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#include "mandel.h"
static void st_zoom(State *state, bool zoom_in);
static void st_move_horizontal(State *state, bool move_right);
static void st_move_vertical(State *state, bool move_down);
static void st_set_key(SDL_Keycode sym, bool value);
static void st_apply_keys(State *state);
static void st_resize(State *state, int new_width, int new_height);
static bool g_key_states[] = {
[KEY_UP] = false,
[KEY_DOWN] = false,
[KEY_RIGHT] = false,
[KEY_LEFT] = false,
[KEY_INC_ITERATIONS] = false,
[KEY_DEC_ITERATIONS] = false,
[KEY_ZOOM_IN] = false,
[KEY_ZOOM_OUT] = false,
};
void event_handle(State *state)
{
SDL_Event e;
while (SDL_PollEvent(&e))
{
switch (e.type)
{
case SDL_QUIT:
state->running = false;
break;
case SDL_KEYDOWN:
if (e.key.keysym.sym == SDLK_ESCAPE)
{
state->running = false;
break;
}
if (e.key.keysym.sym == SDLK_s)
state->smooth = !state->smooth;
else if (e.key.keysym.sym == SDLK_w)
state->samples += 1.0;
else if (e.key.keysym.sym == SDLK_q)
{
state->samples -= 1.0;
if (state->samples <= 0.0)
state->samples = 1.0;
}
else
st_set_key(e.key.keysym.sym, true);
break;
case SDL_KEYUP:
st_set_key(e.key.keysym.sym, false);
break;
case SDL_MOUSEWHEEL:
if (e.wheel.y == -1)
st_zoom(state, true);
else if (e.wheel.y == 1)
st_zoom(state, false);
break;
case SDL_WINDOWEVENT:
if (e.window.event == SDL_WINDOWEVENT_RESIZED)
st_resize(state, e.window.data1, e.window.data2);
break;
}
}
st_apply_keys(state);
}
void st_resize(State *state, int new_width, int new_height)
{
double w_delta = ((double)new_width - (double)state->width) / 2.0;
double h_delta = ((double)new_height - (double)state->height) / 2.0;
double real_dist = state->real_end - state->real_start;
double imag_dist = state->imag_end - state->imag_start;
double width_real_ratio = (double)state->width / real_dist;
double height_imag_ratio = (double)state->height / imag_dist;
w_delta /= width_real_ratio;
h_delta /= height_imag_ratio;
state->real_start -= w_delta;
state->real_end += w_delta;
state->imag_start -= h_delta;
state->imag_end += h_delta;
SDL_GL_GetDrawableSize(state->window, &state->width, &state->height);
GL_CALL(glViewport(0, 0, state->width, state->height));
}
static void st_set_key(SDL_Keycode sym, bool value)
{
switch (sym)
{
case SDLK_r: g_key_states[KEY_INC_ITERATIONS] = value; break;
case SDLK_e: g_key_states[KEY_DEC_ITERATIONS] = value; break;
case SDLK_UP:
case SDLK_k:
g_key_states[KEY_UP] = value;
break;
case SDLK_DOWN:
case SDLK_j:
g_key_states[KEY_DOWN] = value;
break;
case SDLK_LEFT:
case SDLK_h:
g_key_states[KEY_LEFT] = value;
break;
case SDLK_RIGHT:
case SDLK_l:
g_key_states[KEY_RIGHT] = value;
break;
case SDLK_EQUALS:
case SDLK_f:
g_key_states[KEY_ZOOM_IN] = value;
break;
case SDLK_MINUS:
case SDLK_d:
g_key_states[KEY_ZOOM_OUT] = value;
break;
}
}
#define MANDEL_ITERATIONS_DELTA 2
static void st_apply_keys(State *state)
{
if (g_key_states[KEY_INC_ITERATIONS])
state->iterations += MANDEL_ITERATIONS_DELTA;
if (g_key_states[KEY_DEC_ITERATIONS])
{
state->iterations -= MANDEL_ITERATIONS_DELTA;
if (state->iterations <= 0)
state->iterations = 1;
}
if (g_key_states[KEY_UP])
st_move_vertical(state, false);
if (g_key_states[KEY_DOWN])
st_move_vertical(state, true);
if (g_key_states[KEY_LEFT])
st_move_horizontal(state, false);
if (g_key_states[KEY_RIGHT])
st_move_horizontal(state, true);
if (g_key_states[KEY_ZOOM_IN])
st_zoom(state, true);
if (g_key_states[KEY_ZOOM_OUT])
st_zoom(state, false);
}
#define MANDEL_ZOOM_RATIO 64
static void st_zoom(State *state, bool zoom_in)
{
double factor = zoom_in ? 1 : -1;
double real_change = (state->real_end - state->real_start) / MANDEL_ZOOM_RATIO;
double imag_change = (state->imag_end - state->imag_start) / MANDEL_ZOOM_RATIO;
state->real_start += factor * real_change;
state->real_end -= factor * real_change;
state->imag_start += factor * imag_change;
state->imag_end -= factor * imag_change;
}
#define MANDEL_MOVE_RATIO 64
static void st_move_horizontal(State *state, bool move_right)
{
double factor = move_right ? 1 : -1;
double real_change = (state->real_end - state->real_start) / MANDEL_MOVE_RATIO;
state->real_start += factor * real_change;
state->real_end += factor * real_change;
}
static void st_move_vertical(State *state, bool move_down)
{
double factor = move_down ? -1 : 1;
double imag_change = (state->imag_end - state->imag_start) / MANDEL_MOVE_RATIO;
state->imag_start += factor * imag_change;
state->imag_end += factor * imag_change;
}
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