抠图划线

在贪吃蛇的代码中，我们在定时器中将pa函数注释掉，可以解决其不动的问题，我们用此背景可以进行画图，我们首先可以画一条直线，此时我们不能用HDC去画，应该创建一个临时的HDC和位图，进行画，之后将临时的加载到原HDC中，因为如果不创建临时的，在画完起点后就被release掉了，最后结果就是终点和（0,0）的直线（默认0，0）

  1 #include<Windows.h>
  2 #include "resource.h"
  3 #include <time.h>
  4 typedef char boolean;
  5 #define TRUE 1
  6 #define FALSE 0
  7 
  8 
  9 
 10 
 11  LRESULT CALLBACK MyWndProc(HWND, UINT, WPARAM, LPARAM);
 12 
 13  typedef struct E{
 14     int h,l;
 15     struct E *pnext;
 16     struct E *plast;
 17  }Apple,Snake,node;
 18  
 19  Apple apple={5,6};
 20  Snake *top=NULL;
 21  Snake *end=NULL;
 22 
 23 
 24 
 25 
 26 
 27 HBITMAP h_back;
 28 HBITMAP h_apple;
 29 HBITMAP h_body;
 30 HBITMAP h_l;
 31 HBITMAP h_r;
 32 HBITMAP h_u;
 33 HBITMAP h_d;
 34 int g_fx=1;
 35 void add(int h,int l);
 36 void initSnake();
 37 void show(HDC hdc);
 38 void showApple(HDC hdc);
 39 void showSnake(HDC hdc);
 40 
 41 void pa();
 42 boolean iseat();
 43 void Newapple();
 44 boolean isziyao();
 45 boolean iszhuang();
 46 
 47 
 48 
 49 
 50 
 51 
 52 int WINAPI  WinMain(HINSTANCE hlnstance,HINSTANCE hPrelnstance,
 53             LPSTR lpCmdLine,int nCmdShow){        //callback
 54 
 55 
 56     //设计
 57     HWND hwnd;
 58     MSG  msg;
 59     LPCSTR classname="牟柏旭";
 60     WNDCLASSEX ex;
 61     
 62     ex.style=CS_HREDRAW | CS_VREDRAW;
 63     ex.cbSize=sizeof(WNDCLASSEX);
 64     ex.cbClsExtra=0;
 65     ex.cbWndExtra=0;
 66     ex.hbrBackground=CreateSolidBrush(RGB(171,171,226));
 67     ex.hCursor=NULL;
 68     ex.hIcon=NULL;
 69     ex.hIconSm=NULL;
 70     ex.hInstance=hlnstance;
 71     ex.lpszMenuName=0;
 72     ex.lpszClassName=classname;
 73     ex.lpfnWndProc=MyWndProc;  //消息过程函数  消息回调函数
 74 
 75     //注册
 76      RegisterClassEx(&ex);
 77      //创建
 78      hwnd= CreateWindow(classname,"mubaixu",WS_OVERLAPPEDWINDOW,50,50,620,630,NULL,NULL,
 79             hlnstance,NULL);
 80      SetTimer (hwnd, 1, 500, NULL) ;
 81 
 82      //最后一个为是否创建多文档，比如code可以打开多个程序
 83 
 84 
 85       ShowWindow(hwnd,nCmdShow);
 86 
 87 
 88 
 89     h_back=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP1));
 90     h_apple=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP2));
 91     h_body=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP3));
 92     h_l=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP6));
 93     h_r=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP4));
 94     h_u=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP5));
 95     h_d=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP7));
 96     initSnake();
 97     srand((unsigned int )time(0));
 98       while(GetMessage(&msg,NULL,0,0)){
 99           
100           TranslateMessage(&msg);
101 
102           DispatchMessage(&msg);
103           //调用MyWndProc，系统调用
104         
105           //指定接收哪个窗口的消息，如果为NULL用于接收所有窗口
106           // 后两个为过滤
107       }
108 
109 
110 
111     return 0;
112 }    
113 
114 int xx=200;
115 HDC tmp_dc;
116 HBITMAP tmp_bitmap;
117 LRESULT CALLBACK MyWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam){
118     int x,y;
119 
120 
121 //    char tx[10];
122     //char ty[10];
123     HDC hdc;
124     //temp_hdc;
125     //HBRUSH newbrush;
126     //HBRUSH oldbrush;
127     PAINTSTRUCT ps;
128 
129 //    HBITMAP hbitmap ;
130 
131     switch (Msg)
132     {
133 
134     case WM_KEYDOWN:
135             switch (wParam)
136             {
137                  case VK_UP:
138                       g_fx=1;
139                      break;
140                  case VK_DOWN:
141                        g_fx=3;
142                      break;
143                  case VK_RIGHT:
144                      g_fx=0;
145                      break;
146                  case VK_LEFT:
147                       g_fx=2;
148                      break;
149 
150                 default:
151                     break;
152             }
153         break;
154 
155     /*case WM_MOUSEMOVE:
156         hdc = GetDC (hWnd) ;
157 
158         x = LOWORD (lParam) ;
159         y = HIWORD (lParam) ;
160 
161         LineTo (tmp_dc, x, y) ;
162         BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
163         ReleaseDC (hWnd, hdc) ;
164 
165         break;*/
166     case WM_LBUTTONDOWN:
167     
168     
169         hdc = GetDC (hWnd) ;
170    
171 
172      //   Rectangle(hdc, 150,150,200,200);
173 
174         //创建临时的hdc和位图，并且把原图传过去
175         tmp_dc=CreateCompatibleDC(hdc);
176         tmp_bitmap=CreateCompatibleBitmap(hdc,620,630);
177         SelectObject(tmp_dc,tmp_bitmap);
178         BitBlt(tmp_dc,0,0,620,630,hdc,0,0,SRCCOPY);
179 
180         x = LOWORD (lParam) ;
181         y = HIWORD (lParam) ;
182         //MessageBox (hWnd,itoa(x,tx,10),itoa(y,ty,10),MB_OKCANCEL);*/
183 
184         MoveToEx (tmp_dc, x, y, NULL) ;
185 
186         
187         ReleaseDC (hWnd, hdc) ;
188         break;
189 
190     case WM_LBUTTONUP:
191         hdc = GetDC (hWnd) ;
192 
193         x = LOWORD (lParam) ;
194         y = HIWORD (lParam) ;
195 
