打印完图片,是时候打印文字了。这里引用了SDL的字体扩展库,SDL2_ttf.lib,需要包含相应的头文件。
环境:SDL2 + VC++2015
下面的代码将在窗口打印一段文字,并对相应的操作做出响应。
这次把错误处理给精简掉了,代码看起来更清爽。
1 #include <iostream>
2 #include “SDL.h“
3 #include “SDL_ttf.h“
4
5 int main(int argc, char* argv)
6 {
7 //屏幕宽度
8 const int SCREEN_WIDTH = 680;
9 const int SCREEN_HEIGHT = 400;
10 //初始化SDL
11 SDL_Init(SDL_INIT_EVERYTHING);
12 //初始化字体库
13 TTF_Init();
14 //创建窗口
15 SDL_Window window = SDL_CreateWindow(“Font Test“,
16 SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
17 SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
18 //创建渲染器
19 SDL_Renderer renderer = SDL_CreateRenderer(window, -1,
20 SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
21
22 //打开字体
23 TTF_Font font = TTF_OpenFont(“XHei.TTC“, 30);
24 //文本转表面
25 SDL_Color color = { 255, 255, 255 };
26 SDL_Surface surf = TTF_RenderText_Blended(font, “Cool, Cooler, Coolest!“, color);
27 //表面转纹理
28 SDL_Texture text = SDL_CreateTextureFromSurface(renderer, surf);
29 //释放资源
30 SDL_FreeSurface(surf);
31 TTF_CloseFont(font);
32
33 bool quit = false;
34 SDL_Event e;
35 //主循环
36 while (!quit)
37 {
38 //事件栈轮询
39 while (SDL_PollEvent(&e))
40 {
41 //按右上角的X或点鼠标退出
42 if (e.type == SDL_QUIT || e.type == SDL_MOUSEBUTTONDOWN) quit = true;
43 //清空渲染器
44 SDL_RenderClear(renderer);
45 //渲染字体
46 SDL_RenderCopy(renderer, text, NULL, NULL);
47 //呈现渲染器
48 SDL_RenderPresent(renderer);
49 }
50 }
51
52 //释放资源
53 SDL_DestroyTexture(text);
54 SDL_DestroyRenderer(renderer);
55 SDL_DestroyWindow(window);
56
57 SDL_Quit();
58
59 return 0;
60 }