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halldave

Senior Member

Joined: 04/05/2014
Location: Australia
Posts: 121

Posted: 02:35am 12 Jul 2020

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Hi,

I'm currently creating a Space Invaders clone and have a sprite question

There are 55 Aliens displayed on the screen at the start,
1 row of 11 of the the smallest
2 rows of 11 of the middle
2 rows of 11 of the largest

each of these aliens have two animation states
do I load each of these as sprites 1 to 55
then clear each of them and reload the second animation state, or how would you suggest the best way to go about this?

Im two rows in at the moment.

David

Womble

Senior Member

Joined: 09/07/2020
Location: United Kingdom
Posts: 267

Posted: 03:05am 12 Jul 2020

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halldave said Im two rows in at the moment.

David ... looks good

I can only suggest "Dakka, Dakka, Dakka ..."

I like your screen layout, keep up the good work

realmnm

Newbie

Joined: 07/07/2020
Location: Australia
Posts: 34

Posted: 03:10am 12 Jul 2020

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I've been playing with something similar that requires a lot of sprites. I have just been overwriting them, and according to the documentation, as they are the same size, it reuses the same buffer. I've attached it so you can see what I was doing, it isn't usable as is for a final program, it was purely just for experimentation, so no warranties expressed or implied! I hope to make this into a full game at some stage, but I'm going to start smaller for now.

Galactica.zip

Martin

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halldave

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Joined: 04/05/2014
Location: Australia
Posts: 121

Posted: 05:02am 12 Jul 2020

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Wow I love Galaga, so would love to see the final version ,Your code looks like a good start, however I am using the sprite copy command

in your code where you have

for i = 0 to 19
sprite read 23 + i, 160, 175, 16, 16
next

Maybe could work like this

sprite read 23, 160, 175, 16, 16
sprite copy 23,24,19 ' Copy sprite 23 to 24 starting at 24 and a further 18

I wonder in the 64 sprites is a hardware or practical limit or if you there is someway if it can be increased if many of the sprites reference the same memory.

Ill keep playing anyway

halldave

Senior Member

Joined: 04/05/2014
Location: Australia
Posts: 121

Posted: 05:19am 12 Jul 2020

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galaga.zip

I added a couple of Galaga resources for you to play with, I will go with your open and close technique as that can be adapted to the Space Invaders.

realmnm

Newbie

Joined: 07/07/2020
Location: Australia
Posts: 34

Posted: 05:52am 12 Jul 2020

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halldave said Maybe could work like this

sprite read 23, 160, 175, 16, 16
sprite copy 23,24,19 ' Copy sprite 23 to 24 starting at 24 and a further 18

I wonder in the 64 sprites is a hardware or practical �limit or if you there is someway if it can be increased if many of the sprites reference the same memory.

Ill keep playing anyway

Yeah I didn't know about the SPRITE COPY command when I wrote that, I'm working through the manual at the moment.

I think it is a practical limit, so it doesn't chew through a lot of memory storing the sprite and the background under it.

Keep on playing, that's what I'm doing.

Martin
Edited 2020-07-12 15:54 by realmnm

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