196         LineTo (tmp_dc, x, y) ;
197         BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
198 
199         DeleteObject(tmp_dc);
200         DeleteObject(tmp_bitmap);
201         ReleaseDC (hWnd, hdc) ;
202 
203         break;
204     case WM_CLOSE:
205         PostQuitMessage(0);
206 
207         break;
208     
209     case WM_PAINT:
210         hdc = BeginPaint (hWnd, &ps) ;
211 
212         show(hdc);
213 
214         //Rectangle(hdc, 50,50,100,100);
215         //hbitmap = CreateCompatibleBitmap (hdc, 100, 200) ;
216         //temp_hdc = CreateCompatibleDC (hdc) ;
217         //SelectObject(temp_hdc,h_back);    
218         ////Rectangle(temp_hdc, 10,10,50,50);
219     
220         //BitBlt (hdc, 0,0, 600, 600, temp_hdc, 0, 0, SRCCOPY) ;
221 
222         //xx+=20;
223         //Ellipse( hdc, xx, 300, xx+70, 340);
224 
225           EndPaint (hWnd, &ps) ;
226         break;
227 
228     case WM_TIMER:
229 
230 
231 
232         //pa();
233         if(iseat()){
234             Newapple();
235             add(-20,-20);
236         }
237         if(isziyao()||iszhuang()){
238             PostQuitMessage(0);
239         }
240 
241         hdc = GetDC (hWnd) ;
242             //show(hdc);重绘
243         /*newbrush= CreateSolidBrush(RGB(171,171,226));//椭圆更新移动
244         oldbrush=(HBRUSH)SelectObject(hdc,newbrush);
245          Rectangle( hdc, 0, 0,600,600);
246           
247         DeleteObject(newbrush);
248         SelectObject(hdc,oldbrush);
249         xx+=20;
250         Ellipse( hdc, xx, 300, xx+70, 340);
251             Rectangle(hdc, 50,50,100,100);*/
252         ReleaseDC (hWnd, hdc) ;
253         break;
254     default:
255         break;
256     }
257     //系统默认的消息处理函数
258     return DefWindowProc(hWnd,Msg,wParam,lParam);
259 }
260 
261 
262 
263  void add(int h,int l){
264       node * pnode=(node *)malloc(sizeof(node));
265       pnode->h=h;
266       pnode->l=l;
267       pnode->plast=NULL;
268       pnode->pnext=NULL;
269       if(top==NULL){
270         top=pnode;
271       }
272       else{
273           pnode->plast=end;
274           end->pnext=pnode;
275       }
276 
277       end=pnode;
278  }
279 
280 
281  void initSnake(){
282     int i;
283      for( i=8;i<=10;i++){
284          add(i,10);
285      }
286 
287  }
288 
289  void show(HDC hdc){
290     HDC temp_hdc;
291     temp_hdc = CreateCompatibleDC (hdc) ;
292     SelectObject(temp_hdc,h_back);    
293     
294     BitBlt (hdc, 0,0, 600, 600, temp_hdc, 0, 0, SRCCOPY) ;
295     DeleteObject(temp_hdc);
296     showApple( hdc);
297     showSnake( hdc);
298  }
299  void showApple(HDC hdc){
300     HDC temp_hdc;
301     temp_hdc = CreateCompatibleDC (hdc) ;
302     SelectObject(temp_hdc,h_apple);    
303     
304     BitBlt (hdc, apple.l*30+30,apple.h*30+30, 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
305     DeleteObject(temp_hdc);
306  }
307  void showSnake(HDC hdc){
308     HDC temp_hdc;
309     Snake *ptop=top;
310     temp_hdc = CreateCompatibleDC (hdc) ;
311     switch (g_fx)
312     {
313 
314     case 0:
315         SelectObject(temp_hdc,h_r);    
316         break;
317     case 1:
318         SelectObject(temp_hdc,h_u);    
319         break;
320     case 2:
321         SelectObject(temp_hdc,h_l);    
322         break;
323     case 3:
324         SelectObject(temp_hdc,h_d);    
325         break;
326     default:
327         break;
328     }
329 
330     
331     BitBlt (hdc, top->l*30+30,top->h*30+30  , 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
332     DeleteObject(temp_hdc);
333 
334     
335     temp_hdc = CreateCompatibleDC (hdc) ;
336     SelectObject(temp_hdc,h_body);    
337     ptop=ptop->pnext;
338     while(ptop){
339         
340         BitBlt (hdc, ptop->l*30+30,ptop->h*30+30  , 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
341         ptop=ptop->pnext;
342     }
343     DeleteObject(temp_hdc);
344 
345  }
346 
347  void pa(){
348     Snake *jend=end;
349     while(jend->plast!=NULL)
350     {
351         jend->h=jend->plast->h;
352         jend->l=jend->plast->l;
353 
354         jend=jend->plast;
355     }
356     switch(g_fx)
357      {
358      case 0:
359          top->l++;
360          break;
361      case 1:
362          top->h--;
363          break;
364      case 2:
365          top->l--;
366          break;
367      case 3:
368          top->h++;
369          break;
370 
371      }
372  }
373  boolean iseat(){
374      if(top->h==apple.h &&top->l==apple.l )
375          return TRUE;
376      return FALSE;
377  }
378  void Newapple(){
379      apple.l=rand()%18;
380      apple.h=rand()%18;
381  }
382  boolean isziyao(){
383      Snake *pbody=top->pnext;
384      while(pbody!=NULL){
385          if(top->h==pbody->h &&top->l==pbody->l )
386              return TRUE;
387          pbody=pbody->pnext;
388      }
389     return FALSE;
390  }
391  boolean iszhuang(){
392      if(top->h>17||top->l<0||top->l>17||top->h<0)
393     {
394         return TRUE;
395     }
396      return FALSE;
397  }

