用DEVC++作圖

小海豚學NOIP，老師說要用DEV C++。

小海豚喜歡畫圖，記得以前用C#編些程序給她看。可前一陣打開看，我的免費Visual Studio過期了。可惡的Microsoft ，不想用盜版難道就要每個月就下載一次？

于是就用DEV C++的Windows調用吧。這里還有一個插曲：我搜DEV C++如何作圖，結果找到了CSDN，花4個點下了winbgim，然后才想起直接用Windows調用豈不更正宗些？如圖：

這樣就建立了名為tstdraw的工程。

 1 #include <windows.h>
 2 
 3 LRESULT CALLBACK WndProc(HWND hwnd, UINT Message, WPARAM wParam, LPARAM lParam) {
 4     static int  cxClient, cyClient ;
 5     static HPEN hPen1, hPen2, hPen3;
 6     HDC         hdc ;
 7     int         i ;
 8     PAINTSTRUCT ps ;
 9     switch(Message) {
10         case WM_SIZE: {
11             cxClient = LOWORD (lParam) ;
12             cyClient = HIWORD (lParam) ;
13             break;
14         }
15         case WM_PAINT: {
16             InvalidateRect(hwnd, NULL, TRUE);
17             hdc = BeginPaint (hwnd, &ps) ;
18             hPen1 = CreatePen(PS_SOLID, 2, 0x0000ff);
19             hPen2 = CreatePen(PS_SOLID, 4, 0xa0ff00);
20             hPen3 = CreatePen(PS_DOT, 0, 0xff00ff);
21             SelectObject(hdc, hPen1);
22             MoveToEx (hdc, 0, cyClient/2, NULL) ;
23             LineTo   (hdc, cxClient, cyClient/2) ;
24             SelectObject(hdc, hPen2);
25             Rectangle(hdc, 300, 200, 70, 80); 
26             SelectObject(hdc, hPen3);
27             Ellipse(hdc, cxClient/4, cyClient/3, cxClient/4+cxClient/3, cyClient/3+cxClient/3); 
28             SelectObject(hdc, hPen1);
29             RoundRect(hdc, 150, 160, 350, 250, 40, 20); 
30             DeleteObject(hPen1);
31             DeleteObject(hPen2);
32             DeleteObject(hPen3);
33 
34             break;
35         }
36         case WM_CLOSE: {
37             DestroyWindow(hwnd);
38             break;
39         }
40         case WM_DESTROY: {
41             PostQuitMessage(0);
42             break;
43         }
44         default:
45             return DefWindowProc(hwnd, Message, wParam, lParam);
46     }
47     return 0;
48 }
49 
50 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) {
51     WNDCLASSEX wc; 
52     HWND hwnd; 
53     MSG Msg; 
54     memset(&wc,0,sizeof(wc));
55     wc.cbSize         = sizeof(WNDCLASSEX);
56     wc.lpfnWndProc     = WndProc; 
57     wc.hInstance     = hInstance;
58     wc.hCursor         = LoadCursor(NULL, IDC_ARROW);
59     wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
60     wc.lpszClassName = "WindowClass";
61     wc.hIcon         = LoadIcon(NULL, IDI_APPLICATION); 
62     wc.hIconSm         = LoadIcon(NULL, IDI_APPLICATION);
63 
64     if(!RegisterClassEx(&wc)) {
65         MessageBox(NULL, "Window Registration Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
66         return 0;
67     }
68 
69     hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,"WindowClass","Try graphics",WS_VISIBLE|WS_OVERLAPPEDWINDOW,
70         CW_USEDEFAULT,
71         CW_USEDEFAULT,
72         640,
73         480,
74         NULL,NULL,hInstance,NULL);
75     if(hwnd == NULL) {
76         MessageBox(NULL, "Window Creation Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
77         return 0;
78     }
79     while(GetMessage(&Msg, NULL, 0, 0) > 0) { 
80         TranslateMessage(&Msg); 
81         DispatchMessage(&Msg); 
82     }
83     return Msg.wParam;
84 }

其中只有16-32行的是自己寫的，其他都是工程自動生成的。

運行結果如下（拉動了窗口，圖形的位置大小根據相對或絕對坐標改變或不變）：

轉載于:https://www.cnblogs.com/htbb/archive/2013/02/21/GraphicUsingDEVCpp.html

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