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#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:
/* printf("%d\n", e.window.windowID); */
if (e.window.event == SDL_WINDOWEVENT_RESIZED)
update_window_value(state, e.window.data1, e.window.data2);
}
}
}
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