此时如果加上WM_MOUSEMOVE 就会变成了一纸笔

 1 case WM_MOUSEMOVE:
 2         hdc = GetDC (hWnd) ;
 3 
 4         x = LOWORD (lParam) ;
 5         y = HIWORD (lParam) ;
 6 
 7         LineTo (tmp_dc, x, y) ;
 8         BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
 9 
10         ReleaseDC (hWnd, hdc) ;
11 
12         break;

在第一张图中，我们可以多次画很多条线，我们怎么才能在图面上显示一条线？

我们可以再次创建一个src_hdc和map，来存储原来的图片，每次画新的线的时候，我们都将其src给hdc，在通过hdc给tmp_hcd，这样就能保证每次画新的线的时候旧的线就没了

 1     case WM_LBUTTONDOWN:
 2     
 3     
 4         hdc = GetDC (hWnd) ;
 5             x = LOWORD (lParam) ;
 6         y = HIWORD (lParam) ;
 7         if(type==0){
 8             begin_x=x;
 9             begin_y=y;
10             src_dc=CreateCompatibleDC(hdc);
11             src_bitmap=CreateCompatibleBitmap(hdc,620,630);
12             SelectObject(src_dc,src_bitmap);
13             BitBlt(src_dc,0,0,620,630,hdc,0,0,SRCCOPY);
14             type=1;
15         }
16 
17 
18      //   Rectangle(hdc, 150,150,200,200);
19 
20         if(1==type){
21             //创建临时的hdc和位图，并且把原图传过去
22             BitBlt(hdc,0,0,620,630,src_dc,0,0,SRCCOPY);//把原hdc弄干净
23             tmp_dc=CreateCompatibleDC(hdc);
24             tmp_bitmap=CreateCompatibleBitmap(hdc,620,630);
25             SelectObject(tmp_dc,tmp_bitmap);
26             BitBlt(tmp_dc,0,0,620,630,hdc,0,0,SRCCOPY);
27 
28     
29             //MessageBox (hWnd,itoa(x,tx,10),itoa(y,ty,10),MB_OKCANCEL);*/
30 
31             MoveToEx (tmp_dc, x, y, NULL) ;
32 
33         }
34         ReleaseDC (hWnd, hdc) ;
35         break;
36 
37     case WM_LBUTTONUP:
38         hdc = GetDC (hWnd) ;
39 
40         x = LOWORD (lParam) ;
41         y = HIWORD (lParam) ;
42 
43 
44         LineTo (tmp_dc, x, y) ;
45         BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
46         
47 
48 
49         DeleteObject(tmp_dc);
50         DeleteObject(tmp_bitmap);
51         ReleaseDC (hWnd, hdc) ;
52 
53         break;

加上下面的每次只能画一条随意弯曲的线

 1     //case WM_MOUSEMOVE:
 2     //    hdc = GetDC (hWnd) ;
 3 
 4     //    x = LOWORD (lParam) ;
 5     //    y = HIWORD (lParam) ;
 6 
 7     //    LineTo (tmp_dc, x, y) ;
 8     //    BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
 9 
10     //    ReleaseDC (hWnd, hdc) ; 
11 
12     //    break;

我们可以设置begin_x,begin_y来标定我们起始点，之后我们在moucemove里面画4根线

就画出了一个矩形

    case WM_MOUSEMOVE:
        hdc = GetDC (hWnd) ;

        x = LOWORD (lParam) ;
        y = HIWORD (lParam) ;
        BitBlt(tmp_dc,0,0,620,630,src_dc,0,0,SRCCOPY);
        //1根线
        MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
        LineTo (tmp_dc,begin_x, y) ;

        //2根
        MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
        LineTo (tmp_dc, x, begin_y) ;
        //3根
        MoveToEx (tmp_dc, x, begin_y, NULL) ;
        LineTo (tmp_dc, x, y) ;
        //4根
        MoveToEx (tmp_dc, begin_x,y, NULL) ;
        LineTo (tmp_dc, x, y) ;



        BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);

        ReleaseDC (hWnd, hdc) ; 

        break;

