Constrained random points on a circle: Difference between revisions

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@@ Line 1,634: / Line 1,634: @@
 =={{header|Julia}}==
+{{works with|Julia|0.6}}
 This solution uses the "pick random x, y and cull" rather than the "calculate valid and choose randomly" approach.
+<lang julia>function printcircle(lo::Integer, hi::Integer, ndots::Integer; pad::Integer = 2)
-<lang Julia>
+    canvas = falses(2hi + 1, 2hi + 1)
-const LO = 10
-const HI = 15
+    i = 0
+    while i < ndots
-const GOAL = 100
+        x, y = rand(-hi:hi, 2)
+        if lo ^ 2 - 1 < x ^ 2 + y ^ 2 < hi ^ 2 + 1
-canvas = falses(2HI+1, 2HI+1)
+            canvas[x + hi + 1, y + hi + 1] = true
-i = 0
+            i += 1
+        end
-while i < GOAL
+    end
-    x = rand(-HI:HI)
-    y = rand(-HI:HI)
+    # print
-    LO^2-1 < x^2 + y^2 < HI^2+1 || continue
+    for i in 1:(2hi + 1)
+        row = map(j -> j ? "\u25cf " : "  ", canvas[i, :])
-    i += 1
+        println(" " ^ pad, join(row))
-    canvas[x+HI+1, y+HI+1] = true
+    end
+    return canvas
 end
+printcircle(10, 15, 100)</lang>
-for i in 1:(2HI+1)
-    println("    ", join(map(j -> j ? "\u25cf " : "  ", canvas[i,:])))
-end
-</lang>
 {{out}}