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Merge pull request #8620 from saskatchewancatch:8457

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Alexander Alekhin 2017-04-25 12:22:51 +00:00
commit 41d55c5095
1 changed files with 4 additions and 3 deletions
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modules/imgproc/include/opencv2/imgproc.hpp
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@ -4220,13 +4220,14 @@ CV_EXPORTS_W void circle(InputOutputArray img, Point center, int radius,
/** @brief Draws a simple or thick elliptic arc or fills an ellipse sector.
The function cv::ellipse with less parameters draws an ellipse outline, a filled ellipse, an elliptic
The function cv::ellipse with more parameters draws an ellipse outline, a filled ellipse, an elliptic
arc, or a filled ellipse sector. The drawing code uses general parametric form.
A piecewise-linear curve is used to approximate the elliptic arc
boundary. If you need more control of the ellipse rendering, you can retrieve the curve using
cv::ellipse2Poly and then render it with polylines or fill it with cv::fillPoly. If you use the first
variant of the function and want to draw the whole ellipse, not an arc, pass `startAngle=0` and
`endAngle=360`. The figure below explains the meaning of the parameters to draw the blue arc.
`endAngle=360`. If `startAngle` is greater than `endAngle`, they are swapped. The figure below explains
the meaning of the parameters to draw the blue arc.
![Parameters of Elliptic Arc](pics/ellipse.svg)
@ -4468,7 +4469,7 @@ CV_EXPORTS_W bool clipLine(Rect imgRect, CV_OUT CV_IN_OUT Point& pt1, CV_OUT CV_
/** @brief Approximates an elliptic arc with a polyline.
The function ellipse2Poly computes the vertices of a polyline that approximates the specified
elliptic arc. It is used by cv::ellipse.
elliptic arc. It is used by cv::ellipse. If `arcStart` is greater than `arcEnd`, they are swapped.
@param center Center of the arc.
@param axes Half of the size of the ellipse main axes. See the ellipse for details.