GDI/图象编程

开发平台：
Visual C++

DEMO3_4.C：源码内容
							  1 /****************************************************************/
  2 /*         Demo3_4   ---  The test of ISOTROPIC MapMode         */
  3 /****************************************************************/
  4 
  5 #include <windows.h>
  6 #include <math.h>
  7 #include "demo3_4.h"
  8 
  9 int  PASCAL  WinMain(HANDLE, HANDLE, LPSTR, int);
 10 long FAR PASCAL MainWndProc(HWND, unsigned, WORD, LONG);
 11 
 12 void DrawGraph(HDC, int, int, POINT);
 13 void DrawResult(HDC, int, int, int, POINT);
 14 
 15 
 16 /****************************************************************/
 17 /*                      WinMain()                               */
 18 /****************************************************************/
 19 
 20 int PASCAL WinMain(HANDLE hInstance, HANDLE hPrevInstance,
 21                    LPSTR lpszCmdLine, int nCmdShow)
 22 {
 23    WNDCLASS wclass;
 24    MSG      msg;
 25    HWND     hWnd;
 26    char     szName[] = "Demo3_4";
 27 
 28    if (!hPrevInstance)
 29     {
 30         wclass.style         = CS_HREDRAW | CS_VREDRAW;
 31         wclass.lpfnWndProc   = MainWndProc;
 32         wclass.cbClsExtra    = 0;
 33         wclass.cbWndExtra    = 0;
 34         wclass.hInstance     = hInstance;
 35         wclass.hIcon         = LoadIcon(NULL, IDI_APPLICATION);
 36         wclass.hCursor       = LoadCursor(NULL, IDC_ARROW);
 37         wclass.hbrBackground = GetStockObject(WHITE_BRUSH);
 38         wclass.lpszMenuName  = szName;
 39         wclass.lpszClassName = szName;
 40 
 41         if (!RegisterClass (&wclass))
 42            return (FALSE);
 43     }
 44 
 45     hWnd = CreateWindow(
 46                 szName,
 47                 "Curve Operation" ,
 48                 WS_OVERLAPPEDWINDOW,
 49                 CW_USEDEFAULT,
 50                 CW_USEDEFAULT,
 51                 CW_USEDEFAULT,
 52                 CW_USEDEFAULT,
 53                 NULL,
 54                 NULL,
 55                 hInstance,
 56                 NULL );
 57 
 58     if (!hWnd)
 59         return (FALSE);
 60 
 61     ShowWindow(hWnd, nCmdShow);
 62     UpdateWindow(hWnd);
 63 
 64     while (GetMessage(&msg, NULL, NULL,NULL))
 65        {
 66            TranslateMessage(&msg);
 67            DispatchMessage(&msg);
 68        }
 69     return (msg.wParam);
 70 }
 71 
 72 
 73 
 74 /****************************************************************/
 75 /*                      MainWndProc()                           */
 76 /****************************************************************/
 77 
 78 long FAR PASCAL MainWndProc(HWND hWnd, unsigned message,
 79                             WORD wParam, LONG lParam)
 80 {
 81    HDC           hDC;
 82    HMENU         hMenu;
 83    PAINTSTRUCT   ps;
 84    static int    GraphID_1 = IDM_SIN1;
 85    static int    GraphID_2 = IDM_COS2;
 86    static int    OpID = IDM_ADD;
 87    RECT          Rect;
 88    static RECT   Rect1, Rect2, Rect3;
 89    static POINT  Client;
 90    BOOL          GraphChange  = FALSE;
 91    BOOL          ResultChange = FALSE;
 92 
 93    switch (message)
 94     {
 95       case WM_CREATE :
 96                 hMenu = GetMenu(hWnd);
 97                 CheckMenuItem(hMenu, IDM_SIN1, MF_CHECKED);
 98                 CheckMenuItem(hMenu, IDM_COS2, MF_CHECKED);
 99                 CheckMenuItem(hMenu, IDM_ADD,  MF_CHECKED);
100                 return (0);
101 
102       case WM_COMMAND :
103                 hMenu = GetMenu(hWnd);
104                 switch (wParam)
105                   {
106                     case IDM_SIN1 :
