start moving logic out into a separate renderer

3 files changed, 21 insertions, 12 deletions

diff --git a/examples/mandelbrot.jl b/examples/mandelbrot.jl
index 2a0aa29..9e8f9fe 100644
--- a/examples/mandelbrot.jl
+++ b/examples/mandelbrot.jl
@@ -1,23 +1,14 @@
 using Tk
-using Images
 using ImageView
+using Color
 
 using FractalExplorer
 
 iterations = 45
 imgsize = (640, 480)
 
-img = [ Color.HSV(0, 0, 0) for x=1:imgsize[1], y=1:imgsize[2] ]
-mandelbrot = FractalExplorer.Fractal{Float64}(imgsize)
-
-imgc, imgslice = view(img)
-
-for i = 1:iterations
-  FractalExplorer.step(mandelbrot)
-  new_pixels = (abs(mandelbrot.z) .> 2) & (img .== Color.HSV(0, 0, 0))
-  img[new_pixels] = Color.HSV(i * 360/iterations, 1, 1)
-  view(imgc, img)
-end
+imgc, imgslice = view([ HSV(0, 0, 0) for x=1:imgsize[1], y=1:imgsize[2] ])
+FractalExplorer.render(imgc, iterations)
 
 #If we are not in a REPL
 if (!isinteractive())
diff --git a/src/FractalExplorer.jl b/src/FractalExplorer.jl
index 80142cf..64a52e6 100644
--- a/src/FractalExplorer.jl
+++ b/src/FractalExplorer.jl
@@ -1,3 +1,4 @@
 module FractalExplorer
 include("fractal.jl")
+include("renderer.jl")
 end
diff --git a/src/renderer.jl b/src/renderer.jl
new file mode 100644
index 0000000..2fe3ffd
--- /dev/null
+++ b/src/renderer.jl
@@ -0,0 +1,17 @@
+using Tk
+using Images
+using ImageView
+using Color
+
+function render(imgc, iterations = 45, make_c = z -> z, step = (z, c) -> z.^2 + c)
+    imgsize = get_size(canvas(imgc))
+    img = [ HSV(0, 0, 0) for x=1:imgsize[2], y=1:imgsize[1] ]
+    f = FractalExplorer.Fractal{Float64}((imgsize[2], imgsize[1]), make_c, step)
+
+    for i = 1:iterations
+        FractalExplorer.step(f)
+        new_pixels = (abs(f.z) .> 2) & (img .== HSV(0, 0, 0))
+        img[new_pixels] = HSV(i * 360/iterations, 1, 1)
+        view(imgc, img)
+    end
+end