Windows程序设计——画圆[通俗易懂]

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代码如下：

#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                //主函数
(
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))    //消息循环
{ 

TranslateMessage(&Message);
DispatchMessage(&Message);
}
return Message.wParam;
}
long WINAPI WndProc(HWND hWnd, UINT iMessage,
UINT wParam, LONG lParam) { 

HDC hDC;          //定义指向设备的句柄
HBRUSH hBrush;      //定义指向画刷的句柄
HPEN hPen;        //定义指向画笔的句柄
PAINTSTRUCT PtStr;//定义指向包含绘图信息的结构体变量
switch (iMessage)                      //处理消息
{ 

case WM_PAINT:                    //处理绘图消息
hDC = BeginPaint(hWnd, &PtStr);
SetMapMode(hDC, MM_ANISOTROPIC);      //设置映像模式
hPen = (HPEN)GetStockObject(BLACK_PEN);    //黑色画笔
hBrush = (HBRUSH)GetStockObject(DKGRAY_BRUSH); //画刷
SelectObject(hDC, hBrush);  //选择画刷
SelectObject(hDC, hPen);      //选择画笔
RoundRect(hDC, 50, 120, 100, 200, 15, 15); //绘制圆角矩形
hBrush = (HBRUSH)GetStockObject(LTGRAY_BRUSH);  //采用亮灰色画刷
SelectObject(hDC, hBrush);        //选择画刷
Ellipse(hDC, 150, 50, 200, 150);       //绘制椭圆
hBrush = (HBRUSH)GetStockObject(HOLLOW_BRUSH); //虚画刷
SelectObject(hDC, hBrush);        //选择画刷
Pie(hDC, 250, 50, 300, 100, 250, 50, 300, 50);      //绘制饼形
EndPaint(hWnd, &PtStr);      //结束绘图
return 0;
case WM_DESTROY:                 //结束应用程序
PostQuitMessage(0);    return 0;
default:                    //其他消息处理程序
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);    //显示窗口
UpdateWindow(hWnd);
return TRUE;
}
BOOL InitWindowsClass(HINSTANCE hInstance)    //定义窗口类
{ 

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);
}