diff --git a/src/graphics/graphics.c b/src/graphics/graphics.c
index ece38a2..8a354bd 100644
--- a/src/graphics/graphics.c
+++ b/src/graphics/graphics.c
@@ -30,8 +30,8 @@
 #include "../../include/grid.h"
 #include "../../include/shaders_study.h"
 
-#define VERTEX_SHADER_FILE "src/shaders/shader.vert"
-#define FRAG_SHADER_FILE "src/shaders/shader.frag"
+//  #define VERTEX_SHADER_FILE "src/shaders/shader.vert"
+//  #define FRAG_SHADER_FILE "src/shaders/shader.frag"
 
 static GLfloat *buffer_vertex_origin = NULL;
 static GLfloat *buffer_colors_origin = NULL;
@@ -238,116 +238,14 @@ void graphics_init_buffers(const void *gl_area)
     }
 }
 
-/*
- * Initializes the shaders of a gl_area and link them to a program
- *
- * @param   gl_area, ptr to the gl_area widget
- *
- * @return  true if initialized
- */
-/* bool graphics_init_shaders(const void *gl_area) */
-/* { */
-/*     char *vertex_shader; */
-/*     char *fragment_shader; */
-/*     struct gl_area_entry *entry; */
-/*     int status; */
-/*     GLuint vertex, fragment; */
-/*     GLuint program = 0; */
-/*     GLuint m = 0; */
-/*     GLuint v = 0; */
-/*     GLuint p = 0; */
 
-/*     entry = graphics_find_glarea_from_ptr(gl_area); */
 
-/*     if (entry == NULL) { */
-/*         errno = EFAULT; */
-/*         perror("gl_area_array entry not found"); */
-/*         return false; */
-/*     } */
 
-/*     // Load vertex shader file */
-/*     vertex_shader = read_file(VERTEX_SHADER_FILE); */
-/*     if (vertex_shader == NULL) */
-/*         return false; */
-/*     vertex = create_shader(GL_VERTEX_SHADER, vertex_shader); */
+/* 28-9-2023  Je déplace la fonction : "bool graphics_init_shaders(const void *gl_area)"
+ *            dans un nouveau fichier "shaders_study.c" pour alléger graphics.c */
 
-/* //  !  WARNING  !  l'instruction suivante (ou un autre 'free') a pu provoquer un 'double free' (Abandon) */
-/*     if(vertex == 0) { */
-/*         entry->program = 0; */
-/*         g_free(vertex_shader); */
-/*         return false; */
-/*     } */
 
-/*     // Load fragment shader file */
-/*     fragment_shader = read_file(FRAG_SHADER_FILE); */
-/*     if (fragment_shader == NULL) */
-/*         return false; */
-/*     fragment = create_shader(GL_FRAGMENT_SHADER, fragment_shader); */
 
-/*     if(fragment == 0) { */
-/*         glDeleteShader(vertex); */
-/*         entry->program = 0; */
-/*         g_free(vertex_shader); */
-/*         g_free(fragment_shader); */
-/*         return false; */
-/*     } */
-
-/*     // Link shaders to program */
-/*     program = glCreateProgram(); */
-/*     glAttachShader(program, vertex); */
-/*     glAttachShader(program, fragment); */
-
-/*     glLinkProgram(program); */
-
-/*     glGetProgramiv(program, GL_LINK_STATUS, &status); */
-
-/*     if(status == GL_FALSE) { */
-/*         int log_len; */
-/*         char *buffer; */
-
-/*         glGetProgramiv(program, GL_INFO_LOG_LENGTH, &log_len); */
-
-/*         buffer = g_malloc(log_len + 1); */
-/*         assert(buffer); */
-/*         glGetProgramInfoLog(program, log_len, NULL, buffer); */
-
-/*         g_warning("Linking failure:\n%s", buffer); */
-
-/*         g_free(buffer); */
-
-/*         glDeleteProgram(program); */
-/*         program = 0; */
-
-/*         glDeleteShader(vertex); */
-/*         glDeleteShader(fragment); */
-
-/*         g_free(vertex_shader); */
-/*         g_free(fragment_shader); */
-
-/*         return false; */
-/*     } */
-
-    /* Get the location of the "mvp" uniform */
-/*     m = glGetUniformLocation(program, "model_matrix"); */
-/*     v = glGetUniformLocation(program, "view_matrix"); */
-/*     p = glGetUniformLocation(program, "projection_matrix"); */
-
-/*     glDetachShader(program, vertex); */
-/*     glDetachShader(program, fragment); */
-
-/*     glDeleteShader(vertex); */
-/*     glDeleteShader(fragment); */
-
-/*     entry->program = program; */
-/*     entry->m = m; */
-/*     entry->v = v; */
-/*     entry->p = p; */
-
-/*     g_free(vertex_shader); */
-/*     g_free(fragment_shader); */
-
-/*     return true; */
-/* } */
 
 /*
  * Draws the current buffer to a gl_area
diff --git a/src/graphics/shaders_study.c b/src/graphics/shaders_study.c
index 0508042..c86d60d 100644
--- a/src/graphics/shaders_study.c
+++ b/src/graphics/shaders_study.c
@@ -31,6 +31,12 @@
 #define VERTEX_SHADER_FILE "src/shaders/shader.vert"
 #define FRAG_SHADER_FILE "src/shaders/shader.frag"
 
+//  Que fait l'instruction suivante (ligne 397 de graphics.c)
+//     dans  "bool graphics_init(const char *gl_area)" ?
+//
+//    if (!graphics_init_shaders(gl_area)) return false;
+
+
 static volatile int buffer_vertex_size = 0;
 static volatile int buffer_lines_size = 0;
 static volatile int buffer_colors_size = 0;