Tile Collision, How to improve? - GameCreators Forum

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Binary Coder

17

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Joined: 26th Feb 2007

Location: Queensland, Australia

Posted: 24th Dec 2009 06:44

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Hey Everyone! I've been away from DBPro for a long time now, and i just picked it up again last week

something to do in the holidays (australia, not sure about the rest of the world

)
For the past week I've been learning as much as I can, pretty much from scratch, desperate to actually get somewhere with it this time

Anyways, I've kinda been struggling for a couple of days. I'm attempting to make a small 2D plaformer, in hopes to learn alot. I finally worked out how to make a level from tiles (see code), but now Im kinda lost where to go with the collision. I've searched what there was on the forum and found what i have now, but its realy bad imo.

sync on

DIM square(10,10)

gosub make_images

gravity# = .02
power# = 2
velocity# = 0

`set the array values
for y = 1 to 10
   for x = 1 to 10
      read square(x,y)
      if square(x,y) = 3
        charx = x*33
        chary# = y*33
      endif
   next x
next y

`_______________________________________
REM BEGIN MAIN LOOP
`_______________________________________
do
cls
gosub draw_level

gosub sprite_control

sync
loop

`______________________________________
REM SUBROUTINES
`______________________________________

`draw the images for the game (tiles)
make_images:
   cls rgb(255,0,0)
   get image 1,0,0,32,32
   cls rgb(0,255,0)
   circle 16,16,16
   line 8,20,26,20
   circle 8,8,3
   circle 24,8,3
   get image 2,0,0,32,32
   cls
return

`draw the level
draw_level:
for y = 1 to 10
   for x = 1 to 10
      if square(x,y) = 1
         paste image 1,x*33,y*33
         stilex = x
         stiley = y
      endif
   next x
next y

return

`crontrol the updating and movement of the sprite
sprite_control:
   sprite 1,charx,chary#,2

gosub movement
return

`movement subroutine
movement:
   if leftkey()
      charx = charx - 1
   endif
   if rightkey()
      charx = charx +1
   endif

if point(charx,chary#) = rgb(255,0,0)
      charx = charx + 1
   endif
   if point(charx+32,chary#) = rgb(255,0,0)
      charx = charx - 1
   endif

gosub jumping
return

`jumping subroutine
jumping:
   if point(charx+16,chary#+33) = rgb(255,0,0)
      onground = 1
      falling = 0
   else
      falling = 1
      onground = 0
   endif

if falling
      velocity# = velocity# + gravity#
   else
      velocity# = 0
   endif

`jumping
   if spacekey() and onground
      velocity# = velocity# - power#
      falling = 1
   endif

chary# = chary# + velocity#
return

`_________________________
REM DATA
`_________________________
map:
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,1,0,0,1
data 1,0,0,0,0,1,0,0,0,1
data 1,0,0,0,1,0,0,0,0,1
data 1,0,0,1,0,0,0,0,0,1
data 1,0,1,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,1,1,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,3,0,1
data 1,1,1,1,1,1,1,1,1,1

+ Code Snippet

sync on

DIM square(10,10)

gosub make_images

gravity# = .02
power# = 2
velocity# = 0

`set the array values
for y = 1 to 10
   for x = 1 to 10
      read square(x,y)
      if square(x,y) = 3
        charx = x*33
        chary# = y*33
      endif
   next x
next y

`_______________________________________
REM BEGIN MAIN LOOP
`_______________________________________
do
cls
gosub draw_level

gosub sprite_control

sync
loop

`______________________________________
REM SUBROUTINES
`______________________________________

`draw the images for the game (tiles)
make_images:
   cls rgb(255,0,0)
   get image 1,0,0,32,32
   cls rgb(0,255,0)
   circle 16,16,16
   line 8,20,26,20
   circle 8,8,3
   circle 24,8,3
   get image 2,0,0,32,32
   cls
return

