正弦曲线

pwnmelife

1. #include <Windows.h>
   
2. #include <strsafe.h>
   
3. #include "SysMets.h"
   
4. #include <math.h>
   
5. 
   
6. #define NUM 1000
   
7. #define TWOPI (2 * 3.14159)
   
8. LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
   
9. 
   
10. 
    
11. int WINAPI WinMain(HINSTANCE hInstance,
    
12.         HINSTANCE hPrevInstance,
    
13.         LPSTR lpCmdLine,
    
14.         int nShowCmd) {
    
15.         static TCHAR szAppName[] = TEXT("Bill");
    
16.         HWND hwnd;
    
17.         WNDCLASS wndclass;
    
18.         MSG msg;
    
19.        
    
20.         wndclass.cbClsExtra = 0;
    
21.         wndclass.cbWndExtra = 0;
    
22. 
    
23.         wndclass.hInstance = hInstance;
    
24.         wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    
25.         wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
    
26.         wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    
27.         wndclass.lpszClassName = szAppName;
    
28.         wndclass.lpszMenuName = NULL;
    
29.         wndclass.lpfnWndProc = WndProc;
    
30.         wndclass.style = CS_HREDRAW | CS_VREDRAW;
    
31. 
    
32.         RegisterClass(&wndclass);
    
33.         hwnd = CreateWindow(TEXT("Bill"), TEXT("Tip"), WS_OVERLAPPEDWINDOW | WS_HSCROLL | WS_VSCROLL,
    
34.                 CW_USEDEFAULT, 40, CW_USEDEFAULT, 100,
    
35.                 NULL, NULL, hInstance, NULL);
    
36. 
    
37.         ShowWindow(hwnd, nShowCmd);
    
38.         UpdateWindow(hwnd);
    
39.         while (GetMessage(&msg, NULL, 0, 0)) {
    
40.                 TranslateMessage(&msg);
    
41.                 DispatchMessage(&msg);
    
42.         }
    
43.         return 0;
    
44. 
    
45. }
    
46. 
    
47. LRESULT CALLBACK WndProc(HWND hwnd, UINT message,
    
48.         WPARAM wParam, LPARAM lParam) {
    
49.         HDC hdc;
    
50.         static int cxClient, cyClient;
    
51.         int i;
    
52.         PAINTSTRUCT ps;
    
53.         POINT apt[NUM];
    
54.        
    
55.         switch (message) {
    
56.         case WM_CREATE:
    
57.                 return 0;
    
58.         case WM_PAINT:
    
59.                 hdc = BeginPaint(hwnd, &ps);
    
60.                 MoveToEx(hdc, 0, cyClient/2, NULL);
    
61.                 LineTo(hdc, cxClient, cyClient / 2); //画一条直线
    
62.                 for (i = 0; i < NUM; i++) {
    
63.                         apt[i].x = i * cxClient / NUM;
    
64.                         apt[i].y = (int)(cyClient / 2 * (1 - sin(TWOPI * i / NUM))); // (y/2 (1 - sin(2π(x/NUM))))
    
65.                 }
    
66.                 Polyline(hdc, apt, NUM);
    
67.                 EndPaint(hwnd, &ps);
    
68.                 return 0;
    
69.         case WM_SIZE:
    
70.                 cxClient = LOWORD(lParam);
    
71.                 cyClient = HIWORD(lParam);
    
72.                 return 0;
    
73.         case WM_DESTROY:
    
74.                 PostQuitMessage(0);
    
75.                 return 0;
    
76.         default:
    
77.                 return DefWindowProc(hwnd, message, wParam, lParam);
    
78.         }
    
79. }

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