diff options
Diffstat (limited to 'graphics.c')
| -rw-r--r-- | graphics.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/graphics.c b/graphics.c new file mode 100644 index 0000000..2d69c82 --- /dev/null +++ b/graphics.c @@ -0,0 +1,148 @@ +#include "graphics.h" + +#define WINDOW_TITLE "Cardioid" + +#define MIN(x, y) ((x) < (y) ? (x) : (y)) + +#ifdef CARDIOID_RELEASE +# define SDL_CALL(x) x +#else +# define SDL_CALL(x) \ + SDL_ClearError(); \ + x; \ + if (*SDL_GetError() != '\0') { \ + SDL_Log("[ERROR SDL] %s at %s:%d\n\t"#x, \ + SDL_GetError(), __FILE__, __LINE__); \ + exit(EXIT_FAILURE); \ +} +#endif + +static void update(t_state *state); +static void event_handler(t_state *state); +static void get_point(t_state *state, SDL_Point* dst, double index); +static void update_window_value(t_state *state, int width, int height); + +void graphics_init(t_state *state, int width, int height) +{ + SDL_CALL(SDL_Init(SDL_INIT_VIDEO)); + SDL_CALL(state->window = SDL_CreateWindow( + WINDOW_TITLE, + SDL_WINDOWPOS_UNDEFINED, + SDL_WINDOWPOS_UNDEFINED, + width, + height, + SDL_WINDOW_RESIZABLE + )); + SDL_CALL(state->renderer = SDL_CreateRenderer(state->window, -1, 0)); + // looks less blocky, add color to draw with previous color. + // The more lines are drawn to the same place the brighter it is. + SDL_CALL(SDL_SetRenderDrawBlendMode(state->renderer, SDL_BLENDMODE_ADD)); + state->running = true; + state->points_num = POINTS_DEFAULT; + state->factor = FACTOR_DEFAULT; + update_window_value(state, width, height); +} + +void graphics_quit(t_state *state) +{ + SDL_DestroyRenderer(state->renderer); + SDL_DestroyWindow(state->window); + SDL_Quit(); +} + +void graphics_run(t_state *state) +{ + while (state->running) + { + event_handler(state); + update(state); + SDL_Delay(2); + } +} + +static void update(t_state *state) +{ + SDL_Point a; + SDL_Point b; + + SDL_CALL(SDL_SetRenderDrawColor(state->renderer, 0, 0, 0, 255)); + SDL_CALL(SDL_RenderClear(state->renderer)); + + SDL_CALL(SDL_SetRenderDrawColor( + state->renderer, + (LINE_COLOR >> 24) & 0xff, + (LINE_COLOR >> 16) & 0xff, + (LINE_COLOR >> 8 ) & 0xff, + (LINE_COLOR >> 0 ) & 0xff + )); + for (double i = 0.0; i < state->points_num; i += 1.0) + { + get_point(state, &a, i); + get_point(state, &b, i * state->factor); + SDL_CALL(SDL_RenderDrawLine(state->renderer, a.x, a.y, b.x, b.y)); + } + + SDL_CALL(SDL_RenderPresent(state->renderer)); +} + +static void get_point(t_state *state, SDL_Point* dst, double index) +{ + double index_rem = fmod(index, state->points_num); + double radian = M_PI_2 + 2.0 * M_PI * (index_rem / state->points_num); + dst->x = cos(radian) * state->radius + state->center.x; + dst->y = sin(radian) * state->radius + state->center.y; +} + +static void update_window_value(t_state *state, int width, int height) +{ + state->center.x = width / 2.0; + state->center.y = height / 2.0; + state->radius = MIN(width, height) / 2.0 - 10.0; +} + +static void event_handler(t_state *state) +{ + SDL_Event e; + + while (SDL_PollEvent(&e)) + { + switch (e.type) + { + case SDL_QUIT: + state->running = false; + break; + + case SDL_KEYDOWN: + switch (e.key.keysym.sym) + { + case SDLK_j: + case SDLK_DOWN: + if (state->points_num < 3.0) + state->points_num = 0.0; + else + state->points_num -= 3.0; + break; + case SDLK_k: + case SDLK_UP: + state->points_num += 3.0; + break; + case SDLK_u: + case SDLK_LEFT: + if (state->factor < 0.05) + state->factor = 0.0; + else + state->factor -= 0.05; + break; + case SDLK_i: + case SDLK_RIGHT: + state->factor += 0.1; + break; + } + break; + + case SDL_WINDOWEVENT: + if (e.window.event == SDL_WINDOWEVENT_RESIZED) + update_window_value(state, e.window.data1, e.window.data2); + } + } +} |