`draw the level
draw_level:
for y = 1 to 10
   for x = 1 to 10
      if square(x,y) = 1
         paste image 1,x*33,y*33
         stilex = x
         stiley = y
      endif
   next x
next y

return

`crontrol the updating and movement of the sprite
sprite_control:
   sprite 1,charx,chary#,2

   gosub movement
return

`movement subroutine
movement:
   if leftkey()
      charx = charx - 1
   endif
   if rightkey()
      charx = charx +1
   endif

   if point(charx,chary#) = rgb(255,0,0)
      charx = charx + 1
   endif
   if point(charx+32,chary#) = rgb(255,0,0)
      charx = charx - 1
   endif

   gosub jumping
return

`jumping subroutine
jumping:
   if point(charx+16,chary#+33) = rgb(255,0,0)
      onground = 1
      falling = 0
   else
      falling = 1
      onground = 0
   endif

   if falling
      velocity# = velocity# + gravity#
   else
      velocity# = 0
   endif

   `jumping
   if spacekey() and onground
      velocity# = velocity# - power#
      falling = 1
   endif

   chary# = chary# + velocity#
return


`_________________________
REM DATA
`_________________________
map:
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,1,0,0,1
data 1,0,0,0,0,1,0,0,0,1
data 1,0,0,0,1,0,0,0,0,1
data 1,0,0,1,0,0,0,0,0,1
data 1,0,1,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,1,1,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,3,0,1
data 1,1,1,1,1,1,1,1,1,1

So anyone have any ideas on how to better the collision?
oh and any tips on how to clean up my code are welcome too

Cheers, BC
oh and Merry Christmas!!!

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Veron

17

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Joined: 22nd Nov 2006

Location:

Posted: 24th Dec 2009 12:34

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Nice to see another Aussie on the forums! Damn you being on holidays - I get the weekend off, that's it.

Anyway for collision, look into using the SPRITE HIT command. For example, if the sprite for the player hits the sprite for a wall or something, then the player stops moving. You could do the same thing for falling - if you're not colliding with the floor sprites, then move the sprite downwards until you are.

Having said all that - i'm not the greatest with 2D.

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Binary Coder

17

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Joined: 26th Feb 2007

Location: Queensland, Australia

Posted: 26th Dec 2009 08:30

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Not too many of us around is there? lol I'm on holidays from school

I thought of that one, although, im only using a sprite for the player character. The rest are just images pasted to the screen. Thanks helping out though

I think I may have heard of collision based on arrays or something? Is that a possible solution? Does anyone know how this may be done?

Cheers,BC

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Hodgey

14

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Joined: 10th Oct 2009

Location: Australia

Posted: 27th Dec 2009 23:52

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Hey, enjoying your holidays?

I am on holidays as well.

Anyway, I have seen from other threads that both the 'sprite collision' and 'sprite hit' commands don't work and I have tried both of them to no sucess, for pixel perfect collision anyway. For pixel perfect collision I use eXtends commands. They do the job pretty well.

Here is the link

http://darkbasicpro.thegamecreators.com/?f=extends

Hope this helps

A clever person solves a problem, a wise person avoids it - Albert Einstein

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Binary Coder

17

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Joined: 26th Feb 2007

Location: Queensland, Australia

Posted: 28th Dec 2009 03:46 Edited at: 28th Dec 2009 04:00

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Yeah, enjoying them, if a little boring

Wow, thanks for the link I will definately look into it

Having pixel perfect collision will definately be a great thing to have.

Otherwise, does anyone know how i may be able to find the current tile of the player sprite? That way i may be able to find the adjacent tiles around it, and go from there. Is that a good alternative?

Cheers, BC

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=PRoF=

21

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Joined: 17th Mar 2003

Location: Milton Keynes, UK

Posted: 28th Dec 2009 11:38 Edited at: 28th Dec 2009 12:21

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I'm certain that if you check the code snippets board you'll find at least a couple of ways of doing this without plugins.

