Converting/casting cpp datatypes

[Balaras]

Hi,

I'm converting some cpp code to work in my pascal project.
(BjA¬?rn BergstrA¬?m's recursive shadowcasting)

The following line that casts from integer to double to integer, where xCenter is an integer:
int xStart=(int)((double)xCenter + 0.5 - (startSlope * distance));

xStart := Integer( Double(xCenter) + 0.5 - (startSlope * distance) ) yields an invalid typecast error.

So I though about doing something like this:
xStart := Round( xCenter + 0.5 - (StartSlope * distance) );

Would this give the correct result ?

Thanks,
Balaras

[technomage]

That should do the trick..but...if the origional code just returned the whole number without rounding (which I suspect it would) I would say use Trunc instead.

Dean

[Balaras]

Thanks Dean,

To truncate a real would be the equivallent of floor() right ?

Balaras

[technomage]

I think so.

[Clootie]

IIRC it should be:
xStart := TRUNC( xCenter + 0.5 - (StartSlope * distance) );

[Balaras]

Thanks both of you.