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From: aries@rhi.hi.is (Mimir Reynisson)
Newsgroups: comp.sys.mac.programmer
Subject: Re: C++ method overriding
Message-ID: <2839@krafla.rhi.hi.is>
Date: 27 Feb 91 10:28:27 GMT
References: <2831@krafla.rhi.hi.is> <1991Feb25.214458.11837@ux1.cso.uiuc.edu>
Organization: University of Iceland
Lines: 66

>Constructors always call functions of their own class, even if the functions
>are virtual and overloaded. For that matter, since constructors should
>be inittializing info, it's not necessarily such a good idea to have them
>calling other functions. Just create a new constructor for the subclass and
>you'll be set.

Yup. I did something like that shortly after I posted my article. What I
was actually doing was plain silly - too little sleep and too much coffee,
I presume.

Anyway, now there is another impending problem. Well it's not actually
a problem, it's rather a nucance.

Look at this code fragment:

doDrawSomething() {

  Rect bounds;

  SetRect(&bounds, 10, 10, 50, 50);  // Draw a rectangle
  FrameRect(&bounds);

  MoveTo(bounds.left+1,bounds.botom); // Shade the rectangle
  LineTo(bounds.right,bounds.bottom);
  LineTo(bounds.right,bounds.top+1);
};

On my planet that does do what it's supposed to do. The shading is not
even near the rectangle let alone in the correct shape. To get the right
shading I'll have to do the following:

doDrawSomething() {
 
  Rect bounds;
  short h,v;

  SetRect(&bounds, 10, 10, 50, 50);  // Draw a rectangle
  FrameRect(&bounds);

  h=bounds.left; 
  MoveTo(h+1,bounds.botom); // Shade the rectangle
  LineTo(bounds.right,bounds.bottom);
  v=bounds.top;
  LineTo(bounds.right,v+1);
};

Or something like this:

doDrawSomething() {
 
  Rect bounds;
  short h,v;
 
  SetRect(&bounds, 10, 10, 50, 50);  // Draw a rectangle
  FrameRect(&bounds);
 
  h=bounds.left+1;
  MoveTo(h,bounds.botom); // Shade the rectangle
  LineTo(bounds.right,bounds.bottom);
  v=bounds.top+1;
  LineTo(bounds.right,v);
};

Can anybody please point out to me what is bogus with my code?

--MymR