Example on how to show a given letter’s off-curve points in DrawBot

lemonvetica.py

# it’s easy to access a letter’s contours through a BezierPath object:
bp = BezierPath()
bp.text(
    's',
    font='SFProDisplay-Heavy',
    fontSize=1200)

# Fill the letter, and offset the whole canvas so it sits in the middle.
fill(1, 1, 0)
letter_width = bp.bounds()[-2] - bp.bounds()[0]
x_offset = (width() - letter_width) / 2
translate(x_offset, 160)
drawPath(bp)


previous_oncurve = None
# draw the lines

lineDash(5)
stroke(0)
strokeWidth(3)

# go through the contours:
for contour in bp:
    for segment in contour:
        if len(segment) == 3:
            # this is a curveTo. Draw the lines.
            offcurve_1, offcurve_2, oncurve = segment
            line(previous_oncurve, offcurve_1)
            line(offcurve_2, oncurve)
        else:
            # it is a lineTo. No drawing needed here.
            oncurve = segment[-1]
            
        previous_oncurve = oncurve

# offset everything a bit lower, because the lemons sit
# on the baseline
translate(0, -10)

# draw the lemons, same way as we’ve been drawing the contours:  
# size of lemons:
fontSize(35)
for contour in bp:
    for segment in contour:
        if len(segment) == 3:
            offcurve_1, offcurve_2, oncurve = segment
            text('🍊', offcurve_1, align='center')
            text('🍊', offcurve_2, align='center')
        else:
            oncurve = segment[-1]

        text('🍋', oncurve, align='center')
        previous_oncurve = oncurve

saveImage('~/Desktop/lemon.png')