fix(graph): fallback for missing the image toolbox

[ocehugo]

This fix a distribution/compatibility problem related to the drawrectangle function which is exclusive of the image processing toolbox.

The fix provide a fallback to the old functionality in the case the toolbox is not installed/available.

@BecCowley

[sspagnol]

Can the logic be pushed to select_points function, eg call in checkMooringPlannedDepths.m is just

    %select the area to use for comparison
    [x, ~] = select_points(hAxPress);

And select_points.m is now something like

function [x,y] = select_points(hAx)
%function [x,y] = select_points
% Uses drawrectangle/rbbox to select points in the timeseries chart for flagging.
% Returns [x,y] - index of rectangle corners in figure units

%select the area to use for comparison
if license('test','Image_Toolbox')
    rec = drawrectangle(hAx);
    x = [rec.Position(1) rec.Position(1)+rec.Position(3)];
    y = [rec.Position(2) rec.Position(2)+rec.Position(4)];
    delete(rec);
else
    axes(hAx);
    k = waitforbuttonpress;
    point1 = get(gca,'CurrentPoint');    % button down detected
    finalRect = rbbox;                   % return figure units
    point2 = get(gca,'CurrentPoint');    % button up detected
    point1 = point1(1,1:2);              % extract x and y
    point2 = point2(1,1:2);
    p1 = min(point1,point2);             % calculate locations
    offset = abs(point1-point2);         % and dimensions
    x = [p1(1) p1(1)+offset(1) p1(1)+offset(1) p1(1) p1(1)];
    y = [p1(2) p1(2) p1(2)+offset(2) p1(2)+offset(2) p1(2)];
    hold('on');
    axis('manual');
    plot(x,y);                            % redraw in dataspace units
end

end

This was my temporary workaround, and done this way so could use select_points.m in other code and not run into the same issue.

[ocehugo]

yeap, even better

[BecCowley]

@ocehugo , either looks good to me. I tested @sspagnol's solution and it worked well.

[ocehugo]

Thanks @BecCowley.

FYI: This is waiting here because I need to test this bit on the stand-alone binaries

[ocehugo]

@sspagnol - I rebased the fix. @lbesnard - this is ready for review.