1 /*************************** 2 * 3 * 程序名称 ： 模拟正弦波 4 * 作 者 ： doodle777 5 * 版 本 ： 1.1 6 * 日 期 ： 2012-10-19 7 * 说 明 ： 1.1--解决了闪屏问题 8 * 9 ***************************/ 10 11 #include<Windows.h> 12 #include<math.h> 13 14 #define NUM 1000 15 #define PI 3.14159 16 17 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM) ; 18 void Draw(HWND, float, float) ; 19 20 static int cxClient, cyClient, xOffset, yOffset; 21 POINT apt[NUM] ; 22 static int A = 1000 ; 23 static float w = 20, g = 0 ; 24 25 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) 26 { 27 static TCHAR szAppName[] = TEXT("模拟正弦波") ; 28 HWND hwnd ; 29 MSG msg ; 30 WNDCLASS wndclass ; 31 32 wndclass.cbClsExtra = NULL ; 33 wndclass.cbWndExtra = NULL ; 34 wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH) ; 35 wndclass.hCursor = LoadCursor(NULL, IDC_ARROW) ; 36 wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION) ; 37 wndclass.hInstance = hInstance ; 38 wndclass.lpfnWndProc = WndProc ; 39 wndclass.lpszClassName = szAppName ; 40 wndclass.lpszMenuName = NULL ; 41 wndclass.style = CS_HREDRAW | CS_VREDRAW ; 42 43 if(!RegisterClass(&wndclass)) 44 { 45 MessageBox(NULL, TEXT("This Program Requires Windows NT !"), szAppName, MB_ICONERROR) ; 46 return 0 ; 47 } 48 49 hwnd = CreateWindow(szAppName, TEXT("模拟正弦波(上下左右控制)"), WS_OVERLAPPEDWINDOW, 50 CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT,CW_USEDEFAULT, 51 NULL, NULL, hInstance, NULL) ; 52 ShowWindow(hwnd, iCmdShow) ; 53 UpdateWindow(hwnd) ; 54 55 while(TRUE) 56 { 57 if(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) 58 { 59 if(msg.message == WM_QUIT) 60 break ; 61 TranslateMessage(&msg) ; 62 DispatchMessage(&msg) ; 63 } 64 else 65 { 66 Draw(hwnd, w, g) ; 67 // w += 1 ; 68 // g += PI / 6 ; 69 70 } 71 } 72 return msg.wParam ; 73 } 74 75 LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) 76 { 77 RECT rect ; 78 79 rect.bottom = cyClient ; 80 rect.left = 0 ; 81 rect.right = cxClient ; 82 rect.top = 0 ; 83 84 switch(message) 85 { 86 case WM_SIZE : 87 cxClient = LOWORD(lParam) ; 88 cyClient = HIWORD(lParam) ; 89 xOffset = cxClient / 2 ; 90 yOffset = cyClient / 2 ; 91 A = cyClient / 2 ; 92 93 return 0 ; 94 95 case WM_KEYDOWN : 96 InvalidateRect(hwnd, &rect, TRUE) ; 97 switch(wParam) 98 { 99 case VK_UP : 100 g += PI / 6 ; 101 break ; 102 case VK_DOWN : 103 g -= PI / 6 ; 104 break ; 105 case VK_LEFT : 106 w -= 1 ; 107 break ; 108 case VK_RIGHT : 109 w += 1 ; 110 break ; 111 } 112 return 0 ; 113 114 115 case WM_DESTROY : 116 PostQuitMessage(0) ; 117 return 0 ; 118 } 119 return DefWindowProc(hwnd, message, wParam, lParam) ; 120 } 121 122 void Draw(HWND hwnd, float w, float g) 123 { 124 HDC hdc ; 125 PAINTSTRUCT ps ; 126 int t ; 127 128 hdc = GetDC(hwnd) ; 129 130 MoveToEx(hdc, 0, yOffset, NULL) ; 131 LineTo(hdc, cxClient, yOffset) ; 132 MoveToEx(hdc, xOffset, 0, NULL) ; 133 LineTo(hdc, xOffset, cyClient) ; 134 135 apt[0].x = 0 ; 136 apt[0].y = yOffset + A * sin(g) ; 137 MoveToEx(hdc, apt[0].x, apt[0].y, NULL) ; 138 for(t = 1; t < NUM ; t++) 139 { 140 apt[t].x = cxClient * t / NUM ; 141 apt[t].y = yOffset + A * sin(w * t / NUM + g ) ; 142 LineTo(hdc, apt[t].x, apt[t].y) ; 143 MoveToEx(hdc, apt[t].x, apt[t].y, NULL) ; 144 } 145 146 ReleaseDC(hwnd, hdc) ; 147 }