`Rect`

Rect is an axis-aligned rectangle. Drawn rectangles from rect and construction rectangles from crect both have this type.

Fields

Field	Type	Description
`x0`	`Float`	Left edge.
`y0`	`Float`	Bottom edge.
`x1`	`Float`	Right edge.
`y1`	`Float`	Top edge.
`w`	`Float`	Width, x1 - x0.
`h`	`Float`	Height, y1 - y0.
`layer`	`String`	Layer name. A construction rectangle may have none.

Give any combination of edges and sizes that pins the rectangle down, and the solver derives the rest:

let r = rect("met1", x0=10., y0=20., w=100., h=80.);
eq(r.x1, 110.);
eq(r.y1, 100.);

Arguments such as x0 are constraints. Arguments such as x0i are initial values for whatever is left free.