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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);
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:
switch (e.key.keysym.sym)
{
case SDLK_r:
state->iterations += 10;
state->palette = color_palette_new(state->palette, state->iterations);
break;
case SDLK_e:
state->iterations -= 10;
if (state->iterations <= 0)
state->iterations = 1;
state->palette = color_palette_new(state->palette, state->iterations);
break;
case SDLK_UP:
case SDLK_k:
st_move_vertical(state, false);
break;
case SDLK_DOWN:
case SDLK_j:
st_move_vertical(state, true);
break;
case SDLK_LEFT:
case SDLK_h:
st_move_horizontal(state, false);
break;
case SDLK_RIGHT:
case SDLK_l:
st_move_horizontal(state, true);
break;
case SDLK_EQUALS:
case SDLK_f:
st_zoom(state, true);
break;
case SDLK_MINUS:
case SDLK_d:
st_zoom(state, false);
break;
case SDLK_q:
state->running = 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)
{
int width;
int height;
SDL_QueryTexture(state->texture, NULL, NULL, &width, &height);
double w_ratio = (double)width / (double)e.window.data1;
double h_ratio = (double)height / (double)e.window.data2;
state->real_start /= w_ratio;
state->real_end /= w_ratio;
state->imag_start /= h_ratio;
state->imag_end /= h_ratio;
SDL_DestroyTexture(state->texture);
SDL_CALL(state->texture = SDL_CreateTexture(
state->renderer,
SDL_PIXELFORMAT_RGB888,
SDL_TEXTUREACCESS_STREAMING,
e.window.data1,
e.window.data2
));
}
break;
}
}
}
#define MANDEL_ZOOM_RATIO 30
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 20
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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