I just did a quick search (using the search box at the bottom) for "pixel perfect" and there were indeed at least 2 examples there.

I would link you but I'm using my mobile phone atm.

I remember looking into this years ago and I remember seeing an example using memblocks to do it.

Sorry thats all a bit vague

>edit<

here is one example

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Binary Coder

17

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Joined: 26th Feb 2007

Location: Queensland, Australia

Posted: 29th Dec 2009 10:22 Edited at: 29th Dec 2009 11:31

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Thank you very much for that example of pixel perfect collision

Unfortunately I have no understanding of memblocks at this stage. Definately look into it when i have that down though. Thanks very much.

I wrote up a quick snipet today to test out something I had in mind for finding the adjacent tiles.

sync on : sync rate 60
set display mode 800,600,16

gosub _variables
gosub _makeimages
gosub _readdata

do
   cls
   gosub _displaymap
   gosub _makechar
   sync
loop

wait key

_variables:
   mapwidth = 10
   mapheight = 10
   tilesize = 32
   dim map(mapwidth,mapheight)
   charx = 64
   chary = 64
   sproffset = 16
   `currentx ( the current x tile of the character )
   `currenty ( the current y tile of the character )
return

_makeimages:
   cls rgb(255,255,0)
   get image 1,0,0,32,32
   cls rgb(0,0,255)
   get image 2,0,0,32,32
   cls
return

_readdata:
   restore map
   for y = 1 to mapheight
      for x = 1 to mapwidth
         read tileno
         map(x,y) = tileno
      next x
   next y
return

_displaymap:
   for y = 1 to mapheight
      for x = 1 to mapwidth
         if map(x,y) = 1
            paste image 2,x*tilesize,y*tilesize
         endif
      next x
   next y
return

_makechar:
   if upkey()
      chary = chary-1
   endif
   if downkey()
      chary = chary+1
   endif
   if rightkey()
      charx = charx + 1
   endif
   if leftkey()
      charx = charx - 1
   endif

`the tile numbers of each corner of the sprite
   topleftx = charx/tilesize
   toplefty = chary/tilesize

bottomleftx = charx/tilesize
   bottomlefty = (chary+tilesize)/tilesize

toprightx = (charx+tilesize)/tilesize
   toprighty = chary/tilesize

bottomrightx = (charx+tilesize)/tilesize
   bottomrighty = (chary+tilesize)/tilesize

print "topleft:";topleftx;",";toplefty
   print "bottomleft:";bottomleftx;",";bottomlefty
   print "topright:";toprightx;",";toprighty
   print "bottomright:";bottomrightx;",";bottomrighty

sprite 1,charx,chary,1
return

`_________________________
REM DATA
`_________________________
map:
data 1,1,1,1,1,1,1,1,1,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,1,1,1,1,1,1,1,1,1

+ Code Snippet

sync on : sync rate 60
set display mode 800,600,16

gosub _variables
gosub _makeimages
gosub _readdata

do
   cls
   gosub _displaymap
   gosub _makechar
   sync
loop


wait key

_variables:
   mapwidth = 10
   mapheight = 10
   tilesize = 32
   dim map(mapwidth,mapheight)
   charx = 64
   chary = 64
   sproffset = 16
   `currentx ( the current x tile of the character )
   `currenty ( the current y tile of the character )
return

_makeimages:
   cls rgb(255,255,0)
   get image 1,0,0,32,32
   cls rgb(0,0,255)
   get image 2,0,0,32,32
   cls
return

_readdata:
   restore map
   for y = 1 to mapheight
      for x = 1 to mapwidth
         read tileno
         map(x,y) = tileno
      next x
   next y
return

_displaymap:
   for y = 1 to mapheight
      for x = 1 to mapwidth
         if map(x,y) = 1
            paste image 2,x*tilesize,y*tilesize
         endif
      next x
   next y
return

_makechar:
   if upkey()
      chary = chary-1
   endif
   if downkey()
      chary = chary+1
   endif
   if rightkey()
      charx = charx + 1
   endif
   if leftkey()
      charx = charx - 1
   endif

