Visual-C++课后习题参考答案

1、4-5参考答案：#include #include #include #include #define Pi 3.1415926long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam);/ 消息处理函数声明.BOOL InitWindowsClass(HINSTANCE hInstance);/ 初始化窗口类声明BOOL InitWindows(HINSTANCE hInstance, int nCmdShow);/初始化窗口声明.HWND hWndMain;int WINAPI WinMain(HINSTANCE

2、 hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)/主函数MSG Message;if(!InitWindowsClass(hInstance)/ 初始化窗口类.return FALSE;if(!InitWindows(hInstance,nCmdShow)/初始化窗口.return FALSE;while(GetMessage(&Message,0,0,0)TranslateMessage(&Message);/消息循环.DispatchMessage(&Message);return Message.wParam

3、;long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam)/消息处理函数.HDC hDC;/ 定义设备环境句柄.HBRUSH hBrush;/ 定义画刷句柄HPEN hPen;/ 定义画笔句柄PAINTSTRUCT PtStr;/ 定义包含绘图信息的结构体变量double dfRadious0=100.0,dfRadious1;/定义外部和内部正五边形外接圆半径POINT lpOuterPoints5,lpInnerPoints5;/定义外 ,内正五边形点结构数组.POINT lpTriangle3;/ 定义三角形

4、点结构数组.dfRadious1=dfRadious0*sin(0.1*Pi)/sin(126.0/180*Pi);/根据外圆半径计算内园半径./计算内外正五边形的点坐标.for(int i=0;i5;i+)lpOuterPointsi.x=(long)(dfRadious0*cos(i*72.0/180*Pi); lpOuterPointsi.y=(long)(dfRadious0*sin(i*72.0/180*Pi); lpInnerPointsi.x=(long)(dfRadious1*cos(i*72.0/180*Pi+36.0/180*Pi); lpInnerPointsi.y=(l

5、ong)(dfRadious1*sin(i*72.0/180*Pi+36.0/180*Pi);switch(iMessage)case WM_PAINT:/处理绘图消息.hDC=BeginPaint(hWnd,&PtStr);/得到设备环境句柄SetMapMode(hDC,MM_ANISOTROPIC);/设置映射模式SetWindowOrgEx(hDC,-100,-100,NULL);/设置坐标原点.hPen=CreatePen(PS_SOLID,1,RGB(255,0,0); SelectObject(hDC,hPen);/创新红色画笔./ 将画笔选入.Polygon(hDC,lpOute

6、rPoints,5);/画正五边形./ 填充正五边形的不同区域 . for(i=0;i5;i+)lpTriangle0=lpOuterPointsi%5;/生成图形中的三角形区域的坐标.lpTriangle1=lpInnerPointsi%5;lpTriangle2=lpOuterPoints(i+1)%5;/创新新画刷 .hBrush=CreateSolidBrush(RGB(i*10,i*20,i*30); SelectObject(hDC,hBrush); / 选入新画刷 . Polygon(hDC,lpTriangle,3); / 画三角形区域 . lpTriangle2=lpInne

7、rPoints(i+4)%5; /生成图形中的三角形区域的坐标 . hBrush=CreateSolidBrush(RGB(i*40,i*30,i*20);/ 创新画刷 .SelectObject(hDC,hBrush);Polygon(hDC,lpTriangle,3);/选入画刷 ./画三角形区域.hBrush=CreateSolidBrush(RGB(255,255,255);/创新白画刷 .SelectObject(hDC,hBrush);/ 选入画刷 .Polygon(hDC,lpInnerPoints,5);/ 画中心的五边形./ 用不同种颜色的画笔来绘制五角星.MoveToEx(

8、hDC,lpOuterPoints0.x,lpOuterPoints0.y,NULL);for(i=1;i=5;i+)hPen=CreatePen(PS_SOLID,1,RGB(0,i*51,0);SelectObject(hDC,hPen);LineTo(hDC,lpOuterPoints(i+2)%5.x,lpOuterPoints(i+2)%5.y);hPen=(HPEN)(GetStockObject(PS_NULL);DeleteObject(hPen);/删除画笔 .DeleteObject(hBrush);/ 删除画刷 .EndPaint(hWnd,&PtStr);/结束绘图 .

