Module plain 

Plane geometry in plain numbers: where a tool places what it builds, and where the pointer meets the sketch. Only ever a free choice — a position the solver then makes exact, a suggestion of which piece of a curve is meant — never a result the kernel reasons about: what the sketch is is its design data, and what that means comes from its solver.

Enums

Plain

A line, circle or arc in plain numbers: what intersections are found on, and where along it a point is.

Functions

add

angle_between

The counter-clockwise angle from a to b, in (-π, π].

bounds

The box around points: its lowest corner and its highest, or None if there are no points.

cross

The 2-D cross product a.x b.y - a.y b.x: positive where b lies counter-clockwise of a.

distance

How far a is from b.

dot

of

v in plain numbers.

perp

v turned a quarter counter-clockwise.

reflect

p mirrored across the line through a and b.

rotate

v turned counter-clockwise by angle.

scale

segments_cross

Where the segments from a to b and from c to d cross, if they do.

sub

sweep_through

The signed sweep of the arc from s to e through p, by the inscribed angle theorem: counter-clockwise (positive) when p lies right of the chord. Not finite when p is on the chord’s line.

swept

The angle from from round to to, followed on from previous, the sweep it was before (none if zero): within half a turn of it, so that a sweep dragged round goes on past half a turn.

unit

a scaled to unit length, or None if it has no finite, non-zero one.

wrap

angle brought into (-π, π].

xy

Where the sketch point p is drawn.

Type Aliases

P2

[x, y].