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Task/Spiral-matrix/Phix/spiral-matrix.phix

@@ -0,0 +1,19 @@
+integer n = 5
+string fmt = sprintf("%%%dd",length(sprintf("%d",n*n)))
+integer x = 1, y = 0, c = 0, dx = 0, dy = 1, len = n
+sequence m = repeat(repeat("??",n),n)
+for i=1 to 2*n do                               -- 2n runs..
+    for j=1 to len do                           -- of a length...
+        x += dx
+        y += dy
+        m[x][y] = sprintf(fmt,c)
+        c += 1
+    end for
+    len -= and_bits(i,1)                        -- ..-1 every other
+    {dx,dy} = {dy,-dx}                          -- in new direction
+end for
+
+for i=1 to n do
+    m[i] = join(m[i])
+end for
+puts(1,join(m,"\n"))