From 026d33d12150bdf14c4ecd6b4dc359182d434131 Mon Sep 17 00:00:00 2001
From: JNDTUHH <jndiercks@gmail.com>
Date: Sun, 14 Jan 2018 15:09:59 +0100
Subject: Einfache Laufzeitmessung Rekursion/Schleife

---
 Test - Benchmark/Makefile     |   7 +++
 Test - Benchmark/Mandelbrot.c | 120 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 127 insertions(+)
 create mode 100644 Test - Benchmark/Makefile
 create mode 100644 Test - Benchmark/Mandelbrot.c

diff --git a/Test - Benchmark/Makefile b/Test - Benchmark/Makefile
new file mode 100644
index 0000000..c8dd5d1
--- /dev/null
+++ b/Test - Benchmark/Makefile	
@@ -0,0 +1,7 @@
+
+all:
+# compile
+	gcc -std=c99 -pedantic -Wall -Wextra -o Mandelbrot.exe Mandelbrot.c 
+
+# run
+	Mandelbrot.exe
diff --git a/Test - Benchmark/Mandelbrot.c b/Test - Benchmark/Mandelbrot.c
new file mode 100644
index 0000000..eecb7cb
--- /dev/null
+++ b/Test - Benchmark/Mandelbrot.c	
@@ -0,0 +1,120 @@
+#include <stdio.h>
+#include <math.h>
+#include <time.h>
+#include <sys/time.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+#define x_MIN -2.0
+#define x_MAX  1.0
+#define y_MIN -1.0
+#define y_MAX  1.0
+
+#define BMP_HEIGHT 800
+#define BMP_WIDTH 1000
+
+#define N_MAX 250
+
+void toMath(int X, int Y, double* x, double* y) {
+  if ((X < 0) || (X > BMP_WIDTH) || (Y < 0) || (Y > BMP_HEIGHT)) {
+    printf("Fehler: 0 <= %d <= %d\n", X, BMP_WIDTH);
+    printf("   oder 0 <= %d <= %d verletzt!\n", Y, BMP_HEIGHT);
+    *x = x_MIN;
+    *y = y_MIN;
+    return;
+  }
+  *x = x_MIN + ((double) X * (x_MAX - x_MIN)) / BMP_WIDTH;
+  *y = y_MIN + ((double) (BMP_HEIGHT - Y) * (y_MAX - y_MIN)) / BMP_HEIGHT;
+}
+
+int mandelbrot(double x, double y, double zx, double zy, int n, int n_max,
+               double threshold) {
+  if ((n <= n_max) && ((zx * zx + zy * zy) < threshold)) {
+    double zx_new = (zx * zx - zy * zy + x);
+    double zy_new = (2 * zx * zy + y);
+    if ((zx_new == zx) && (zy_new == zy)) {
+      return n_max;
+    }
+    n = mandelbrot(x, y, zx_new, zy_new, n + 1, n_max, threshold);
+  }
+  return n;
+}
+
+
+int main(){
+	
+	float z;
+	clock_t begin, begin2, end, end2;
+	uint32_t X = 0, Y = 0;
+	
+	begin = clock();
+	uint32_t* data = (uint32_t*) malloc(BMP_WIDTH * BMP_HEIGHT * sizeof(uint32_t));
+	int n = 0;
+	double x = 0.0, y = 0.0;
+	int n_max = 500;      
+	double threshold = 4.0; 
+
+	for (int Y = 0; Y < BMP_HEIGHT; Y++) {
+		for (int X = 0; X < BMP_WIDTH; X++) {
+		  double x, y;
+		  toMath(X, Y, &x, &y);
+		  int n = mandelbrot(x, y, 0.0, 0.0, 0, n_max, threshold);
+		  data[Y * BMP_WIDTH + X] = n;
+		}
+	}
+	end = clock();
+	printf("Rekursion Ende");
+	getchar();
+	
+	// for(int i = 0; i < BMP_HEIGHT*BMP_WIDTH; i++){
+		// printf("%d\n",data[i]);
+	// }
+
+	begin2 = clock();
+	uint32_t* data2 = (uint32_t*) malloc(BMP_WIDTH * BMP_HEIGHT * sizeof(uint32_t));
+	int m = 0;
+
+	for (int Y = 0; Y < BMP_HEIGHT; Y++) {
+		for (int X = 0; X < BMP_WIDTH; X++) {
+			double x, y, x2;
+			toMath(X, Y, &x, &y);
+			double cx = x;
+			double cy = y;
+			while(m <=n_max && (x*x)+(y*y) <= 4){
+				x2 = x;
+				x = (x*x) - (y*y) + cx;
+				y = 2.0*x2*y + cy;
+				m++;
+			}
+			data2[Y * BMP_WIDTH + X] = n;
+		}
+	}
+	end2 = clock();
+	
+	// for(int i = 0; i < BMP_HEIGHT*BMP_WIDTH; i++){
+		// printf("%d\n",data2[i]);
+	// }
+
+	
+	printf("Rekursion:\n");
+	printf("begin:                         %d\n", begin);
+	printf("end:                           %d\n", end);
+	printf("clocks zwischen begin und end: %d\n", end - begin);
+	z=end - begin;
+	z/=CLOCKS_PER_SEC;
+	printf("Zeit zwischen begin und end:   %f Sekunden\n", z);
+	printf("CLOCKS_PER_SEC:                %d\n", CLOCKS_PER_SEC);
+	
+	printf("Schleifen:\n");
+	printf("begin:                         %d\n", begin2);
+	printf("end:                           %d\n", end2);
+	printf("clocks zwischen begin und end: %d\n", end2 - begin2);
+	z=end2 - begin2;
+	z/=CLOCKS_PER_SEC;
+	printf("Zeit zwischen begin und end:   %f Sekunden\n", z);
+	printf("CLOCKS_PER_SEC:                %d\n", CLOCKS_PER_SEC);
+
+
+
+}
\ No newline at end of file
-- 
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