Windows编程 - 正弦曲线

#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";

// 注册窗口类

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);

// 创建并线程主窗口

HWND hWnd = ::CreateWindowEx(

WS_EX_CLIENTEDGE, // 扩展样式

szWindowClass, // 类名

"正弦线", // 标题

WS_OVERLAPPEDWINDOW, // 窗口样式

CW_USEDEFAULT, // 初始 X 坐标

CW_USEDEFAULT, // 宽度

CW_USEDEFAULT, // 高度

NULL, // 父窗口句柄

NULL, // 菜单句柄

hInstance, // 程序实例句柄

NULL);

::ShowWindow(hWnd, nShowCmd);

::UpdateWindow(hWnd);

// 进入消息循环

MSG msg;

while(::GetMessage(&msg, NULL, 0, 0))

{

::TranslateMessage(&msg);

::DispatchMessage(&msg);

}

return 1;

}

// 消息处理函数 // 03SineWave工程下

LRESULT __stdcall WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

{

#define SEGMENTS 500 // 取的点数（在一个周期内取500个点）

#define PI 3.1415926 // 圆周率

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;

// 画横坐标轴

::MoveToEx(hdc, 0, cyClient/2, NULL);

::LineTo(hdc, cxClient, cyClient/2);

// 找出500个点的坐标

for(i=0; i<SEGMENTS; i++)

{

pt[i].x = cxClient*i/SEGMENTS;

pt[i].y = (int)((cyClient/2)*(1 - sin(2*PI*i/SEGMENTS)));

}

// 将各点连在一起

::Polyline(hdc, pt, SEGMENTS);

::EndPaint(hWnd, &ps);

break;

case WM_DESTROY:

::PostQuitMessage(0);

break;

}

return ::DefWindowProc(hWnd, message, wParam, lParam);

}

来源：https://www.cnblogs.com/answeryi/archive/2009/07/12/1522101.html

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正弦曲线