How to change fontsize of label on freehand object using drawfreehand?

Hello! I am writing a script that makes the user draw a freehand object, then prompts them for a number, and finally attaches that number onto the produced ROI as a visible label. The currently generated label is nice but I was hoping to increase the fontsize to make it more visible on a screen. Is there a good way to do this? Thank you very much!

Below, I have included an executable sample of what I'm working with at the moment.

% Initiate drawfreehand function
Drawing = drawfreehand("Color","r", "LabelAlpha",1);

% Prompt User
prompt = "What value?\n";
Value = input(prompt);

% Set the freehand object's label
Drawing.Label = num2str(Value);

[Dylan Zhu]

Got it, thank you so much! Yeah I pored over the documentation for ages trying to find a solution, Yair's code seems promising and I will definitely give it a look!

TMW for The Math Works? Sorry I'm unfamiliar with the acronym but I agree that I wish there was more available customizability akin to more primitive objects. Regardless, thank you for the help once again!

Edit: I'm not sure why but I can't seem to mark your answer with an "Accept this Answer," I'll keep trying and update if I figure it out. Sorry about that.

[dpb]

You can't Accept because I wrote it as a comment...I guess it really is the answer for this case despite the editorial comment; I'll go ahead and move it over.

Yes, I have used "TMW" as shorthand for "The Mathworks" for ages...

[dpb]

There's no guarantee getundoc will find it, but it's the best tool out there for the purpose by far. As TMW gets more and more into this thing of building these custom objects, digging into their bowels gets harder and harder as well. It's misguided direction to pursue imo, but they're apparently totally committed down the path of making everything a "mother knows best!" solution, taking away the user's opportunity to do something other than what they've thought of and generously provided...

Answer 1

[dpb]

<drawfreehand> doesn't show that it exposes the FontSize property of the text object. Best you can do will be to save the object handle and <use Yair Altman's utility> to see if you can find it or the handle to the text object as a hidden property.

It is SO FRUSTRATING that TMW has started this thing about creating specialized graphics objects that are semi-opaque (or nearly black in some instances) instead of just creating the same effect as regular axes object so the user can make desired customizations.

[Dylan Zhu]

For anyone in the future, the code to use is below btw:

YourFreehandObj.Font.Size = newFontSize;

[dpb]

Were you able to find the text object handle itself?

Might be useful to just post the returned structure; anybody who searched for similar topic might find it useful extra documentation...

[Dylan Zhu]

Yeah good point, I've put what getundoc returned below. When you say the text object handle I'm honestly not entirely sure I know what you're talking about, do you know if you see that within the structure I've pasted below?

Below is the returned structure from calling getundoc() on a freehand object drawn by drawfreehand:

