Code not working :-(

For some reason my code isn't working. Only 1 item in the array has the value 1 when the space is pressed, but for some reason it is drawing the whole grid of items.
I would be very grateful if someone could help :)

here is my code (The problem lies in the draw_world function)

Just copy and paste it then run it.

Graphics 800,600
SetBuffer BackBuffer()


Global world_x = 0
Global world_y = 0
Global world_width = 800
Global world_height = 600
Global grid_x = 0
Global grid_y = 0
Global grid_width = 9
Global grid_height = 9
Global tile_size = 50
Global cursor_x = 0 
Global cursor_y = 0


Dim world(world_width-1,world_height-1)

For x=0 To world_width-1
	For y=0 To world_height-1
		world(x,y)=0
	Next
Next



While Not KeyHit(1)
Cls

	user_control
	draw_world
	draw_grid
	
	Flip
	
Wend



Function draw_grid()

	For x=0 To grid_width
		For y=0 To grid_height
			Rect grid_x+x*tile_size,grid_y+y*tile_size,tile_size,tile_size,0
		Next
	Next

	Color 0,0,255
	Rect grid_x+cursor_x*tile_size,grid_y+cursor_y*tile_size,tile_size,tile_size,0
	Color 255,255,255

End Function 




Function draw_world()
	
	For x1=0 To grid_width
		For y1=0 To grid_height
			
			For x2=0 To 10
				For y2=0 To 10
					If world(x2,y2)=1 Then 
						Oval grid_x+x1*tile_size,grid_y+y1*tile_size,5,5
					EndIf
				Next
			Next
			
		Next
	Next
	
End Function



Function user_control()

	If KeyHit(205) And cursor_x<grid_width Then cursor_x = cursor_x + 1
	If KeyHit(203) And cursor_x>0 Then cursor_x = cursor_x - 1
	If KeyHit(200) And cursor_y>0 Then cursor_y = cursor_y - 1
	If KeyHit(208) And cursor_y<grid_height Then cursor_y = cursor_y + 1
	
	If KeyHit(57) Then world(0,0)=1
	
End Function

Thanks

I'm think you want this?

Graphics 800,600
SetBuffer BackBuffer()


Global world_x = 0
Global world_y = 0
Global world_width = 800
Global world_height = 600
Global grid_x = 0
Global grid_y = 0
Global grid_width = 9
Global grid_height = 9
Global tile_size = 50
Global cursor_x = 0 
Global cursor_y = 0


Dim world(world_width-1,world_height-1)

For x=0 To world_width-1
	For y=0 To world_height-1
		world(x,y)=0
	Next
Next



While Not KeyHit(1)
Cls

	user_control
	draw_world
	draw_grid
	
	Flip
	
Wend



Function draw_grid()

	For x=0 To grid_width
		For y=0 To grid_height
			Rect grid_x+x*tile_size,grid_y+y*tile_size,tile_size,tile_size,0
		Next
	Next

	Color 0,0,255
	Rect grid_x+cursor_x*tile_size,grid_y+cursor_y*tile_size,tile_size,tile_size,0
	Color 255,255,255

End Function 




Function draw_world()
	
	For x1=0 To grid_width
		For y1=0 To grid_height
			
			;For x2=0 To 10
				;For y2=0 To 10
					If world(x1,y1)=1 Then 
						Oval grid_x+x1*tile_size,grid_y+y1*tile_size,5,5
					EndIf
				;Next
			;Next
			
		Next
	Next
	
End Function



Function user_control()

	If KeyHit(205) And cursor_x<grid_width Then cursor_x = cursor_x + 1
	If KeyHit(203) And cursor_x>0 Then cursor_x = cursor_x - 1
	If KeyHit(200) And cursor_y>0 Then cursor_y = cursor_y - 1
	If KeyHit(208) And cursor_y<grid_height Then cursor_y = cursor_y + 1
	
	If KeyHit(57) Then world(cursor_x,cursor_y)=1
	
End Function

Thanks Luke :) How do i get it to scroll as well please?

Thanks

hey goldwing :o) How do you mean scroll? What are you wanting to scroll?

Hey Ross :) Well, i have the visible grid which is 10 tiles in length. Then you have the actual world width and length which are not visible. When you move along each tile, i want the world_x to increase by 1. When you get to the end of the grid, i want it to scroll and keep increasing the world_x whilst drawing the contents of that area when scrolling :)

A quick bit of messy code,
By the way what are you making?

Graphics 800,600
SetBuffer BackBuffer()


Global world_x = 0
Global world_y = 0

Global world_width = 800
Global world_height = 600


Global grid_x = 0 ;?
Global grid_y = 0 ;?
Global grid_width = 20
Global grid_height = 20


Global tile_size = 50
Global cursor_x = 0 
Global cursor_y = 0





Dim world(world_width-1,world_height-1)

For x=0 To world_width-1
	For y=0 To world_height-1
		world(x,y)=0
	Next
Next



While Not KeyHit(1)
Cls

	user_control
	draw_world
	draw_grid
	
	Flip
	
Wend



Function draw_grid()
	
	Origin -world_x,-world_y
	
	
	For x=0 To grid_width
		For y=0 To grid_height
			Rect grid_x+x*tile_size,grid_y+y*tile_size,tile_size,tile_size,0
			
			
			
		Next
	Next


	Color 0,0,255
	Rect grid_x+cursor_x*tile_size,grid_y+cursor_y*tile_size,tile_size,tile_size,0
	Color 255,255,255
	
	
End Function 



Function draw_world()
	
	Origin -world_x,-world_y
	
	For x=0 To grid_width
		For y=0 To grid_height
			
			If world(x,y)=1 Then 
				Oval grid_x+x*tile_size,grid_y+y*tile_size,5,5
			EndIf
			
			
		Next
	Next

End Function



Function user_control()
	Origin 0,0
	
	If KeyHit(205) And cursor_x<grid_width Then cursor_x = cursor_x + 1
	If KeyHit(203) And cursor_x>0 Then cursor_x = cursor_x - 1
	If KeyHit(200) And cursor_y>0 Then cursor_y = cursor_y - 1
	If KeyHit(208) And cursor_y<grid_height Then cursor_y = cursor_y + 1
	
	If KeyHit(57) Then world(cursor_x,cursor_y)=1
	
	
	;---Scrolling---
	
	If (cursor_x*tile_size)+tile_size-world_x > world_width-70 Then
		world_x=world_x+4
	End If
	
	If (cursor_x*tile_size)-world_x < 70 Then
		world_x=world_x-4
	End If
	
	
	
	If (cursor_y*tile_size)+tile_size-world_y > world_height-70 Then
		world_y=world_y+4
	End If
	
	If (cursor_y*tile_size)-world_y < 70 Then
		world_y=world_y-4
	End If
	
	
	
End Function

Thanks Luke :)
I am just trying to make an editor at the moment. After that, i hope to start working on a platform game thereafter :)
Thanks again