   `the tile numbers of each corner of the sprite
   topleftx = charx/tilesize
   toplefty = chary/tilesize

   bottomleftx = charx/tilesize
   bottomlefty = (chary+tilesize)/tilesize

   toprightx = (charx+tilesize)/tilesize
   toprighty = chary/tilesize

   bottomrightx = (charx+tilesize)/tilesize
   bottomrighty = (chary+tilesize)/tilesize

   print "topleft:";topleftx;",";toplefty
   print "bottomleft:";bottomleftx;",";bottomlefty
   print "topright:";toprightx;",";toprighty
   print "bottomright:";bottomrightx;",";bottomrighty

   sprite 1,charx,chary,1
return


`_________________________
REM DATA
`_________________________
map:
data 1,1,1,1,1,1,1,1,1,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,1,1,1,1,1,1,1,1,1

So thats what I have so far. It finds the four corners of the sprite, and what tile they currently occupy.

Any feedback?

EDIT: I just coded up this subroutine that sorta handles the collision. It seems like an overly tedious way to do this. Is there any other way?

+ Code Snippet

_collision:
   if map(topleftx,toplefty) = 1 and map(bottomleftx,bottomlefty) = 1
      if map(toprightx,toprighty) = 0 and map(bottomrightx,bottomrighty) = 0
         charx = charx + 1
      endif
   endif
   if map(toprightx,toprighty) = 1 and map(bottomrightx,bottomrighty) = 1
      if map(topleftx,toplefty) = 0 and map(bottomleftx,bottomlefty) = 0
         charx = charx - 1
      endif
   endif
   if map(topleftx,toplefty) = 1 and map(toprightx,toprighty) = 1
      if map(bottomleftx,bottomlefty) = 0 and map(bottomrightx,bottomrighty) = 0
         chary = chary + 1
      endif
   endif
   if map(bottomleftx,bottomlefty) = 1 and map(bottomrightx,bottomrighty) = 1
      if map(topleftx,toplefty) = 0 and map(toprightx,toprighty) = 0
         chary = chary - 1
      endif
   endif
return

Cheers, BC

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Binary Coder

17

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Joined: 26th Feb 2007

Location: Queensland, Australia

Posted: 2nd Jan 2010 14:55 Edited at: 2nd Jan 2010 14:56

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Sorry for the double post.

Does anyone have any feedback? Any ideas on how to check the tiles around the character?

BC

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LBFN

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Joined: 7th Apr 2007

Location: USA

Posted: 3rd Jan 2010 16:52 Edited at: 3rd Jan 2010 16:54

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I checked your quick snippet and made a few edits. This makes a few blocks in the center and then allows you to move around with proper collision.

sync on : sync rate 60
set display mode 800,600,16
hide mouse : backdrop on : color backdrop 0
gosub _variables
gosub _makeimages
gosub _readdata
disable escapekey
repeat
   gosub _displaymap
   gosub _makechar
   sync
until spacekey() = 1 or keystate(1) = 1
enable escapekey
for i = 1 to 2 : delete image i : next i
undim map()
delete sprite 1
show mouse
end

_variables:
   mapwidth = 9
   mapheight = 9
   tilesize = 32
   dim map(mapwidth,mapheight)
   charx = 96
   chary = 96
   sproffset = 16
   `currentx ( the current x tile of the character )
   `currenty ( the current y tile of the character )
return

_makeimages:
   cls rgb(255,255,0)
   get image 2,0,0,32,32
   cls rgb(0,0,255)
   get image 1,0,0,32,32
   cls 0
return

_readdata:
   restore map
   for y = 0 to mapheight
      for x = 0 to mapwidth
         read map(x,y)
      next x
   next y
return

_displaymap:
   for y = 0 to mapheight
      for x = 0 to mapwidth
         if map(x,y) > 0
            paste image map(x,y),x*tilesize,y*tilesize
         endif
      next x
   next y
return

