Your First Sketch

Sketch structure

Every sketch is a standalone Rust binary with two parts:

1. main() — configure the window (like Processing’s setup()).
2. draw() — called every frame.

use oripop_canvas::prelude::*;

fn main() {
    size(800, 600);
    title("my sketch");
    smooth(4);
    run(draw);
}

fn draw() {
    background(20, 20, 30);
    stroke(255, 200, 100);
    stroke_weight(3.0);
    line(100.0, 100.0, 700.0, 500.0);
}

Adding a new sketch

1. Create sketches/my-sketch.rs with fn main().
2. Add a [[bin]] entry in sketches/Cargo.toml:

[[bin]]
name = "my-sketch"
path = "my-sketch.rs"

3. Run it:

cargo run -p sketches --bin my-sketch

Coordinate system

• Origin is top-left (0, 0).
• x grows to the right.
• y grows downward.
• All values are in logical pixels (DPI-independent).