9、return 0;case WM_DESTROY:/ 处理关闭窗口信息 .PostQuitMessage(0);/向应用程序发送WM_QUIT 消息 .return 0;default:return(DefWindowProc(hWnd,iMessage,wParam,lParam);BOOL InitWindows(HINSTANCE hInstance, int nCmdShow)/ 初始化HWND hWnd;/ 定义窗口句柄.hWnd=CreateWindow(Polygon,/窗口类名 .五边形 ,/窗口实例标题.WS_OVERLAPPEDWINDOW,/ 窗口风格 .带边框 ,标题栏

10、 ,系统菜单和最大和最小按钮.CW_USEDEFAULT,/ 窗口左上角坐标.0,/窗口左上角坐标.CW_USEDEFAULT,/ 窗口宽度0,/窗口高度NULL,/无父窗口 .NULL,/无主菜单 .hInstance,/创建此窗口的应用程序的当前句柄.NULL);/指向一个传递给窗口的参数值从指针./不使用该值 .if(!hWnd)/如果窗口创建失败,返回 false.return FALSE;hWndMain=hWnd;/将窗口句柄传递给全局变量.ShowWindow(hWnd,nCmdShow);/显示窗口 .UpdateWindow(hWnd);/ 更新并绘制用户区.return T

11、RUE;BOOL InitWindowsClass(HINSTANCE hInstance)/初始化窗口类.WNDCLASS WndClass;/定义窗口类 .WndClass.cbClsExtra=0;/窗口类无扩展.WndClass.cbWndExtra=0;/窗口实例无扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);/窗口背景为白色.WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);/ 窗口采用箭头光标.WndClass.hIcon=LoadIcon(NULL,IDI_AP

12、PLICATION);/ 窗口的最小化图标为缺省图标.WndClass.hInstance=hInstance;/当前实例句柄.WndClass.lpfnWndProc=WndProc;/ 窗口处理函数.WndClass.lpszClassName=Polygon;/窗口类名 .WndClass.lpszMenuName=NULL;/无菜单WndClass.style=0;/窗口类型为缺省类型.return RegisterClass(&WndClass);/返回注册窗口的值.4-6参考答案：#include #include #include #include #define Pi 3.14

13、15926long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam);/ 消息处理函数声明.double dfTheta=0,dfRange=100.0;/正弦曲线的角度变量.long i=0,j=0;long lCentreX=0,lCentreY=0,lRadious=(long)(0.2*dfRange);/定义圆心坐标和圆坐标.POINT lpSin100; /定义正弦曲线的点坐标.int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,L

14、PSTR lpCmdLine,int nCmdShow)/主函数MSG Message;HWND hWnd;/ 定义消息变量./定义窗口句柄.WNDCLASS WndClass;/定义窗口类.WndClass.cbClsExtra=0;/无窗口类扩展.WndClass.cbWndExtra=0;/无窗口实例扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);/背景为白色 .WndClass.hCursor=LoadCursor(NULL,IDC_ARROW); WndClass.hIcon=LoadIcon(NULL,I

15、DI_APPLICATION);/ 窗口采用箭头光标/ 采用缺省图标.WndClass.hInstance=hInstance;/当前应用程序句柄.WndClass.lpfnWndProc=WndProc;/ 窗口处理函数.WndClass.lpszClassName=SIN;WndClass.lpszMenuName=NULL;/窗口类名称 ./无窗口菜单.WndClass.style=0;/窗口类型为缺省类型.if(!RegisterClass(&WndClass)/注册窗口.MessageBeep(0);return FALSE;hWnd=CreateWindow(SIN,/窗口类名 .

16、4_6,/标题名 .WS_OVERLAPPEDWINDOW,/带标题栏 ,最大和最小按钮的窗口CW_USEDEFAULT,/窗口左上角坐标.0,CW_USEDEFAULT,/采用缺省的宽度和高度.0,.NULL,/无父窗口 .NULL,/无主菜单 .hInstance,/当前实例句柄 .NULL);/不要此参数 .ShowWindow(hWnd,nCmdShow);/显示窗口 .UpdateWindow(hWnd);/更新并绘制用户区 .for(int j=0;j100;j+)/ 生成正弦曲线的点坐标 .lpSinj.x=(long)(j*2*Pi/100*60);lpSinj.y=(long

17、)(dfRange*sin(j*2*Pi/100);while(GetMessage(&Message,0,0,0)TranslateMessage(&Message);/消息循环.DispatchMessage(&Message);return Message.wParam;long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam)/消息处理函数.HDC hDC;HBRUSH hBrush;HPEN hPen;PAINTSTRUCT PtStr;/ 定义设备环境句柄./ 定义画刷句柄/ 定义画笔句柄/ 定义包含绘图