107                     case IDM_COS1 :
108 
109                          if (GraphID_1 == wParam)
110                             return (0);
111 
112                          CheckMenuItem(hMenu, GraphID_1,
113                                         MF_UNCHECKED);
114                          GraphID_1 = wParam;
115                          CheckMenuItem(hMenu, GraphID_1,
116                                         MF_CHECKED);
117 
118                          InvalidateRect(hWnd, &Rect1, TRUE);
119                          break;
120 
121                     case IDM_SIN2 :
122                     case IDM_COS2 :
123 
124                          if (GraphID_2 == wParam)
125                             return (0);
126 
127                          CheckMenuItem(hMenu, GraphID_2,
128                                         MF_UNCHECKED);
129                          GraphID_2 = wParam;
130                          CheckMenuItem(hMenu, GraphID_2,
131                                         MF_CHECKED);
132 
133                          InvalidateRect(hWnd, &Rect2, TRUE);
134                          break;
135 
136                     case IDM_ADD  :
137                     case IDM_SUB1 :
138                     case IDM_SUB2 :
139 
140                          if (OpID == wParam)
141                             return (0);
142 
143                          CheckMenuItem(hMenu, OpID,
144                                         MF_UNCHECKED);
145                          OpID = wParam;
146                          CheckMenuItem(hMenu, OpID,
147                                         MF_CHECKED);
148 
149                          InvalidateRect(hWnd, &Rect3, TRUE);
150                          break;
151                   }
152                 return (0);
153 
154       case WM_SIZE :
155 
156                 Client.x = LOWORD(lParam);
157                 Client.y = HIWORD(lParam);
158 
159                 Rect1.left = 0;
160                 Rect1.top  = 0;
161                 Rect1.right  = Client.x/2;
162                 Rect1.bottom = Client.y/2;
163 
164                 Rect2.left = 0;
165                 Rect2.top  = Client.y/2;
166                 Rect2.right  = Client.x/2;
167                 Rect2.bottom = Client.y;
168 
169                 Rect3.left = Client.x/2;
170                 Rect3.top  = 0;
171                 Rect3.right  = Client.x;
172                 Rect3.bottom = Client.y;
173 
174                 return (0);
175 
176       case WM_PAINT :
177                 hDC = BeginPaint(hWnd, &ps);
178 
179                 SetMapMode(hDC, MM_ISOTROPIC);
180 
181                 SetWindowExt(hDC, 628, 628);
182                 SetViewportExt(hDC, Client.x, -Client.y);
183 
184                 /*      Draw the Graph 1      */
185                 IntersectRect(&Rect, &Rect1, &ps.rcPaint);
186                 if (! IsRectEmpty(&Rect))
187                    {
188                       DrawGraph(hDC, 1, GraphID_1, Client);
189                       GraphChange = TRUE;
190                    }
191 
192                 /*      Draw the Graph 2      */
193                 IntersectRect(&Rect, &Rect2, &ps.rcPaint);
194                 if (! IsRectEmpty(&Rect))
195                    {
196                       DrawGraph(hDC, 2, GraphID_2, Client);
197                       GraphChange = TRUE;
198                    }
199 
200                 /*      Draw the result of    */
201                 /*       Graph1 op Graph2     */
202                 IntersectRect(&Rect, &Rect3, &ps.rcPaint);
203                 if (! IsRectEmpty(&Rect))
