#!/usr/bin/env perl
#
# draw what raycasts various circle functions produce
#
#   ./show-circle circle 6
#   ./show-circle cached_circle 6
#   ./show-circle swing_circle 6 0.4
use strict;
use warnings;
use Game::RaycastFOV qw(cached_circle circle raycast swing_circle);
die "Usage: $0 method radius [swing]\n" unless @ARGV >= 2;
my $method = shift;
my $radius = shift;
our @map;
our $MAX_X = 79;
our $MAX_Y = 24;
for my $y ( 0 .. $MAX_Y ) {
    for my $x ( 0 .. $MAX_X ) {
        $map[$y][$x] = '.';
    }
}
raycast(
    \&{$method},
    sub {
        my ( $lx, $ly ) = @_;
        return -1 if $lx < 0 or $lx >= $MAX_X or $ly < 0 or $ly >= $MAX_Y;
        $map[$ly][$lx] = '#';
        return 1;
    },
    40,
    12,
    $radius,
    $method eq 'swing_circle' ? shift() : ()
);
for my $y ( 0 .. $MAX_Y ) { print join( '', $map[$y]->@* ), "\n" }