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

CHANGELOG.md

@@ -1,5 +1,8 @@
 # Squib CHANGELOG
 
+## v0.3.0a
+* Added new sample table for color constants in `samples/colors.rb`
+
 ## v0.2.0
 * Added `showcase` feature to create a fancy-looking 3D reflection to showcase your cards. Documented, tested, and added a sample for it.
 * Added a basic Rakefile, documented in README.

README.md

@@ -159,7 +159,7 @@ Colors can be specified in a wide variety of ways, mostly in a hex-string. Take
 
 {include:file:samples/colors.rb}
 
-Under the hood, Squib uses the `rcairo` [color parser](https://github.com/rcairo/rcairo/blob/master/lib/cairo/color.rb) to accept a variety of color specifications, along with over [300 pre-defined constants](https://github.com/rcairo/rcairo/blob/master/lib/cairo/colors.rb).
+Under the hood, Squib uses the `rcairo` [color parser](https://github.com/rcairo/rcairo/blob/master/lib/cairo/color.rb) to accept a variety of color specifications, along with over [300 pre-defined constants](https://github.com/rcairo/rcairo/blob/master/lib/cairo/colors.rb). The above sample will generate a table of such constants.
 
 ## Specifying Files
 

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