mirror of
https://github.com/libretro/cpp-cheat.git
synced 2025-04-13 16:50:26 +00:00
106 lines
3.1 KiB
C
106 lines
3.1 KiB
C
/*
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Use controls a square.
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https://www.libsdl.org/release/SDL-1.2.15/docs/html/guideinputkeyboard.html
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*/
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#include "common.h"
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#define WINDOW_WIDTH 600
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#define RECT_WIDTH (WINDOW_WIDTH / 30)
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#define MAX_RECT_POS (WINDOW_WIDTH - RECT_WIDTH)
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#define SCREENS_PER_SECOND 1.0
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/*
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* Get new coordinate of point after a step.
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*
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* Wrap around window width if it would go off.
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**/
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double get_coord(double *x, double step) {
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*x += step;
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*x = fmod(*x, MAX_RECT_POS);
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if (*x < 0)
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*x = MAX_RECT_POS;
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return *x;
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}
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int main(void) {
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SDL_Event event;
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SDL_Rect rect;
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SDL_Renderer *renderer;
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SDL_Window *window;
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double speed_x, speed_y, step, x, y;
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int quit = 0;
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unsigned int current_time, last_time;
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SDL_Init(SDL_INIT_TIMER | SDL_INIT_VIDEO);
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SDL_CreateWindowAndRenderer(WINDOW_WIDTH, WINDOW_WIDTH, 0, &window, &renderer);
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SDL_SetWindowTitle(window, "arrow keys: move");
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x = WINDOW_WIDTH / 2;
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y = WINDOW_WIDTH / 2;
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rect.w = RECT_WIDTH;
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rect.h = RECT_WIDTH;
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speed_x = 0.0;
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speed_y = 0.0;
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last_time = SDL_GetTicks();
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common_fps_init();
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while (!quit) {
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while (SDL_PollEvent(&event) == 1) {
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if (event.type == SDL_QUIT) {
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quit = 1;
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} else if (event.type == SDL_KEYDOWN) {
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switch (event.key.keysym.sym) {
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case SDLK_LEFT:
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speed_x = -1;
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break;
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case SDLK_RIGHT:
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speed_x = 1;
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break;
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case SDLK_UP:
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speed_y = -1;
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break;
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case SDLK_DOWN:
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speed_y = 1;
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break;
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default:
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break;
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}
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} else if (event.type == SDL_KEYUP) {
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switch (event.key.keysym.sym) {
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case SDLK_LEFT:
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speed_x = 0;
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break;
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case SDLK_RIGHT:
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speed_x = 0;
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break;
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case SDLK_UP:
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speed_y = 0;
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break;
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case SDLK_DOWN:
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speed_y = 0;
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break;
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default:
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break;
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}
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}
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}
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current_time = SDL_GetTicks();
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if (current_time != last_time) {
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step = SCREENS_PER_SECOND * MAX_RECT_POS * (current_time - last_time) / 1000.0;
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rect.x = get_coord(&x, step * speed_x);
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rect.y = get_coord(&y, step * speed_y);
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last_time = current_time;
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0);
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SDL_RenderClear(renderer);
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SDL_SetRenderDrawColor(renderer, 255, 0, 0, 255);
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SDL_RenderFillRect(renderer, &rect);
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SDL_RenderPresent(renderer);
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}
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common_fps_update_and_print();
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}
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SDL_DestroyRenderer(renderer);
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SDL_DestroyWindow(window);
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SDL_Quit();
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return EXIT_SUCCESS;
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}
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