Draw breaklines(dotted line/dashed line) in Opencv

Question

How to add breakline(dotted line/dashed line) in OpenCV drawing functions like cv2.line(),cv2.rectangle() ?

Is there a line type for break lines?

What do you mean "break lines" ? Maybe read OpenCV documentation. — furas, Oct 29 '16 at 15:03
@userblock25 So why don't you go and update your question, rather than leaving this misleading text in there? — Dan Mašek, Oct 29 '16 at 20:40
@DanMašek don it..but break lines is a correct word in Engineering drawing — user119o, Oct 31 '16 at 16:23
@userblock25 Oh, you mean "[breaklines](https://www.google.com/search?q=breaklines)" (one word). That explains it :) — Dan Mašek, Oct 31 '16 at 16:33
Possible duplicate of [opencv rectangle with dotted or dashed lines](https://stackoverflow.com/questions/26690932/opencv-rectangle-with-dotted-or-dashed-lines) — Yohai Devir, Nov 07 '17 at 09:27

score 1 · Answer 1 · answered Jul 13 '22 at 18:23

If the line is horizontal or vertical, you can do something like this. Kind of hacky, but gets the job done in just a few lines if you don't need anything fancy.

y = 100  # vertical position of the line
thickness = 2  # thickness of the line
x0 = 0  # leftmost part of the line
x1 = img.shape[1]  # rightmost part of the line
on_time = 10  # pixels out of period that are solid
period = 20  # period between dashes
colour = (0, 0, 255)
img[
    y - thickness // 2:y + thickness // 2,
    [x for x in range(x0, x1) if x % period < on_time]
] = colour

Draw breaklines(dotted line/dashed line) in Opencv

1 Answers1