[stella] invaders idea

Subject: [stella] invaders idea
From: Glenn Saunders <krishna@xxxxxxxxxxxx>
Date: Sat, 12 Apr 1997 16:06:19 -0700 (PDT)
Hmm..  I may have an idea!

The big problem with these invaders isn't so much the lack of definition,
it's that they don't "march" at all.  If you can at least get the shapes
to animate, even if they are blocky, it will work a lot better. 

Would it be possible to manipulate the playfield graphics so that the
blocks alterate like so:

xxxxxxxxxxxxxxxxxxxxxxxx
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xxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx

Frame 1

xxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxx
            xxxxxxxxxxxx
            xxxxxxxxxxxx <--- legs, one playfield graphic pixel wide

Frame 2


By manipulating playfield graphics at the pixel level this way and
animating them, you can even get a few variants on the shapes.  By
alternating color on a scanline by scanline basis instead of just an
invader row by invader row basis you can also increase the apparent detail
on the invaders.  In this way you may be able to get five truly different
invader rows.


            xxxxxxxxxxxx
            xxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx

Variant 1


xxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxx
xxxxxxxxxxxx

Variant 2

xxxxxxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxx

Variant 3 Frame 1

xxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxx

xxxxxxxxxxxxxxxxxxxxxxxx

Variant 3 Frame 2 (pumping animation)




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