mirror/opencv
1
0
Fork 0
mirror of https://github.com/opencv/opencv.git synced 2024-11-25 03:30:34 +08:00
Code Issues Actions Packages Projects Releases Wiki Activity

Merge pull request #8620 from saskatchewancatch:8457

Browse Source
This commit is contained in:
Alexander Alekhin 2017-04-25 12:22:51 +00:00
commit 41d55c5095
1 changed files with 4 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
modules/imgproc/include/opencv2/imgproc.hpp
View File

@ -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. /** @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. arc, or a filled ellipse sector. The drawing code uses general parametric form.
A piecewise-linear curve is used to approximate the elliptic arc 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 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 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 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) ![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. /** @brief Approximates an elliptic arc with a polyline.
The function ellipse2Poly computes the vertices of a polyline that approximates the specified 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 center Center of the arc.
@param axes Half of the size of the ellipse main axes. See the ellipse for details. @param axes Half of the size of the ellipse main axes. See the ellipse for details.