下面就是画线不重复的代码

  1 #include<Windows.h>
  2 #include "resource.h"
  3 #include <time.h>
  4 typedef char boolean;
  5 #define TRUE 1
  6 #define FALSE 0
  7 
  8 
  9 
 10 
 11  LRESULT CALLBACK MyWndProc(HWND, UINT, WPARAM, LPARAM);
 12 
 13  typedef struct E{
 14     int h,l;
 15     struct E *pnext;
 16     struct E *plast;
 17  }Apple,Snake,node;
 18  
 19  Apple apple={5,6};
 20  Snake *top=NULL;
 21  Snake *end=NULL;
 22 
 23 
 24 
 25 
 26 
 27 HBITMAP h_back;
 28 HBITMAP h_apple;
 29 HBITMAP h_body;
 30 HBITMAP h_l;
 31 HBITMAP h_r;
 32 HBITMAP h_u;
 33 HBITMAP h_d;
 34 int g_fx=1;
 35 void add(int h,int l);
 36 void initSnake();
 37 void show(HDC hdc);
 38 void showApple(HDC hdc);
 39 void showSnake(HDC hdc);
 40 
 41 void pa();
 42 boolean iseat();
 43 void Newapple();
 44 boolean isziyao();
 45 boolean iszhuang();
 46 
 47 
 48 
 49 
 50 
 51 
 52 int WINAPI  WinMain(HINSTANCE hlnstance,HINSTANCE hPrelnstance,
 53             LPSTR lpCmdLine,int nCmdShow){        //callback
 54 
 55 
 56     //设计
 57     HWND hwnd;
 58     MSG  msg;
 59     LPCSTR classname="牟柏旭";
 60     WNDCLASSEX ex;
 61     
 62     ex.style=CS_HREDRAW | CS_VREDRAW;
 63     ex.cbSize=sizeof(WNDCLASSEX);
 64     ex.cbClsExtra=0;
 65     ex.cbWndExtra=0;
 66     ex.hbrBackground=CreateSolidBrush(RGB(171,171,226));
 67     ex.hCursor=NULL;
 68     ex.hIcon=NULL;
 69     ex.hIconSm=NULL;
 70     ex.hInstance=hlnstance;
 71     ex.lpszMenuName=0;
 72     ex.lpszClassName=classname;
 73     ex.lpfnWndProc=MyWndProc;  //消息过程函数  消息回调函数
 74 
 75     //注册
 76      RegisterClassEx(&ex);
 77      //创建
 78      hwnd= CreateWindow(classname,"mubaixu",WS_OVERLAPPEDWINDOW,50,50,620,630,NULL,NULL,
 79             hlnstance,NULL);
 80      SetTimer (hwnd, 1, 500, NULL) ;
 81 
 82      //最后一个为是否创建多文档，比如code可以打开多个程序
 83 
 84 
 85       ShowWindow(hwnd,nCmdShow);
 86 
 87 
 88 
 89     h_back=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP1));
 90     h_apple=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP2));
 91     h_body=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP3));
 92     h_l=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP6));
 93     h_r=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP4));
 94     h_u=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP5));
 95     h_d=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP7));
 96     initSnake();
 97     srand((unsigned int )time(0));
 98       while(GetMessage(&msg,NULL,0,0)){
 99           
100           TranslateMessage(&msg);
101 
102           DispatchMessage(&msg);
103           //调用MyWndProc，系统调用
104         
105           //指定接收哪个窗口的消息，如果为NULL用于接收所有窗口
106           // 后两个为过滤
107       }
108 
109 
110 
111     return 0;
112 }    
113 
114 int xx=200;
115 HDC tmp_dc;
116 HBITMAP tmp_bitmap;
117 HDC src_dc;
118 HBITMAP src_bitmap;
119 int type=0;
120 int begin_x=0;
121 int begin_y=0;
122 LRESULT CALLBACK MyWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam){
123     int x,y;
124 
125 
126 //    char tx[10];
127     //char ty[10];
128     HDC hdc;
129     //temp_hdc;
130     //HBRUSH newbrush;
131     //HBRUSH oldbrush;
132     PAINTSTRUCT ps;
133 
134 //    HBITMAP hbitmap ;
135 
136     switch (Msg)
137     {
138 
139     case WM_KEYDOWN:
140             switch (wParam)
141             {
142                  case VK_UP:
143                       g_fx=1;
144                      break;
145                  case VK_DOWN:
146                        g_fx=3;
147                      break;
148                  case VK_RIGHT:
149                      g_fx=0;
150                      break;
151                  case VK_LEFT:
152                       g_fx=2;
153                      break;
154 
155                 default:
156                     break;
157             }
158         break;
159 
160     //case WM_MOUSEMOVE:
161     //    hdc = GetDC (hWnd) ;
162 
163     //    x = LOWORD (lParam) ;
164     //    y = HIWORD (lParam) ;
165 
166     //    if(type==1){
167 
168     //    BitBlt(tmp_dc,0,0,620,630,src_dc,0,0,SRCCOPY);
169     //    //1根线
170     //    MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
171     //    LineTo (tmp_dc,begin_x, y) ;
172 
173     //    //2根
174     //    MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
175     //    LineTo (tmp_dc, x, begin_y) ;
176     //    //3根
177     //    MoveToEx (tmp_dc, x, begin_y, NULL) ;
178     //    LineTo (tmp_dc, x, y) ;
179     //    //4根
180     //    MoveToEx (tmp_dc, begin_x,y, NULL) ;
181     //    LineTo (tmp_dc, x, y) ;
182 
183 
184     //    }
185     //    BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
186 
187     //    ReleaseDC (hWnd, hdc) ; 
188 
189     //    break;
190     case WM_LBUTTONDOWN:
191     
192     
193         hdc = GetDC (hWnd) ;
194             x = LOWORD (lParam) ;
195         y = HIWORD (lParam) ;
196         if(type==0){
197             begin_x=x;
198             begin_y=y;
199             src_dc=CreateCompatibleDC(hdc);
200             src_bitmap=CreateCompatibleBitmap(hdc,620,630);
201             SelectObject(src_dc,src_bitmap);
202             BitBlt(src_dc,0,0,620,630,hdc,0,0,SRCCOPY);
203 
204             type=1;
205         }
206 
207 
208      //   Rectangle(hdc, 150,150,200,200);
209 
210         if(1==type){
211             //创建临时的hdc和位图，并且把原图传过去
212             BitBlt(hdc,0,0,620,630,src_dc,0,0,SRCCOPY);//把原hdc弄干净
213             tmp_dc=CreateCompatibleDC(hdc);
214             tmp_bitmap=CreateCompatibleBitmap(hdc,620,630);
215             SelectObject(tmp_dc,tmp_bitmap);