                               ALimInclude: on
                           ALimIncludeMode: 'auto'
                             AlphaInternal: 1
                           ApplicationData: [1×1 struct]
                                 BackPoint: 1
                             ButtonDownEvt: [1×1 event.listener]
                           ButtonMotionEvt: [1×1 event.listener]
                            ButtonStartEvt: [1×1 event.listener]
                               ButtonUpEvt: [1×1 event.listener]
                                     CData: []
                               CLimInclude: on
                           CLimIncludeMode: 'auto'
                            CachedPosition: []
                                    Canvas: [0×0 Quadrilateral]
                              ChildrenMode: 'auto'
                            ClosedInternal: 1
                             ColorInternal: [0 0.4470 0.7410]
                       ConstrainedInternal: 1
                       ContextMenuListener: []
                                  Copyable: 1
                              CurrentPoint: [0.8059 0.8766]
                           CurrentPointIdx: []
                   DataUnitsPerScreenPixel: [8.9286e-05 1.1905e-04]
                   DefaultPropMap_Internal: [0×0 struct]
                         DeletableInternal: 1
                               Description: ''
                           DescriptionMode: 'auto'
                            DimensionNames: {'X'  'Y'  'Z'}
                        DimensionNamesMode: 'auto'
                           DragButtonUpEvt: []
                            DragConstraint: []
                             DragMotionEvt: [1×1 event.listener]
                         DraggableInternal: 1
                       DrawingAreaInternal: []
                                      Edge: [1×1 LineStrip]
                                 EdgeColor: [0 0.4470 0.7410]
                         EdgeColorInternal: 'none'
                              EdgeListener: [1×1 event.listener]
                             ErrorCallback: ''
                         ErrorCallbackMode: 'auto'
                              EscapeKeyEvt: [1×1 event.listener]
                         FaceAlphaInternal: 0.2000
                    FaceSelectableInternal: 1
                              FigureHandle: [1×1 Figure]
                        FigureModeListener: []
                                      Fill: [1×1 TriangleStrip]
                              FillListener: [1×1 event.listener]
                          FilterStartIndex: 1
                                      Font: [1×1 matlab.graphics.general.Font]
                      HandleVisibilityMode: 'auto'
                              HasNewParent: 0
                                  Internal: 0
                               KeyPressEvt: [1×1 event.listener]
                             KeyReleaseEvt: [1×1 event.listener]
                        LabelAlphaInternal: 1
                               LabelHandle: [1×1 Text]
                             LabelInternal: ''
                             LabelListener: [1×1 event.listener]
                             LabelLocation: 'firstvertex'
                     LabelLocationInternal: 'firstvertex'
                    LabelTextColorInternal: []
                LabelVisibleInsideInternal: 0
                      LabelVisibleInternal: 1
               LabelVisibleOnHoverInternal: 0
                         LineWidthInternal: 3
                        MarkerSizeInternal: 8
                            MarkersVisible: 'on'
                    MarkersVisibleInternal: 1
             MarkersVisibleOnHoverInternal: 0
                                  MouseHit: 0
                        MulticlickInternal: 0
                              NodeChildren: [8×1 Graphics]
                                NodeParent: [1×1 ClipNode]
                                 NumPoints: 0
                                ParentMode: 'manual'
                                     Point: [1×4 Marker]
                             PointListener: [1×4 event.listener]
                        PositionConstraint: [0 1 0 1]
                          PositionInternal: [28×2 double]
                    ROIIsUnderConstruction: 0
                        ReshapableInternal: 1
                            ScrollWheelEvt: []
                     SelectedColorInternal: 'none'
                          SelectedInternal: 0
                              Serializable: on
               SerializableApplicationData: [1×1 struct]
                          SerializableMode: 'auto'
                      SerializableUserData: []
                             SigmaInternal: 1
                         SkipFaceRendering: 0
                        SnapAngleIncrement: 15
                       SnapToAngleInternal: 0
                                StartPoint: [0×0 Marker]
                       StripeColorInternal: 'none'
                                StripeEdge: [1×1 LineStrip]
                                   TagMode: 'auto'
                      TransformForPrintFcn: ''
        TransformForPrintFcnImplicitInvoke: on
    TransformForPrintFcnImplicitInvokeMode: 'auto'
                  TransformForPrintFcnMode: 'auto'
                             UIContextMenu: [1×1 ContextMenu]
                     UIContextMenuInternal: [1×1 ContextMenu]
                UIPointContextMenuInternal: []
                            UserIsDragging: 0
                             UserIsDrawing: 0
                        UserLeftStartPoint: 1
                               VisibleMode: 'auto'
                         WaypointsInternal: [28×1 logical]
                               XLimInclude: on
                           XLimIncludeMode: 'auto'
                               YLimInclude: on
                           YLimIncludeMode: 'auto'
                               ZLimInclude: on
                           ZLimIncludeMode: 'auto'
                      SerializableChildren: [0×0 GraphicsPlaceholder]

[dpb]

Looks like it would be

 LabelHandle: [1×1 Text]

You just have to start poking at the various things getundoc returns and see what they contain...I call it "handle diving" (from the obvious other type... :J) )

[Dylan Zhu]

Hmm ok got it, thank you!