player_methods.py 文件源码

def transparent_circle(img,center,radius,color,thickness):
    center = tuple(map(int,center))
    rgb = [255*c for c in color[:3]] # convert to 0-255 scale for OpenCV
    alpha = color[-1]
    radius = int(radius)
    if thickness > 0:
        pad = radius + 2 + thickness
    else:
        pad = radius + 3
    roi = slice(center[1]-pad,center[1]+pad),slice(center[0]-pad,center[0]+pad)

    try:
        overlay = img[roi].copy()
        cv2.circle(img,center,radius,rgb, thickness=thickness, lineType=cv2.LINE_AA)
        opacity = alpha
        cv2.addWeighted(src1=img[roi], alpha=opacity, src2=overlay, beta=1. - opacity, gamma=0, dst=img[roi])
    except:
        logger.debug("transparent_circle would have been partially outside of img. Did not draw it.")