scan-context/src2/example/longterm_localization/NCLT/2012-01-15/1_DataMaker/helper/getThetaFromXY.m

function [ theta ] = getThetaFromXY( x, y )

    if (x >= 0 && y >= 0) 
        theta = 180/pi * atan(y/x);
    end
    if (x < 0 && y >= 0) 
        theta = 180 - ((180/pi) * atan(y/(-x)));
    end
    if (x < 0 && y < 0) 
        theta = 180 + ((180/pi) * atan(y/x));
    end
    if ( x >= 0 && y < 0)
        theta = 360 - ((180/pi) * atan((-y)/x));
    end

end