使用SDL_ttf绘制True Type字体

  准备

  SDL_ttf库

  配置dll和lib 我就不细说了可以模仿我demo用cmake配置

  头文件放SDL.h同一个目录

  sample.ttf SourceSansPro-Regular 字体文件

  目的

  使用ttf字体文件 进行文字的渲染

  也就是使用ttf文件 自定义文字的字体显示

  主要绘制一行"Shiver Is Best Awesome"消息文本

  初始化,创建窗口、渲染器等

  TTF_Init() tif初始化

  //Start up SDL and make sure it went ok

  if (SDL_Init(SDL_INIT_VIDEO) != 0) {

  logSDLError(std::cout, "SDL_Init");

  return 1;

  }

  //Also need to init SDL_ttf

  if (TTF_Init() != 0) {

  logSDLError(std::cout, "TTF_Init");

  SDL_Quit();

  return 1;

  }

  //Setup our window and renderer

  SDL_Window* window = SDL_CreateWindow("Lesson 6", SDL_WINDOWPOS_CENTERED,

  SDL_WINDOWPOS_CENTERED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);

  if (window == nullptr) {

  logSDLError(std::cout, "CreateWindow");

  TTF_Quit();

  SDL_Quit();

  return 1;

  }

  SDL_Renderer* renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);

  if (renderer == nullptr) {

  logSDLError(std::cout, "CreateRenderer");

  cleanup(window);

  TTF_Quit();

  SDL_Quit();

  return 1;

  }

  1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.24.25.26.27.28.

  载入字体内容并绘制

  绘制文字需要:

  1.消息文本message

  2.字体文件fontFile

  3.字体颜色color

  4.字体大小fontSize

  const std::string resPa

  th = getResourcePath("Lesson6");

  //We'll render the string "TTF fonts are cool!" in white

  //Color is in RGB format

  SDL_Color color = { 255, 255, 255, 255 };

  SDL_Texture* image = renderText("Shiver is best Aswsome", "..\\..\\res\\06sdl_learn\\sample.ttf", color, 64, renderer);

  if (image == nullptr) {

  cleanup(image, renderer, window);

  TTF_Quit();

  SDL_Quit();

  return 1;

  }

  1.2.3.4.5.6.7.8.9.10.11.12.

  绘制字体过程:

  1.打开字体文件

  2.先根据render,message,color 创建Surface

  3.使用Surface创建Texture

  SDL_Texture* renderText(const std::string& message, const std::string& fontFile, SDL_Color color,

  int fontSize, SDL_Renderer* renderer)

  {

  //Open the font

  TTF_Font* font = TTF_OpenFont(fontFile.c_str(), fontSize);

  if (font == nullptr) {

  logSDLError(std::cout, "TTF_OpenFont");

  return nullptr;

  }郑州哪家精神病医院好http://www.juenpt.com/

  //We need to first render to a surface as that's what TTF_RenderText returns, then

  //load that surface into a texture

  SDL_Surface* surf = TTF_RenderText_Blended(font, message.c_str(), color);

  if (surf == nullptr) {

  TTF_CloseFont(font);

  logSDLError(std::cout, "TTF_RenderText");

  return nullptr;

  }

  SDL_Texture* texture = SDL_CreateTextureFromSurface(renderer, surf);

  if (texture == nullptr) {

  logSDLError(std::cout, "CreateTexture");

  }

  //Clean up the surface and font

  SDL_FreeSurface(surf);

  TTF_CloseFont(font);

  return texture;

  }

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