How to scroll map with player?

Blitz3D Forums/Blitz3D Programming/How to scroll map with player?

Guy Fawkes

(Posted 2012) [#1]

Hi all, using this code, and these 2 functions, how can I combine this tile scrolling demo, with these 2 functions which read from a file, and load the world, as opposed to reading from an image for loading the world?

Functions:

Function loadmap()
	f=OpenFile("lvl1.map")
	
	For y=0 To 24
		For x=0 To 32
			i=ReadInt(f)
			map(x,y)=i
		Next ;x
	Next ;y
	
	For y=0 To 24
		For x=0 To 32
			i=ReadInt(f)
			mapcol(x,y)=i
		Next ;x
	Next ;y
	
	magicnumber = ReadInt(f)
	
	musicloc$ = ReadString(f)
	
	;chn=LoadSound(musicloc$)
	
	;LoopSound chn
	
	;sndchn=PlaySound(chn)
	
	;ChannelVolume sndchn, .5

	CloseFile f
End Function



Function showmap()
For x=0 To mapx
	For y=0 To mapy
    DrawImage tiles,x*32,y*32,map(x,y)	
	Next	
Next
End Function

The tile demo:

Graphics 800,600
SetBuffer BackBuffer()

;maptest.bmp simply has 2 tiles 64x64 - they're different to
;show their movement

Global world=LoadAnimImage("maptest.bmp",64,64,0,2)

; a tilemap of 20x20 has 400 elements

Dim mapx(400),mapy(400),mapimg(400)

;load the images to be a checkerboard effect

aa=0 : bb=0 : cc=0
For ll=0 To 19
bb=cc
For kk=0 To 19
mapimg(aa)=bb
aa=aa+1
bb=bb+1
If bb=2 Then bb=0
Next
cc=cc+1
If cc=2 Then cc=0
Next 

;load the positions of the tiles into the grid
;so you start in the middle of the grid

xx=-192 : yy=-320 : aa=0
For ll=0 To 19
For kk=0 To 19
mapx(aa)=xx

mapy(aa)=yy
xx=xx+64
aa=aa+1
Next 
xx=-192 : yy=yy+64
Next 

Repeat

Cls

For ll=0 To 399
DrawBlock world,mapx(ll),mapy(ll),mapimg(ll)
Next 

;scroll up
If KeyDown(208) Then 
For ll=0 To 399
mapy(ll)=mapy(ll)-1
Next 
EndIf

;scroll down
If KeyDown(200) Then
For ll=0 To 399
mapy(ll)=mapy(ll)+1
Next
EndIf

;scroll right
If KeyDown(203) Then
For ll=0 To 399
mapx(ll)=mapx(ll)+1
Next
EndIf

;scroll left
If KeyDown(205) Then
For ll=0 To 399
mapx(ll)=mapx(ll)-1
Next
EndIf

Flip

Until KeyDown(1)
End

Unless, someone has an easier to use example of scrolling a map when a player walks, and reading the map from a file, as opposed to a loadanimimage?

Thank you to all who help! :)

Kryzon

(Posted 2012) [#2]

Yo. Quoting me from a thread you made:

Take that link to the BlitzCoder articles and have at them, especially the ones by Krylar.

Let's see where this information would lead you...

http://web.archive.org/web/20051122203122/http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=gamekrylar01282001.html

..."Moving sprites on tiled backgrounds"?! This seems interesting.

What I find to be awesome is that Web.Archives manages to snapshot the downloadable demos as well, so we can run the code in each of those articles as they were meant to.
Anyway, you can use the main article list to find the rest of them: http://web.archive.org/web/20051124131921/http://www.blitzcoder.com/articles.shtml

Guy Fawkes

(Posted 2012) [#3]

::EDIT::

Thanks, Kryzon! :) For those of u who need help making a 2D RPG like me, I did a WAY-WAY-BACK of the waybackmachine link Kryzon kindly gave me, instead of 2007, I went back to 2004, and THIS is what I found:

Article:

http://web.archive.org/web/20040808051633/http://www.blitzcoder.com/cgi-bin/articles/show_article.pl?f=krylar07192004002127.html

Example:

http://web.archive.org/web/20040808051633/http://www.blitzcoder.com/cgi-bin/articles/show_article2.pl?f=krylar07192004002127.html

Thanks again, Kryzon! :)

Last edited 2012