_makechar:
   `the tile numbers of each corner of the sprite
   topleftx = (charx)/tilesize
   toplefty = (chary)/tilesize

bottomleftx = (charx)/tilesize
   bottomlefty = (chary + tilesize - 1)/tilesize

toprightx = (charx + tilesize - 1)/tilesize
   toprighty = (chary)/tilesize

bottomrightx = (charx + tilesize - 1)/tilesize
   bottomrighty = (chary + tilesize - 1)/tilesize

text 330,10,"topleft    : " + str$(topleftx) + ", " + str$(toplefty)
   text 330,30,"bottomleft : " + str$(bottomleftx) + ", " + str$(bottomlefty)
   text 330,50,"topright   : " + str$(toprightx) + ", " + str$(toprighty)
   text 330,70,"bottomright: " + str$(bottomrightx) + ", " + str$(bottomrighty)
   text 10,350,"map(tlx,tly) = " + str$(map(tlx,tly))
   text 10,370,"map(trx,try) = " + str$(map(trx,try))
   text 10,390,"map(blx,bly) = " + str$(map(blx,bly))
   text 10,410,"map(brx,bry) = " + str$(map(brx,bry))

tlx = topleftx : trx = toprightx
   blx = bottomleftx : brx = bottomrightx
   tly = toplefty : try = toprighty
   bly = bottomlefty : bry = bottomrighty
   if tlx > 0 and tlx < 10 and tly > 0 and tly < 10
     if upkey() and map(tlx,tly) = 0 and map(trx,try) = 0
       t = chary - 1 : t = (t) / tilesize : tly = t : try = t
       if map(tlx,tly) = 0 and map(trx,try) = 0 then dec chary
     endif
     if downkey() and map(blx,bly) = 0 and map(brx,bry) = 0
       t = chary + 1 : t = (t + tilesize - 1) / tilesize : bly = t : bry = t
       if map(blx,bly) = 0 and map(brx,bry) = 0 then inc chary
     endif
     if rightkey() and map(trx,try) = 0 and map(brx,bry) = 0
       t = charx + 1 : t = (t + tilesize - 1) / tilesize : trx = t : brx = t
       if map(trx,try) = 0 and map(brx,bry) = 0 then inc charx
     endif
     if leftkey() and map(tlx,tly) = 0 and map(blx,bly) = 0
       t = charx - 1 : t = (t) / tilesize : tlx = t : blx = t
       if map(tlx,tly) = 0 and map(blx,bly) = 0 then dec charx
     endif
   endif
   sprite 1,charx,chary,2
return

`_________________________
REM DATA
`_________________________
map:
data 1,1,1,1,1,1,1,1,1,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,1,1,1,0,1
data 1,0,0,0,1,0,0,0,0,1
data 1,0,0,1,0,0,0,0,0,1
data 1,0,1,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,1,1,1,1,1,1,1,1,1

+ Code Snippet

sync on : sync rate 60
set display mode 800,600,16
hide mouse : backdrop on : color backdrop 0
gosub _variables
gosub _makeimages
gosub _readdata
disable escapekey
repeat
   gosub _displaymap
   gosub _makechar
   sync
until spacekey() = 1 or keystate(1) = 1
enable escapekey
for i = 1 to 2 : delete image i : next i
undim map()
delete sprite 1
show mouse
end

_variables:
   mapwidth = 9
   mapheight = 9
   tilesize = 32
   dim map(mapwidth,mapheight)
   charx = 96
   chary = 96
   sproffset = 16
   `currentx ( the current x tile of the character )
   `currenty ( the current y tile of the character )
return

_makeimages:
   cls rgb(255,255,0)
   get image 2,0,0,32,32
   cls rgb(0,0,255)
   get image 1,0,0,32,32
   cls 0
return

_readdata:
   restore map
   for y = 0 to mapheight
      for x = 0 to mapwidth
         read map(x,y)
      next x
   next y
return

