SDL操作笔记

原文地址：https://blog.csdn.net/qq_38124598/article/details/73543184

这里总结一下个人对SDL的一些函数，方便以后查询。

  v1.0.1

1.窗口：

SDL_Init(SDL_INIT_VIDEO);
//创建窗口
SDL_Window*window=SDL_CreateWindow(char*title,int x, int y, int width, int height,);
//获取窗口大小
int win_w,win_h;SDL_GetWindowSize(window,&win_w,&win_h);
//销毁窗口
SDL_DestroyWindow(window);
SDL_Quit();

  
  2.渲染器：

//创建
SDL_Renderer*renderer=SDL_CreateRenderer(window,-,);
//设置透明度
SDL_SetRenderDrawBlendMode(renderer,SDL_BLENDMODE_BLEND);
//清理
SDL_RenderClear(renderer);
//刷新
SDL_RenderPresent(renderer);
//销毁
SDL_DestroyRenderer(renderer); 

   3.加载图片：

#include <SDL2/SDL_image.h>
SDL_Surface*surface=IMG_Load(char*file);

   4.加载文字：

#include <SDL2/SDL_ttf.h>
TTF_Init();
TTF_Font*font=TTF_OpenFont(char*file, int size);
SDL_Surface*surface=TTF_RenderUTF8_Blended_Wrapped(TTF_Font*font, chae*str, SDL_Color color, int width);//文字风格：斜体。另外 TTF_STYLE_BOLD:粗体，TTF_STYLE_UNDERLINE:下划线，TTF_STYLE_STRIKETHROUGH:删除线，TTF_STRLE_NORMAL:正常
TTF_SetFontStyle(TTF_Font*font, TTF_STYLE_ITALIC);
//退出
TTF_CloseFont(font);TTF_Quit(); 

   5.texture：

//surface转换成texture
SDL_Texture*texture=SDL_CreateTextureFromSuface(SDL_Renderer*renderer, SDL_Surface*surface);
//获取texture的长宽的with,height;
SDL_QueryTexture(SDL_Texture*texture, NULL, NULL, &with, &height);

   6.surface：

//销毁
SDL_FreeSurface(SDL_Surface*surface);

  7.设置surface和texture的透明度：

SDL_SetSurfaceBlendMode(SDL_Surface*surface, SDL_BLENDMODE_BLEND);
SDL_SetSurfaceAlphaMod(SDL_Surface*surface, Uint8 alpha);
SDL_SetTextureBlendMode(SDL_Texture*texture, SDL_BLENDMODE_BLEND);
SDL_SetTextureAlphaMod(SDL_Texture*texture, Uint8 alpha); 

  8.画画：

SDL_SetRenderDrawColor(SDL_Renderer*renderer, Uint8 r,Uint8 g, Uint8 b, Uint8 a); //设置画笔颜色
SDL_FillRect(SDL_Renderer*renderer, SDL_Rect*rect); //填充矩形 

  9.在texture上画画：

SDL_Texture*texture=SDL_CreateTexture(SDL_Renderer*renderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_TARGET, int width, int height);
SDL_SetRenderDrawColor(SDL_Renderer*renderer, , , , );
SDL_SetRenderTarget(SDL_Renderer*renderer, SDL_Texture*texture);
SDL_RenderClear(SDL_Renderer*renderer);
...//画画
SDL_SetRenderTarget(SDL_Renderer*renderer, NULL);