216             BitBlt(tmp_dc,0,0,620,630,hdc,0,0,SRCCOPY);
217 
218     
219             //MessageBox (hWnd,itoa(x,tx,10),itoa(y,ty,10),MB_OKCANCEL);*/
220 
221             MoveToEx (tmp_dc, x, y, NULL) ;
222 
223         }
224         ReleaseDC (hWnd, hdc) ;
225         break;
226 
227     case WM_LBUTTONUP:
228         hdc = GetDC (hWnd) ;
229 
230         x = LOWORD (lParam) ;
231         y = HIWORD (lParam) ;
232 
233         if(type==1){
234             //画线结束
235             LineTo (tmp_dc, x, y) ;
236             BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
237             DeleteObject(tmp_dc);
238             DeleteObject(tmp_bitmap);
239             //抠图
240         }
241 
242         ReleaseDC (hWnd, hdc) ;
243 
244         break;
245     case WM_CLOSE:
246         PostQuitMessage(0);
247 
248         break;
249     
250     case WM_PAINT:
251         hdc = BeginPaint (hWnd, &ps) ;
252 
253         show(hdc);
254 
255         //Rectangle(hdc, 50,50,100,100);
256         //hbitmap = CreateCompatibleBitmap (hdc, 100, 200) ;
257         //temp_hdc = CreateCompatibleDC (hdc) ;
258         //SelectObject(temp_hdc,h_back);    
259         ////Rectangle(temp_hdc, 10,10,50,50);
260     
261         //BitBlt (hdc, 0,0, 600, 600, temp_hdc, 0, 0, SRCCOPY) ;
262 
263         //xx+=20;
264         //Ellipse( hdc, xx, 300, xx+70, 340);
265 
266           EndPaint (hWnd, &ps) ;
267         break;
268 
269     case WM_TIMER:
270 
271 
272 
273         //pa();
274         if(iseat()){
275             Newapple();
276             add(-20,-20);
277         }
278         if(isziyao()||iszhuang()){
279             PostQuitMessage(0);
280         }
281 
282         hdc = GetDC (hWnd) ;
283             //show(hdc);重绘
284         /*newbrush= CreateSolidBrush(RGB(171,171,226));//椭圆更新移动
285         oldbrush=(HBRUSH)SelectObject(hdc,newbrush);
286          Rectangle( hdc, 0, 0,600,600);
287           
288         DeleteObject(newbrush);
289         SelectObject(hdc,oldbrush);
290         xx+=20;
291         Ellipse( hdc, xx, 300, xx+70, 340);
292             Rectangle(hdc, 50,50,100,100);*/
293         ReleaseDC (hWnd, hdc) ;
294         break;
295     default:
296         break;
297     }
298     //系统默认的消息处理函数
299     return DefWindowProc(hWnd,Msg,wParam,lParam);
300 }
301 
302 
303 
304  void add(int h,int l){
305       node * pnode=(node *)malloc(sizeof(node));
306       pnode->h=h;
307       pnode->l=l;
308       pnode->plast=NULL;
309       pnode->pnext=NULL;
310       if(top==NULL){
311         top=pnode;
312       }
313       else{
314           pnode->plast=end;
315           end->pnext=pnode;
316       }
317 
318       end=pnode;
319  }
320 
321 
322  void initSnake(){
323     int i;
324      for( i=8;i<=10;i++){
325          add(i,10);
326      }
327 
328  }
329 
330  void show(HDC hdc){
331     HDC temp_hdc;
332     temp_hdc = CreateCompatibleDC (hdc) ;
333     SelectObject(temp_hdc,h_back);    
334     
335     BitBlt (hdc, 0,0, 600, 600, temp_hdc, 0, 0, SRCCOPY) ;
336     DeleteObject(temp_hdc);
337     showApple( hdc);
338     showSnake( hdc);
339  }
340  void showApple(HDC hdc){
341     HDC temp_hdc;
342     temp_hdc = CreateCompatibleDC (hdc) ;
343     SelectObject(temp_hdc,h_apple);    
344     
345     BitBlt (hdc, apple.l*30+30,apple.h*30+30, 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
346     DeleteObject(temp_hdc);
347  }
348  void showSnake(HDC hdc){
349     HDC temp_hdc;
350     Snake *ptop=top;
351     temp_hdc = CreateCompatibleDC (hdc) ;
352     switch (g_fx)
353     {
354 
355     case 0:
356         SelectObject(temp_hdc,h_r);    
357         break;
358     case 1:
359         SelectObject(temp_hdc,h_u);    
360         break;
361     case 2:
362         SelectObject(temp_hdc,h_l);    
363         break;
364     case 3:
365         SelectObject(temp_hdc,h_d);    
366         break;
367     default:
368         break;
369     }
370 
371     
372     BitBlt (hdc, top->l*30+30,top->h*30+30  , 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
373     DeleteObject(temp_hdc);
374 
375     
376     temp_hdc = CreateCompatibleDC (hdc) ;
377     SelectObject(temp_hdc,h_body);    
378     ptop=ptop->pnext;
379     while(ptop){
380         
381         BitBlt (hdc, ptop->l*30+30,ptop->h*30+30  , 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
382         ptop=ptop->pnext;
383     }
384     DeleteObject(temp_hdc);
385 
386  }
387 
388  void pa(){
389     Snake *jend=end;
390     while(jend->plast!=NULL)
391     {
392         jend->h=jend->plast->h;
393         jend->l=jend->plast->l;
394 
395         jend=jend->plast;
396     }
397     switch(g_fx)
398      {
399      case 0:
400          top->l++;
401          break;
402      case 1:
403          top->h--;
404          break;
405      case 2:
406          top->l--;
407          break;
408      case 3:
409          top->h++;
410          break;
411 
412      }
413  }
414  boolean iseat(){
415      if(top->h==apple.h &&top->l==apple.l )
416          return TRUE;
417      return FALSE;
418  }
419  void Newapple(){
420      apple.l=rand()%18;
421      apple.h=rand()%18;
422  }
423  boolean isziyao(){
424      Snake *pbody=top->pnext;
425      while(pbody!=NULL){
426          if(top->h==pbody->h &&top->l==pbody->l )
427              return TRUE;
428          pbody=pbody->pnext;
429      }
430     return FALSE;
431  }
432  boolean iszhuang(){
433      if(top->h>17||top->l<0||top->l>17||top->h<0)
434     {
435         return TRUE;
436     }
437      return FALSE;
438  }