18、信息的结构体变量switch(iMessage)case WM_PAINT:/处理绘图消息.hDC=BeginPaint(hWnd,&PtStr);/获得设备环境指针.SetWindowOrgEx(hDC,-200,-200,NULL);/设置原点坐标为(-200,-200).hPen=CreatePen(PS_DASH,1,RGB(255,0,0);/创新画笔SelectObject(hDC,hPen);/选入画笔Polyline(hDC,lpSin,100);/绘制正弦曲线.if(i=25) / 第一个 1/4周期 .hPen=CreatePen(PS_DASH,1,RGB(255,0,0

19、);/ 创新红笔 .hBrush=CreateHatchBrush(HS_BDIAGONAL,RGB(255,0,0);/创新红画刷 .lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25);/计算半径 .else if(i=50)/ 第二个 1/4周期 .hPen=CreatePen(PS_DASH,1,RGB(0,255,0);/ 创新绿笔 .hBrush=CreateHatchBrush(HS_DIAGCROSS,RGB(0,255,0);/创新绿刷 .lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25

20、);/计算半径 .else if(i=75)/ 第三个周期 .hPen=CreatePen(PS_DASH,1,RGB(0,0,255);/ 创新蓝笔 hBrush=CreateHatchBrush(HS_CROSS,RGB(0,0,255);/ 创新蓝刷 . lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25);/ 计算半径 .else/第四个周期 .hPen=CreatePen(PS_DASH,1,RGB(255,255,0);/ 创新黄笔hBrush=CreateHatchBrush(HS_VERTICAL,RGB(255,255,0);/创新

21、黄刷 .lRadious=(long)(dfRange*0.2+i%25*dfRange*0.4/25);/计算半径 .SelectObject(hDC,hBrush);/选入画刷 .SelectObject(hDC,hPen);/ 选入画笔 .lCentreX=lpSini.x;/圆心 x坐标 .lCentreY=lpSini.y;/圆心 y坐标 .Ellipse(hDC,lCentreX-lRadious,lCentreY-lRadious,lCentreX+lRadious,lCentreY+lRadious);/画圆 .i+;DeleteObject(hPen);/删除画笔 .Dele

22、teObject(hBrush);/ 删除画刷 .EndPaint(hWnd,&PtStr);/删除设备环境指针.Sleep(100);/停 0.1秒 .if(i100) InvalidateRect(hWnd,NULL,1);/刷新用户区 .return 0;case WM_DESTROY:/关闭窗口 .PostQuitMessage(0);return 0;default:return(DefWindowProc(hWnd,iMessage,wParam,lParam);4-7参考答案：#include #include #include #include #define Pi 3.141

23、5926long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam);/ 消息处理函数声明.int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)/主函数MSG Message;HWND hWnd;/ 定义消息变量./定义窗口句柄.WNDCLASS WndClass;/定义窗口类.WndClass.cbClsExtra=0;/无窗口类扩展.WndClass.cbWndExtra=0;/无窗口

24、实例扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);/背景为白色 .WndClass.hCursor=LoadCursor(NULL,IDC_ARROW); WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);/ 窗口采用箭头光标/ 采用缺省图标.WndClass.hInstance=hInstance;/当前应用程序句柄.WndClass.lpfnWndProc=WndProc;/ 窗口处理函数.WndClass.lpszClassName=4_7;WndClass.lpsz

25、MenuName=NULL;/窗口类名称 ./无窗口菜单.WndClass.style=0;/窗口类型为缺省类型.if(!RegisterClass(&WndClass)/注册窗口.MessageBeep(0);return FALSE;hWnd=CreateWindow(4_7,/窗口类名 .4_7,/标题名 .WS_OVERLAPPEDWINDOW,/带标题栏 ,最大和最小按钮的窗口CW_USEDEFAULT,/窗口左上角坐标.0,600,/ 采用宽度为 450，高度为 600.450,NULL,/无父窗口 .NULL,/无主菜单 .hInstance,/当前实例句柄.NULL);/不要此

26、参数 .ShowWindow(hWnd,nCmdShow);/显示窗口 .UpdateWindow(hWnd);/更新并绘制用户区.while(GetMessage(&Message,0,0,0)TranslateMessage(&Message);/消息循环.DispatchMessage(&Message);return Message.wParam;long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam)/消息处理函数.HDC hDC;HBRUSH hBrush;HPEN hPen;PAINTSTRUCT P

