added incomplete bullet code

Author: anna-singleton

src/bullet.c

@@ -0,0 +1,79 @@
+#include "bullet.h"
+#include "vector.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <SDL2/SDL.h>
+
+#define MAX_BULLETS 50
+#define BULLET_SPEED 10
+#define TRAIL_LENGTH 20
+
+bullet_t* bullets[MAX_BULLETS];
+
+void bullet_init(vec2f* pos, float angle)
+{
+    bullet_t* b = NULL;
+    for(int i=0; i < MAX_BULLETS; i++)
+    {
+        if(bullets[i] == NULL)
+        {
+            bullets[i] = malloc(sizeof(bullet_t));
+            b = bullets[i];
+            break;
+        }
+    }
+    if(b == NULL)
+    {
+        fprintf(stderr, "too many bullets added to static list (anna is lazy)\n");
+        return;
+    }
+    memcpy(&b->position, pos, sizeof(vec2f));
+    memcpy(&b->initial_position, pos, sizeof(vec2f));
+
+    printf("bullet added at %.2f %.2f\n", b->initial_position.x, b->initial_position.y);
+
+    vec2fNormalisedVectorFromAngleDegrees(&b->velocity, angle);
+    vec2fScalarProduct(&b->velocity, &b->velocity, BULLET_SPEED);
+}
+
+void bullet_update(void)
+{
+    for (int i=0; i < MAX_BULLETS; i++)
+    {
+        if (bullets[i] != NULL)
+        {
+            vec2fAdd(&bullets[i]->position, &bullets[i]->position, &bullets[i]->velocity);
+        }
+    }
+}
+
+void bullet_draw(SDL_Renderer* r)
+{
+    for(int i=0; i < MAX_BULLETS; i++)
+    {
+        if(bullets[i] != NULL)
+        {
+            vec2f head;
+            vec2f tail;
+            head.x = bullets[i]->position.x;
+            head.y = bullets[i]->position.y;
+            tail.x = bullets[i]->initial_position.x;
+            tail.y = bullets[i]->initial_position.y;
+
+            if(vec2fDist(&head, &tail) < TRAIL_LENGTH)
+            {
+                SDL_RenderDrawLine(r, head.x, head.y, tail.x, tail.y);
+                printf("1: %.2f %.2f %.2f %.2f\n", head.x, head.y, tail.x, tail.y);
+            }
+            else
+            {
+                vec2f newtail;
+                vec2fDiff(&newtail, &head, &tail);
+                vec2fClampMagnitude(&newtail, &newtail, TRAIL_LENGTH);
+                SDL_RenderDrawLine(r, head.x, head.y, newtail.x, newtail.y);
+                printf("1: %.2f %.2f %.2f %.2f\n", head.x, head.y, newtail.x, newtail.y);
+            }
+        }
+    }
+}

src/bullet.h

@@ -0,0 +1,18 @@
+#ifndef BULLET_H
+#define BULLET_H
+
+#include "vector.h"
+#include <SDL2/SDL.h>
+
+typedef struct{
+    vec2f position;
+    vec2f velocity;
+    vec2f initial_position;
+}bullet_t;
+
+
+void bullet_init(vec2f* pos, float angle);
+void bullet_draw(SDL_Renderer* r);
+void bullet_update(void);
+
+#endif

src/gamescreen.c

@@ -14,6 +14,7 @@
 #include <time.h>
 #include <SDL2/SDL_ttf.h>
 #include <SDL2/SDL_mixer.h>
+#include "bullet.h"
 
 #define BG_STAR_AMOUNT 30
 #define BG_STAR_SIZE 2
@@ -101,6 +102,8 @@ char game_update(void)
             case SDL_SCANCODE_LEFT:
                 turn = TURN_LEFT;
                 break;
+            /* case SDL_SCANCODE_SPACE: */
+            /*     bullet_init(&player.position, player.rotation); */
             default:
                 break;
             }
@@ -136,6 +139,7 @@ char game_update(void)
     player_update(&player, accelerate, turn);
     asteroid_all_update(&player);
     scrapyards_update(&player);
+    /* bullet_update(); */
 
     if(player.health <= 0)
         return 0;
@@ -159,6 +163,10 @@ void game_draw(void)
 
     scrapyards_draw(r);
 
+    /* SDL_SetRenderDrawColor(r, 255, 255, 255, 255); */
+    /* bullet_draw(r); */
+    /* SDL_SetRenderDrawColor(r, 0, 0, 0, 255); */
+
     // copy texture to back buffer
     player_draw(&player, r);