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

by bliako (Monsignor)

on Mar 19, 2019 at 23:34 UTC ( [id://1231464]=note: print w/replies, xml )

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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;
       ...
[download]

bw, bliako

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Re^3: circular area in a coordinates grid (AoA) by LanX (Saint) 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}	[reply] [d/l] [select]
Re^3: circular area in a coordinates grid (AoA) by tybalt89 (Monsignor) 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 :)	[reply]
Re^4: circular area in a coordinates grid (AoA) by bliako (Monsignor) on Mar 20, 2019 at 01:14 UTC
sorry maybe my comment sounded a bit aggresive (but it wasn't meant to be).	[reply]

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