[new function/changeset] thought/request for ishandle()

[Ben Abbott]

On Oct 12, 2008, at 1:43 PM, Ben Abbott wrote:

> I've encountered several instances it the graphics m-files where  
> handles for figures are verified by
>
> 	ishandle (h)
>
> or
>
> 	isfigure (h)
>
> Just as often it would be useful to verify a figure represents some  
> other "type" of object. Checking for the other object properties  
> would also simplify programing.
>
> I'd like to inquire as to opinions of modifying ishandle() to  
> include additional property/value pairs. For example the equivalent  
> to isfigure(h) would be
>
> 	isfigure (h) -> ishandle (h, "type", "figure")
>
> A check for an axes handle
>
> 	ishandle (h, "type", "axes")
>
> For a text handle
>
> 	ishandle (h, "type", "text")
>
> To find the pair of overlayed axes for plotyy where the
>
> 	hax = findobj (hfig, "type", "axes");
> 	ca = get (hfig, "currentaxes");
> 	ax = hax (ishandle (hax, "type", "axes", "position", get (ca,  
> "position")));
>
> Rather than including optional property pairs with ishandle(),  
> perhaps a new function should be written?
>
> 	ishandle_with_prop (h, "prop1", value1, "prop2", value2, ...)
>
> In the event of the latter, a m-file can be written (a task I'd be  
> happy to take on), for the former the built-in would need to be  
> modified.
>
> Thoughts?
>
> Ben

Please consider the attached changeset for the new function  
ishandle_with_props().

	ishandle_with_prop (h, "prop1", value1, "prop2", value2, ...)

My intent is that it be used to verify axes handles. I'm prepared to  
apply it to the existing m-files provided it is accepted. The files  
I've identified as the present are: axes.m , cla.m, colorbar.m,  
comet.m, hold.m, plotmatrix.m, plotyy.m, & colorbar.m.

With the exception of colorbar() which looks for an image handle, the  
others seek an axes handle. In the case of plotyy looking for an axes  
handle with a specific "position" would be useful.

Ben

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