Data commit

Task/Greyscale-bars-Display/PicoLisp/greyscale-bars-display.l

@@ -0,0 +1,16 @@
+(let Pgm  # Create PGM of 384 x 288 pixels
+   (make
+      (for N 4
+         (let L
+            (make
+               (for I (* N 8)
+                  (let C (*/ (dec I) 255 (dec (* N 8)))
+                     (unless (bit? 1 N)
+                        (setq C (- 255 C)) )
+                     (do (/ 48 N) (link C)) ) ) )
+            (do 72 (link L)) ) ) )
+   (out '(display)  # Pipe to ImageMagick
+      (prinl "P5")  # NetPBM format
+      (prinl (length (car Pgm)) " " (length Pgm))
+      (prinl 255)
+      (for Y Pgm (apply wr Y)) ) )