image may not look like what you hoped. Groups do not take a shape — a group is the container that holds other cards, so clipping it would hide them; the plugin excludes it on purpose.

Related plugins

• Canvas Node Align — text alignment (horizontal and vertical) for cards and labels; designed to work alongside this one.
• Advanced Canvas also ships flowchart node styles. This plugin adds the decorative set (star, cloud, folded note, octagon…), Chinese menus, and padding that coexists with text alignment. Use whichever fits; they do not conflict.

Install

Community plugins → search for Canvas Card Shapes (after the directory review), or copy main.js, manifest.json and styles.css into <vault>/.obsidian/plugins/canvas-card-shapes/ and enable it in Settings → Community plugins.

Development

main.js              shape table + menus + commands + the re-apply mechanism
styles.css           one rule per shape (radius / clip-path / padding)
test/shapes.test.js  332 assertions: shape-table contract, data keys, apply/read
                     class names, a two-way stylesheet guard, wiring guards
test/build.test.mjs  tests the release tooling itself

npm test          # both test files
npm run build     # the same command the community directory runs
npm run verify    # metadata + build + tests

Privacy

No network access, no telemetry, no reading of note contents. It does exactly two things: puts a class name on a card element, and records one line in the plugin's data file.

License

MIT