Images along a line

[callimuc]

I wanted to ask, how you could show images along a line. Let´s say my line starts from:
x: 2
y: 3

and ends at:
x: 50
y: 36

I know how I could use it with a poly.

PHP Code:

showpoly(200, {x1, y1, x2, y2}); 


What I want is to have images along that line. That´s also not hard since I could stretch an Image (in case the length doesn´t match)

but how could I have, lets say a 16x16 pixel image, shown over and over on that line without stretching it?
Examples below (done in Paint.NET)



I thought I had seen such a script around but couldn´t find it anymore. Can anyone of you help me?