SDL + SDL_TTF：如何在SDL + SDL_TTF中呈現文本？ （C++）

Question

我試圖在SDL窗口中使用TTF呈現文本時遇到了很多麻煩。我對C++有一點新意，並希望以一種「新手」的方式解釋這一點。 （如果可能，用一些示例代碼？）

謝謝！

Answer 1

這是一個簡單的例子。確保你的目錄中有arial.ttf或你選擇的truetype字體。您需要鏈接-lSDL -lSDL_ttf。

#include "SDL.h" 
#include "SDL_ttf.h" 

SDL_Surface* screen; 
SDL_Surface* fontSurface; 
SDL_Color fColor; 
SDL_Rect fontRect; 

SDL_Event Event; 

TTF_Font* font; 

//Initialize the font, set to white 
void fontInit(){ 
     TTF_Init(); 
     font = TTF_OpenFont("arial.ttf", 12); 
     fColor.r = 255; 
     fColor.g = 255; 
     fColor.b = 255; 
} 

//Print the designated string at the specified coordinates 
void printF(char *c, int x, int y){ 
     fontSurface = TTF_RenderText_Solid(font, c, fColor); 
     fontRect.x = x; 
     fontRect.y = y; 
     SDL_BlitSurface(fontSurface, NULL, screen, &fontRect); 
     SDL_Flip(screen); 
} 

int main(int argc, char** argv) 
{ 
    // Initialize the SDL library with the Video subsystem 
    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_NOPARACHUTE); 

    //Create the screen 
    screen = SDL_SetVideoMode(320, 480, 0, SDL_SWSURFACE); 

    //Initialize fonts 
    fontInit(); 

    //Print to center of screen 
    printF("Hello World", screen->w/2 - 11*3, screen->h/2); 

    do { 
     // Process the events 
     while (SDL_PollEvent(&Event)) { 
      switch (Event.type) { 

       case SDL_KEYDOWN: 
        switch (Event.key.keysym.sym) { 
        // Escape forces us to quit the app 
         case SDLK_ESCAPE: 
          Event.type = SDL_QUIT; 
         break; 

         default: 
         break; 
        } 
       break; 

      default: 
      break; 
     } 
    } 
    SDL_Delay(10); 
    } while (Event.type != SDL_QUIT); 

    // Cleanup 
    SDL_Quit(); 

    return 0; 
}