Added a a sample table for showing the built-in color constants

samples/colors.rb

@@ -11,6 +11,23 @@ Squib::Deck.new(width: 825, height: 1125, cards: 1) do
   text color: '#ffff00000000', str: '12-hex', x: 50, y: y+=50
   text color: '#ffff000000009999', str: '12-hex (alpha)', x: 50, y: y+=50
   text color: :burnt_orange, str: 'Symbols of constants too', x: 50, y: y+=50
-
   save_png prefix: 'colors_'
 end
+
+# This script generates a table of the built-in constants
+Squib::Deck.new(width: 3000, height: 1500) do
+  colors = (Cairo::Color.constants - %i(HEX_RE Base RGB CMYK HSV X11))
+  colors.sort_by! {|c| Cairo::Color.parse(c).to_s}
+  x,y,w,h = 0,0,300,50
+  colors.each_with_index do |color, i|
+    rect x: x, y: y, width: w, height: h, fill_color: color
+    text str: color.to_s, x: x + 5, y: y+13, font: 'Sans Bold 16',
+         color: (Cairo::Color.parse(color).to_hsv.v > 0.9) ? '#000': '#fff'
+    y += h
+    if y > @height
+      x += w
+      y = 0
+    end
+  end
+  save_png prefix: 'color_constants_'
+end