05 Draw Circle In Glyph With Direction.py

#MenuTitle: 05 Draw Circle In Glyph With Direction
from mojo.roboFont import CurrentGlyph

def draw_circle(pen, pt, diameter=50, clockwise=False, roundness=0.552):
    x, y = pt
    radius = 0.5 * diameter
    ctrl   = 0.5 * diameter * roundness

    factor = -1 if clockwise else 1

    points = [
        (
            (x + factor * ctrl,   y - radius),
            (x + factor * radius, y - ctrl),
            (x + factor * radius, y)
        ),
        (
            (x + factor * radius, y + ctrl),
            (x + factor * ctrl,   y + radius),
            (x,                   y + radius)
        ),
        (
            (x - factor * ctrl,   y + radius),
            (x - factor * radius, y + ctrl),
            (x - factor * radius, y)
        ),
        (
            (x - factor * radius, y - ctrl),
            (x - factor * ctrl,   y - radius),
            (x,                   y - radius)
        ),
    ]

    pen.moveTo((x, y - radius))

    for ctrl1, ctrl2, pt in points:
        pen.curveTo(ctrl1, ctrl2, pt)

    pen.closePath()


if __name__ == "__main__":
    g = CurrentGlyph()
    g.clear()
    p = g.getPen()
    rd = 0.7
    draw_circle(p, (275, 216), 400, False, rd)
    draw_circle(p, (275, 216), 300, True,  rd)
    draw_circle(p, (275, 216), 200, False, rd)
    draw_circle(p, (275, 216), 100, True,  rd)