抓鼠标的猫（Win32实现，Codeblocks+GCC编译）

//main.cpp
  1 #include <windows.h>
  2 #include <math.h>
  3 //#include <iostream>
  4 //using namespace std;
  5 LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
  6 double WIDTH=410,HEIGHT=430;
  7 double px=0.0,py=0.0;
  8 double ppx=0.0,ppy=0.0;
  9 POINT sp;
 10 int cat=0;
 11 double width,height;
 12 PAINTSTRUCT ps ;
 13 RECT rect ;
 14 POINT pts[3];
 15 double left_eye_px=0.0,right_eye_px=0.0;
 16 double eye_py=0.0;
 17 double eye_r=0.0;
 18 double k=0.0;
 19 double ball_hr=0.0;//半径
 20 double deltax=0.0;
 21 POINT p,pp;
 22 int initGraph=1;
 23 LPPOINT catp;
 24 RECT eye_rect;
 25 HBRUSH  gray_brush =CreateSolidBrush (RGB(180,180,180));
 26 HBRUSH  white_brush =CreateSolidBrush (RGB(255,255,255));
 27 HBRUSH  black_brush =CreateSolidBrush (RGB(0,0,0));
 28 int drawRound(HDC hdc,int x,int y,int r)    //r 直径
 29 {
 30     Ellipse(hdc,x-r/2,y-r/2,x+r/2,y+r/2);
 31     return 0;
 32 }
 33 int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
 34                     PSTR szCmdLine, int iCmdShow)
 35 {
 36     static TCHAR szAppName[] = TEXT ("HelloWin") ;
 37     HWND         hwnd ;
 38     MSG          msg ;
 39     WNDCLASS     wndclass ;
 40     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
 41     wndclass.lpfnWndProc   = WndProc ;
 42     wndclass.cbClsExtra    = 0 ;
 43     wndclass.cbWndExtra    = 0 ;
 44     wndclass.hInstance     = hInstance ;
 45     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
 46     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
 47     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
 48     wndclass.lpszMenuName  = NULL ;
 49     wndclass.lpszClassName = szAppName ;
 50     if (!RegisterClass (&wndclass))
 51     {
 52         MessageBox (NULL, TEXT ("This program requires Windows NT!"),
 53                     szAppName, MB_ICONERROR) ;
 54         return 0 ;
 55     }
 56     hwnd = CreateWindow (szAppName,                  // window class name
 57                          TEXT ("Mouse Hook"), // window caption
 58                          WS_OVERLAPPEDWINDOW,        // window style
 59                          CW_USEDEFAULT,              // initial x position
 60                          CW_USEDEFAULT,              // initial y position
 61                          WIDTH,              // initial x size
 62                          HEIGHT,              // initial y size
 63                          NULL,                       // parent window handle
 64                          NULL,                       // window menu handle
 65                          hInstance,                  // program instance handle
 66                          NULL) ;                     // creation parameters
 67     ShowWindow (hwnd, iCmdShow) ;
 68     UpdateWindow (hwnd) ;
 69     while (GetMessage (&msg, NULL, 0, 0))
 70     {
 71         TranslateMessage (&msg) ;
 72         DispatchMessage (&msg) ;
 73     }
 74     return msg.wParam ;
 75 }
 76 
 77 int init(HWND hwnd)
 78 {
 79     GetClientRect (hwnd, &rect) ;
 80     width=rect.right-rect.left ;
 81     height=rect.bottom-rect.top ;
 82     left_eye_px=width*3/8-height/16;
 83     right_eye_px=width*5/8+height/16;
 84     eye_py=height*5/10-height/16;
 85     eye_r=height/8;
 86     ball_hr=eye_r/8;//半径
 87     px=left_eye_px;
 88     py=eye_py;
 89     ppx=right_eye_px;
 90     ppy=eye_py;
 91     eye_rect.left=left_eye_px-eye_r/2;
 92     eye_rect.right=right_eye_px+eye_r/2;
 93     eye_rect.top=eye_py-eye_r/2;
 94     eye_rect.bottom=eye_py+eye_r/2;
 95     return 0;
 96 }
 97 int drawHand(HDC hdc)
 98 {
 99     /**< 画嘴 */
100     if(cat==0)
101     {
102         MoveToEx (hdc, width/4+width/10,height/48*33, NULL) ;
103         LineTo (hdc, width*3/4-width/10, height/48*33) ;
104         SelectObject (hdc,gray_brush ) ;
105         Ellipse(hdc,width/4-width/20,height/4*3,width/4+width/20,height*1.1);//左胳膊
106         Ellipse(hdc,width/4*3-width/20,height/4*3,width/4*3+width/20,height*1.1);//右胳膊
107         return 0;
108     }
109     SelectObject (hdc, gray_brush) ;
110     Ellipse(hdc,width/4*3-width/20,height/4*3,width/4*3+width/20,height*1.1);//右胳膊
111     Ellipse(hdc,width/4-width/20,height-height/4,width/4+width/20,height);//左胳膊
112     /**< 画脚掌 */
113     Ellipse(hdc,width/4-width/12,height-height/7,width/4+width/12,height);
114     MoveToEx (hdc, width/4-width/15,height-height/9, NULL) ;
115     LineTo (hdc, width/4-width/16, height-height/15) ;
116     MoveToEx (hdc, width/4,height-height/7, NULL) ;
117     LineTo (hdc, width/4, height-height/16) ;
118     MoveToEx (hdc, width/4+width/15,height-height/9, NULL) ;
119     LineTo (hdc, width/4+width/16, height-height/15) ;
120     Arc( hdc, width/4-width/18, height-height/16,width/4+width/18, height,width/4+width/16, height,width/4-width/16, height);
121     /**< 画嘴 */
