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As per the up-to-date documentation (@docs.opencv.org) the drawing functions are located in the core module.
So please look at its javadoc, in particular:
circle: http://docs.opencv.org/java/org/opencv/core/Core.html#circle(org.opencv.core.Mat, org.opencv.core.Point, int, org.opencv.core.Scalar)
rectangle: http://docs.opencv.org/java/org/opencv/core/Core.html#rectangle(org.opencv.core.Mat, org.opencv.core.Point, org.opencv.core.Point, org.opencv.core.Scalar)
line: http://docs.opencv.org/java/org/opencv/core/Core.html#line(org.opencv.core.Mat, org.opencv.core.Point, org.opencv.core.Point, org.opencv.core.Scalar)
