bugfix, extra check, colors and blur

Canvas.hpp

@@ -21,6 +21,7 @@
 #include <vector>
 #include <iterator>
 #include <array>
+#include <numeric>
 
 template <typename T>
 class Canvas2D {
@@ -30,6 +31,7 @@ class Canvas2D {
 
 public:
 	static constexpr size_t dimension = 2;
+	static constexpr bool layered = false;
 	
 	Canvas2D(size_t width, size_t height)
 	: storage(height, Row(width, 0))
@@ -47,13 +49,12 @@ public:
 		const size_t width = size<0>();
 		const size_t height = size<1>();
 		
-		const size_t c = 0.5*position[0]*width + width*.5;
+		const int c = 0.5*position[0]*width + width*.5;
-		const size_t r = 0.5*position[1]*width + height*.5;
+		const int r = 0.5*position[1]*width + height*.5;
 		
-		if(c < width && r < height) {
+		if(0 <= c && c < width && 0 <= r && r < height)
 			storage[r][c]++;
 	}
-	}
 	
 	size_t size() const {
 		return size<0>() * size<1>();
@@ -213,6 +214,7 @@ template <typename Canvas>
 class LayeredCanvas {
 public:
 	static constexpr size_t dimension = Canvas::dimension;
+	static constexpr bool layered = true;
 	
 	LayeredCanvas(size_t width, size_t height, size_t layers)
 	: canvae(layers, Canvas(width, height))
@@ -230,6 +232,10 @@ public:
 		return canvae.size();
 	}
 	
+	size_t size() const {
+		return canvae.front().size();
+	}
+	
 	template <size_t N>
 	size_t size() const {
 		return canvae.front().size<N>();
@@ -243,4 +249,26 @@ private:
 	std::vector<Canvas> canvae;
 };
 
+template <typename C>
+typename std::enable_if<!C::layered, bool>::type filled(C const & canvas, double threshold) {
+	struct functor {
+		size_t operator()(size_t x, size_t y){
+			if(y > 0) return ++x;
+			else return x;
+		}
+	} f;
+	size_t nonempty_pixels = std::accumulate(canvas.begin(), canvas.end(), 0ul, f);
+	return nonempty_pixels > threshold * canvas.size();
+}
+
+template <typename C>
+typename std::enable_if<C::layered, bool>::type filled(C const & canvas, double threshold) {
+	for (unsigned int l = 0; l < canvas.layers(); ++l) {
+		if (!filled(canvas[l], threshold)) {
+			return false;
+		}
+	}
+	return true;
+}
+
 #endif

Tonemapper.hpp

@@ -79,21 +79,21 @@ namespace Tonemappers {
 		: gamma_correctors(n_planes)
 		, gammas()
 		{
-			gammas[0].push_back(1.0);
+			gammas[0].push_back(1.3);
-			gammas[1].push_back(3.0);
+			gammas[1].push_back(2.0);
 			gammas[2].push_back(3.0);
 			
 			gammas[0].push_back(3.0);
 			gammas[1].push_back(1.0);
 			gammas[2].push_back(1.0);
 			
-			colors[0].push_back(3.0);
+			colors[0].push_back(1.5);
-			colors[1].push_back(0.0);
-			colors[2].push_back(0.0);
-			
-			colors[0].push_back(0.0);
 			colors[1].push_back(2.0);
-			colors[2].push_back(3.0);
+			colors[2].push_back(1.0);
+			
+			colors[0].push_back(-1.0);
+			colors[1].push_back(-0.5);
+			colors[2].push_back(0.7);
 		}
 		
 		template <typename C>
@@ -120,9 +120,12 @@ namespace Tonemappers {
 		double get_value(T const & n, size_t color) const {
 			double ret = 0.0;
 			for (size_t i = 0; i < n.size(); ++i){
-				ret += gamma_correctors[color].get_value(n[i], gammas[color][i]) * colors[color][i];
+				ret += gamma_correctors[i].get_value(n[i], gammas[color][i]) * colors[color][i];
 			}
+			if(std::isnormal(ret))
 				return ret;
+			else
+				return 0.0;
 		}
 		std::vector<GammaCorrector> gamma_correctors;
 		std::array<std::vector<double>, 3> gammas;

batch.sh

@@ -1,2 +1,2 @@
 #!/bin/bash
-while true; do ./build/Debug/AwesomeAttract0r -P ./render/ -I 20 -W 1280 -H 800 -f attractors/emptyUnravel3D.stf; done
+while true; do ./build/Release\ with\ Symbols/AwesomeAttract0r -P ./render/ -I 50 -W 1280 -H 800 -f attractors/emptyUnravel3D.stf; done

main.cpp

@@ -38,10 +38,14 @@ void render(Attractor & myAttractor, C & canvas, unsigned int iterations){
 			canvas.plot(myAttractor.projector->projectedPoint, 0);
 			double x = rand() / (double) RAND_MAX - 0.5;
 			double y = rand() / (double) RAND_MAX - 0.5;
-			double blur[2] = {myAttractor.projector->projectedPoint[0] + x*0.02, myAttractor.projector->projectedPoint[1] + y*0.02};
+			x *= x*x;
+			y *= y*y;
+			double blur[2] = {myAttractor.projector->projectedPoint[0] + x*0.3, myAttractor.projector->projectedPoint[1] + y*0.3};
 			canvas.plot(blur, 1);
 		}
 		progress.show(j, iterations);
+		if(j == iterations/3) if(!filled(canvas, 0.01)) return;
+		if(j == iterations/3 * 2) if(!filled(canvas, 0.02)) return;
 	}
 }
 
@@ -82,6 +86,11 @@ int main(int argc, char* argv[]) try {
 		render(my_attractor, canvas, iterations);
 		logger.stop();
 		
+		if(!filled(canvas, 0.05)){
+			logger.log("The canvas is too empty. Stopping.");
+			return 0;
+		}
+		
 		std::string path(filename + ".stf");
 		std::ofstream file(path.c_str());
 		file << my_attractor.stf_output() << std::endl;