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### Re^2: circular area in a coordinates grid (AoA)

by bliako (Monsignor)
 on Mar 19, 2019 at 23:34 UTC ( #1231464=note: print w/replies, xml ) Need Help??

Cool! But that eval poked my eye.

The following can potentially save on some sqrt's too:

```    my \$delta_x = \$radius ** 2 - (\$center_r - \$row) ** 2;
if( \$delta_x >= 0 ){
\$delta_x = int sqrt \$delta_x;
...

bw, bliako

Replies are listed 'Best First'.
Re^3: circular area in a coordinates grid (AoA)
by LanX (Sage) on Mar 20, 2019 at 00:20 UTC
you can also get rid of both squares

x² = r²-y²

now increment y2=y+1

x2² = r²-(y+1)²

x2² = r²-y² - 2y - 1

x2² = x² - 2y -1

I'm too tired to get rid of the sqrt too now :)

Cheers Rolf
(addicted to the Perl Programming Language :)
Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

Re^3: circular area in a coordinates grid (AoA)
by tybalt89 (Prior) on Mar 19, 2019 at 23:53 UTC

Just having some fun :)

Nothing wrong with having a little fun in a "proof-of-concept" example, is there?
It's not like it's production code :)

sorry maybe my comment sounded a bit aggresive (but it wasn't meant to be).

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