Re: cocoa and float-format

On Wed, 5 Feb 2003, Robert Sedgewick wrote:

> Hi,
>
> It seems to me that on my machine (OSX), the cocoa
> libraries do not load correctly if the
> default-float-format has been set to double format.
>
> ie:
> (setf *read-default-float-format* 'double-float)
> (require 'cocoa)
>
> does not correctly launch the cocoa listener, but gets
> stuck in some half-launched state.  I guess this is
> due to some float literals in the cocoa code?  I'm a
> lisp newby, so I'm not sure how this could be fixed.

There are a few floating constants in the Cocoa example
sources that are written without explicit exponent
markers (e.g., as something like "0.0", instead of as
"0.0f0" or "0.0d0").  The ones that may be causing the
most difficulty are in the function GET-SIZE-FOR-TEXTVIEW,
defined in "ccl:examples;cocoa-editor.lisp", where the
constants 1.0 and 0.0 should have been written as "1.0f0"
and "0.0f0", respectively.

The variable *DEFAULT-FONT-SIZE* is initialized to 12.0;
12.0f0 would be more correct, but the value is explicitly
coerced to SINGLE-FLOAT before being used.

The code that's using these particular values is trying
to determine the window size based on a font's bounding
box; the foreign code that's actually going to uses the
calculated window dimensions expects them to be expressed
as SINGLE-FLOATs.



>
> Thanks,
> Robbie
>
> btw I'm using version 0.13.4
>
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