arrow on vertical line doesn't look vertical

Hi

I am plotting vertical lines with double arrow using this code (which is part of another code):

hc.Parent = hf.CurrentAxes;
hc.X = [1000*mm(row(ii)) 1000*case_res_straight_hyp(closestIndex_f_peak,3)];
hc.Y = [ffr_total_interp(row(ii),ii) case_res_straight_hyp(closestIndex_f_peak,4)];
diff_c(ii)=-ffr_total_interp(row(ii),ii)+case_res_straight_hyp(closestIndex_f_peak,4);
hc.Head1Style='plain';
hc.Head2Style='plain';
hc.Head1Length=10;
hc.Head2Length=10;
hc.Head1Width=10;
hc.Head2Width=10;
hc.LineWidth=1;
hc.LineStyle='--';

However, the arrows do not look vertical and inline, as (dashed vertical lines):

Can you please advise how to solve this issue? also I need the vertical lines (both solid lines and dashed line) to attach to arrows. I appreacite it if you could comment on this issue as well.

Thanks

Navid

[Steven Lord]

What is hc and how did you create it?

What are the contents of the variables you've used but not defined in your code?

[NaviD]

here is hc:

hc=annotation('doublearrow','color',C{ii});

and the variables are attached.

Thanks

Navid

Answer 1

[Voss]

You can get problems like those when the annotation is in an axes, which doesn't appear to be officially supported. Note that only figures, uipanels, and uitabs are listed as valid containers for an annotation:

https://www.mathworks.com/help/matlab/ref/annotation.html#br2_upx-1-container

You might have better luck using a function that is intended for making annotations in an axes, for instance this one from the File Exchange:

https://www.mathworks.com/matlabcentral/fileexchange/63760-annotate

An example usage follows.

X = [86 85];
Y = [0.85 0.96];

First, reproducing the problem, using the built-in annotation function in an unsupported manner:

hf = figure();
axes(hf,'XLim',[0 150],'YLim',[0.7 1]);

hc = annotation('doublearrow','color',[1 0 0]);
hc.Parent = hf.CurrentAxes;
hc.X = X;
hc.Y = Y;
hc.Head1Style='plain';
hc.Head2Style='plain';
hc.Head1Length=10;
hc.Head2Length=10;
hc.Head1Width=10;
hc.Head2Width=10;
hc.LineWidth=1;
hc.LineStyle='--';

Now, doing the same thing using the FEX submission Annotate:

hf = figure();
axes(hf,'XLim',[0 150],'YLim',[0.7 1]);

hc_obj = Annotate(hf.CurrentAxes,'doublearrow',X,Y,'Color',[1 0 0]);
hc = hc_obj.Primitive;
hc.Head1Style='plain';
hc.Head2Style='plain';
hc.Head1Length=10;
hc.Head2Length=10;
hc.Head1Width=10;
hc.Head2Width=10;
hc.LineWidth=1;
hc.LineStyle='--';