On Thu, Jul 23, 2009 at 12:11 PM, Eliot Miranda <eliot.miranda at gmail.com>wrote:

> Hi Gary,
>
> On Thu, Jul 23, 2009 at 3:28 AM, Gary Dunn <osp at aloha.com> wrote:
>
>> On Thu, 2009-07-23 at 00:19 -0400, John McKeon wrote:
>> >
>> >
>> > On Tue, Jul 21, 2009 at 12:57 PM, Gary Dunn <osp at aloha.com> wrote:
>> >         I was reading about SqueakMap and came across the Swiki page
>> >         for Alice
>> >
>> >         http://wiki.squeak.org/squeak/1861
>> >
>> >         Is anyone actively using Alice in Squeak?
>> >
>> >            - The page was last edited in 2004
>> >
>> >            - The first link is dead
>> >
>> >            - The second link goes to the new, improved Sun sponsored
>> >         all Java
>> >         version of Alice, which appears to be healthy
>> >
>> >            - The third link downloads a Ph.D. dissertation from 1997
>> >
>> >            - After the outdated info is a rant on the shortcomings of
>> >         OpenGL.
>> >         It just starts up, mid stream, "There is a serious design flaw
>> >         in the
>> >         lighting or rather the shading." This should be removed.
>> >
>> >            - A search on the Swiki for Alice includes a page on Falice
>> >         which
>> >         links to www.falice.com which is a parked domain.
>> >
>> >         Last but not least, when I try to load "FullImageProjectAlice"
>> >         I get
>> >         errors. Very likely I am doing something wrong.
>> >
>> >         Is this worth pursuing, or has Alice in Squeakland wandered
>> >         off?
>> >
>> > Aloha Gary,
>> > I remember the first time I saw Squeak, A;ice was pre-loaded in the
>> > image, so I did some digging.
>> > If  you are really interested go to ftp.squeak.org and download a a
>> > 2.x version of Squeak.
>> > The 2.8 distribution has it installed. Be warned, the older Squeak
>> > interface might disappoint you ;)
>> >
>> > Regards
>> > John McKeon
>>
>> Thanks, John. I downloaded the 2.8 image and changes files, and the V2
>> sources, and launched squeak with those. It opens fine, if old looking,
>> and Alice is in there. I did a Wonderland new. and ran into an error:
>>
>> mustBeBoolean
>>        "Catches attempts to test truth of non-Booleans.  This message is
>> sent
>> from the
>>        interpreter."
>>
>>        self error: 'NonBoolean receiver--proceed for truth.'.
>>        ^true
>>
>> The offending code is
>>
>> areasRemainingToFill: aRectangle
>>        ^myCamera drawSceneBackground
>>                ifTrue:[aRectangle areasOutside: self bounds]
>>                ifFalse:[Array with: aRectangle]
>>
>> where "bounds" in the ifTrue branch is highlighted.
>
>
> This looks as if myCamera drawSceneBackground is not returning a boolean.
>  Certain messages, in particular ifTrue: ifFalse: ifTrue:ifFalse: whileTrue:
> and whileFalse: are inlined by the compiler into conditional branch
> instructions which operate on the object on top of stack.  The conditional
> branches expect either true or false, the sole instances of True and False
> respectively.  When they encounter something other than true or false the VM
> sends mustBeBoolean to that
> object.  So look in the debugger at the object that has received mustBeBoolean.  This was the result that myCamera
> drawSceneBackground returned, whereas areasRemainingToFill: expected a
> boolean.
>
> HTH
> Eliot
>
>>
>>
>> A little more digging reveals that senders of bounds have something to
>> do with AlignmentMorph, which is old stuff -- is the problem that ny VM
>> is too "new.?"
>>
>> Any suggestions as to how to proceed? Is there a way to cast "bounds" to
>> the Boolean requirement? Sorry, that's my C showing.
>
>
I believe that is what makes Smalltalk a *strongly* typed language. No
typecasting.

Loading the latest Baloon3D code from Squeaksource yields somewhat better
results but there is a bit of post load actions that appear to be required.



>
>>
>> --
>> Gary Dunn, Honolulu
>> osp at aloha.com
>> http://openslate.net/
>> http://e9erust.blogspot.com/
>> Sent from Slate001
>>
>>
>>
>
>
>
>


-- 
http://jmck.seasidehosting.st
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