Contour

Vector graphics editor — the Illustrator analog and app #2 of the Prism creative suite (sibling to Pigment, the raster editor).

Built in Rust with eframe/egui 0.34 (glow backend). Vectors are drawn through egui's Painter — no custom GPU pass needed. Bezier path math runs on kurbo; the document serializes with serde.

Status — v0 scaffold

Real but scoped. It builds, launches, and lets you draw, select, move, style, and save shapes.

Implemented

• Document model — an ordered Vec<Shape> (Rect, Ellipse, Line, Path), bottom-up paint order (newest on top in the list).
• Canvas — artboard with cursor-anchored scroll zoom and drag/middle-drag pan; every shape repainted each frame via the egui painter.
• Tools (left palette): Select, Rectangle, Ellipse, Line, Pen.
  • Rect / Ellipse / Line: click-drag to create with the current fill + stroke.
  • Pen: click to append points; double-click or Enter closes/commits the path.
  • Select: click picks the topmost shape under the cursor (hit-test); drag moves it; Delete / Backspace removes it.
• Inspector (right panel): fill picker, stroke picker, stroke-width slider, and a shape list (select / delete, newest first).
• Menus: File (New, Save .contour → JSON via serde + rfd save dialog), Edit (Delete).

Out of scope for v0 (noted): undo/redo, true bezier handles (paths are straight-segment polylines for now — the kurbo::BezPath seam is already in place), open/import, multi-select, grouping, text.

Shared foundation

Contour depends on the suite's shared crate pigment-core by path (../pigment/crates/pigment-core) to demonstrate the shared-foundation model:

• pigment_core::Size — the logical artboard dimensions.
• pigment_core::color::{srgb_to_linear, linear_to_srgb} — at the color encode boundary.
• pigment_core::geometry::Rect — returned from Shape::bounds().

pigment-core declares [lints] workspace = true, so Contour's workspace mirrors Pigment's [workspace.lints] block; otherwise building it here errors on an undefined workspace.lints.

Build & run

# from prism/contour
cargo run        # launches the editor window
cargo build      # debug build
cargo fmt        # formatting (clean)
cargo clippy     # lints (clean)

Binary name: contour (crate contour-app).

Layout

contour/
├── Cargo.toml                  # workspace + shared lint config + pigment-core path dep
└── crates/contour-app/
    └── src/
        ├── main.rs             # eframe entry point
        ├── app.rs              # tool state, panels, menus, per-frame loop
        ├── canvas.rs           # pan/zoom transform + shape painting
        ├── document.rs         # Shape enum, Document, hit-testing, kurbo bounds
        ├── theme.rs            # Prism dark theme
        └── icons.rs            # egui-phosphor install + tool glyphs