Function main

deps/SDL2/Xcode-iOS/Demos/src/touch.c:75–129

}

int
main(int argc, char *argv[])
{

    int x, y, dx, dy;           /* mouse location          */
    Uint8 state;                /* mouse (touch) state */
    SDL_Event event;
    SDL_Window *window;         /* main window */
    SDL_Renderer *renderer;
    int done;                   /* does user want to quit? */
    int w, h;

    /* initialize SDL */
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        fatalError("Could not initialize SDL");
    }

    /* create main window and renderer */
    window = SDL_CreateWindow(NULL, 0, 0, 320, 480, SDL_WINDOW_BORDERLESS | SDL_WINDOW_ALLOW_HIGHDPI);
    renderer = SDL_CreateRenderer(window, 0, 0);

    SDL_GetWindowSize(window, &w, &h);
    SDL_RenderSetLogicalSize(renderer, w, h);

    /* load brush texture */
    initializeTexture(renderer);

    /* fill canvass initially with all black */
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
    SDL_RenderClear(renderer);
    SDL_RenderPresent(renderer);

    done = 0;
    while (!done && SDL_WaitEvent(&event)) {
        switch (event.type) {
        case SDL_QUIT:
            done = 1;
            break;
        case SDL_MOUSEMOTION:
            state = SDL_GetMouseState(&x, &y);  /* get its location */
            SDL_GetRelativeMouseState(&dx, &dy);        /* find how much the mouse moved */
            if (state & SDL_BUTTON_LMASK) {     /* is the mouse (touch) down? */
                drawLine(renderer, x - dx, y - dy, dx, dy);       /* draw line segment */
                SDL_RenderPresent(renderer);
            }
            break;
        }
    }

    /* cleanup */
    SDL_DestroyTexture(brush);
    SDL_Quit();

    return 0;
}