opencv circle
/** @brief Draws a circle. The function circle draws a simple or filled circle with a given center and radius. @param img Image where the circle is drawn. @param center Center of the circle. @param radius Radius of the circle. @param color Circle color. @param thickness Thickness of the circle outline, if positive. Negative thickness means that a filled circle is to be drawn. @param lineType Type of the circle boundary. See the line description. @param shift Number of fractional bits in the coordinates of the center and in the radius value. */ CV_EXPORTS_W void circle(InputOutputArray img, Point center, int radius, const Scalar& color, int thickness = 1, int lineType = LINE_8, int shift = 0);
void circle( InputOutputArray _img, Point center, int radius, const Scalar& color, int thickness, int line_type, int shift ) { CV_INSTRUMENT_REGION(); Mat img = _img.getMat(); if( line_type == CV_AA && img.depth() != CV_8U ) line_type = 8; CV_Assert( radius >= 0 && thickness <= MAX_THICKNESS && 0 <= shift && shift <= XY_SHIFT ); double buf[4]; scalarToRawData(color, buf, img.type(), 0); if( thickness > 1 || line_type != LINE_8 || shift > 0 ) { Point2l _center(center); int64 _radius(radius); _center.x <<= XY_SHIFT - shift; _center.y <<= XY_SHIFT - shift; _radius <<= XY_SHIFT - shift; EllipseEx( img, _center, Size2l(_radius, _radius), 0, 0, 360, buf, thickness, line_type ); } else Circle( img, center, radius, buf, thickness < 0 ); }
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