termcol: original c64 colour values

[sheet.git] / termcol.plp

diff --git a/termcol.plp b/termcol.plp
index c7a257332e24f6a30c052302f7b028960d5878b4..4de11c6668c9383211ee4104d58dd43bc726c7ea 100644 (file)
--- a/termcol.plp
+++ b/termcol.plp
@@ -117,9 +117,27 @@ my %col = (
        ],
        c64 => [
                'C=64',  # commodore 64/128
-               map { Shiar_Sheet::Colour->newyuv($_)->rgb48 }
-               qw/008080 FF8080 4F4FF5 9FB00A 5FDADA 7F2525 3FFF80 BF0080
-                  5F25DA 3F0AB0 7F4FF5 4F8080 778080 BF2525 77FF80 9F8080 /
+               map {
+                       # 5-bit luma ± 2-bit colour angle
+                       my ($y, $neg, $hue) = split /(-)|\+/;
+
+                       # convert to yuv
+                       my ($u, $v) = (0, 0);
+                       if (defined $hue) {
+                               my $RAD = 3.14159;
+                               $hue *= $RAD / 8;
+                               $hue += $RAD if $neg;
+                               $u = cos $hue;
+                               $v = sin $hue;
+                       }
+
+                       # convert to rgb
+                       $y *= 255 / 32;
+                       $_ = $_ * 127.5 + 128 for $u, $v;
+                       Shiar_Sheet::Colour->newyuv($y, $u, $v)->rgb48;
+               }
+               qw/ 0    32  10+5 20-5 12+2 16-2 8+0  24-0
+                   12+6 8+7 16+5 10   15   24-2 15+0 20 /,
        ],
        msx => [
                'MSX',