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From: John Torjo (john.lists_at_[hidden])
Date: 2004-09-22 02:03:15

Andy Little wrote:

> "Matt S Trentini" <matt_trentini_at_[hidden]> wrote ...
>>Andy, your "unitless" concepts are terrific, keep 'em coming. :)
> Thanks for the encouragement :-)
> Back in the 'good old days', before GUIs and multitasking os'es, drawing on
> the display was a simple process, with some form of move_to, line_to, fill
> etc primitives. I guess I am trying to simulate that approach as closely as
> possible. IOW C++ currently has standards for character stream output, so
> I'm thinking... why not a standard for graphics stream output also?
> I am not looking into embedding any intelligent objects in the 'canvas' to
> begin with, however I am trying to keep that in mind. The component approach
> of ATL/WTL is very interesting from that point of view, wherein you add your
> messaging by multiple derivation, combined with CRTP. This Might be a very
> useful mechanism to make dumb drawing objects intelligent. For example, if I
> had a dumb line, it should be possible to 'attach' a class that can detect
> if that line is being grabbed with the mouse and so on.

If I'm not mistaken, in this case, you would need the class to use the
same metrics as the line.

As you later say - you seem to only want millimeters. I don't think
having only one set of metrics is a good thing. At least for me there
are a lot of times when I need pixels.


John Torjo
-- john_at_[hidden]
Contributing editor, C/C++ Users Journal
-- "Win32 GUI Generics" -- generics & GUI do mix, after all
-- v1.4 - save_dlg - true binding of your data to UI controls!
    + easily add validation rules (win32gui/examples/smart_dlg)

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