Circle

A full circle: bores, bosses, pins, and the guide circles other geometry is laid out on.

In the viewport

1. Click Circle on the sketch toolbar.
2. Click the centre. The X / Y pill places it exactly; a centre that snaps onto a vertex or the origin gets a coincident written for it.
3. Move out and click the rim — or type the diameter in the pill.

The code behind it

plate.part.js

import { sketch, circle, origin } from 'fluidcad/core';
import { coincident, concentric, diameter } from "fluidcad/constraints";

sketch("xy", () => {
    // A washer: an outer circle and the bore inside it. The inner loop
    // becomes a hole when the sketch is extruded.
    // circle(center, diameter) — the number is the diameter, not the radius.
    const outer = circle([0, 0], 50);
    const bore = circle([3, -2], 22);
    // Centre the washer on the origin and put the bore on the same centre;
    // the bore's guessed centre is off on purpose — the constraint fixes it.
    coincident(outer.center(), origin());
    concentric(bore, outer);
    diameter(outer, 50);
    diameter(bore, 22);
})

By hand

circle(center, diameter)

The number is the diameter, not the radius. The centre is a solver point; the diameter is a plain value until a diameter() or equal() constraint takes it over.

Accessors

Accessor	Meaning
c.center()	The centre point

The circle itself is a target for tangent, equal, concentric, diameter, radius, distance (measured to the circumference) and coincident(p, c) (a point on the circle).

Modifiers

circle([0, 0], 100).guide()        // construction circle — see Guides
circle([0, 0], 40).name('bore')    // name it for the timeline
circle([0, 0], 40).reusable()      // keep it after the sketch is consumed