27、tStr;/ 定义设备环境句柄./ 定义画刷句柄/ 定义画笔句柄/ 定义包含绘图信息的结构体变量switch(iMessage)case WM_PAINT:/处理绘图消息.hDC=BeginPaint(hWnd,&PtStr);/获得设备环境指针.SetMapMode(hDC,MM_ANISOTROPIC);/设置映射模式.SetWindowExtEx(hDC,300,300,NULL);/设置窗口区域.逻辑单位SetViewportExtEx(hDC,600,600,NULL);/设置视口区域.物理单位.SetViewportOrgEx(hDC,0,0,NULL);/设置视口原点坐标为(0,

28、0). 物理单位 ./绘制四个圆形.(笔的样式不同)hBrush = (HBRUSH)GetStockObject(NULL_BRUSH);/选择空画刷 .SelectObject(hDC,hBrush);hPen = CreatePen(PS_DASH,0,RGB(255,0,0);/ 建立虚线样式的红色笔SelectObject(hDC,hPen);/选入设备环境.Ellipse(hDC,0,0,70,70);/画圆 .hPen = CreatePen(PS_DASHDOT,0,RGB(0,255,0);/ 建立点划线样式的绿色笔SelectObject(hDC,hPen);Ellipse

29、(hDC,25,0,95,70);/画圆 .hPen = CreatePen(PS_DASHDOTDOT,0,RGB(0,0,255);/ 建立双点划线样式的蓝色笔 SelectObject(hDC,hPen);Ellipse(hDC,0,25,70,95);hPen = CreatePen(PS_DOT,0,RGB(0,255,255);/ 建立点线样式的天蓝色笔SelectObject(hDC,hPen);Ellipse(hDC,25,25,95,95);/画 6个圆角矩形 .(实画刷样式不同 .)hPen = (HPEN)GetStockObject(BLACK_PEN);SelectO

30、bject(hDC,hPen);hBrush = (HBRUSH)GetStockObject(BLACK_BRUSH);/选择黑画刷 .SelectObject(hDC,hBrush);/ 选入设备环境 .RoundRect(hDC,120,0,165,45,10,10); /画圆角矩形 .hBrush = (HBRUSH)GetStockObject(DKGRAY_BRUSH);/选择深灰画刷 .SelectObject(hDC,hBrush);RoundRect(hDC,165,0,210,45,10,10);hBrush = (HBRUSH)GetStockObject(GRAY_BR

31、USH);/选择灰画刷 .SelectObject(hDC,hBrush);RoundRect(hDC,210,0,255,45,10,10);hBrush = (HBRUSH)GetStockObject(HOLLOW_BRUSH);/选择虚画刷 .SelectObject(hDC,hBrush);RoundRect(hDC,120,45,165,90,10,10);hBrush = (HBRUSH)GetStockObject(LTGRAY_BRUSH);/选择亮灰画刷 .SelectObject(hDC,hBrush);RoundRect(hDC,165,45,210,90,10,10)

32、;hBrush = (HBRUSH)GetStockObject(WHITE_BRUSH);/选择白画刷 .SelectObject(hDC,hBrush);RoundRect(hDC,210,45,255,90,10,10);/画 6个矩形 .(画刷阴影样式不同.)hPen = (HPEN)GetStockObject(BLACK_PEN);SelectObject(hDC,hPen);hBrush = CreateHatchBrush(HS_BDIAGONAL,RGB(200,200,200);/创建 45度左上右下阴影线SelectObject(hDC,hBrush);/ 选入设备环境.

33、Rectangle(hDC,120,90,165,135);/ 画矩形 .hBrush = CreateHatchBrush(HS_DIAGCROSS,RGB(200,200,200);/SelectObject(hDC,hBrush);Rectangle(hDC,165,90,210,135);hBrush = CreateHatchBrush(HS_FDIAGONAL,RGB(200,200,200);/创建 45度交叉线创建 45度左下右上阴影线.SelectObject(hDC,hBrush);Rectangle(hDC,210,90,255,135);hBrush = CreateH

34、atchBrush(HS_CROSS,RGB(200,200,200);/ 创建垂直相交阴影线.SelectObject(hDC,hBrush);Rectangle(hDC,120,135,165,175);hBrush = CreateHatchBrush(HS_HORIZONTAL,RGB(200,200,200);/创建水平阴影线.SelectObject(hDC,hBrush);Rectangle(hDC,165,135,210,175);hBrush = CreateHatchBrush(HS_VERTICAL,RGB(200,200,200);/创建垂直阴影线.SelectObje

