cvCircle and cvRectangle

OpenCV 中的cvCircle和cvRectangle函数

void cvCircle(CvArr* img, CvPoint center, int radius, CvScalar color, int thickness=1, int lineType=8, int shift=0)

Draws a circle.

Parameters:

img – Image where the circle is drawn
center – Center of the circle
radius – Radius of the circle
color – Circle color
thickness – Thickness of the circle outline if positive, otherwise this indicates that a filled circle is to be drawn
lineType – Type of the circle boundary, see Line description
shift – Number of fractional bits in the center coordinates and radius value

The function draws a simple or filled circle with a given center and radius.

Rectangle

void cvRectangle(CvArr* img, CvPoint pt1, CvPoint pt2, CvScalar color, int thickness=1, int lineType=8, int shift=0)

Draws a simple, thick, or filled rectangle.

Parameters:

img – Image
pt1 – One of the rectangle’s vertices
pt2 – Opposite rectangle vertex
color – Line color (RGB) or brightness (grayscale image)
thickness – Thickness of lines that make up the rectangle. Negative values, e.g., CV_FILLED, cause the function to draw a filled rectangle.
lineType – Type of the line, see Line description
shift – Number of fractional bits in the point coordinates

The function draws a rectangle with two opposite corners pt1 and pt2.

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cvCircle and cvRectangle

OpenCV 中的cvCircle和cvRectangle函数

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