204                    {  DrawResult(hDC, GraphID_1, GraphID_2,
205                                  OpID, Client);
206                       ResultChange = TRUE;
207                    }
208 
209                 EndPaint(hWnd, &ps);
210                 if (GraphChange && !ResultChange)
211                    InvalidateRect(hWnd, &Rect3, TRUE);
212                 return (0);
213 
214       case WM_DESTROY :
215                 PostQuitMessage(0);
216                 return (0);
217 
218       default :
219                 return(DefWindowProc(hWnd, message, wParam, lParam));
220     }
221 }
222 
223 
224 
225 void DrawGraph(HDC hDC, int Index, int GraphID, POINT Client)
226 {
227    int    i;
228    DWORD  rgbColor;
229    double Rad;
230    int    Val;
231    int    Width;
232 
233    SaveDC(hDC);
234 
235    if (Client.x < Client.y)
236       Width = Client.x;
237    else
238       Width = Client.y;
239 
240    if (Index == 1)
241       SetViewportOrg(hDC, Client.x/2-Width/4, Client.y/2-Width/4);
242    else
243       SetViewportOrg(hDC, Client.x/2-Width/4, Client.y/2+Width/4);
244 
245    MoveTo(hDC, -628/6, 0);
246    LineTo(hDC,  628/6, 0);
247    MoveTo(hDC, 0, -628/6);
248    LineTo(hDC, 0,  628/6);
249 
250    rgbColor = RGB(0, 0, 0);
251    if (GraphID == IDM_SIN1 || GraphID == IDM_SIN2)
252      {
253        for (i=-628; i<=628; i++)
254         {
255           Rad = (double) i/100;
256           Val = sin(Rad)*100;
257           SetPixel(hDC, i/6, Val, rgbColor);
258         }
259      }
260    else
261      {
262        for (i=-628; i<=628; i++)
263         {
264           Rad = (double) i/100;
265           Val = cos(Rad)*100;
266           SetPixel(hDC, i/6, Val, rgbColor);
267         }
268      }
269 
270    RestoreDC(hDC, -1);
271 }
272 
273 
274 
275 void DrawResult(HDC hDC, int GraphID_1, int GraphID_2,
276                 int OpID, POINT Client)
277 {
278    int    i;
279    DWORD  rgbColor;
280    double Rad;
281    int    Val;
282    double (*Func1)(double), (*Func2)(double);
283    int    Index1, Index2;
284    int    Width;
285 
286    SaveDC(hDC);
287 
288    if (Client.x < Client.y)
289       Width = Client.x;
290    else
291       Width = Client.y;
292 
293    SetViewportOrg(hDC, Client.x/2+Width/4, Client.y/2);
294 
295    MoveTo(hDC, -628/6, 0);
296    LineTo(hDC,  628/6, 0);
297    MoveTo(hDC, 0, -628/3);
298    LineTo(hDC, 0,  628/3);
299 
300    if (GraphID_1 == IDM_SIN1)
301       Func1 = sin;
302    else
303       Func1 = cos;
304 
305    if (GraphID_2 == IDM_SIN2)
306       Func2 = sin;
307    else
308       Func2 = cos;
309 
310    rgbColor = RGB(0, 0, 0);
311 
312    switch (OpID)
313      {
314        case IDM_ADD :
315               for (i=-628; i<=628; i++)
316                 {
317                   Rad = (double) i/100;
318                   Val = (Func1(Rad) + Func2(Rad)) * 100;
319                   SetPixel(hDC, i/6, Val, rgbColor);
320                 }
321               break;
322 
323        case IDM_SUB1 :
324               for (i=-628; i<=628; i++)
325                 {
326                   Rad = (double) i/100;
327                   Val = (Func1(Rad) - Func2(Rad)) * 100;
328                   SetPixel(hDC, i/6, Val, rgbColor);
329                 }
330               break;
331 
332        case IDM_SUB2 :
333               for (i=-628; i<=628; i++)
334                 {
335                   Rad = (double) i/100;
336                   Val = (Func2(Rad) - Func1(Rad)) * 100;
337                   SetPixel(hDC, i/6, Val, rgbColor);
338                 }
339               break;
340      }
341 
342    RestoreDC(hDC, -1);
343 }
344 

						