Windows程序設計——畫圓

代碼如下：

#include<windows.h>
#include<stdlib.h>
#include<string.h>
long WINAPI WndProc
(
HWND hWnd,
UINT iMessage,
UINT wParam,
LONG lParam
);
BOOL InitWindowsClass(HINSTANCE hInstance);
BOOL InitWindows(HINSTANCE hInstance,int nCmdShow);
HWND hWndMain;
int WINAPI WinMain                //主函數
( HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{    MSG Message;
if(!InitWindowsClass(hInstance))        return FALSE;
if(!InitWindows(hInstance,nCmdShow))    return FALSE;
while(GetMessage(&Message,0,0,0))    //消息循環
{   
TranslateMessage(&Message);
DispatchMessage(&Message);
}
return Message.wParam;
}
long WINAPI WndProc(HWND hWnd,UINT iMessage,
UINT wParam,LONG lParam) {
HDC hDC;          //定義指向設備的句柄
HBRUSH hBrush;      //定義指向畫刷的句柄
HPEN hPen;        //定義指向畫筆的句柄
PAINTSTRUCT PtStr;//定義指向包含繪圖信息的結構體變量
switch(iMessage)                      //處理消息
{case WM_PAINT:                    //處理繪圖消息
hDC=BeginPaint(hWnd,&PtStr);
SetMapMode(hDC,MM_ANISOTROPIC);      //設置映像模式
hPen=(HPEN)GetStockObject(BLACK_PEN);    //黑色畫筆
hBrush=(HBRUSH)GetStockObject(DKGRAY_BRUSH); //畫刷
SelectObject(hDC,hBrush);  //選擇畫刷
SelectObject(hDC,hPen);      //選擇畫筆
RoundRect(hDC,50,120,100,200,15,15); //繪製圓角矩形
hBrush=(HBRUSH)GetStockObject(LTGRAY_BRUSH);  //採用亮灰色畫刷
SelectObject(hDC,hBrush);        //選擇畫刷
Ellipse(hDC,150,50,200,150);       //繪製橢圓
hBrush=(HBRUSH)GetStockObject(HOLLOW_BRUSH); //虛畫刷
SelectObject(hDC,hBrush);        //選擇畫刷
Pie(hDC,250,50,300,100,250,50,300,50);      //繪製餅形
EndPaint(hWnd,&PtStr);      //結束繪圖
return 0;
case WM_DESTROY:                 //結束應用程序
PostQuitMessage(0);    return 0;
default:                    //其他消息處理程序
return(DefWindowProc(hWnd,iMessage,wParam,lParam)) ;
}
}
BOOL InitWindows(HINSTANCE hInstance,int nCmdShow)//初始化窗口
{    HWND hWnd;
hWnd=CreateWindow("WinFill",  //生成窗口
"填充示例程序",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
0,
CW_USEDEFAULT,
0,
NULL,
NULL,
hInstance,
NULL);
if(!hWnd)    return FALSE;
hWndMain=hWnd;
ShowWindow(hWnd,nCmdShow);    //顯示窗口
UpdateWindow(hWnd);
return TRUE;
}
BOOL InitWindowsClass(HINSTANCE hInstance)    //定義窗口類
{
WNDCLASS WndClass;
WndClass.cbClsExtra=0;
WndClass.cbWndExtra=0;
WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH));
WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
WndClass.hIcon=LoadIcon(NULL,"END");
WndClass.hInstance=hInstance;
WndClass.lpfnWndProc=WndProc;
WndClass.lpszClassName="WinFill";
WndClass.lpszMenuName=NULL;
WndClass.style=CS_HREDRAW|CS_VREDRAW;
return RegisterClass(&WndClass);
WndClass.hIcon=LoadIcon(NULL,"END");
WndClass.hInstance=hInstance;
WndClass.lpfnWndProc=WndProc;
WndClass.lpszClassName="WinFill";
WndClass.lpszMenuName=NULL;
WndClass.style=CS_HREDRAW|CS_VREDRAW;
return RegisterClass(&WndClass);
}