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I'm new to Darkbasic, and on my third day of learning it, I've created this a "DEMO". But I don't know how to position my character in the middle of my matrix. Can somebody help? Also, how would I go about making an invisible border so that the character cannot go outside the matrix?

rem **************************
rem ** DEMO **
rem ** Created By: **
rem ** Martin vanPutten **
rem **************************

rem Start Up Screen.
cls
print "DEMO"
print "Created By: Martin vanPutten"
sleep 1000
print "Loading..."
sleep 5000

rem Setup Environment.
hide mouse
autocam off
sync on

rem Prepare Ground For The Matrix.
Load bitmap "Ground.bmp", 1
Get Image 1, 0, 0, 128, 128
Delete Bitmap 1

rem Create Ground.
Make Matrix 1, 10000, 10000, 15, 15
Prepare Matrix Texture 1, 1, 1, 1

rem Load Charecter.
load object "idle.x", 1 : append object "walk.x", 1, 100
yrotate object 1, 180 : fix object pivot 1
position object 1, 10000, 0, 10000
loop object 1, 0, 20 : set object speed 1, 5

rem Game Loop.
do

rem Variables.
aY# = Object angle Y(1)

rem Player Movement.
stage=0
if Leftkey() = 1 then a# = a# - 9.0 : a# = wrapvalue(aY# - 4.5)
if Rightkey() = 1 then a# = a# + 9.0 : a#=wrapvalue(aY# + 4.5)
if Upkey() = 1 then x# = NewxValue(x#, a#, +12) : z# = NewzValue(z#, a#, +12) : stage = 1
if Downkey() = 1 then x# = NewxValue(x#, a#, -12) : z# = NewzValue(z#, a#, -12) : stage = 1
position object 1, x#, 0.0, z#
yrotate object 1, a#

rem Controling Player Animation.
if stage <> oldstage
if stage = 0
set object frame 1, 0.0
loop object 1, 0, 20
set object speed 1, 10
endif
if stage = 1
set object frame 1, 105.0
loop object 1, 105, 125
set object speed 1, 40
endif
oldstage = stage
endif

rem Camera Control.
cZ# = Newzvalue(Z#, aY# - 180, 300)
cX# = Newxvalue(X#, aY# - 180, 300)
Position Camera cX#, 200, cZ#
Point camera X#, 150, Z#

rem Refresh Screen.
sync

rem End Game Loop.
loop

I'll help you!

Okay...
When you have a matrix, the positioning works differently. When you position a matrix, the bottom left CORNER goes on the point that you specify, but with objects, the CENTER of the object goes there. Got it? Good, now to answer yor question...

Now that that's out of the way, I can tell you how to position the object/character.

Alright, so what you need to do is put your object halfway into the matrix on the X and Z axis'. Don't you agree that halfway into the matrix on those two dimensions (X and Z) will give you the center?

You can find the halfway point on the X axis by dividing the matrix's X size (in your case 10000) by 2. Dividing by 2 gives half, correct? Same thing with the Z axis. Divide 10000 by 2.

So, if you keep your matrix where it is right now in your program, you should have ended up with "position object 1,5000,0,5000" You can change the 0, I'm sure you know what it is. It's the Y axis position. You'll see how this turns out. Anyway, to cut to the chase, your final position should be:

position object 1,5000,0,5000

That's it! Hope I helped.

I was just as surprised as you are.

you just place invisible objects ( cube, box, sphere,any really) at the edge... Of course that would require a collision system..

Just test the characters new position before you POSITION OBJECT.

If x or z are outside the bounds of the matrix, e.g. if <0 or >10000 then you reset the position back to what it was before you updated, and hey presto, your object stops moving.

Hope this helps!

Expanding the above suggestion

x#=object position x(1)
y#=object position y(1)
z#=object position z(1)
if x#>10000.0 then x#=10000.0
if z#>10000.0 then z#=10000.0
if x#<0.0 then x#=0.0
if z#<0.0 then z#=0.0
position object x#,y#,z#

Baggers:
Read my post - the code you have supplied is exactly what I suggested he do????? I never mentioned a collision system!

well look at that...sorry, god knows what I was smoking this morning then.
Sorry about that..editing in progress.

Cheers (and can you pass me one of whatever you were smoking?)