How to draw a sine curve in c ++? 1. Create a Solution #include #include #define

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How to draw a sine curve in c ++? 1. Create a

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#include #include #define screen_width 800 #define screen_height 600 #define pi 3.14159 COLORREF blue = RGB(0, 0, 255); double _freq = 50; int _sTime = 5, _amp = 100; LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam); void wavefunc(HWND, HDC); int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { HWND hWnd; WNDCLASSEX wc; HDC hDC; ZeroMemory(&wc, sizeof(WNDCLASSEX)); wc.cbSize = sizeof(WNDCLASSEX); wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = WindowProc; wc.hInstance = hInstance; wc.hCursor = LoadCursor(NULL, IDC_ARROW); wc.hIcon = (HICON)LoadImage(NULL, "C:\Visual Studio 2010\Icons\Smiley.ico", IMAGE_ICON, 0, 0, LR_LOADFROMFILE); wc.lpszClassName = "SineWave"; RegisterClassEx(&wc); hWnd = CreateWindowEx(NULL, "SineWave", "Wave", WS_SYSMENU, 0, 45, screen_width, screen_height, NULL, NULL, hInstance, NULL); ShowWindow(hWnd, nCmdShow); hDC = GetDC(hWnd); MSG msg; while(TRUE) { while(PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {DispatchMessage(&msg);} if(msg.message == WM_QUIT) break; wavefunc(hWnd, hDC); } return msg.wParam; } LRESULT CALLBACK WindowProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { switch(message) { case WM_DESTROY: { PostQuitMessage(0); return 0; } break; case WM_KEYDOWN: { switch (wParam) { case VK_NUMPAD4: _freq--; if(_freq < 1.0) _freq = 1; break; case VK_NUMPAD6: _freq++; break; case VK_NUMPAD8: _amp++; if(_amp > 200) _amp = 200; break; case VK_NUMPAD2: _amp--; if(_amp < 0) _amp = 0; break; case VK_SUBTRACT: _sTime++; if(_sTime > 50) _sTime = 50; break; case VK_ADD: _sTime--; if(_sTime < 0) _sTime = 0; break; } return 0; } break; } return DefWindowProc(hWnd, message, wParam, lParam); } void wavefunc(HWND hWnd, HDC hDC) { double full = 2 * pi * _freq; static double _x = 0; int _y = (sin(_x/_freq)*_amp) + 300; if (_x >= full) _x -= full; SetPixel(hDC, 600, _y, blue); ScrollWindow(hWnd, -1, 0, NULL, NULL); Sleep(_sTime); _x++; }

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