Hi...
I'm having difficulties on moving a sprite which was horizontally located by the RESP0 comand, it just doesn't move. Can somebody help me on this?
0
Movement
Started by Unsurreal, May 15 2004 5:37 PM
2 replies to this topic
#2 OFFLINE
Bad Panda Bear
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- 94 posts
Star Raider
- Location:San Diego, CA
Posted Sun May 16, 2004 12:25 AM
How are you trying to move it?
If you are trying to move it by setting the HMPx registery, then it won't move until you do a "STA HMOVE". (Note this should be done after an "STA WSYNC")
If you are using a full horizontal positioning scheme like described here, then it's simply a matter of changing the horizontal position variable between frames.
Hope this helps.
If you are trying to move it by setting the HMPx registery, then it won't move until you do a "STA HMOVE". (Note this should be done after an "STA WSYNC")
If you are using a full horizontal positioning scheme like described here, then it's simply a matter of changing the horizontal position variable between frames.
Hope this helps.
#3 OFFLINE
Unsurreal
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- 11 posts
Space Invader
- Location:Brazil
Posted Sun May 16, 2004 3:43 PM
Well, thanks anyway, but I discovered some other way to make it happen.
The problem was that at every frame I was saying to put the sprite in the same place by setting the RESP0, so it seemed that the moving routine was the problem.
I created a variable to make sure that I would locate the sprite in the place I want it to start just one time. I set it with 1 before the MainLoop (frame loop).
And then this is what I made, after the scanline loop:
; Check if I need to locate the Sprite at the center of the screen
ldy #82 ;this is the number of cycles I had to "waste"
lda rhpos ;load the variable responsable for the checking
beq hpos ;if it's 0 skip the code below and go to hpos
lda #0 ;A=0
sta rhpos ;rhpos=0, so it will never happen again
timeforhpos ;delay for right positioning
dey
bne timeforhpos
sta RESP0 ;and call the sprite right here
hpos ;label that the code goes when rhpos is 0
Thanks again.
The problem was that at every frame I was saying to put the sprite in the same place by setting the RESP0, so it seemed that the moving routine was the problem.
I created a variable to make sure that I would locate the sprite in the place I want it to start just one time. I set it with 1 before the MainLoop (frame loop).
And then this is what I made, after the scanline loop:
; Check if I need to locate the Sprite at the center of the screen
ldy #82 ;this is the number of cycles I had to "waste"
lda rhpos ;load the variable responsable for the checking
beq hpos ;if it's 0 skip the code below and go to hpos
lda #0 ;A=0
sta rhpos ;rhpos=0, so it will never happen again
timeforhpos ;delay for right positioning
dey
bne timeforhpos
sta RESP0 ;and call the sprite right here
hpos ;label that the code goes when rhpos is 0
Thanks again.
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