View Code

上面我们画了矩形，我们需要把这个矩形扣下来，放在t_dc里面，之后将这个矩形变成白色

  1 #include<Windows.h>
  2 #include "resource.h"
  3 #include <time.h>
  4 typedef char boolean;
  5 #define TRUE 1
  6 #define FALSE 0
  7 
  8 
  9 
 10 
 11  LRESULT CALLBACK MyWndProc(HWND, UINT, WPARAM, LPARAM);
 12 
 13  typedef struct E{
 14     int h,l;
 15     struct E *pnext;
 16     struct E *plast;
 17  }Apple,Snake,node;
 18  
 19  Apple apple={5,6};
 20  Snake *top=NULL;
 21  Snake *end=NULL;
 22 
 23 
 24 
 25 
 26 
 27 HBITMAP h_back;
 28 HBITMAP h_apple;
 29 HBITMAP h_body;
 30 HBITMAP h_l;
 31 HBITMAP h_r;
 32 HBITMAP h_u;
 33 HBITMAP h_d;
 34 int g_fx=1;
 35 void add(int h,int l);
 36 void initSnake();
 37 void show(HDC hdc);
 38 void showApple(HDC hdc);
 39 void showSnake(HDC hdc);
 40 
 41 void pa();
 42 boolean iseat();
 43 void Newapple();
 44 boolean isziyao();
 45 boolean iszhuang();
 46 
 47 
 48 
 49 
 50 
 51 
 52 int WINAPI  WinMain(HINSTANCE hlnstance,HINSTANCE hPrelnstance,
 53             LPSTR lpCmdLine,int nCmdShow){        //callback
 54 
 55 
 56     //设计
 57     HWND hwnd;
 58     MSG  msg;
 59     LPCSTR classname="牟柏旭";
 60     WNDCLASSEX ex;
 61     
 62     ex.style=CS_HREDRAW | CS_VREDRAW;
 63     ex.cbSize=sizeof(WNDCLASSEX);
 64     ex.cbClsExtra=0;
 65     ex.cbWndExtra=0;
 66     ex.hbrBackground=CreateSolidBrush(RGB(171,171,226));
 67     ex.hCursor=NULL;
 68     ex.hIcon=NULL;
 69     ex.hIconSm=NULL;
 70     ex.hInstance=hlnstance;
 71     ex.lpszMenuName=0;
 72     ex.lpszClassName=classname;
 73     ex.lpfnWndProc=MyWndProc;  //消息过程函数  消息回调函数
 74 
 75     //注册
 76      RegisterClassEx(&ex);
 77      //创建
 78      hwnd= CreateWindow(classname,"mubaixu",WS_OVERLAPPEDWINDOW,50,50,620,630,NULL,NULL,
 79             hlnstance,NULL);
 80      SetTimer (hwnd, 1, 500, NULL) ;
 81 
 82      //最后一个为是否创建多文档，比如code可以打开多个程序
 83 
 84 
 85       ShowWindow(hwnd,nCmdShow);
 86 
 87 
 88 
 89     h_back=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP1));
 90     h_apple=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP2));
 91     h_body=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP3));
 92     h_l=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP6));
 93     h_r=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP4));
 94     h_u=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP5));
 95     h_d=LoadBitmap(hlnstance,MAKEINTRESOURCE(IDB_BITMAP7));
 96     initSnake();
 97     srand((unsigned int )time(0));
 98       while(GetMessage(&msg,NULL,0,0)){
 99           
100           TranslateMessage(&msg);
101 
102           DispatchMessage(&msg);
103           //调用MyWndProc，系统调用
104         
105           //指定接收哪个窗口的消息，如果为NULL用于接收所有窗口
106           // 后两个为过滤
107       }
108 
109 
110 
111     return 0;
112 }    
113 
114 int xx=200;
115 HDC tmp_dc;
116 HBITMAP tmp_bitmap;
117 HDC src_dc;
118 HBITMAP src_bitmap;
119 
120 HDC t_dc;
121 HBITMAP t_bitmap;
122 int type=0;
123 int begin_x=0;
124 int begin_y=0;
125 int end_x;
126 int end_y;
127 LRESULT CALLBACK MyWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam){
128     int x,y;
129 
130 
131 //    char tx[10];
132     //char ty[10];
133     HDC hdc;
134     //temp_hdc;
135     //HBRUSH newbrush;
136     //HBRUSH oldbrush;
137     PAINTSTRUCT ps;
138 
139 //    HBITMAP hbitmap ;
140 
141     switch (Msg)
142     {
143 
144     case WM_KEYDOWN:
145             switch (wParam)
146             {
147                  case VK_UP:
148                       g_fx=1;
149                      break;
150                  case VK_DOWN:
151                        g_fx=3;
152                      break;
153                  case VK_RIGHT:
154                      g_fx=0;
155                      break;
156                  case VK_LEFT:
157                       g_fx=2;
158                      break;
159 
160                 default:
161                     break;
162             }
163         break;
164 
165     case WM_MOUSEMOVE:
166         hdc = GetDC (hWnd) ;
167 
168         x = LOWORD (lParam) ;
169         y = HIWORD (lParam) ;
170 
171         if(type==1){
172 
173         BitBlt(tmp_dc,0,0,620,630,src_dc,0,0,SRCCOPY);
174         //1根线
175         MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
176         LineTo (tmp_dc,begin_x, y) ;
177 
178         //2根
179         MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
180         LineTo (tmp_dc, x, begin_y) ;
181         //3根
182         MoveToEx (tmp_dc, x, begin_y, NULL) ;
183         LineTo (tmp_dc, x, y) ;
184         //4根
185         MoveToEx (tmp_dc, begin_x,y, NULL) ;
186         LineTo (tmp_dc, x, y) ;
187 
188 
189         }
190         BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
191 
192         ReleaseDC (hWnd, hdc) ; 
193 
194         break;
195     case WM_LBUTTONDOWN:
196     
197     
198         hdc = GetDC (hWnd) ;
199             x = LOWORD (lParam) ;
200         y = HIWORD (lParam) ;
201         if(type==0){
202             begin_x=x;
203             begin_y=y;
204             src_dc=CreateCompatibleDC(hdc);
205             src_bitmap=CreateCompatibleBitmap(hdc,620,630);
206             SelectObject(src_dc,src_bitmap);
207             BitBlt(src_dc,0,0,620,630,hdc,0,0,SRCCOPY);
208 
209             type=1;
210         }
211 
212 
213      //   Rectangle(hdc, 150,150,200,200);
214 
215         if(1==type){
216             //创建临时的hdc和位图，并且把原图传过去
217             //BitBlt(hdc,0,0,620,630,src_dc,0,0,SRCCOPY);//把原hdc弄干净
218             tmp_dc=CreateCompatibleDC(hdc);
219             tmp_bitmap=CreateCompatibleBitmap(hdc,620,630);
220             SelectObject(tmp_dc,tmp_bitmap);
221             BitBlt(tmp_dc,0,0,620,630,hdc,0,0,SRCCOPY);
222 
223     
224             //MessageBox (hWnd,itoa(x,tx,10),itoa(y,ty,10),MB_OKCANCEL);*/
225 
226             MoveToEx (tmp_dc, x, y, NULL) ;
