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Is it possible to draw half circle?

asked 2014-04-05 08:59:05 -0600

gunslinger_ gravatar image

updated 2020-10-21 13:03:52 -0600

Simple question. Is it possible to draw half circle in OpenCV? If not, how can I do this especially in Python?

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answered 2014-04-05 11:47:58 -0600

Haris gravatar image

I have'nt tested it but I think it will work, instead of circle draw ellipse() but need to adjust the parameters, like

center=your half circle centre
axes = Size(radius ,radius);
angle=0;
startAngle=0;
endAngle=180;

Now draw ellipse like,

ellipse(img,Point(centX,centY), Size(radius,radiua),0,0,180, Scalar(0,0,255), 2, 8,0);

You can change start angle and stop angle and draw different area you need.

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answered 2016-12-19 05:20:35 -0600

Soltius gravatar image

Great answer ! Just a small addition since the question was asked for Python, in case any Python user come by (also, this is a full working example)

import cv2
import numpy

img=numpy.zeros((100,100))

radius=5
axes = (radius,radius)
angle=0;
startAngle=0;
endAngle=180;
center=(50,50)
color=255

cv2.ellipse(img, center, axes, angle, startAngle, endAngle, color)
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Asked: 2014-04-05 08:59:05 -0600

Seen: 8,216 times

Last updated: Dec 19 '16