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Newcomers DBPro Corner / Boundaries on a screen?

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Hatebreed
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Joined: 18th Sep 2007
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Posted: 30th Oct 2007 03:21
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Hey guys,

My instructor has given us an assignment to work on throughout the week and this is what he needs us to do:

1.Have an animated sprite that moves in all four directions either by keyboard or mouse (or both)

2. The animated sprite must also face the direction it is moving in.

O.k., I have those two things complete. The only thing is something personally bugging the heck out of me. I have rummaged through the book and because I don't know what it is called I have no clue where to look.

When I move the object it runs completely off the screen and, I guess, keeps going. I have googled phrases I think it could be, searched through the forums here and I still cannot find snippets of code or a tutorial that could help me out.

If anyone knows where I could find one of the two (preferably Tutorial so I am actually learning it...Then I can show off in class when we learn it!!!)

To reiterate the question because I feel I got a little off track:

I am trying to figure out how to keep an object or sprite from going off the edge of the screen.

Thanks,
Hatebreed
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TDK
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Posted: 30th Oct 2007 03:31
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When the sprite moves to the left, you reduce the variable which controls it's X position. To stop it moving off the left side of the screen, immediately after the line which calculates it's screen X position you use something like:

If LeftKey()=1 Then Dec SpriteXPos: If SpriteXPos < 0 Then SpriteXPos = 0
Sprite 1,SpriteXPos,SpriteYPos,1

You repeat the same thing after the other three directions (not forgetting to take into account the sprite dimensions). Eg something like:



TDK_Man

* TDK's Game Programming Forums - Open To All - DB & Team Request Boards *

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Hatebreed
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Posted: 30th Oct 2007 03:36
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Ok so, that code is a little confusing to me but I have to just read it slowly. Anyways, it looks as though I will need more then the origional two variables I started out with?

i started with pacX and pacY for the x and Y coordinates using the keys to move around. Will I need more or will spriteXpos and SpriteYpos be replaced by my origional two variables?

I hope that makes sense...

I attached my code so I hope it makes a little more sense.

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jason p sage
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Posted: 30th Oct 2007 05:08
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Man TDK - We are hitting the same stuff - perusing at the same time - hope I'm not toe stepping by trying to help also

(you nailed this one )


http://www.jasonpetersage.com/?PAGE=ironinfantry&SECTION=ironinfantry
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TDK
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Posted: 30th Oct 2007 05:14
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Quote: "hope I'm not toe stepping by trying to help also"


No of course not - lol!

Quote: "i started with pacX and pacY for the x and Y coordinates using the keys to move around. Will I need more or will spriteXpos and SpriteYpos be replaced by my origional two variables?"


I just used spriteXpos and SpriteYpos as examples. You only need two - the top left X position for the sprite and the top left Y position.

Just replace the two variable names I used for whatever your program uses (pacX and pacY).

TDK_Man

* TDK's Game Programming Forums - Open To All - DB & Team Request Boards *

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Eevil Weevil
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Posted: 17th Nov 2007 20:53
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And for rotating your sprite, you could have a string, perhaps 'pacDirection$'. If the leftkey() is being pressed, then you could check if the sprite if already facing left ('pacDirection$="left"'). If it is, don't do anything. However, if it isn't already facing left then you could have the program A; Mirror it if it is facing right ('Mirror Sprite SPRITENUM') and B; set the 'pacDirection$' string to "left". You could then do that with right, up and down (You can flip the sprite vertically by using 'Flip sprite SPRITENUM')

Impossible? Anything is impossible. 48'6F'77'20'64'61'72'65'20'79'6F'75'20'77'6F'72'6B'20'6F'75'74'20'6D'79'20'73'69'67'21

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