Set visualization

Loop throught each pixel and color it black if its in the set,
white otherwise.
This is eavily inspired by the coding train video on the subject.
(https://www.youtube.com/watch?v=6z7GQewK-Ks)

1 files changed, 22 insertions, 2 deletions

diff --git a/graphics.c b/graphics.c
index e9e12ff..1e7470f 100644
--- a/graphics.c
+++ b/graphics.c
@@ -4,6 +4,7 @@
 #define WINDOW_X 20
 #define WINDOW_Y 20
 
+static void update(GState *state);
 static void event_handler(GState *state);
 static void destroy_state(GState *state);
 static void error_exit_state(GState *state, const char *msg);
@@ -17,7 +18,7 @@ GState *graphics_init(GConf *conf)
     if (SDL_Init(SDL_INIT_VIDEO) < 0)
         error_exit("unable to init SDL");
     state->window = SDL_CreateWindow(WINDOW_TITLE, WINDOW_X, WINDOW_Y,
-                                     conf->window_width, conf->window_height, 0);
+                                     WINDOW_W, WINDOW_H, 0);
     if (state->window == NULL)
         error_exit("unable to create window");
     state->renderer = SDL_CreateRenderer(state->window, -1, 0);
@@ -38,9 +39,28 @@ void graphics_run(GState *state)
     while (state->running)
     {
         event_handler(state);
+        update(state);
+        SDL_Delay(3);
+    }
+}
 
-        SDL_Delay(10);
+static void update(GState *state)
+{
+    SDL_SetRenderDrawColor(state->renderer, 155, 155, 155, SDL_ALPHA_OPAQUE);
+    SDL_RenderClear(state->renderer);
+    for (int x = 0; x < WINDOW_W; x++)
+    {
+        for (int y = 0; y < WINDOW_H; y++)
+        {
+            if (mandelbrot_in_set(map_range((double)x, 0, WINDOW_W, LO, HI)
+                                  + map_range((double)y, 0, WINDOW_H, LO, HI) * I))
+            {
+                SDL_SetRenderDrawColor(state->renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
+                SDL_RenderDrawPoint(state->renderer, x, y);
+            }
+        }
     }
+    SDL_RenderPresent(state->renderer);
 }
 
 static void event_handler(GState *state)