It works

col.c

@@ -0,0 +1,27 @@
+/*
+** col.c - Collisions
+**
+** 2014 - Frank Villaro-Dixon <Frank@Villaro-Dixon.eu>
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "game.h"
+#include "obs.h"
+
+
+int
+has_collision(struct s_game *g, struct s_obstacle o) {
+	int face = get_face_from_cursor(g);
+
+	if(face != o.face)
+		return 0;
+
+	if(o.distance <= CURSOR_DIST &&
+	   o.distance + o.thick  >= CURSOR_DIST) {
+		return 1;
+	}
+
+	return 0;
+
+}

col.h

@@ -0,0 +1,14 @@
+/*
+** col.h - <+DESC+>
+**
+** 2014 - Frank Villaro-Dixon <Frank@Villaro-Dixon.eu>
+*/
+
+#ifndef COL_H
+#define COL_H
+
+int
+has_collision(struct s_game *g, struct s_obstacle o);
+
+#endif /* ndef COL_H */
+

game.c

@@ -41,10 +41,14 @@ draw_hexagon(struct s_game *g) { //{{{
 
 #define DFT_COLOR 128
 	for(faces = 0; faces < SHAPE_HEXAGON; faces++) {
-		draw_hexagon_side(g, faces, POLYGON_SIZE, SHAPE_THICK, g->color);
+		draw_hexagon_side(g, faces, POLYGON_SIZE, SHAPE_THICK-5, g->color);
 	}
 } //}}}
 
+int
+get_face_from_cursor(struct s_game *g) {
+	return g->cursor_angle * g->polygon_type / ANGLE_MAX;
+}
 
 SDL_Point
 get_circle_vertice(int angle, int dist) { //{{{
@@ -61,9 +65,9 @@ void
 draw_cursor(struct s_game *g) { //{{{
 	SDL_Point p1, p2, p3;
 
-	p1 = get_circle_vertice(g->cursor_angle, CURSOR_DIST+10);
-	p2 = get_circle_vertice(g->cursor_angle-TO_DEG(8), CURSOR_DIST);
-	p3 = get_circle_vertice(g->cursor_angle+TO_DEG(8), CURSOR_DIST);
+	p1 = get_circle_vertice(g->cursor_angle, CURSOR_DIST);
+	p2 = get_circle_vertice(g->cursor_angle-TO_DEG(8), CURSOR_DIST-10);
+	p3 = get_circle_vertice(g->cursor_angle+TO_DEG(8), CURSOR_DIST-10);
 
 	SDL_Point pts[3] = {p1, p2, p3};
 
@@ -99,6 +103,8 @@ get_keys(struct s_game *g) { //{{{
 		g->cursor_angle += TO_DEG(3);
 
 	g->cursor_angle %= ANGLE_MAX;
+	if(g->cursor_angle < 0)
+		g->cursor_angle += ANGLE_MAX;
 } //}}}
 void
 init_game(struct s_game *g) { //{{{

game.h

@@ -19,8 +19,8 @@
 #define SHAPE_PENTAGON 5
 #define SHAPE_HEXAGON 6
 
-#define SHAPE_THICK 5
-#define CURSOR_DIST 40
+#define SHAPE_THICK 15
+#define CURSOR_DIST (POLYGON_SIZE + SHAPE_THICK + 10)
 #define ANGLE_MAX 3600
 
 #define OFFSET_POINT(p) {p.x += SCREEN_WIDTH/2; p.y += SCREEN_HEIGHT/2;}
@@ -56,6 +56,9 @@ struct s_game {
 void
 init_game(struct s_game *g);
 
+int
+get_face_from_cursor(struct s_game *g);
+
 void
 draw_game(struct s_game *g);
 

main.c

@@ -34,8 +34,15 @@ start:
 		draw_game(&ga);
 		SDL_Flip(ga.screen);
 
+		if(check_collisions(&ga)) {
+			puts("PERDU, connard !");
+			SDL_Delay(2000);
+			goto start;
+		}
+
 		get_keys(&ga);
-		SDL_Delay(10);
+
+		SDL_Delay(5);
 
 		ga.counter++;
 	}

obs.c

@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include "game.h"
+#include "col.h"
 #include <math.h>
 
 void
@@ -81,6 +82,18 @@ add_random_obstacle(struct s_game *g) {
 	struct s_obstacle o;
 
 	o = create_obstacle(SHAPE_THICK, rand()%g->polygon_type, 1);
-
 	add_obstacle(g, o);
 }
+
+int
+check_collisions(struct s_game *g) {
+	int i;
+	for(i = 0; i < g->num_obs; i++) {
+		if(g->obs[i].used) {
+			if(has_collision(g, g->obs[i]))
+				return 1;
+		}
+	}
+	return 0;
+}
+

obs.h

@@ -29,6 +29,8 @@ update_obstacles(struct s_game *g);
 void
 add_random_obstacle(struct s_game *g);
 
+int
+check_collisions(struct s_game *g);
 
 #endif /* ndef OBS_H */