Beginners problem with DBpro-Bitmaps and sprites

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D258

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Joined: 22nd Feb 2005

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Posted: 22nd Feb 2005 09:48

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I have a book about darkbasic, but i am using dark basic pro.

and i have a bit of a problem already, when i do the load bitmap "file",0 i am able to display a bitmap on the screen, however when i use the load bitmap "file",1 use the get image command and set the sprite, nothing shows on the screen.

i tired to make this bitmap actually "move" while in the screen using the following code:

load image "c:\box.bmp",1
sync
wait key
for i=0 to i=100
sprite 1,i,i,1
next i
wait key

in the book i have, there is a command called SpritX(n) i tried using that to move the sprite but no luck

in fact it gives me an error when i try to use the sprite x(1) command.

the only thing else i can add is the fact that when i use load bitmap "file",0 i do see the bitmap displayed on the screen, but i can't move it or anything.

oh yea, i will also need to use collision later on..

so any idea as to what i am doing wrong?

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MSon

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Joined: 13th Jul 2004

Location: Earth, (I Think).

Posted: 24th Feb 2005 07:52 Edited at: 24th Feb 2005 08:06

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1st:
Theres no Position Sprite command so heres a function that I use...

+ Code Snippet

Function PositionSprite(Sn,x,y)
  Sprite Sn,x,y,Sprite Image(Sn)
EndFunction

2nd:
when you use the Bitmap Screens you need to remember the command [Set Current Bitmap] which Sets the bitmap screen to be edited...
Ps: bitmap screen 0 is the main screen

3rd:
This code should work

+ Code Snippet

Load Image "c:box.bmp",1
Sprite 1,0,0,1

For i=0 to i=100
PositionSprite(1,i,i)
next i
Print "Complete..."
wait key

4th:
SpriteX?
Try:
Sprite X(1) and Sprite Y(1)

5th
Sprite Collision...
I think theres a [Sprite Hit] Command
Or
Sprite Collision With Mouse

+ Code Snippet

Function MouseOverSprite(Sn)
       ` Returns a Value of 1 If the Mouse if Over the Sprite
       ` Else Returns 0
      If MouseX() > Sprite X(Sn)
      If MouseY() > Sprite Y(Sn)
      If MouseX() < Sprite X(Sn) + Sprite Width(Sn)
      If MouseY() < Sprite Y(Sn) + Sprite Height(Sn)
         ExitFunction 1 :EndIf:EndIf:EndIf:EndIf
EndFunction 0

Hope this helps

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Soy Cocktail

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Posted: 24th Feb 2005 08:13

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A problem that would always happen to me was I would froget to use the sync command. You have it before it goes into the for loop, but not inside the for loop. You probably need a sync or you should delete that extra sync command if you have it on auto screen updating, meaning it dosent just update when it hits a sync command. I assume that you want to be able to see the sprite move, since you didnt just posisition the sprite at 100x and 100y but had it move with a for loop.
try adding the command sync before the next i command.
it should look something like this

+ Code Snippet

for i=0 to i=100
sprite 1,i,i,1
sync
next i

Aku Soku Zan

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smerf

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Posted: 24th Feb 2005 18:34

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i am using dark basic professional. I followed the book exactly to load a sprite and all i got was a black screen. however later i added set current bitmap o and the sprite showed up on the screen except the screen was blue now. Is that supposed to happen? Please look at my source and let me know if it is right. or what is wrong thank you.

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MSon

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Posted: 25th Feb 2005 02:19

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The Code's not showing, but try the Following Command

+ Code Snippet

Color BackDrop 0,0

That should fix it

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smerf

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Joined: 24th Feb 2005

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Posted: 25th Feb 2005 18:33

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the sprite will load in demo version db but not in my dbpro. i tryed the backdrop code it set the background to black and the spite would not show. i have also tryed loading a background image to the screen then displaying the sprite but all i get is the background. the only way i have been get it to show is setting set current bitmap 0 but then the whole blue screen thing again . here is the code i have been using to display the sprite.

+ Code Snippet

load bitmap "f15.bmp" ,1
get image 1,0,0,300,300
sprite 1,170,90,1
wait key

ty for your help. ps. is there a place i can go to get help on what all the buttons on the forum do.

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walkman

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Posted: 27th Feb 2005 10:17

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Try Set Current Bitmap 0 before the wait key line. I believe whenever you load or create a bitmap it stops writing to the screen and writes to the bitmap instead until you set the current bitmap back to 0.

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