some equation help?

[Crusader]

I've made this grid below:

[0,0] [0,1] [0,2] [0,3] [0,4] [0,5] [0,6] [0,7] [0,8] [0,9]
[1,0] [1,1] [1,2] [1,3] [1,4] [1,5] [1,6] [1,7] [1,8] [1,9]
[2,0] [2,1] [2,2] [2,3] [2,4] [2,5] [2,6] [2,7] [2,8] [2,9]
[3,0] [3,1] [3,2] [3,3] [3,4] [3,5] [3,6] [3,7] [3,8] [3,9]
[4,0] [4,1] [4,2] [4,3] [4,4] [4,5] [4,6] [4,7] [4,8] [4,9]
[5,0] [5,1] [5,2] [5,3] [5,4] [5,5] [5,6] [5,7] [5,8] [5,9]
[6,0] [6,1] [6,2] [6,3] [6,4] [6,5] [6,6] [6,7] [6,8] [6,9]
[7,0] [7,1] [7,2] [7,3] [7,4] [7,5] [7,6] [7,7] [7,8] [7,9]
[8,0] [8,1] [8,2] [8,3] [8,4] [8,5] [8,6] [8,7] [8,8] [8,9]
[9,0] [9,1] [9,2] [9,3] [9,4] [9,5] [9,6] [9,7] [9,8] [9,9]

Course plotted to [3,2] from [6,4]. Distances: X(-2) Y(-3) .

Course plotted to [9,7] from [6,4]. Distances: X(3) Y(3) .

[code]<?php
function plotCourse($x,$y,$tX,$t_y){
$dX=($tX-$x);
$dY=($t_y-$y);
print 'Course plotted to ['.$tX.','.$t_y.'] from ['.$x.','.$y.']. Distances: X('.$dY.') Y('.$dX.') .';
}
?>[/code]


If, say, I started off in [6,4] and I'd like to go to [3,2] how would I calculate what other sectors I'd have to go through? I'd also like to know the same thing from [6,4] to [9,7]. Going diagnolly isn't required but if you know how to do that, then that'd be cool too.

I've tried a few times to no avail so I'm asking for anyone's help here.

Thanks for any help!

Note: Edited by KenRbnsn to put code between [nobbc][code][/code][/nobbc] tags

[onlyican]

now this is easy

Say For example, you are at 6,4 and want to go to 9,7
First you need to do some maths

[code]
<?php
//First, tell the code the co-ordinates;
$start_at = "6,4";
$end_at = "9,7";

//Now we want the X and Y location seperate;
$start_exp = explode(",",$start_at);
$start_x = $start_exp[0]; //Should be 6
$start_y = $start_exp[1]; //Should be 4

$end_exp = explode(",",$end_at);
$end_x = $end_exp[0]; //SHould be 9
$end_y = $end_exp[1]; //Should be 7


//We are going to do basic Maths Way
//Along the corridor and up the stairs
//First X, then Y

//Lets set up some vars
//Makes for easier debugging

$x_route = array();
$y_route = array();

//Now, if Start is BEFORE End
//We want to add one to X till we reach End of X
if($start_x < $end_x){
for($start = $start_x; $start <= $end_x; $start++){
$x_route[] = $start.",".$start_y;
}
}else{
//If start X is Greater than End X
//We want to Take one of X
if($start_x > $end_x){
for($start = $start_x; $start >= $end_x; $start--){
$x_route[] = $start.",".$start_y;
}
}else{
//The only other option is if start_x and end_x are the same
//Therefor, you dont need to move along X
$x_route[] = $start_x.",".$start_y;
}
?>
[/code]

If you do the Same for Y route, following the idea
Then you should have the 2 arrays, with the locations between Start and End

You can create them as one array, by calling the array something like moves

Depends what you want it for

[Crusader]

Thanks, I'll give it in a bit!