227 
228         }
229         ReleaseDC (hWnd, hdc) ;
230         break;
231 
232     case WM_LBUTTONUP:
233         hdc = GetDC (hWnd) ;
234 
235         x = LOWORD (lParam) ;
236         y = HIWORD (lParam) ;
237 
238         if(type==1){
239             //画线结束
240             LineTo (tmp_dc, x, y) ;
241             BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
242             //抠图
243             type=2;
244             t_dc=CreateCompatibleDC(hdc);
245             t_bitmap=CreateCompatibleBitmap(hdc,620,630);
246             SelectObject(t_dc,t_bitmap);
247             BitBlt(t_dc,0,0,abs(begin_x-x),abs(begin_y-y),tmp_dc, begin_x<x?begin_x:x  ,begin_y<y?begin_y:y,SRCCOPY);
248 
249             DeleteObject(tmp_dc);
250             DeleteObject(tmp_bitmap);
251             end_x=x;
252             end_y=y;
253             Rectangle(hdc, begin_x,begin_y,end_x,end_y);
254 
255             //BitBlt(hdc,x,y,abs(begin_x-x),abs(begin_y-y),t_dc, 0,0,SRCCOPY);
256 
257 
258         }
259 
260         ReleaseDC (hWnd, hdc) ;
261 
262         break;
263     case WM_CLOSE:
264         PostQuitMessage(0);
265 
266         break;
267     
268     case WM_PAINT:
269         hdc = BeginPaint (hWnd, &ps) ;
270 
271         show(hdc);
272 
273         //Rectangle(hdc, 50,50,100,100);
274         //hbitmap = CreateCompatibleBitmap (hdc, 100, 200) ;
275         //temp_hdc = CreateCompatibleDC (hdc) ;
276         //SelectObject(temp_hdc,h_back);    
277         ////Rectangle(temp_hdc, 10,10,50,50);
278     
279         //BitBlt (hdc, 0,0, 600, 600, temp_hdc, 0, 0, SRCCOPY) ;
280 
281         //xx+=20;
282         //Ellipse( hdc, xx, 300, xx+70, 340);
283 
284           EndPaint (hWnd, &ps) ;
285         break;
286 
287     case WM_TIMER:
288 
289 
290 
291         //pa();
292         if(iseat()){
293             Newapple();
294             add(-20,-20);
295         }
296         if(isziyao()||iszhuang()){
297             PostQuitMessage(0);
298         }
299 
300         hdc = GetDC (hWnd) ;
301             //show(hdc);重绘
302         /*newbrush= CreateSolidBrush(RGB(171,171,226));//椭圆更新移动
303         oldbrush=(HBRUSH)SelectObject(hdc,newbrush);
304          Rectangle( hdc, 0, 0,600,600);
305           
306         DeleteObject(newbrush);
307         SelectObject(hdc,oldbrush);
308         xx+=20;
309         Ellipse( hdc, xx, 300, xx+70, 340);
310             Rectangle(hdc, 50,50,100,100);*/
311         ReleaseDC (hWnd, hdc) ;
312         break;
313     default:
314         break;
315     }
316     //系统默认的消息处理函数
317     return DefWindowProc(hWnd,Msg,wParam,lParam);
318 }
319 
320 
321 
322  void add(int h,int l){
323       node * pnode=(node *)malloc(sizeof(node));
324       pnode->h=h;
325       pnode->l=l;
326       pnode->plast=NULL;
327       pnode->pnext=NULL;
328       if(top==NULL){
329         top=pnode;
330       }
331       else{
332           pnode->plast=end;
333           end->pnext=pnode;
334       }
335 
336       end=pnode;
337  }
338 
339 
340  void initSnake(){
341     int i;
342      for( i=8;i<=10;i++){
343          add(i,10);
344      }
345 
346  }
347 
348  void show(HDC hdc){
349     HDC temp_hdc;
350     temp_hdc = CreateCompatibleDC (hdc) ;
351     SelectObject(temp_hdc,h_back);    
352     
353     BitBlt (hdc, 0,0, 600, 600, temp_hdc, 0, 0, SRCCOPY) ;
354     DeleteObject(temp_hdc);
355     showApple( hdc);
356     showSnake( hdc);
357  }
358  void showApple(HDC hdc){
359     HDC temp_hdc;
360     temp_hdc = CreateCompatibleDC (hdc) ;
361     SelectObject(temp_hdc,h_apple);    
362     
363     BitBlt (hdc, apple.l*30+30,apple.h*30+30, 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
364     DeleteObject(temp_hdc);
365  }
366  void showSnake(HDC hdc){
367     HDC temp_hdc;
368     Snake *ptop=top;
369     temp_hdc = CreateCompatibleDC (hdc) ;
370     switch (g_fx)
371     {
372 
373     case 0:
374         SelectObject(temp_hdc,h_r);    
375         break;
376     case 1:
377         SelectObject(temp_hdc,h_u);    
378         break;
379     case 2:
380         SelectObject(temp_hdc,h_l);    
381         break;
382     case 3:
383         SelectObject(temp_hdc,h_d);    
384         break;
385     default:
386         break;
387     }
388 
389     
390     BitBlt (hdc, top->l*30+30,top->h*30+30  , 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
391     DeleteObject(temp_hdc);
392 
393     
394     temp_hdc = CreateCompatibleDC (hdc) ;
395     SelectObject(temp_hdc,h_body);    
396     ptop=ptop->pnext;
397     while(ptop){
398         
399         BitBlt (hdc, ptop->l*30+30,ptop->h*30+30  , 30, 30, temp_hdc, 0, 0, SRCCOPY) ;
400         ptop=ptop->pnext;
401     }
402     DeleteObject(temp_hdc);
403 
404  }
405 
406  void pa(){
407     Snake *jend=end;
408     while(jend->plast!=NULL)
409     {
410         jend->h=jend->plast->h;
411         jend->l=jend->plast->l;
412 
413         jend=jend->plast;
414     }
415     switch(g_fx)
416      {
417      case 0:
418          top->l++;
419          break;
420      case 1:
421          top->h--;
422          break;
423      case 2:
424          top->l--;
425          break;
426      case 3:
427          top->h++;
428          break;
429 
430      }
431  }
432  boolean iseat(){
433      if(top->h==apple.h &&top->l==apple.l )
434          return TRUE;
435      return FALSE;
436  }
437  void Newapple(){
438      apple.l=rand()%18;
439      apple.h=rand()%18;
440  }
441  boolean isziyao(){
442      Snake *pbody=top->pnext;
443      while(pbody!=NULL){
444          if(top->h==pbody->h &&top->l==pbody->l )
445              return TRUE;
446          pbody=pbody->pnext;
447      }
448     return FALSE;
449  }
450  boolean iszhuang(){
451      if(top->h>17||top->l<0||top->l>17||top->h<0)
452     {
453         return TRUE;
454     }
455      return FALSE;
456  }

