diff --git a/LibGui/pixel.c b/LibGui/pixel.c
index 1b3d09e..f8cf988 100644
--- a/LibGui/pixel.c
+++ b/LibGui/pixel.c
@@ -2,7 +2,7 @@
 * @Author: klmp200
 * @Date:   2016-12-27 19:59:21
 * @Last Modified by:   klmp200
-* @Last Modified time: 2016-12-28 23:26:39
+* @Last Modified time: 2016-12-28 23:57:29
 */
 
 #include <stdio.h>
@@ -36,3 +36,52 @@ void DisplayMatrixSDL(SCREEN *screen, Matrix m){
 	}
 	SDL_RenderPresent(screen->renderer);
 }
+
+void WaitUntilEnter(SCREEN * screen){
+	int keypress = 0;
+
+	while (!keypress){
+		while(SDL_PollEvent(&screen->event)){
+			switch (screen->event.type){
+				case SDL_QUIT:
+					keypress = 1;
+					break;
+				case SDL_KEYDOWN:
+					switch(screen->event.key.keysym.sym){
+						case SDLK_RETURN:
+							keypress = 1;
+							break;
+					}
+			}
+		}
+	}
+}
+
+int NewWindowFromMatrix(Matrix m){
+	SCREEN screen;
+
+	screen.WIDTH = m.colCount;
+	screen.HEIGHT = m.rowCount;
+
+	if (SDL_Init(SDL_INIT_VIDEO) < 0){
+		return 1;
+	}
+
+	SDL_CreateWindowAndRenderer(screen.WIDTH, screen.HEIGHT,
+			                    SDL_WINDOW_RESIZABLE | SDL_WINDOW_INPUT_FOCUS | SDL_WINDOW_SHOWN,
+			                    &(screen.window), &(screen.renderer));
+
+	if (screen.window == NULL || screen.renderer == NULL){
+		SDL_Quit();
+		return 1;
+	}
+
+	DisplayMatrixSDL(&screen, m);
+
+	WaitUntilEnter(&screen);
+
+	SDL_DestroyRenderer(screen.renderer);
+	SDL_DestroyWindow(screen.window);
+
+	return 0;
+}
diff --git a/LibGui/pixel.h b/LibGui/pixel.h
index dbf255f..c2f8803 100644
--- a/LibGui/pixel.h
+++ b/LibGui/pixel.h
@@ -31,4 +31,18 @@ void SetPixel(SDL_Renderer *renderer, int x, int y, bool value);
 */
 void DisplayMatrixSDL(SCREEN *screen, Matrix m);
 
+/**
+* Wait until the user press the enter key
+* @param screen the screen where the renderer is
+* @return
+*/
+void WaitUntilEnter(SCREEN * screen);
+
+/**
+* Print a matrix in a new SDL window
+* @param Matrix the matrix to display
+* @return int error code
+*/
+int NewWindowFromMatrix(Matrix m);
+
 #endif
diff --git a/matrixmain.c b/matrixmain.c
index bfc169a..8eb5a87 100644
--- a/matrixmain.c
+++ b/matrixmain.c
@@ -17,42 +17,12 @@ int main(){
 	int rules[] = {2, 32, 8, 128};
 	Matrix m2;
 	BooleanMatrix bmatrix = CreateBooleanMatrix(300, 300);
-	int keypress = 0;
-
-	SCREEN screen;
-	screen.WIDTH = 300;
-	screen.HEIGHT = 300;
-
-
-	if (SDL_Init(SDL_INIT_VIDEO) < 0){
-		return 1;
-	}
-
-	SDL_CreateWindowAndRenderer(screen.WIDTH, screen.HEIGHT,
-			                    SDL_WINDOW_RESIZABLE | SDL_WINDOW_MAXIMIZED | SDL_WINDOW_SHOWN,
-			                    &(screen.window), &(screen.renderer));
-	if (screen.window == NULL || screen.renderer == NULL){
-		SDL_Quit();
-		return 1;
-	}
 
 	bmatrix = RandomizeBooleanMatrix(bmatrix);
 	m1 = newMatrix(bmatrix);
 	FreeBooleanMatrix(bmatrix);
 
-	while (!keypress){
-		DisplayMatrixSDL(&screen, m1);
-		while(SDL_PollEvent(&screen.event)){
-			switch (screen.event.type){
-				case SDL_QUIT:
-					keypress = 1;
-					break;
-				case SDL_KEYDOWN:
-					keypress = 1;
-					break;
-			}
-		}
-	}
+	NewWindowFromMatrix(m1);
 
 	m2 = matrixFromRules(m1, 4, rules);
 	freeMatrix(m1);