Isometric Grid

Can someone please set me straight with this, I am attempting to create an isometric grid on the full screen with a spacing of 10 pix on the X an Y. In the end I am wanting to save the screen out as a BMP file which I can then import into a cad drawing package to use as a background of a drawing frame.

Graphics 800,600

x#=0
y#=0

Color 0,255,0

For x#=0 To 800
For y#=0 To 600
If x# Mod 10=0
If y# Mod 10=0
Plot (x#-y#),((x#+y#)/2)
EndIf
EndIf
Next
Next

While Not KeyHit(1)
Wend

What am I doing wrong with this?

Thanks
Luna.

Try this:

Graphics 800,600
SetBuffer BackBuffer()
Color 0,255,0 

For x=0 To 800 Step 10 
	For y= 5 To 595 Step 5
		;(y and 1) checks if y is an odd number
		If y And 1 Then
			Plot x+5,y
		Else
			Plot x, y
		End If
	Next 
Next 

Flip
WaitKey() 
End

Your code will make a 45 degree x 45 degree isometric grid. Most games use a 60 degree x 120 degree iso grid. Something like this:

Graphics 800,600
SetBuffer BackBuffer()
Color 0,255,0 

For x = 0 To 800 Step 10
	For y = 3 To 600 Step 3
		If y And 1 Then
			Plot x + 5, y
		Else
			Plot x, y
		End If
	Next
Next

Flip
WaitKey()
End

Soory to intrude but I tryed the code myself.. All little dots, I tryed thinking 4 dot = 1 square, but arent the square way to small >.<

id thought that isometric stuff was much bigger "looks at Diablo"

Thanks Andy,

I will print out both versions and see which looks best on paper.

Kaisuo,
What I needed was an isometric grid that I can import into a draughting package to use as a background on my isometric drawing frame, This would then help the people using the drawings to get perspective of 3D while assembling there jobs.