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All types export from the root module.

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Point

const geo = @import("otter_geo");

const p1 = geo.Point{ .x = 10, .y = 20 };
const p2 = geo.Point{ .x = 5, .y = 10 };
const sum = p1.add(p2);
const bounds = p1.spanningRect(p2);

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Rect

const rect = geo.Rect{ .x = 0, .y = 0, .width = 100, .height = 100 };
const centered = rect.center(geo.Point{ .x = 20, .y = 20 });

if (rect.intersection(other)) |inter| {
    _ = inter;
}

if (rect.removePadding(geo.Padding.uniform(10))) |inner| {
    _ = inner;
}
Common helpers: containsPoint, containsRect, inset, offset, clipTo.

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Circle

const circle = geo.Circle.largestCircle(rect);
if (circle.containsPoint(p1)) { }

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Padding

Four-sided inset: north, south, east, west. Padding.uniform(n) sets all sides.

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Align

Align enum: start, center, end. Used by otter-ui LayoutSpec for child alignment in flex containers.

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Transform

2D rotation and composition with i32 fixed-point matrix math. 
const rotated = geo.Transform.rotate_cw;
const combined = geo.Transform.identity.compose(rotated);
Use for icon rotation and surface transforms where floats would complicate damage tracking.