1、新建MFC应用程序，工程名称为MFCSDL
2、本例使用基于对话框的程序，注意勾选“基于对话框”
3、在MFCSDLDlg.h中添加SDL library 头文件和库文件应用，并定义所需变量。#include "../SDL2-2.0.3/include/sdl.h"#pragma comment(lib, "../SDL2-2.0.3/lib/x86/SDL2.lib")#define WINDOW_W 640#define WINDOW_H 480#define NUM_SPRITES 100#define MAX_SPEED 1static SDL_Window* window;static SDL_Renderer *renderer;static SDL_Texture * sprite;static int window_w, window_h;static int sprite_w, sprite_h;static SDL_Rect *positions, *velocities;
4、添加WM_KICKIDLE消息，该消息为微软保留消息，不公开，用它可以避免自己再重载实现消息循环。具体过程如下:1. 在 MFCSDLdlg.h文件加入afx_msg LRESULT OnKickIdle(WPARAM wParam, LPARAM lParam); 2. 在MFCSDLDlg.cpp中加入消息映射BEGIN_MESSAGE_MAP(CMFCSDLDlg, CDialogEx) ON_WM_PAINT() ON_WM_QUERYDRAGICON() ON_MESSAGE(WM_KICKIDLE,OnKickIdle) ON_WM_CLOSE()END_MESSAGE_MAP()3.添加OnKickIdle消息实现。LRESULT CMFCSDLDlg::OnKickIdle(WPARAM wParam, LPARAM lParam){ SDL_Event event; int done = 0; while (!done) { /* Check for events */ while (SDL_PollEvent(&event)) { switch (event.type) { case SDL_WINDOWEVENT: switch (event.window.event) { case SDL_WINDOWEVENT_EXPOSED: SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF); SDL_RenderClear(renderer); break; } break; case SDL_QUIT: done = 1; break; default: break; } } MoveSprites(renderer, sprite); } return 0; //一定要返回0}
5、在OnInitDialog函数中加入初始化代码。BOOL CMFCSDLDlg::OnInitDialog(){ CDialogEx::OnInitDialog(); // 設定此對話方塊的圖示。當應用程式的主視窗不是對話方塊時， // 框架會自動從事此作業 SetIcon(m_hIcon, TRUE); // 設定大圖示 SetIcon(m_hIcon, FALSE); // 設定小圖示 // TODO: 在此加入額外的初始設定 window = SDL_CreateWindowFrom(m_hWnd); SDL_SetWindowTitle(window, "SDL Native Window Test"); renderer = SDL_CreateRenderer(window, -1, 0); SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF); SDL_RenderClear(renderer); sprite = LoadSprite(renderer, "icon.bmp"); SDL_GetWindowSize(window, &window_w, &window_h); SDL_QueryTexture(sprite, NULL, NULL, &sprite_w, &sprite_h); positions = (SDL_Rect *) SDL_malloc(NUM_SPRITES * sizeof(SDL_Rect)); velocities = (SDL_Rect *) SDL_malloc(NUM_SPRITES * sizeof(SDL_Rect)); if (!positions || !velocities) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Out of memory!\n"); // quit(2); } srand(time(NULL)); for (int i = 0; i < NUM_SPRITES; ++i) { positions[i].x = rand() % (window_w - sprite_w); positions[i].y = rand() % (window_h - sprite_h); positions[i].w = sprite_w; positions[i].h = sprite_h; velocities[i].x = 0; velocities[i].y = 0; while (!velocities[i].x && !velocities[i].y) { velocities[i].x = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED; velocities[i].y = (rand() % (MAX_SPEED * 2 + 1)) - MAX_SPEED; } } return TRUE; // 傳回 TRUE，除非您對控制項設定焦點}
6、在MFCSDLDlg.cpp中，添加LoadSprite函数，注意是static 全局函数，放在所有函数最上方。其作用是加载一个图片精灵，本例使用一个笑脸图片。static SDL_Texture *LoadSprite(SDL_Renderer *renderer, char *file){ SDL_Surface *temp; SDL_Texture *sprite; /* Load the sprite image */ temp = SDL_LoadBMP(file); if (temp == NULL) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't load %s: %s", file, SDL_GetError()); return 0; } /* Set transparent pixel as the pixel at (0,0) */ if (temp->format->palette) { SDL_SetColorKey(temp, 1, *(Uint8 *) temp->pixels); } /* Create textures from the image */ sprite = SDL_CreateTextureFromSurface(renderer, temp); if (!sprite) { SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create texture: %s\n", SDL_GetError()); SDL_FreeSurface(temp); return 0; } SDL_FreeSurface(temp); /* We're ready to roll. :) */ return sprite;}
7、在LoadSprite后添加MoveSprites函数，其作用是将精灵循环移动，实现动态效果。static voidMoveSprites(SDL_Renderer * renderer, SDL_Texture * sprite){ if(renderer==NULL||sprite==NULL) return; int sprite_w, sprite_h; int i; SDL_Rect viewport; SDL_Rect *position, *velocity; /* Query the sizes */ SDL_RenderGetViewport(renderer, &viewport); SDL_QueryTexture(sprite, NULL, NULL, &sprite_w, &sprite_h); /* Draw a gray background */ SDL_SetRenderDrawColor(renderer, 0xA0, 0xA0, 0xA0, 0xFF); SDL_RenderClear(renderer); /* Move the sprite, bounce at the wall, and draw */ for (i = 0; i < NUM_SPRITES; ++i) { position = &positions[i]; velocity = &velocities[i]; position->x += velocity->x; if ((position->x < 0) || (position->x >= (viewport.w - sprite_w))) { velocity->x = -velocity->x; position->x += velocity->x; } position->y += velocity->y; if ((position->y < 0) || (position->y >= (viewport.h - sprite_h))) { velocity->y = -velocity->y; position->y += velocity->y; } /* Blit the sprite onto the screen */ SDL_RenderCopy(renderer, sprite, NULL, position); } /* Update the screen! */ SDL_RenderPresent(renderer);}
8、以上完成，按F7编译，将icon.bmp文件拷贝到程序执行文件加下，运行程序，可看到如图效果。如果对读者有所帮助，请投一篇，thanks.