_displaymap:
   for y = 0 to mapheight
      for x = 0 to mapwidth
         if map(x,y) > 0
            paste image map(x,y),x*tilesize,y*tilesize
         endif
      next x
   next y
return

_makechar:
   `the tile numbers of each corner of the sprite
   topleftx = (charx)/tilesize
   toplefty = (chary)/tilesize

   bottomleftx = (charx)/tilesize
   bottomlefty = (chary + tilesize - 1)/tilesize

   toprightx = (charx + tilesize - 1)/tilesize
   toprighty = (chary)/tilesize

   bottomrightx = (charx + tilesize - 1)/tilesize
   bottomrighty = (chary + tilesize - 1)/tilesize

   text 330,10,"topleft    : " + str$(topleftx) + ", " + str$(toplefty)
   text 330,30,"bottomleft : " + str$(bottomleftx) + ", " + str$(bottomlefty)
   text 330,50,"topright   : " + str$(toprightx) + ", " + str$(toprighty)
   text 330,70,"bottomright: " + str$(bottomrightx) + ", " + str$(bottomrighty)
   text 10,350,"map(tlx,tly) = " + str$(map(tlx,tly))
   text 10,370,"map(trx,try) = " + str$(map(trx,try))
   text 10,390,"map(blx,bly) = " + str$(map(blx,bly))
   text 10,410,"map(brx,bry) = " + str$(map(brx,bry))

   tlx = topleftx : trx = toprightx
   blx = bottomleftx : brx = bottomrightx
   tly = toplefty : try = toprighty
   bly = bottomlefty : bry = bottomrighty
   if tlx > 0 and tlx < 10 and tly > 0 and tly < 10
     if upkey() and map(tlx,tly) = 0 and map(trx,try) = 0
       t = chary - 1 : t = (t) / tilesize : tly = t : try = t
       if map(tlx,tly) = 0 and map(trx,try) = 0 then dec chary
     endif
     if downkey() and map(blx,bly) = 0 and map(brx,bry) = 0
       t = chary + 1 : t = (t + tilesize - 1) / tilesize : bly = t : bry = t
       if map(blx,bly) = 0 and map(brx,bry) = 0 then inc chary
     endif
     if rightkey() and map(trx,try) = 0 and map(brx,bry) = 0
       t = charx + 1 : t = (t + tilesize - 1) / tilesize : trx = t : brx = t
       if map(trx,try) = 0 and map(brx,bry) = 0 then inc charx
     endif
     if leftkey() and map(tlx,tly) = 0 and map(blx,bly) = 0
       t = charx - 1 : t = (t) / tilesize : tlx = t : blx = t
       if map(tlx,tly) = 0 and map(blx,bly) = 0 then dec charx
     endif
   endif
   sprite 1,charx,chary,2
return


`_________________________
REM DATA
`_________________________
map:
data 1,1,1,1,1,1,1,1,1,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,0,0,0,0,1,1,1,0,1
data 1,0,0,0,1,0,0,0,0,1
data 1,0,0,1,0,0,0,0,0,1
data 1,0,1,0,0,0,0,0,0,1
data 1,0,0,0,0,0,0,0,0,1
data 1,1,1,1,1,1,1,1,1,1

Hope this is helpful,

LB

So many games to code......so little time.

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Binary Coder

17

Years of Service

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Joined: 26th Feb 2007

Location: Queensland, Australia

Posted: 5th Jan 2010 23:39

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Thank you! Thats what I was looking for. So it would be the same idea when implementing into a platform game?

BC

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LBFN

17

Years of Service

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Joined: 7th Apr 2007

Location: USA

Posted: 6th Jan 2010 17:37

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You're welcome.

Sure, code similar to this could be used to make a platform game. Bear in mind that it is based upon square tiles, so if you have a graphic that does not take up the entire square, your collision will not be pixel-perfect. You should be able to design something that would work, though.

So many games to code......so little time.

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