Array Me

[Wallfire 0]

im having trouble understanding the help file on arrays. could someone give me the low-down on arrays? like how to declare, how to define, when and where i can use them, etc...

i would like to grab points and store the X,Y locations in one array instead of having 2 varaibles to keep track of.

here is an example of when i would like to use an array:

GetPixelColor($ArrayPoint)

where $ArrayPoint is a (X,Y) cordinate.

[CyberSlug 3]

Hope this helps:

Dim $myCoord[2]

$myCoord[0] = 479
$myCoord[1] = 639

$color = GetPixelColor($myCoord)

MsgBox("4096","", "The color at my coordinate is " & $color)

Func GetPixelColor($point)
   If Not IsArray($point) Then
      MsgBox(4096,"Error", "GetPixelColor was not passed an array!")
   Else
      Return PixelGetColor ( $point[0] , $point[1] )
   EndIf
EndFunc

[Wallfire 0]

ok, great. thanks. i think i get it now, its pretty simple. i dont know why i couldnt grasp the concept before.

here is what i made, almost excatly like yours...just not with that array checking step. thats smart.

Dim $MyArray[2]

$MyArray[0]=10
$MyArray[1]=20


$color=PixelGetColor($MyArray[0],$MyArray[1])
MsgBox(4096,"Arraystuff:",$color,4)

Edited March 8, 2004 by Wallfire

[scriptkitty 0]

One other thing, and why to really use arrays, is that they can be called in loops.

Dim $MyArray[2]
$MyArray[0]="Blue"
$MyArray[1]="Red"

for $i=0 to 1
msgbox(1,"Color",$MyArray[$i])
next

You can also get more complex very easy:

Dim $MyArray[2][2]
$MyArray[0][0]="Blue"
$MyArray[1][0]="Red"
$MyArray[0][1]="Ocean"
$MyArray[1][1]="Stopsign"


for $i=0 to 1
msgbox(1,$MyArray[$i][0],$MyArray[$i][1])
next

a nice quick way to populate an array is using StringSplit:

$MyArray=StringSplit("Blue|Red","|"); create array
; this creates a 3 element array with the first element having the amount of elements besides itself. In this case $MyArray[0]=2
for $i=1 to $MyArray[0]
msgbox(1,"Color",$MyArray[$i])
next

[Wallfire 0]

hmm...yes, i can see where things can get complex with arrays.

one questiong tho:

when you did this:

$MyArray[0][0]="Blue"
$MyArray[1][0]="Red"
$MyArray[0][1]="Ocean"
$MyArray[1][1]="Stopsign"

is that 'populating?' a 2X2 array?

my only other programing language that i know is MATLAB and it doesnt use arrays, but matrices. that look like:

Matrix=[1 2;3 4]

that would make a matrix that looks like:

1 2
3 4

so when you do:

Dim $MyArray[2][2]

that is making a 2X2 empty array, (or 'matrix' in my thinking...)

what is the syntax on that? would Dim $MyArrat[3] [2] make a 3X2 or a 2X3?

and is this a 3X2?:

1 2 3
4 5 6

thanks again for explaining what you have so far, i tried teaching myself C a few months ago but got lost when it started talking about ararys and other stuff...im just not used to dealing with them.