Re: A92: A quick method to fill rectangles
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Re: A92: A quick method to fill rectangles
-----Message d'origine-----
De : Anton Ivanov <ivanova@ucs.orst.edu>
À : assembly-92@lists.ticalc.org <assembly-92@lists.ticalc.org>
Date : vendredi 3 avril 1998 21:14
Objet : Re: A92: A quick method to fill rectangles
>
>Marcel FONDACCI wrote:
>>
>> I am just making a Tunnel-game for fargo II and released the very
>> beginning of this game because I had sevral problems :
>> Does somebody know a fast method to FILL rectangles with solid BLACK
>> in assembly ?
>
>The easiest method if you don't know exactly how LCD mem works is to use
>LineLib to fill the rectangle line by line.
>
>> How is it possible to scroll the screen without redrawing all the
>> screen ?
>> (like a screenshot maybe ???)
>
>The fastest (but not most memory efficient) way is to make a handle to
>store all of LCD mem but one row of 30 bytes. So if you want to scroll
>one row up, you would store everything but the first row and then paste
>the contents of the handle right into the beginning of LCD mem. I hope
>you get the idea. If you want to scroll sideways, you have to shift all
>bytes (or words) in every row by one bit in appropriate direction.
>
Yes I understand, but I don't know how to use handles (I just know how
to allocate them and how to free them)
I think I am able to make them pointing on the LCD mem, but I don't know how
to manipulate them :
such as deleting a row or changing an element ...
Can you explain me how can I do that and/or another method to scroll the
screen without using a handle.
(I currently use a simple array with a linelib equivalent method but the
screen is flashing)
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