[Coco] Question on MINTED internals

[Cocodemus]

Check the gotoxy function. 

Sent from my iPhone

> On Dec 24, 2015, at 2:42 AM, Neal Crook <foofoobedoo at gmail.com> wrote:
> 
> thanks to Robert, Dave and Coco Demus for their comments and explanations
> 
>>> If you think your way is better, then go for it.
> no, I was simply trying to understand the (your) intent; your explanation
> makes perfect sense.
> 
> My remaining confusion is this.. looking in term_vdg.asm I see szx=32,
> szy=16 which will result in width being 32 and height being 16. If rows and
> columns are numbered from 0, the valid rows are 0..15. The way I read this
> code, it clear lines with row=15 (bottom row) and row=16 (no such row).
> What am I missing here?
> 
> thanks,
> 
> Neal.
> 
> 
>> On 24 December 2015 at 07:21, CoCo Demus <retrocanada76 at gmail.com> wrote:
>> 
>> Hi,
>> 
>> Why ? Well, this code clears line 24 and 25 and displays at line 25 the
>> message: Rename/Save as: so If I did like you said I would still need to
>> incb after the last _clrlin because I want a clear line separating the text
>> and the message. This is more a code style, I wasn't trying to do a extreme
>> optimization in the code. If you think your way is better, than go for it.
>> 
>> cheers
>> 
>>> On Wed, Dec 23, 2015 at 3:32 PM, Neal Crook <foofoobedoo at gmail.com> wrote:
>>> 
>>> Here's my contribution towards raising the technical tone of the
>>> conversation...
>>> 
>>> I am working on a port of Luis Antoniosi's MINTED editor to produce a
>>> version that uses ANSI control sequences. The idea is that it would work
>>> across an rs232 link from a terminal emulator to a real Coco or (and more
>>> importantly for me) work on a virtual terminal on my NitrOS9 multicomp
>>> system.
>>> 
>>> Here's a fragment of the original source code (I added the line numbers
>> for
>>> reference):
>>> 
>>> 1: _rename     pshs    a,b,x,y
>>> 2: @repeat     clra
>>> 3:             ldb     <height+1
>>> 4:             decb
>>> 5:             lbsr    _gotoxy
>>> 6:             lbsr    _clrlin
>>> 7:             ldb     <height+1
>>> 8:             lbsr    _gotoxy
>>> 9:             lbsr    _clrlin
>>> 
>>> Assume that the output device is 80 col by 25 row and the height is
>> stored
>>> as a 16-bit value, so
>>> that line 3 loads "25" into B.
>>> 
>>> The call in line 5 has A=0, B=24
>>> The call in line 8 has A=0 (assuming A is preserved), B=25
>>> 
>>> Questions:
>>> 
>>> 1/ why not do this:
>>> 
>>> 1: _rename     pshs    a,b,x,y
>>> 2: @repeat     clra
>>> 3:             ldb     <height+1
>>> 4:
>>> 5:             lbsr    _gotoxy
>>> 6:             lbsr    _clrlin
>>> 7:             decb
>>> 8:             lbsr    _gotoxy
>>> 9:             lbsr    _clrlin
>>> 
>>> 2/ is the corner of the screen 0,0 or 1,1 (or something else? I'm puzzled
>>> by the A=0, B=25 which seems contradictory)
>>> 
>>> 3/ is the corner (0,0 or whatever) the top-left corner or some other
>>> corner?
>>> 
>>> (For reference, an ANSI screen has the top-left corner as 1,1)
>>> 
>>> Thanks in advance for any enlightenment
>>> 
>>> Neal.
>>> 
>>> --
>>> Coco mailing list
>>> Coco at maltedmedia.com
>>> https://pairlist5.pair.net/mailman/listinfo/coco
>> 
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