Going from one screen to another

[david911]

Hi, i created as a test 9 screens, i can go left and right between the screens but not up and down.
i try to cut the floor away of room 2 and so i can just fall down into room 6, not nothing happens.
any idea?


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[dvader]

I had a similar issue with a platformer I am tinkering with now and again. I wrote this code to get round it.
IF SCREEN = 6
IF Y >= BOTTOMEDGE
SCREENDOWN
LET Y = 5 ;TOPEDGE
EXIT
ENDIF
ENDIF
Checking the screen number ensures it only does it on screens you want to jump up or down from. This example is dropping to a lower screen, you will just need to do the opposite to get it going up a screen, hope this helps.
Oh the topedge was too high so the let y=5 bit is to lower it a little, I left the topedge in as a rem so easy to see what it's doing.

[david911]

Thanks alot friend, ive been using the following which works,
IF Y >168
SCREENDOWN
LET Y 8
FALL
ENDIF
but im going to try add yours for better results. Thanks for replying

[dvader]

No problems, I know it's rare to get many answers on these forums So as I knew I had managed your request, thought I'd post my solution. your little bit of code has given me an idea how to fix a bug as well so you may have helped me as well! Glad you had it working already and good luck with your project.

[david911]

Thats brilliant, great that we can help each other.
Thanks again.

[dvader]

No luck unfortunately. It's not game breaking (although can cause some issues) but so far nothing has solved the issue I have. There's something when switching screens that causes something in the jump code to reset, so it jumps again in mid air. I was hoping the fall command may fix it but no, still jumping on its own when switching screens I think (hopefully) it's the last bug I can easily see that is left, but is for certain a nasty one for a greenhorn like me. Adding a loading screen and music are the final pieces of the puzzle, but no idea how to do that at present, but I digress lol.

[david911]

Here is what im using, im fine tuning , going direct to the room, rather than "SCREENUP".

IF SCREEN = 7
IF Y >170
LET SCREEN = 8
LET Y 8

ENDIF
ENDIF


but was hoping you know a method from when i leave the bottom of SCREEN 1 to also go back up to screen 1?

[david911]

Loading screen is pretty easy, you just need to track down the correct programs.
Just follow the below carefully and its a breeze.

www.minilopretro.com/post/how-to-add-a-loading-screen-to-your-mpagd-game

[dvader]

Cool, will have a look. I know how to make load screen$ on an original speccy with a tape recorder, but find that sort of thing difficult with emulation. Tape options are normally limited.
Not quite sure of your question but for up I did this.
IF Y <= TOPEDGE
SCREENUP
LET Y = 130 ;BOTTOMEDGE
EXIT
ENDIF
Minus the screen check.
If you want to be able to jump back up, just make sure that you position the player below or above the check point for switching screens. Else you get a loop of death where they flip repeatedly.

Edit

Do you mean dropping from say, screen 1 to the top of screen 1? That would be just a matter of setting the co-ord's to the new position without using the SCREENDOWN command I would think. Not tried it myself, but should work for some sort of teleporters I imagine

[dvader]

Had a quick look at that guide. Seems the link to ZX BlockEditor doesn't work so not a great start