cool use of instance_eval

Author: monkstone

external_library/java/hype/color_presets.rb

@@ -0,0 +1,43 @@
+load_library :hype
+include_package 'hype'
+java_import 'hype.extended.layout.HGridLayout'
+# string color array
+PALETTE = %w(
+  CLEAR
+  WHITE
+  BLACK
+  LGREY
+  GREY
+  DGREY
+  RED
+  GREEN
+  BLUE
+  CYAN
+  YELLOW
+  MAGENTA
+).freeze
+# format string see fill below
+FSTRING = 'H::%s'.freeze
+
+def settings
+  size(640, 640)
+end
+
+def setup
+  sketch_title 'Color Presets'
+  H.init(self)
+  H.background(color('#242424'))
+  grid = HGridLayout.new(3).spacing(210, 157).start_loc(10, 10)
+  PALETTE.each do |col|
+    H.add(HRect.new(200, 147))
+     .stroke_weight(3)
+     .stroke(H::BLACK, 150.0) # Note we call hype constants
+     .fill(instance_eval(format(FSTRING, col))) # and using eval
+     .loc(grid.get_next_point)
+  end
+end
+
+def draw
+  H.draw_stage
+  no_loop
+end