用c語言畫一個2次函數(shù)圖像

#include?windows.h

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

int?WINAPI?WinMain(HINSTANCE?hInstance,?HINSTANCE?hPrevInstance,

PSTR?szCmdLine,?int?iCmdShow)

{

static?TCHAR?szAppName[]=TEXT("二次函數(shù)");

HWND?????????hwnd;

MSG???????空滾???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("二次函數(shù)"),

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,?衫虧腔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);

}