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Angle

angle holds the angle between two lines, in degrees. Against a sketch axis it sets a line's absolute slope; between two sketched lines it sets their relative opening.

In the viewport​

  1. Click two lines.
  2. Click Angle. An arc appears in the sector between the lines; move the cursor to choose which of the four sectors to dimension, then click.
  3. Type the value in degrees and press Enter.
The constraint bar with two lines picked and the Angle button highlighted
Two lines picked: Angle is enabled.
BeforeBefore mode

The ramp is drawn at 45° to the flat.

AfterAfter modeangle(flat, ramp, 30)

The ramp held at 30° from the flat.

The code behind it

angle(flat, ramp, 30) measures counter-clockwise from flat to ramp (1 DOF). The distance on the ramp sets its length; the two share a start through coincident.

ramp.part.js
import { sketch, line } from 'fluidcad/core';
import { coincident, horizontal, fix, distance, angle } from "fluidcad/constraints";

sketch("xy", () => {
    const flat = line([0, 0], [100, 0]);
    const ramp = line([0, 0], [60, 60]);
    coincident(flat.start(), ramp.start());
    horizontal(flat);
    fix(flat.start());
    distance(flat.start(), flat.end(), 100);
    angle(flat, ramp, 30);
    distance(ramp.start(), ramp.end(), 90);
})

In code​

angle(a, b, 30)                  // counter-clockwise from a to b, 0 ≤ deg < 360: 1 DOF
angle(xAxis(), ramp, 30)         // against the horizontal
angle(l1, l2.start(), 45)        // orient l2 toward its start instead of its end

Each argument is a line, optionally pointed at one of its ends with .start() / .end(); a bare line points at its end. There are no negative angles — a clockwise angle is the counter-clockwise angle of the swapped pair, angle(b, a, 30). The UI picks the arguments and their orientation from the sector you clicked, so the written statement always carries a positive value.

See also​