View Code

之后我们便可以，把扣除去的图放在hdc中，我们可以放在WM_BUTTONUP里面，表示我们只需要放在指定的位置上，我们也可以放在WM_MOUSEMOVE里面，表示可以不同的拖拽

  1 int xx=200;
  2 HDC tmp_dc;
  3 HBITMAP tmp_bitmap;
  4 HDC src_dc;
  5 HBITMAP src_bitmap;
  6 
  7 HDC t_dc;
  8 HBITMAP t_bitmap;
  9 int type=0;
 10 int begin_x=0;
 11 int begin_y=0;
 12 int end_x;
 13 int end_y;
 14 LRESULT CALLBACK MyWndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam){
 15     int x,y;
 16 
 17 
 18 //    char tx[10];
 19     //char ty[10];
 20     HDC hdc;
 21     //temp_hdc;
 22     //HBRUSH newbrush;
 23     //HBRUSH oldbrush;
 24     PAINTSTRUCT ps;
 25 
 26 //    HBITMAP hbitmap ;
 27 
 28     switch (Msg)
 29     {
 30 
 31     case WM_KEYDOWN:
 32             switch (wParam)
 33             {
 34                  case VK_UP:
 35                       g_fx=1;
 36                      break;
 37                  case VK_DOWN:
 38                        g_fx=3;
 39                      break;
 40                  case VK_RIGHT:
 41                      g_fx=0;
 42                      break;
 43                  case VK_LEFT:
 44                       g_fx=2;
 45                      break;
 46 
 47                 default:
 48                     break;
 49             }
 50         break;
 51 
 52     case WM_MOUSEMOVE:
 53         hdc = GetDC (hWnd) ;
 54 
 55         x = LOWORD (lParam) ;
 56         y = HIWORD (lParam) ;
 57 
 58         if(type==1){
 59 
 60         BitBlt(tmp_dc,0,0,620,630,src_dc,0,0,SRCCOPY);
 61         //1根线
 62         MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
 63         LineTo (tmp_dc,begin_x, y) ;
 64 
 65         //2根
 66         MoveToEx (tmp_dc, begin_x, begin_y, NULL) ;
 67         LineTo (tmp_dc, x, begin_y) ;
 68         //3根
 69         MoveToEx (tmp_dc, x, begin_y, NULL) ;
 70         LineTo (tmp_dc, x, y) ;
 71         //4根
 72         MoveToEx (tmp_dc, begin_x,y, NULL) ;
 73         LineTo (tmp_dc, x, y) ;
 74 
 75         BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
 76         }
 77         
 78 
 79         if(type==2){
 80 
 81             BitBlt(hdc,0,0,620,630,src_dc, 0,0,SRCCOPY);
 82             Rectangle(hdc, begin_x,begin_y,end_x,end_y);
 83             BitBlt(hdc,x,y,abs(begin_x-end_x),abs(begin_y-end_y),t_dc, 0,0,SRCCOPY);
 84         }
 85 
 86         ReleaseDC (hWnd, hdc) ; 
 87 
 88         break;
 89     case WM_LBUTTONDOWN:
 90     
 91     
 92         hdc = GetDC (hWnd) ;
 93             x = LOWORD (lParam) ;
 94         y = HIWORD (lParam) ;
 95         if(type==0){
 96             begin_x=x;
 97             begin_y=y;
 98             src_dc=CreateCompatibleDC(hdc);
 99             src_bitmap=CreateCompatibleBitmap(hdc,620,630);
100             SelectObject(src_dc,src_bitmap);
101             BitBlt(src_dc,0,0,620,630,hdc,0,0,SRCCOPY);
102 
103             type=1;
104         }
105 
106 
107      //   Rectangle(hdc, 150,150,200,200);
108 
109         if(1==type){
110             //创建临时的hdc和位图，并且把原图传过去
111             //BitBlt(hdc,0,0,620,630,src_dc,0,0,SRCCOPY);//把原hdc弄干净
112             tmp_dc=CreateCompatibleDC(hdc);
113             tmp_bitmap=CreateCompatibleBitmap(hdc,620,630);
114             SelectObject(tmp_dc,tmp_bitmap);
115             BitBlt(tmp_dc,0,0,620,630,hdc,0,0,SRCCOPY);
116 
117     
118             //MessageBox (hWnd,itoa(x,tx,10),itoa(y,ty,10),MB_OKCANCEL);*/
119 
120             MoveToEx (tmp_dc, x, y, NULL) ;
121 
122         }
123         ReleaseDC (hWnd, hdc) ;
124         break;
125 
126     case WM_LBUTTONUP:
127         hdc = GetDC (hWnd) ;
128 
129         x = LOWORD (lParam) ;
130         y = HIWORD (lParam) ;
131 
132         if(type==1){
133             //画线结束
134             LineTo (tmp_dc, x, y) ;
135             BitBlt(hdc,0,0,620,630,tmp_dc,0,0,SRCCOPY);
136             //抠图
137             type=2;
138             t_dc=CreateCompatibleDC(hdc);
139             t_bitmap=CreateCompatibleBitmap(hdc,620,630);
140             SelectObject(t_dc,t_bitmap);
141             BitBlt(t_dc,0,0,abs(begin_x-x),abs(begin_y-y),tmp_dc, begin_x<x?begin_x:x  ,begin_y<y?begin_y:y,SRCCOPY);
142 
143             DeleteObject(tmp_dc);
144             DeleteObject(tmp_bitmap);
145             end_x=x;
146             end_y=y;
147             Rectangle(hdc, begin_x,begin_y,end_x,end_y);
148 
149             BitBlt(hdc,x,y,abs(begin_x-x),abs(begin_y-y),t_dc, 0,0,SRCCOPY);
150 
151 
152         }
153 
154         ReleaseDC (hWnd, hdc) ;
155 
156         break;
157     case WM_CLOSE:
158         PostQuitMessage(0);
159 
160         break;
161     
162     case WM_PAINT:
163         hdc = BeginPaint (hWnd, &ps) ;
164 
165         show(hdc);
166 
167         //Rectangle(hdc, 50,50,100,100);
168         //hbitmap = CreateCompatibleBitmap (hdc, 100, 200) ;
169         //temp_hdc = CreateCompatibleDC (hdc) ;
170         //SelectObject(temp_hdc,h_back);    
171         ////Rectangle(temp_hdc, 10,10,50,50);
172     
173         //BitBlt (hdc, 0,0, 600, 600, temp_hdc, 0, 0, SRCCOPY) ;
174 
175         //xx+=20;
176         //Ellipse( hdc, xx, 300, xx+70, 340);
177 
178           EndPaint (hWnd, &ps) ;
179         break;
180 
181     case WM_TIMER:
182 
183 
184 
185         //pa();
186         if(iseat()){
187             Newapple();
188             add(-20,-20);
189         }
190         if(isziyao()||iszhuang()){
191             PostQuitMessage(0);
192         }
193 
194         hdc = GetDC (hWnd) ;
195             //show(hdc);重绘
196         /*newbrush= CreateSolidBrush(RGB(171,171,226));//椭圆更新移动
197         oldbrush=(HBRUSH)SelectObject(hdc,newbrush);
198          Rectangle( hdc, 0, 0,600,600);
199           
200         DeleteObject(newbrush);
201         SelectObject(hdc,oldbrush);
202         xx+=20;
203         Ellipse( hdc, xx, 300, xx+70, 340);
204             Rectangle(hdc, 50,50,100,100);*/
205         ReleaseDC (hWnd, hdc) ;
206         break;
207     default:
208         break;
209     }
210     //系统默认的消息处理函数
211     return DefWindowProc(hWnd,Msg,wParam,lParam);
212 }

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原文地址：https://www.cnblogs.com/13224ACMer/p/5866978.html