Swept profile box

Let's say you want to start designing with a box. Simple extrusion is good if you do not have a complex profile. A way to work with a more complex shape is to draw the profile in 2D, and then sweep it along a base sketch.

const { makeSolid, makeFace, assembleWire, EdgeFinder, genericSweep, Plane } =
  replicad;

function profileBox(inputProfile, base) {
  const start = inputProfile.blueprint.firstPoint;
  const profile = inputProfile.translate(-start[0], -start[1]);

  const end = profile.blueprint.lastPoint;

  const baseSketch = base.sketchOnPlane();

  // We create the side of the box
  const side = baseSketch.clone().sweepSketch(
    (plane) => {
      return profile.sketchOnPlane(plane);
    },
    {
      withContact: true,
    }
  );

  // We put all the pieces together
  return makeSolid([
    side,
    // The face generated by sweeping the end of the profile
    makeFace(assembleWire(new EdgeFinder().inPlane("XY", end[1]).find(side))),
    // The face generated by the base
    baseSketch.face(),
  ]);
}

This code assumes some things about its input:

• the input profile is a single open line
• the base is a single closed line
• there is only one profile point at the coordinate of the end of the profile

The box will have its base in the XY plane.

Let's build an example

const { makeSolid, makeFace, assembleWire, EdgeFinder, genericSweep, Plane } =
  replicad;

function profileBox(inputProfile, base) {
  const start = inputProfile.blueprint.firstPoint;
  const profile = inputProfile.translate(-start[0], -start[1]);

  const end = profile.blueprint.lastPoint;

  const baseSketch = base.sketchOnPlane();

  // We create the side of the box
  const side = baseSketch.clone().sweepSketch(
    (plane) => {
      return profile.sketchOnPlane(plane);
    },
    {
      withContact: true,
    }
  );

  // We put all the pieces together
  return makeSolid([
    side,
    // The face generated by sweeping the end of the profile
    makeFace(assembleWire(new EdgeFinder().inPlane("XY", end[1]).find(side))),
    // The face generated by the base
    baseSketch.face(),
  ]);
}

const { draw, drawRoundedRectangle } = replicad;

function main() {
  const base = drawRoundedRectangle(30, 20, 5);

  const profile = draw()
    .line(5, 5)
    .line(2, 3)
    .hLine(-2)
    .vLine(-1)
    .bulgeArcTo([0, 1], 0.2)
    .done();

  return profileBox(profile, base);
}