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   comp.sys.apple2      Discussion about Apple II micros      56,720 messages   

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   Message 56,476 of 56,720   
   Steve Nickolas to I am Rob   
   Re: Some thoughts I had (Logo, turtle gr   
   20 Dec 23 20:15:46   
   
   From: usotsuki@buric.co   
      
   On Wed, 20 Dec 2023, I am Rob wrote:   
      
   >   
   >>> I don't know if you are into re-creating the wheel, but there is an   
   >>> excellent Turtle program for Applesoft basic that covers all the   
   >>> commands you just described. It uses Applesoft floating point heavily   
   >>> to calculate the angles and so forth.   
   >   
   >> Basically what I want to do, but there's the possibility of whether I can   
   >> actually _use_ it for what I need which might require me to ignore it.   
   >   
   > Gotcha.  The source is available too if it would help.   
      
   Perhaps.   
      
   >> I mean, I'll prolly be pinching most of the Apple ][ ROM in some form, but   
   >> there's reasons I think that won't go over as badly as the Franklin Ace.   
   >>> And have you heard of DublStuff? Sorry BB, but it is quite a bit better   
   >>> than Beagle and DRAW and XDRAW commands can be used on hi-res shapes to   
   >>> display on the dbl-hi-res screen.   
   >   
   >> DHGR would be kinda weird for this.   
   >   
   > The shapes would be used in monochrome mode and in most cases where   
   > color bleeds, the shapes show better detail.  Fonts, cursors and   
   > non-color shapes are in this category.   
      
   While it would certainly be slower and larger, it might be possible to get   
   better results from the DHGR mode, using 140x192x16.   
      
   Though the only thing the shape table would be needed for is to draw the   
   terrapin, and that's just white.   
      
   >>> When I converted over to Prodos, I stripped a lot of the unnecessary   
   >>> turtle commands down to just 4. & MOVE, &TURN, &HPLOT TO, &COLOR. The   
   >>> MOVE moves to any absolute coordinate without plotting and HPLOT plots a   
   >>> line in the direction set by TURN and COLOR. So you can still do   
   >>> forward and backward plots and PENUP/PENDOWN are eliminated.   
   >   
   >> Stripping them down would force me to reimplement them later when I switch   
   >> from "BASIC library" to "part of a Logo interpreter" (which would be   
   >> reused for another unrelated project), so doing them from the beginning   
   >> would make other stuff easier.   
   >   
   > Understood.  Most of the code is still there, mostly it is just the   
   > commands that were eliminated.   
      
   -uso.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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