![]() ![]() This in turn enabled me to take the essence of the pinning code and implement it in my stand-alone application code.īelieve me when I say that the scribe code is complex (anyone say convoluted?). This showed me the code path (beneath %matlabroot%/toolbox/matlab/scribe/), and placing breakpoints in key code lines enabled me to debug the process step-by-step. A context-menu is only assigned to the annotation after the Edit Plot toolbar button and then the annotation object are clicked.īeing too lazy in nature to debug this all the way through, I opted for an easier route: I started the Profiler just prior to clicking the context-menu’s “Pin to Axes”, and stopped it immediately afterwards. ![]() Unfortunately, this does not work well, because the context-menu is empty when the annotation is first created. We could then use the hgfeval function to execute this callback programmatically. The obvious first place to start debugging this issue is to go to the annotation handle’s context-menu (accessible via the UIContextMenu property), drill down to the “Pin” menu item and take a look at its callback. But still, it would be nice if we could specify the annotation in graph (plot axes) data units, and have it pinned automatically without requiring manual user interaction. Oh well, it’s better than nothing, I guess. But whereas the Java glass-pane is a true transparent layer, on top of all other window components ( examples), Matlab’s implementation only works for axes. Matlab’s implementation of annotation is an attempt to replicate Java’s standard glass-pane mechanism. Since plot axes are always obscured by uicontrols, so too is the annotation layer. ![]() For this reason, annotation requires figure position – in fact, the annotation has no information about the axes beneath it. In fact, they are located in a separate axes layer. The annotations may appear to be connected to the plot axes, but this is merely a visual illusion. ![]() This is based on a transparent hidden axes that spans the entire figure’s content area, on which the annotations are being drawn (also called the scribe layer). Finally, the annotation objects are only displayed on top of plot axes – they are obscured by any GUI uicontrols that may happen to be present in the figure.Īll of these limitations originate from the underlying implementation of annotation objects in Matlab.Unfortunately, the annotation handle does not provide a documented way to do this programmatically. We can indeed pin the annotation to the graph, but this requires delicate manual interaction (click the Edit Plot toolbar icon, then right-click the relevant annotation end-point, then select “Pin to Axes” from context menu). This results in unintelligible and misleading annotations. This means that the annotation retains its relative position in the figure when the plot is zoomed, panned or rotated. The created annotation is NOT pinned to the plot axes by default.To correctly convert the position from plot axes data coordinates to figure coordinates requires non-trivial calculations. Often, we are interested in an annotation on a plot axes that does NOT span the entire figure’s content area. annotation requires us to specify the annotation’s position in normalized figure units.Unfortunately, annotation has several major deficiencies, that are in fact related:Ī Matlab text-arrow annotation (unpinned) Through the handle returned by annotation we can customize the annotation’s appearance (for example, line width/style or text font properties). Matlab has a corresponding built-in function, annotation, that enables creation of annotation objects. Many Matlab users are aware of Matlab’s annotation functionality, which enables us to assign graphic elements such as arrows, lines, ellipses and text labels to Matlab figures. ![]()
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