I'm trying to write the code to draw a screen where sprites have the
following features:
1- sprite 0 has full movement in both X and Y axis (it's controlled by the
player), and is used only once. This means that it can be positioned during
VBLANK, but it must be turned on and drawn during a number of scanlines.
2- sprite 1 can move only on the X axis but it is reused more times so that
it appears at various fixed Y positions.
This picture can help:
+---------------------+
| ^ |
|<--|--S1------------>|
| | |
|<--|--S1------------>|
| | |
|<--S0-S1------------>|
| | |
|<--|--S1------------>|
| | |
| | |
| V |
+---------------------+
If you've seen the demo I posted some time ago, I've already been able to
write the code to draw S1 with sprite reuse (and more); now I need to throw
in S0 but this looks more difficult that I thought.
In particular, for each scanline (or pair of scanlines) one must find the
time to draw _also_ the correct slice of S0 _if needed_.
And of course this must happen even in those lines where S1 is repositioned.
Yuk.
I'm working on this, but if you've some ideas I would like to hear from you.
BTW, there should be a missile too... :-/
Ciao,
P.
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