http://www.jb51.net/article/79271.htm
1.定义窗口大小，棋盘大小
SDL_GetWindowSize（）读取窗口大小，
由于棋盘是15*15格局，上下留白一行，在另外加一个状态行，所以每行高度为width/17
2.图片加载
surface = IMG_Load(file）
texture = SDL_CreateTextureFromSurface（render, surface）
free(surface)
return texture;
3.文字加载
pFont = TTF_OpenFont(FontFile, 20)
surface = TTF_RenderUTF8_Blended(pFont, string, color)
texture = SDL_CreateTextureFromSurface（render, surface）
free(surface)
return texture
4.绘制
SDL_RenderClear(pRenderer); 先清空
SDL_RenderCopyEx(pRenderer, pBackTexture, NULL, NULL, 0, NULL, SDL_FLIP_NONE);拷贝texture
//src_rect//dst//angle//center
SDL_RenderPresent(pRenderer);提交显示
5.绘制接口
SDL_RenderDrawLine(SDL_Renderer * renderer, int x1, int y1, int x2, int y2) 画线
SDL_SetRenderDrawColor(SDL_Renderer * renderer, Uint8 r, Uint8 g, Uint8 b, Uint8 a)设置render颜色
SDL_RenderFillRect(SDL_Renderer * renderer, const SDL_Rect * rect)填充颜色
6.事件监听
SDL_QUIT
/* Window events */
SDL_WINDOWEVENT = 0x200, /**< Window state change */
SDL_SYSWMEVENT, /**< System specific event */
/* Keyboard events */
SDL_KEYDOWN = 0x300, /**< Key pressed */
SDL_KEYUP, /**< Key released */
SDL_TEXTEDITING, /**< Keyboard text editing (composition) */
SDL_TEXTINPUT, /**< Keyboard text input */
SDL_KEYMAPCHANGED, /**< Keymap changed due to a system event such as an
input language or keyboard layout change.
*/
/* Mouse events */
SDL_MOUSEMOTION = 0x400, /**< Mouse moved */
SDL_MOUSEBUTTONDOWN, /**< Mouse button pressed */
SDL_MOUSEBUTTONUP, /**< Mouse button released */
SDL_MOUSEWHEEL, /**< Mouse wheel motion */
/* Joystick events */
SDL_JOYAXISMOTION = 0x600, /**< Joystick axis motion */
SDL_JOYBALLMOTION, /**< Joystick trackball motion */
SDL_JOYHATMOTION, /**< Joystick hat position change */
SDL_JOYBUTTONDOWN, /**< Joystick button pressed */
SDL_JOYBUTTONUP, /**< Joystick button released */
SDL_JOYDEVICEADDED, /**< A new joystick has been inserted into the system */
SDL_JOYDEVICEREMOVED, /**< An opened joystick has been removed */
/* Game controller events */
SDL_CONTROLLERAXISMOTION = 0x650, /**< Game controller axis motion */
SDL_CONTROLLERBUTTONDOWN, /**< Game controller button pressed */
SDL_CONTROLLERBUTTONUP, /**< Game controller button released */
SDL_CONTROLLERDEVICEADDED, /**< A new Game controller has been inserted into the system */
SDL_CONTROLLERDEVICEREMOVED, /**< An opened Game controller has been removed */
SDL_CONTROLLERDEVICEREMAPPED, /**< The controller mapping was updated */
/* Touch events */
SDL_FINGERDOWN = 0x700,
SDL_FINGERUP,
SDL_FINGERMOTION,
/* Gesture events */
SDL_DOLLARGESTURE = 0x800,
SDL_DOLLARRECORD,
SDL_MULTIGESTURE,
/* Clipboard events */
SDL_CLIPBOARDUPDATE = 0x900, /**< The clipboard changed */
/* Drag and drop events */
SDL_DROPFILE = 0x1000, /**< The system requests a file open */
SDL_DROPTEXT, /**< text/plain drag-and-drop event */
SDL_DROPBEGIN, /**< A new set of drops is beginning (NULL filename) */
SDL_DROPCOMPLETE, /**< Current set of drops is now complete (NULL filename) */
/* Audio hotplug events */
SDL_AUDIODEVICEADDED = 0x1100, /**< A new audio device is available */
SDL_AUDIODEVICEREMOVED, /**< An audio device has been removed. */
/* Render events */
SDL_RENDER_TARGETS_RESET = 0x2000, /**< The render targets have been reset and their contents need to be updated */
SDL_RENDER_DEVICE_RESET, /**< The device has been reset and all textures need to be recreated */
/** Events ::SDL_USEREVENT through ::SDL_LASTEVENT are for your use,
* and should be allocated with SDL_RegisterEvents()
*/
SDL_USEREVENT = 0x8000,