added remaining collisions

levels/test.txt

@@ -1,6 +1,6 @@
 5 5
-..S..
+..S14
-..214
+....0
 ...35
 .E15.
 .....

output.txt

@@ -0,0 +1,13 @@
+4
+0 (2 0) (38.73 87.83)
+1 (3 0) (12.86 46.67)
+2 (2 0) (96.96 38.71)
+3 (4 0) (55.58 91.72)
+[2]
+
+5 5
+..S14
+....0
+...35
+.E15.
+.....

src/base.c

@@ -85,3 +85,11 @@ ptf normalize(ptf p) {
     double nr = norm(p);
     return (ptf){.fx = p.fx/nr, .fy = p.fy/nr};
 }
+
+double dot(ptf p1, ptf p2) {
+    return p1.fx*p2.fx + p1.fy*p2.fy;
+}
+
+ptf add(ptf p1, ptf p2) {
+    return (ptf){.fx = p1.fx + p2.fx, .fy = p1.fy + p2.fy};
+}

src/base.h

@@ -14,5 +14,7 @@ double distance_pt(int x1, int x2, int y1, int y2);
 double norm(ptf p);
 double distance(ptf p1, ptf p2);
 ptf normalize(ptf p);
+double dot(ptf p1, ptf p2);
+ptf add(ptf p1, ptf p2);
 
 #endif

src/cars.c

@@ -21,8 +21,8 @@ ptf get_position(int nPl, int nTotPl) {
     double theta = (2.0*MAX_THETA_SPAWN*nPl/((nTotPl-1==0)?(1):(nTotPl-1)) - 1.0*MAX_THETA_SPAWN);
     //printf("%d --> %lf", nPl, theta);
     return (ptf){
-        .fx = ROOM_SIZE/2.0+cos(theta*PI/180.0 - PI/2.0*(START_DIR-1))*ROOM_SIZE/3.3,
+        .fx = ROOM_SIZE/2.0+cos(theta*PI/180.0 +PI/2.0*(START_DIR+1))*ROOM_SIZE/3.3,
-        .fy = ROOM_SIZE/2.0+sin(theta*PI/180.0 - PI/2.0*(START_DIR-1))*ROOM_SIZE/3.3
+        .fy = ROOM_SIZE/2.0+sin(theta*PI/180.0 +PI/2.0*(START_DIR+1))*ROOM_SIZE/3.3
     };
 }
 
@@ -36,7 +36,7 @@ car* init_car(int nPl, int nTotPl) {
     res->chy = START_CHX;
     //res->vel = (ptf){.fx = 0.0, .fy = 0.0};
     double theta = (2.0*MAX_THETA_SPAWN*nPl/((nTotPl-1==0)?(1):(nTotPl-1)) - 1.0*MAX_THETA_SPAWN);
-    res->vel = (ptf){.fx = (rand()%100-50.0)/100.0*2.0*MAX_SPEED, .fy = (rand()%100-50.0)/100.0*2.0*MAX_SPEED};
+    res->vel = (ptf){.fx = (rand()%100)/100.0*2.0*MAX_SPEED, .fy = (rand()%100-50.0)/100.0*2.0*MAX_SPEED};
     return res;
 }
 

src/collisions.c

@@ -118,6 +118,43 @@ void move_on_STR_H(int nPl) {
     }
 }
 
+void move_on_TURN(int nPl, int cenX, int cenY) {
+    car* c = players[nPl].c;
+    ptf prev = (ptf){.fx = c->pos.fx, .fy = c->pos.fy};
+    c->pos.fx += c->vel.fx*DT;
+    c->pos.fy += c->vel.fy*DT;
+    ptf next = c->pos;
+
+    double prevDist = distance(prev, (ptf){.fx = 1.0*cenX, .fy = 1.0*cenY});
+    double nextDist = distance(next, (ptf){.fx = 1.0*cenX, .fy = 1.0*cenY});
+
+    // inner circle
+    if(prevDist-PLAYER_R/2 > ROOM_SIZE*DIST_EDGE && nextDist-PLAYER_R/2 <= ROOM_SIZE*DIST_EDGE) {
+        ptf to_in = normalize((ptf){
+            .fx = cenX-prev.fx,
+            .fy = cenY-prev.fy
+        });
+        double inwards = dot(to_in, c->vel);
+        c->vel = add(c->vel, (ptf){.fx = -2.0*to_in.fx*inwards, .fy = -2.0*to_in.fy*inwards});
+
+        c->pos.fx += 2.0*c->vel.fx*DT;
+        c->pos.fy += 2.0*c->vel.fy*DT;
+    }
+
+    // outer circle
+    if(prevDist+PLAYER_R/2 < ROOM_SIZE*(1.0-DIST_EDGE) && nextDist+PLAYER_R/2 >= ROOM_SIZE*(1.0-DIST_EDGE)) {
+        ptf to_out = normalize((ptf){
+            .fx = prev.fx-cenX,
+            .fy = prev.fy-cenY
+        });
+        double outwards = dot(to_out, c->vel);
+        c->vel = add(c->vel, (ptf){.fx = -2.0*to_out.fx*outwards, .fy = -2.0*to_out.fy*outwards});
+
+        c->pos.fx += 2.0*c->vel.fx*DT;
+        c->pos.fy += 2.0*c->vel.fy*DT;
+    }
+}
+
 void bumpOtherCars(int nPl) {
     for(int p = 0; p < nPlayers; p++) {
         if(p != nPl) {
@@ -182,28 +219,28 @@ bool updateCar(level* lvl, int nPl) {
                 return true;
 
