Hi - I usually use this function to detect whether two vectors have crossed - but in haxe it’s no longer working.

Could any math boffin-types figure out why ? The s & t calculations have always foxed me, but they worked before and now that don’t ! Does haxe handle these kinds of calculations differently ?

```
// passes in 2 sets of co-rds for each vector ..
public static function collCheck(xp1:Float, xp2:Float, yp1:Float, yp2:Float, xp3:Float, xp4:Float, yp3:Float, yp4:Float)
{
var S1x = xp2-xp1;
var S1y = yp2-yp1;
var S2x = xp4-xp3;
var S2y = yp4-yp3;
var s = (-S1y*(xp1-xp3)+S1x*(yp1-yp3))/(-S2x*S1y+S1x*S2y);
var t = (S2x*(yp1-yp3)-S2y*(xp1-xp3))/(-S2x*S1y+S1x*S2y);
var retVal = -1;
if ((s>0) && (s<1) && (t>0) && (t<1))
{
// a collision between the two lines has occurred
var retVal = t;
}
return retVal;
}
```