用c语言画出美丽的函数 c语言函数画图

用c语言画一个2次函数图像

#include windows.h

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,

PSTR szCmdLine, int iCmdShow)

{

static TCHAR szAppName[]=TEXT("二次函数");

HWND         hwnd;

MSG       空滚   msg;

WNDCLASS     wndclass;

wndclass.style=CS_HREDRAW|CS_VREDRAW;

wndclass.lpfnWndProc=WndProc;

wndclass.cbClsExtra=0;

wndclass.cbWndExtra=0;

wndclass.hInstance=hInstance;

wndclass.hIcon=LoadIcon(NULL, IDI_APPLICATION);

wndclass.hCursor=LoadCursor(NULL, IDC_ARROW);

wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);

wndclass.lpszMenuName=NULL;

wndclass.lpszClassName=szAppName;

if (!RegisterClass(wndclass))

{

MessageBox(NULL, TEXT("Error"),

szAppName, 或衫MB_ICONERROR);

return 0;

}

hwnd=CreateWindow(szAppName, TEXT("二次函数"),

WS_OVERLAPPEDWINDOW,

CW_USEDEFAULT, CW_USEDEFAULT,

CW_USEDEFAULT, CW_USEDEFAULT,

NULL, NULL, hInstance, NULL);

ShowWindow(hwnd, iCmdShow);

UpdateWindow(hwnd);

while (GetMessage(msg, NULL, 0, 0))

{

TranslateMessage(msg);

DispatchMessage(msg);

}

return msg.wParam;

}

LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)

{

static int  cxClient, cyClient;

const static int n=1000;

HDC         hdc;

int         i;

PAINTSTRUCT ps;

POINT       apt[n];

switch (message)

{

case WM_SIZE:

cxClient=LOWORD(lParam);

cyClient=HIWORD(lParam);

return 0;

case WM_PAINT:

hdc=BeginPaint(hwnd, ps);

MoveToEx(hdc, 0, 衫亏腔cyClient/2, NULL);

LineTo(hdc, cxClient, cyClient/2);

MoveToEx(hdc, cxClient/2, 0, NULL);

LineTo(hdc, cxClient/2, cyClient);

for (i=0;  i  n; ++i)

{

apt[i].x=cxClient/4+i; apt[i].y=cyClient-(cyClient/2-i)*(cyClient/2-i)/300-cyClient/2+100;

}

Polyline(hdc, apt, n);

return 0;

case WM_DESTROY:

PostQuitMessage(0);

return 0;

}

return DefWindowProc(hwnd, message, wParam, lParam);

}

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