             case TURN_NE:
-            
+                move_on_TURN(nPl, ROOM_SIZE, 0);
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(nPl);
                 return true;
 
             case TURN_NW:
-            
+                move_on_TURN(nPl, 0, 0);
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(nPl);
                 return true;
 
             case TURN_SE:
-            
+                move_on_TURN(nPl, ROOM_SIZE, ROOM_SIZE);
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(nPl);
                 return true;
 
             case TURN_SW:
-            
+                move_on_TURN(nPl, 0, ROOM_SIZE);
                 bumpOtherCars(nPl);
                 apply_friction(nPl);
                 updateChunk(nPl);

src/display.c

@@ -503,16 +503,16 @@ void renderCircles(SDL_Renderer* renderer, level* lvl, int cx, int cy, int range
 
 void renderPlayers(SDL_Renderer* renderer, int cx, int cy, int range, int rsize) {
     for(int p = 0; p < nPlayers; p++) {
-        if(players[p].c->chx >= cx-range && players[p].c->chx <= cx+range && players[p].c->chy >= cy-range && players[p].c->chy <= cy+range) {
+        if(players[p].c->chx >= cy-range && players[p].c->chx <= cy+range && players[p].c->chy >= cx-range && players[p].c->chy <= cx+range) {
+            //printf("[%d]", p);
             int cox = (WIDTH-rsize)/2+rsize*(players[p].c->chx-cy) + (int)((players[p].c->pos.fx*1.0)/ROOM_SIZE*rsize);
             int coy = (HEIGHT-rsize)/2+rsize*(players[p].c->chy-cx) + (int)((players[p].c->pos.fy*1.0)/ROOM_SIZE*rsize);
-            //printf("Abs : (%d %d)\n", players[p].c->chx, players[p].c->chy);
-            //printf("Relative : (%d : %d)\n", players[p].c->chx-cy, players[p].c->chy-cx);
             SDL_RenderFillCircle(renderer, cox, coy, PLAYER_R, players[p].rgb.red, players[p].rgb.green, players[p].rgb.blue, 255);
         } else {
             //
         }
     }
+    //printf("\n");
 }
 
 void renderMap(SDL_Renderer* renderer, level* lvl, int cx, int cy, int range, int rsize) {

src/main.c

@@ -77,7 +77,7 @@ int main() {
 
     while(!halt) {
         resetRenderer(rend);
-        renderMap(rend, test, 1, 2, 2, 250);
+        renderMap(rend, test, 1, 2, 2, 200);
         if(elapsed <= 0.7) {
             placeRectToRenderer(rend, 0, 0, 50, 50, 255, 255, 32, 192);
         } else if(updateCars(test)) {
@@ -87,14 +87,12 @@ int main() {
         }
         updateRenderer(rend);
         elapsed += DT;
-        //for(int p = 0; p < N_PLAYERS; p++) {
-        //    printf("[%d], (at [%d %d] (%lf %lf) (%lf %lf))\n", p, players[p].c->chx, players[p].c->chy, players[p].c->pos.fx, players[p].c->pos.fy, players[p].c->vel.fx, players[p].c->vel.fy);
-        //}
-        //printf("\n");
         usleep((int)(1000000*DT));
         playerActions();
     }
 
+    write_output("output.txt", test, 2);
+    
     // ---------------------------- //
     free_digits(digits);
     free_digits(letters);

src/structure.c

@@ -24,3 +24,41 @@ const double FRICTION = 0.75;
 const double DV = 1.5;                  // m/s
 const double DT = 1.0/100.0;
 const double EPSILON = 1.0/4096.0;
+
+const double DELTA_V = 0.98;            // m/s
+const double DELTA_THETA = 5;           // degrees
+
+// ------------------------------------------------------------------------------------------ //
+
+void write_output(char* stream, level* lvl, int nPl) {
+    FILE* ptr = fopen(stream, "w");
+    fprintf(ptr, "%d\n",nPlayers);
+    for(int p = 0; p < nPlayers; p++) {
+        fprintf(ptr, "%d (%d %d) (%.2lf %.2lf)\n", p, players[p].c->chx, players[p].c->chy, players[p].c->pos.fx, players[p].c->pos.fy);
+    }
+    fprintf(ptr, "[%d]\n\n", nPl);
+    fprintf(ptr, "%d %d\n", lvl->lines, lvl->cols);
+    for(int l = 0; l < lvl->lines; l++) {
+        for(int c = 0; c < lvl->cols; c++) {
+            switch (lvl->map[l][c]){
+                case NONE:
+                    fprintf(ptr, ".");
+                    break;
+
+                case START:
+                    fprintf(ptr, "S");
+                    break;
+
+                case END:
+                    fprintf(ptr, "E");
+                    break;
+                
+                default:
+                    fprintf(ptr, "%d", (int)lvl->map[l][c]-3);
+                    break;
+            }
+        }
+        fprintf(ptr, "\n");
+    }
+    fclose(ptr);
+}

src/structure.h

@@ -94,4 +94,11 @@ extern const double DV;
 extern const double DT;
 extern const double EPSILON;
 
+extern const double DELTA_V;
+extern const double DELTA_THETA;
+
+// -------------------------------------------------------------------------------- //
+
+void write_output(char* stream, level* lvl, int nPl);
+
 #endif