自制wn32绘画太极图

sun_chuan

1. #include<windows.h>
   
2. #include<windowsx.h>
   
3. 
   
4. LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
   
5. 
   
6. int WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
   
7. {
   
8.         static TCHAR szAppName[] = TEXT("MyAppWindows");
   
9.         HWND hwnd = NULL;
   
10.         MSG msg;
    
11.         WNDCLASS wc;
    
12.         wc.style = CS_HREDRAW | CS_VREDRAW;
    
13.         wc.lpfnWndProc = WndProc;
    
14.         wc.cbClsExtra = 0;
    
15.         wc.cbWndExtra = 0;
    
16.         wc.hInstance = hInstance;
    
17.         wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    
18.         wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    
19.         wc.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    
20.         wc.lpszMenuName = NULL;
    
21.         wc.lpszClassName = szAppName;
    
22. 
    
23.         if (!RegisterClass(&wc))
    
24.         {
    
25.                 MessageBox(NULL, TEXT("Need Windows NT!!!!"), TEXT("Error"), MB_OK);
    
26.         }
    
27. 
    
28. 
    
29.         hwnd = CreateWindow(szAppName, TEXT("我的窗口"),
    
30.                 WS_OVERLAPPEDWINDOW,
    
31.                 CW_USEDEFAULT,
    
32.                 CW_USEDEFAULT,
    
33.                 CW_USEDEFAULT,
    
34.                 CW_USEDEFAULT,
    
35.                 NULL,
    
36.                 NULL,
    
37.                 hInstance,
    
38.                 NULL);
    
39. 
    
40.         ShowWindow(hwnd, iCmdShow);
    
41. 
    
42.         UpdateWindow(hwnd);
    
43. 
    
44.         while (GetMessage(&msg, NULL, 0, 0))
    
45.         {
    
46.                 TranslateMessage(&msg);
    
47.                 DispatchMessage(&msg);
    
48.         }
    
49. 
    
50.         return msg.wParam;
    
51. }
    
52. LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wparam, LPARAM lparam)
    
53. {
    
54.         HDC hdc;
    
55.         PAINTSTRUCT ps;
    
56.         RECT rect;
    
57.         static int cxClient, cyClient;//客户区宽度和高度
    
58.         static int Dbig,Rbig,Rsmall,Rmin;//太极图最大圆形的直径，半径，中间圆形的半径，最小圆形的半径
    
59.         static int xBigCenter, yBigCenter;//设置大圆的中心，是客户区中心
    
60.         static int xTopSmallCenter, yTopSmallCenter,xBottomSmallCenter,yBottomSmallCenter;//设置顶部小圆圆心和底部小圆圆心坐标
    
61.         static int xTopMinCenter, yTopMinCenter,xBottomMinCenter,yBottomMinCenter;//设置顶部和底部最小圆圆心的坐标
    
62.         switch (message)
    
63.         {
    
64.         case WM_PAINT:
    
65.                 hdc = BeginPaint(hwnd, &ps);
    
66. 
    
67.                 //画出最大圆形
    
68.                 Ellipse(hdc, xBigCenter - Rbig, yBigCenter - Rbig, xBigCenter + Rbig, yBigCenter + Rbig);
    
69. 
    
70.                 //画出上方小圆，用黑色填充
    
71.                 SelectObject(hdc, GetStockObject(BLACK_BRUSH));
    
72.                 Ellipse(hdc, xTopSmallCenter - Rsmall, yTopSmallCenter - Rsmall, xTopSmallCenter + Rsmall, yTopSmallCenter + Rsmall);
    
73. 
    
74.                 //画出左半边半圆，用黑色填充
    
75.                 Pie(hdc, xBigCenter - Rbig, yBigCenter - Rbig, xBigCenter + Rbig, yBigCenter + Rbig, xBigCenter, yBigCenter - Rbig, xBigCenter, yBigCenter + Rbig);
    
76. 
    
77.                 //画出上方最小圆,用白色填充
    
78.                 SelectObject(hdc, GetStockObject(WHITE_BRUSH));
    
79.                 Ellipse(hdc, xTopMinCenter - Rmin, yTopMinCenter - Rmin, xTopMinCenter + Rmin, yTopMinCenter + Rmin);
    
80. 
    
81.                 //画出下方小半圆
    
82.                 Pie(hdc, xBottomSmallCenter - Rsmall, yBottomSmallCenter - Rsmall, xBottomSmallCenter + Rsmall, yBottomSmallCenter + Rsmall, xBottomSmallCenter, yBottomSmallCenter - Rsmall, xBottomSmallCenter, yBottomSmallCenter + Rsmall);;
    
83.                
    
84.                 //小半圆的直径显示出来了，再贴一条白线盖住
    
85.                 for (size_t i = yBottomSmallCenter - Rsmall; i <= yBottomSmallCenter + Rsmall; i++)
    
86.                 {
    
87.                         SetPixel(hdc, xBottomSmallCenter - 1, i, RGB(255, 255, 255));//发现咋也盖不住，尝试了半天，才发现减去1就可以盖住了，有哪位大佬知道这是为什么吗？？
    
88.                 }
    
89. 
    
90.                 //画出底部最小圆，用黑色填充
    
91.                 SelectObject(hdc, GetStockObject(BLACK_BRUSH));
    
92.                 Ellipse(hdc, xBottomMinCenter - Rmin, yBottomMinCenter - Rmin, xBottomSmallCenter + Rmin, yBottomSmallCenter + Rmin);
    
93.                
    
94.                 ReleaseDC(hwnd, hdc);
    
95.                 return 0;
    
96.         case WM_SIZE:
    
97.                 cxClient = LOWORD(lparam);
    
98.                 cyClient = HIWORD(lparam);
    
99. 
    
100.                 //设置大圆圆心坐标
     
101.                 Dbig = (((cxClient > cyClient)?cyClient:cxClient));//直径是客户区短的那一边
     
102.                 Rbig = Dbig / 2;
     
103.                 Rsmall = Rbig / 2;
     
104.                 Rmin = Rsmall / 3;
     
105.                 xBigCenter = cxClient / 2;
     
106.                 yBigCenter = cyClient / 2;
     
107. 
     
108.                 //设置上方小圆圆心坐标
     
109.                 xTopSmallCenter = xBigCenter;
     
110.                 yTopSmallCenter = yBigCenter - Rbig / 2;
     
111. 
     
112.                 //设置上方最小圆圆心坐标
     
113.                 xTopMinCenter = xBigCenter;
     
114.                 yTopMinCenter = yBigCenter - Rbig / 2;
     
115. 
     
116.                 //设置下方小圆圆心坐标（应该是半圆）
     
117.                 xBottomSmallCenter = xBigCenter;
     
118.                 yBottomSmallCenter = yBigCenter + Rbig / 2;
     
119. 
     
120.                 //设置下方最小圆半径
     
121.                 xBottomMinCenter = xBigCenter;
     
122.                 yBottomMinCenter = yBigCenter + Rbig / 2;
     
123.                 return 0;
     
124.         case WM_DESTROY://接受WM_DESTROY消息并发送WM_QUIT消息
     
125.                 PostQuitMessage(0);
     
126.                 return 0;
     
127.         }
     
128. 
     
129. 
     
130.         return DefWindowProc(hwnd, message, wparam, lparam);
     
131. }
     

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