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Task/Colour-bars-Display/Sidef/colour-bars-display.sidef

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+require('GD');
+
+var colors = Hash.new(
+              white   => [255, 255, 255],
+              red     => [255, 0,   0],
+              green   => [0,   255, 0],
+              blue    => [0,   0,   255],
+              magenta => [255, 0,   255],
+              yellow  => [255, 255, 0],
+              cyan    => [0,   255, 255],
+              black   => [0,   0,   0],
+             );
+
+var barwidth = 160/8;
+var image    = %s'GD::Image'.new(160, 100);
+var start    = 0;
+
+colors.values.each { |rgb|
+    var paintcolor = image.colorAllocate(rgb...);
+    image.filledRectangle(start * barwidth, 0, start*barwidth + barwidth - 1, 99, paintcolor);
+    start++;
+};
+
+%f'colorbars.png'.open('>:raw').print(image.png);