Vibrating rectangles: Difference between revisions
→{{header|Perl 6}}: Add an SDL2 graphics lib version
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=={{header|Perl 6}}==
{{works with|Rakudo|2018.06}}
===ANSI graphics===
Ok. The task description is essentially non-existent. In looking at the reference implementation (Ring) it seems like we are supposed to draw a series of concentric rectangles and then alter the colors step-wise. No actual vibration apparent.
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}</lang>
See: [https://github.com/thundergnat/rc/blob/master/img/vibrating-rectangles-perl6.gif Vibrating rectangles] (.gif image)
===SDL Animation===
Fully animated SDL2 graphics lib version. Will adjust rendered rectangles to fill resized windows. Hit the space bar to toggle palette rotation direction.
<lang perl6>use SDL2::Raw;
my $width = 1200;
my $height = 800;
SDL_Init(VIDEO);
my $window = SDL_CreateWindow(
'Vibrating rectangles',
SDL_WINDOWPOS_CENTERED_MASK,
SDL_WINDOWPOS_CENTERED_MASK,
$width, $height,
RESIZABLE
);
my $render = SDL_CreateRenderer($window, -1, ACCELERATED +| PRESENTVSYNC);
my $event = SDL_Event.new;
enum KEY_CODES (
K_SPACE => 44,
);
my $num = 80;
my @rgb = palette($num);
my ($cx, $cy);
my $dir = 1;
main: loop {
while SDL_PollEvent($event) {
my $casted_event = SDL_CastEvent($event);
given $casted_event {
when *.type == QUIT { last main }
when *.type == WINDOWEVENT {
if .event == 5 {
$width = .data1;
$height = .data2;
}
}
when *.type == KEYDOWN {
if KEY_CODES(.scancode) -> $comm {
given $comm {
when 'K_SPACE' { $dir *= -1; }
}
}
#say .scancode; # unknown key pressed
}
}
}
($cx, $cy) = $width div 2, $height div 2;
for 1..^$num {
my ($x, $y) = ($cx - ($width/2/$num*$_), $cy - ($height/2/$num*$_))».round;
my ($w, $h) = ($width/$num*$_, $height/$num*$_)».round;
SDL_SetRenderDrawColor($render, |@rgb[$_], 255);
SDL_RenderDrawRect($render, SDL_Rect.new(:x($x), :y($y), :w($w), :h($h)));
}
@rgb.=rotate($dir);
SDL_RenderPresent($render);
SDL_SetRenderDrawColor($render, 0, 0, 0, 0);
SDL_RenderClear($render);
}
SDL_Quit();
sub palette ($l) { (^$l).map: { hsv2rgb(($_ * 360/$l % 360)/360, 1, 1).list } };
sub hsv2rgb ( $h, $s, $v ){ # inputs normalized 0-1
my $c = $v * $s;
my $x = $c * (1 - abs( (($h*6) % 2) - 1 ) );
my $m = $v - $c;
my ($r, $g, $b) = do given $h {
when 0..^(1/6) { $c, $x, 0 }
when 1/6..^(1/3) { $x, $c, 0 }
when 1/3..^(1/2) { 0, $c, $x }
when 1/2..^(2/3) { 0, $x, $c }
when 2/3..^(5/6) { $x, 0, $c }
when 5/6..1 { $c, 0, $x }
}
( $r, $g, $b ).map: ((*+$m) * 255).Int
}</lang>
=={{header|Phix}}==
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