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Cobrakid
Registered: Oct 2011
Posts: 23 |
Create smooth scrolling starfield
I want to make a classic starfield look where the stars are coming from left towards right... just normal dots. What is a good approach for this you think?
I have considered a table with the starfield and then shifting them in the table but that sounds a little overkill and slow. I have also though of randomly generating some dots but I have no idea how to do that (no random generator in C64)?
Any good ideas are appreciated (and I would love some pseudo-code to see how you would do it). |
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algorithm
Registered: May 2002
Posts: 705 |
Don't use $d016. |
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Ksubi
Account closed
Registered: Nov 2007
Posts: 87 |
http://www.codebase64.com/doku.php?id=base:demo_programming
Scroll down to the bottom of the screen, might be of some help Cobrakid. |
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TWW
Registered: Jul 2009
Posts: 545 |
If you are planning on using sinus sprites, good luck with the rasterbars underneath. You should look at spritestretching or dysp tech to do that :-) |
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algorithm
Registered: May 2002
Posts: 705 |
One of the simplest forms of starfield is to fill the entire screen with one char eg char (0) then just move the dot and voila the entire screen will consist of 1000 dots moving. move other dots at different speeds and voilla. parallax. next stage would be to use longer char strips |
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Soren
Registered: Dec 2001
Posts: 547 |
There's a nice one in here, done with sprites.:
Imaginating
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Skate
Registered: Jul 2003
Posts: 494 |
i don't remember that one Jeff. thank you for sharing. it's really good, specially skipping bad lines and allowing inner screen to be open makes it extra special. of course other great fullborder starfield is here -> Unicorn |
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Honesty
Registered: Jan 2003
Posts: 121 |
For doing a starfield use 8 chars where you had a "dot"
in means bit 7 to 0 .
When going from right to left mask it with and#07
if the result ist zero decrease the offset for
the star (something like star at 0427 when result is
zero 0426 and store the rest as new x offset).
This also works with fld thingy but you need
something like 64 chars then ,means 8x8 dots.
As i remember flosch of sabian did something
similarin just one part demo.
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