///
// SineWave.cpp文件




#include <windows.h>
#include <math.h>


LRESULT __stdcall WndProc(HWND, UINT, WPARAM, LPARAM);


int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
char szWindowClass[] = "SineWave";


// 注冊窗口類
WNDCLASSEX wcex;


wcex.cbSize = sizeof(WNDCLASSEX);?
wcex.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)::GetStockObject(WHITE_BRUSH);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = NULL;


::RegisterClassEx(&wcex);




// 創建并線程主窗口
HWND hWnd = ::CreateWindowEx(?
WS_EX_CLIENTEDGE, // 擴展樣式
szWindowClass, // 類名
"正弦線", // 標題
WS_OVERLAPPEDWINDOW, // 窗口樣式
CW_USEDEFAULT, // 初始 X 坐標
CW_USEDEFAULT, // 初始 X 坐標
CW_USEDEFAULT, // 寬度
CW_USEDEFAULT, // 高度
NULL, // 父窗口句柄
NULL, ? ? ? ?// 菜單句柄
hInstance, // 程序實例句柄
NULL);


::ShowWindow(hWnd, nShowCmd);
::UpdateWindow(hWnd);


// 進入消息循環
MSG msg;
while(::GetMessage(&msg, NULL, 0, 0))
{
::TranslateMessage(&msg);
::DispatchMessage(&msg);?
}




return 1;
}




// 消息處理函數 ? ?// 03SineWave工程下
LRESULT __stdcall WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
#define SEGMENTS 500 ?// 取的點數（在一個周期內取500個點）
#define PI 3.1415926 ?// 圓周率


HDC hdc;
PAINTSTRUCT ps;
RECT rt;
int cxClient, cyClient;
POINT pt[SEGMENTS];
int i;

switch(message)
{
case WM_PAINT:
hdc = ::BeginPaint(hWnd, &ps);
::GetClientRect(hWnd, &rt);
cxClient = rt.right - rt.left;
cyClient = rt.bottom - rt.top;


// 畫橫坐標軸
::MoveToEx(hdc, 0, cyClient/2, NULL);
::LineTo(hdc, cxClient, cyClient/2);
// 找出500個點的坐標
for(i=0; i<SEGMENTS; i++)
{
pt[i].x = cxClient*i/SEGMENTS;
pt[i].y = (int)((cyClient/2)*(1 - sin(2*PI*i/SEGMENTS)));
}
// 將各點連在一起
::Polyline(hdc, pt, SEGMENTS);


::EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
::PostQuitMessage(0);
break;
}
return ::DefWindowProc(hWnd, message, wParam, lParam);
}

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