1 #include
2 #include
3 #include <string.h>
4 #include
5 #include
6 #include
7
8 SDL_Window *sdlWindow = NULL;
9 SDL_Renderer *sdlRender = NULL;
10 SDL_Texture *sdlTexture = NULL;
11 SDL_Rect srcRect;
12 SDL_Rect dstRect;
13 int w = 500;
14 int h = 500;
15
16 bool InitView(int width, int height, const char *iconName)
17 {
18 //初始化窗体
19 SDL_Init(SDL_INIT_VIDEO);
20
21 sdlWindow = SDL_CreateWindow(
22 "The First SDL Program",
23 SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height,
24 SDL_WINDOW_RESIZABLE);
25 if (sdlWindow == NULL) return false;
26
27 //加载窗体图标
28 SDL_Surface *icOnSurface= IMG_Load(iconName);
29 if (icOnSurface== NULL) return false;
30
31 SDL_SetWindowIcon(sdlWindow, iconSurface);
32
33 return true;
34 }
35
36 bool InitDraw(const char *imgName)
37 {
38 //加载渲染器
39 sdlRender = SDL_CreateRenderer(sdlWindow, -1, 0);
40 if (sdlRender == NULL) return false;
41 SDL_SetRenderDrawColor(sdlRender, 255, 255, 255, 255);
42
43 //加载绘画图片
44 SDL_Surface *sdlSurface = IMG_Load(imgName);
45 if (sdlSurface == NULL) return false;
46
47 //加载绘画纹理
48 sdlTexture = SDL_CreateTextureFromSurface(sdlRender, sdlSurface);
49 if (sdlTexture == NULL) return false;
50
51 SDL_FreeSurface(sdlSurface);
52 return true;
53 }
54
55 void UpdateDraw()
56 {
57 SDL_RenderClear(sdlRender);
58
59 //分X宫格
60 const int count = 9;
61 const int sqrtCount = (int)sqrt((double)count);
62 for (int i = 0; i ) {
63 srcRect = SDL_RectMake(0, 0, (w-sqrtCount)/sqrtCount, (h-sqrtCount)/sqrtCount);
64 for (int j = 0; j ) {
65 srcRect.x = srcRect.w*j+(j?1*j:0);
66 srcRect.y = srcRect.h*i+(i?1*i:0);
67
68 //SDL_RectPrint("srcRect", srcRect);
69 SDL_RectCopy(&srcRect, &dstRect);
70 //SDL_RectPrint("dstRect", dstRect);
71 SDL_RenderCopy(sdlRender, sdlTexture, &srcRect, &dstRect);
72 }
73 }
74
75 SDL_RenderPresent(sdlRender);
76 }
77
78 void Quit(int code)
79 {
80 const char *errMsg = SDL_GetError();
81 if (errMsg && strlen(errMsg)) {
82 SDL_Log("Error : %s\n", errMsg);
83 }
84
85 //销毁窗口、渲染器、纹理
86 if (sdlWindow) SDL_DestroyWindow(sdlWindow);
87 if (sdlRender) SDL_DestroyRenderer(sdlRender);
88 if (sdlTexture) SDL_DestroyTexture(sdlTexture);
89 SDL_Quit();
90 exit(code);
91 }
92
93 void HandleKeyEvent(const SDL_Keysym* keysym)
94 {
95 int key = keysym->sym;
96 switch(key)
97 {
98 case SDLK_ESCAPE:
99 Quit(0);
100 break;
101 case SDLK_SPACE:
102 break;
103 case SDLK_UP:
104 case SDLK_DOWN:
105 case SDLK_LEFT:
106 case SDLK_RIGHT:
107 int x, y;
108 SDL_GetWindowPosition(sdlWindow, &x, &y);
109 x = (key == SDLK_LEFT ? x-2 : (key == SDLK_RIGHT ? x+2 : x));
110 y = (key == SDLK_UP ? y-2 : (key == SDLK_DOWN ? y+2 : y));
111 SDL_SetWindowPosition(sdlWindow, x, y);
112 SDL_Log("x=%d, y=%d\n", x, y);
113 break;
114 case SDLK_KP_PLUS:
115 case SDLK_KP_MINUS:
116 w = (key == SDLK_KP_PLUS ? w+2 : w-2);
117 h = (key == SDLK_KP_PLUS ? h+2 : h-2);
118 SDL_SetWindowSize(sdlWindow, w, h);
119 SDL_Log("w=%d, h=%d\n", w, h);
120 break;
121 default:
122 break;
123 }
124 }
125
126 void HandleEvents()
127 {
128 //Our SDL event placeholder.
129 SDL_Event event;
130 //Grab all the events off the queue.
131 while(SDL_PollEvent(&event)) {
132 switch(event.type) {
133 case SDL_KEYDOWN:
134 //Handle key Event
135 HandleKeyEvent(&event.key.keysym);
136 break;
137 case SDL_QUIT:
138 //Handle quit requests (like Ctrl-c).
139 Quit(0);
140 break;
141 }
142 }
143 }
144
145 int main(int argc, char* argv[])
146 {
147 printf("可以通过↑↓←→+ -按键控制移动和大小\n");
148 if (InitView(w, h, "yp.ico") == false) {
149 SDL_Log("sdlWindow is null @_@\n");
150 Quit(0);
151 return -1;
152 }
153
154 char *imgName = "gril.jpg";
155 if (InitDraw(imgName) == false) {
156 SDL_Log("Init Fail @_@\n");
157 Quit(0);
158 return -1;
159 }
160
161 //配置客户区大小
162 SDL_QueryTexture(sdlTexture,NULL, NULL, &w, &h);
163 SDL_SetWindowSize(sdlWindow, w, h);
164 SDL_Log("w=%d, h=%d\n", w, h);
165
166 while (1) {
167 HandleEvents();
168 UpdateDraw();
169 }
170
171 SDL_DestroyWindow(sdlWindow);
172 SDL_Quit();
173 return 0;
174 }