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Okay. So first thing's first, this is SO NOT for beginners. It is at least for an intermediate programmer. But for all of you listening anyway, here we go.

So, first, we do what we usually do at the beginning of a program.

ACLS:CLEAR

Now we need to dim the map.

DIM MAP(32,24)

Simple, right? Now we put on the cool music.

BGMPLAY 29

Okay! Now we restore where we want to read the data!

RESTORE @MAP

Good, good. Now the first FOR command.

FOR J=0 TO 31

The J should equal the X map coordinate, minus one. Same with the I for command for Y.

READ MAP$
FOR I=0 TO 23

Now... the hard part.

 MAP(I,J)=0

 IF MID$(MAP,I,1)=="+"  THEN MAP(I,J)=1

 IF MID$(MAP,I,1)=="-" THEN MAP(I,J)=2

 IF MAP(I,J)==1 THEN  BGPUT 0,I,J,32,9,0,0

 IF MAP(I,J)==2 THEN BGPUT 0,I,J,32,0,0,0

Now, the first command makes every map coordinate 0. The second and third command say "if the data reads '+' then that coordinate is stored as one." Same with the other one and 2. The last two commands state, "if the map coordinate is 1, it put a grass block down in the coordinate, and if it reads 2, it will put down a dead grass. But now we put down the map data.

@MAP
 DATA "

 DATA "

 DATA"

 DATA"

 DATA"

 DATA"

 DATA"

 DATA"

 DATA"

 DATA"

 DATA"

 DATA"

 DATA"++++++++++++++++-+++++++++++++++++--++++++++++++++++++++++-----++++++++++++++++++++++++++++++++++++++

 DATA"-------+++++++++----------------+++---------++++++++++++++--------++++-------------------------------

 DATA"-----------++--------------------+-----------+++++++---------------++--------------------------------

 DATA"-----------------------------------------------------------------------------------------------

 DATA"-----------------------------------------------------------------------------------------------

 DATA"-----------------------------------------------------------------------------------------------

 DATA"-----------------------------------------------------------------------------------------------

 DATA"-----------------------------------------------------------------------------------------------

 DATA"-----------------------------------------------------------------------------------------------

 DATA"-----------------------------------------------------------------------------------------------

Now, this exceeds the limit of the dim command, so everything outside of the limit won't be printed.

Thanks for reading! Click here for part 2: http://petitcomputer.wikia.com/wiki/How_to_make_a_simple_collision_(Part_2)

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