From e4a1e61a88a89930971aa59928481e19d02176dc Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Mon, 27 Oct 2014 12:35:32 -0400
Subject: automatically calculate the required number of iterations

---
 examples/mandelbrot.jl |  3 +--
 src/renderer.jl        | 19 ++++++++++++-------
 2 files changed, 13 insertions(+), 9 deletions(-)

diff --git a/examples/mandelbrot.jl b/examples/mandelbrot.jl
index 57637ef..1eb25b0 100644
--- a/examples/mandelbrot.jl
+++ b/examples/mandelbrot.jl
@@ -4,7 +4,6 @@ using Color
 
 using FractalExplorer
 
-iterations = 45
 imgsize = (640, 480)
 
 win = Toplevel("FractalExplorer", imgsize[1], imgsize[2], false)
@@ -15,4 +14,4 @@ pack(canvas, expand=true, fill="both")
 set_visible(win, true)
 view(canvas, [ 0.0 for y=1:imgsize[2], x=1:imgsize[1] ], interactive=false)
 
-mandelbrot(canvas, iterations)
+mandelbrot(canvas)
diff --git a/src/renderer.jl b/src/renderer.jl
index 1eb04b2..45261e4 100644
--- a/src/renderer.jl
+++ b/src/renderer.jl
@@ -3,18 +3,23 @@ using Images
 using ImageView
 using Color
 
-function fractal(canvas, iterations, make_c, step)
+function fractal(canvas, make_c, step)
     imgsize = get_size(canvas)
     img = [ HSV(0, 0, 0) for y=1:imgsize[1], x=1:imgsize[2] ]
     view(canvas, img, interactive=false)
 
     f = FractalExplorer.Fractal{Float64}(imgsize, make_c, step)
 
-    for i = 1:iterations
+    i = 0
+    while true
         FractalExplorer.step(f)
         new_pixels = (abs(f.z) .> 2) & (img .== HSV(0, 0, 0))
-        img[new_pixels] = HSV(i * 360/iterations, 1, 1)
+        img[new_pixels] = HSV(i * 4, 1, 1)
+        i = i + 1
         view(canvas, img, interactive=false)
+        if length(find(new_pixels)) <= 1
+            break
+        end
     end
 
     if (!isinteractive())
@@ -25,10 +30,10 @@ function fractal(canvas, iterations, make_c, step)
     end
 end
 
-function mandelbrot(canvas, iterations = 45)
-    fractal(canvas, iterations, z -> z, (z, c) -> z.^2 + c)
+function mandelbrot(canvas)
+    fractal(canvas, z -> z, (z, c) -> z.^2 + c)
 end
 
-function julia(canvas, iterations = 45, c = 0)
-    fractal(canvas, iterations, z -> c, (z, c) -> z.^2 + c)
+function julia(canvas, c = 0)
+    fractal(canvas, z -> c, (z, c) -> z.^2 + c)
 end
-- 
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