Re: [Boa Constr] newbie question -- using Boa for creating a drawing canvas

[John B. <jbe...@ya...>]

Hi John,

--- John Boik <joh...@om...> wrote:
> Hello:
> I am new and hoping to complete an easy (?) project.
>  In a nutshell, I need
> to place a gif pic (a pic of a graph) on a frame,
> then draw litle boxes
> around points on the graph and collect the
> coordinates for the box centers.
> Sounds simple enough....but I downloaded Boa and see
> that it has no canvas
> tab on the Editor window.  How does one go about
> placing a drawing canvas on
> a frame using Boa?

I presume that what you mean is that you can't find
any form of "Canvas" type control on the Palette. 
This is not surprising since wxPython has no control
of this type.  You need to associate a Device Context
with the frame and draw to that.  There should be an
example in the wxPython demo.

From a Boa integration point of view your options are
either to add the extra code in the __init__ block by
hand (along with required event handlers in the module
block) or to build a canvas class as a derived class
of one of the container classes, maintaining the same
initialisation signature as the container class and
then use it as a Custom Class (see Boa documentation).

John Bell

> 
> Any help is appreciated.  John
> 
> John Boik
> Oregon Medical Press
> www.ompress.com
> joh...@om...
> 
> 
> 
> 
>
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