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Task/Sierpinski-triangle-Graphical/Sidef/sierpinski-triangle-graphical.sidef

@@ -0,0 +1,35 @@
+func sierpinski_triangle(n) -> Array {
+  var triangle = ['*']
+  { |i|
+    var sp = (' ' * Math.pow(2, i-1));
+    triangle = (triangle.map {|x| sp + x + sp} +
+                triangle.map {|x| x + ' ' + x})
+  } * n
+  triangle
+}
+
+class Array {
+  method to_png(scale=1, bgcolor='white', fgcolor='black') {
+
+    static gd = require('GD::Simple')
+    var width = self.max_by{.len}.len
+    self.map!{|r| "%-#{width}s" % r}
+
+    var img = gd.new(width * scale, self.len * scale)
+
+    for i in ^self {
+      for j in RangeNum(i*scale, i*scale + scale) {
+        img.moveTo(0, j)
+        for line in (self[i].scan(/(\s+|\S+)/)) {
+          img.fgcolor(line.contains(/\S/) ? fgcolor : bgcolor)
+          img.line(scale * line.len)
+        }
+      }
+    }
+    img.png
+  }
+}
+
+var triangle = sierpinski_triangle(8)
+var raw_png = triangle.to_png(bgcolor:'black', fgcolor:'red')
+File('triangle.png').write(raw_png, :raw)