122     Arc( hdc, width*1/4+width/10,  height/48*27,width*3/4-width/10, height/48*33,width*1/4, height/48*30, width*3/4, height/48*30);
123     return 0;
124 }
125 LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
126 {
127     POINT pc;
128     HDC hdc;
129     switch (message)
130     {
131     case WM_CREATE:
132         init(hwnd);
133         initGraph =1;
134         InvalidateRect (hwnd,NULL, true) ;
135         return 0 ;
136     case WM_SIZE:
137         init(hwnd);
138         initGraph =1;
139         InvalidateRect (hwnd,NULL, true) ;
140         return 0;
141     case WM_MOVE:
142         return 0;
143     case WM_LBUTTONDOWN:
144         GetCursorPos(&pc);
145         if(pc.x==sp.x&&pc.y==sp.y)
146         {
147             cat=0;
148             SetCursorPos(sp.x,sp.y-height/2);
149             ReleaseCapture () ;
150             initGraph=1;
151             InvalidateRect (hwnd,NULL,  true) ;
152         }
153         return 0 ;
154     case WM_MOUSEMOVE:
155         if(cat==1)
156         {
157             SetCursorPos(sp.x,sp.y);
158             return 0;
159         }
160         GetCursorPos(&p);
161         pp=p;
162         ScreenToClient(hwnd,&pp);
163         if((pp.x>width/4-width/12)&&(pp.x<width/4+width/12)&&(pp.y>height-height/7)&&(pp.y<height))
164         {
165             SetCapture (hwnd) ;
166             sp.x=width/4;
167             sp.y=height-height/14;
168             ClientToScreen(hwnd,&sp);
169             cat=1;
170             initGraph=1;
171             InvalidateRect (hwnd,NULL, true) ;
172             return 0;
173         }
174         k=999.0;
175         if(pp.x-left_eye_px!=0)
176         {
177             k=(pp.y-eye_py)/(pp.x-left_eye_px);
178         }
179         deltax=(ball_hr/4)/(1+k*k);
180         deltax=sqrt(deltax);
181         if(!(pp.x>left_eye_px))
182         {
183             deltax=(-1.0)*deltax;
184         }
185         px=left_eye_px+deltax*8;
186         deltax=(ball_hr/4)/(1+1/(k*k));
187         deltax=sqrt(deltax);
188         if(!(pp.y>eye_py))
189         {
190             deltax=(-1.0)*deltax;
191         }
192         py=eye_py+deltax*8;
193         k=999.0;
194         if(pp.x-right_eye_px!=0)
195         {
196             k=(pp.y-eye_py)/(pp.x-right_eye_px);
197         }
198         deltax=(ball_hr/4)/(1+k*k);
199         deltax=sqrt(deltax);
200         if(!(pp.x>right_eye_px))
201         {
202             deltax=(-1.0)*deltax;
203         }
204         ppx=right_eye_px+deltax*8;
205         deltax=(ball_hr/4)/(1+1/(k*k));
206         deltax=sqrt(deltax);
207         if(!(pp.y>eye_py))
208         {
209             deltax=(-1.0)*deltax;
210         }
211         ppy=eye_py+deltax*8;
212         InvalidateRect (hwnd, &eye_rect, false) ;
213         return 0 ;
214     case WM_PAINT:
215         hdc=BeginPaint (hwnd,&ps) ;
216         if(initGraph==1)
217         {
218             SelectObject (hdc, gray_brush) ;
219             Ellipse(hdc,width/6,height/2,width-width/6,height*3/2);//身体
220             /**< 画脸 */
221             Ellipse(hdc,0,height/4,width*20/20,height*3/4);
222             /**< 画耳朵 */
223             pts[0].x =width/4;
224             pts[0].y =height/10;
225             pts[1].x =width/8;
226             pts[1].y =height/9*3;
227             pts[2].x =width/8*3;
228             pts[2].y =height/33*9;
229             Polygon (hdc, pts, 3) ;
230             pts[0].x =width/4*3;
231             pts[0].y =height/10;
232             pts[1].x =width/8*7;
233             pts[1].y =height/9*3;
234             pts[2].x =width/8*5;
235             pts[2].y =height/33*9;
236             Polygon (hdc, pts, 3) ;
237             /**< 画胡子 */
238             MoveToEx (hdc, 0, height/48*27, NULL) ;
239             LineTo (hdc, width/8*2,height/48*27) ;
240             MoveToEx (hdc, 0, height/48*30, NULL) ;
241             LineTo (hdc, width/8*2,height/48*30) ;
242             MoveToEx (hdc, 0, height/48*33, NULL) ;
243             LineTo (hdc, width/8*2,height/48*33) ;
244             MoveToEx (hdc, width, height/48*27, NULL) ;
245             LineTo (hdc, width/8*6,height/48*27) ;
246             MoveToEx (hdc, width, height/48*30, NULL) ;
247             LineTo (hdc, width/8*6,height/48*30) ;
248             MoveToEx (hdc, width, height/48*33, NULL) ;
249             LineTo (hdc, width/8*6,height/48*33) ;
250             drawHand(hdc);
251             initGraph=0;
252         }
253         /**< 画眼睛 */
254         SelectObject (hdc, white_brush) ;
255         drawRound(hdc,left_eye_px,eye_py,eye_r);
256         drawRound(hdc,right_eye_px,eye_py,eye_r);
257         SelectObject (hdc, black_brush) ;
258         drawRound(hdc,px,py,ball_hr*2);
259         drawRound(hdc,ppx,ppy,ball_hr*2);
260         EndPaint (hwnd, &ps) ;
261         return 0 ;
262     case WM_DESTROY:
263         PostQuitMessage (0) ;
264         return 0 ;
265     }
266     return DefWindowProc (hwnd, message, wParam, lParam) ;
267 }