QAM add constellation plot

plot/plot_constellation.h

@@ -0,0 +1,35 @@
+#ifndef PLOT_CONSTELLATION_H
+#define PLOT_CONSTELLATION_H
+
+#include <complex.h>
+#include <SDL2/SDL.h>
+
+typedef struct {
+    SDL_Window *window;
+    SDL_Renderer *renderer;
+    int width;
+    int height;
+    double scale;
+    double offset_x;
+    double offset_y;
+} plot_t;
+
+// Initialiser SDL et la fenêtre
+void plot_init(plot_t *plot, int width, int height, double scale);
+
+// Dessiner la constellation (grille de départ)
+void plot_draw_constellation(plot_t *plot, double complex **constellation, int M);
+
+// Dessiner un tableau de points complexes
+void plot_draw_points(plot_t *plot, double complex *points, int nb_points, SDL_Color color);
+
+// Dessiner les points progressivement avec animation
+// delay_ms = délai entre chaque point en millisecondes
+// Keypress pendant animation coupe l’animation
+void plot_draw_points_animated(plot_t *plot, double complex *points, int nb_points, SDL_Color color, int delay_ms);
+
+// Fermer SDL proprement
+void plot_close(plot_t *plot);
+
+#endif
+