September 2017 Update

Task/Draw-a-sphere/Julia/draw-a-sphere.julia

@@ -0,0 +1,29 @@
+# v0.6
+
+function draw_sphere(r, k, ambient, light)
+    shades = ('.', ':', '!', '*', 'o', 'e', '&', '#', '%', '@')
+    for i in floor(Int, -r):ceil(Int, r)
+        x = i + 0.5
+        line = IOBuffer()
+        for j in floor(Int, -2r):ceil(2r)
+            y = j / 2 + 0.5
+            if x ^ 2 + y ^ 2 ≤ r ^ 2
+                v = normalize([x, y, sqrt(r ^ 2 - x ^ 2 - y ^ 2)])
+                b = dot(light, v) ^ k + ambient
+                intensity = ceil(Int, (1 - b) * (length(shades) - 1))
+                if intensity < 1
+                    intensity = 1 end
+                if intensity > length(shades)
+                    intensity = length(shades) end
+                print(shades[intensity])
+            else
+                print(' ')
+            end
+        end
+        println()
+    end
+end
+
+light = normalize([30, 30, -50])
+draw_sphere(20, 4, 0.1, light)
+draw_sphere(10, 2, 0.4, light)