35、ct(hDC,hBrush);Rectangle(hDC,210,135,255,175);/画饼图。hPen = (HPEN)GetStockObject(BLACK_PEN);SelectObject(hDC,hPen);hBrush = CreateSolidBrush(RGB(255,0,0);/创建红色画刷。SelectObject(hDC,hBrush);/选入设备环境。Pie(hDC,10,100,/画饼图。100,190,(int)(55+45*cos(2*Pi/3),(int)(145+45*sin(2*Pi/3),(int)(55+45*cos(0),(int)(145+4

36、5*sin(0);hBrush = CreateSolidBrush(RGB(0,255,255);/ 创建天蓝色画刷。SelectObject(hDC,hBrush);/选入设备环境。Pie(hDC,10,100,100,190,(int)(55+45*cos(4*Pi/3),(int)(145+45*sin(4*Pi/3),(int)(55+45*cos(2*Pi/3),(int)(145+45*sin(2*Pi/3); hBrush = CreateSolidBrush(RGB(255,255,0);/ 创建黄色画刷。SelectObject(hDC,hBrush);/选入设备环境。Pi

37、e(hDC,10,100,100,190,(int)(55+45*cos(2*Pi),(int)(145+45*sin(2*Pi),(int)(55+45*cos(4*Pi/3),(int)(145+45*sin(4*Pi/3);EndPaint(hWnd,&PtStr);/释放环境指针。return 0;case WM_DESTROY:/关闭窗口 .PostQuitMessage(0);return 0;default:return(DefWindowProc(hWnd,iMessage,wParam,lParam);4-8参考答案：#include #include #include #i

38、nclude #define Pi 3.1415926long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam);/ 消息处理函数声明.int nNum = 0,nMaxNum = 20;/nMaxNum记录了叶片循环一周中绘图的次数./nNum 记录了当前的序数.int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)/主函数MSG Message;HWND hWnd;/ 定义消息变量./

39、定义窗口句柄.WNDCLASS WndClass;/定义窗口类.WndClass.cbClsExtra=0;/无窗口类扩展.WndClass.cbWndExtra=0;/无窗口实例扩展.WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH);/背景为白色 .WndClass.hCursor=LoadCursor(NULL,IDC_ARROW); WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);/ 窗口采用箭头光标/ 采用缺省图标.WndClass.hInstance=hInstance;

40、/当前应用程序句柄.WndClass.lpfnWndProc=WndProc;/ 窗口处理函数.WndClass.lpszClassName=4_8;WndClass.lpszMenuName=NULL;/窗口类名称 ./无窗口菜单.WndClass.style=0;/窗口类型为缺省类型.if(!RegisterClass(&WndClass)/注册窗口.MessageBeep(0);return FALSE;hWnd=CreateWindow(4_8,/窗口类名 .4_8,/标题名 .WS_OVERLAPPEDWINDOW,/带标题栏,最大和最小按钮的窗口.CW_USEDEFAULT,/窗口

41、左上角坐标0,600,/ 采用宽度为 450，高度为 600.450,NULL,/无父窗口 .NULL,/无主菜单 .hInstance,/当前实例句柄.NULL);/不要此参数 .ShowWindow(hWnd,nCmdShow);/显示窗口 .UpdateWindow(hWnd);/更新并绘制用户区.while(GetMessage(&Message,0,0,0)TranslateMessage(&Message);/消息循环.DispatchMessage(&Message);return Message.wParam;long WINAPI WndProc(HWND hWnd,UINT

42、 iMessage,UINT wParam,LONG lParam)/消息处理函数.HDC hDC;HBRUSH hBrush;HPEN hPen;PAINTSTRUCT PtStr;int nCentreX,nCentreY;/ 定义设备环境句柄./ 定义画刷句柄/ 定义画笔句柄/ 定义包含绘图信息的结构体变量/定义 3个叶片的圆心的坐标.double fAngle;switch(iMessage)case WM_PAINT:/处理绘图消息.hDC=BeginPaint(hWnd,&PtStr);/获得设备环境指针.SetMapMode(hDC,MM_ANISOTROPIC);/设置映射模式

43、.SetWindowExtEx(hDC,400,300,NULL);/设置窗口区域.逻辑单位 .SetViewportExtEx(hDC,600,450,NULL);/设置视口区域.物理单位 .SetViewportOrgEx(hDC,300,200,NULL);/设置视口原点坐标为(300,200).物理单位./绘制外圆。hPen = (HPEN)GetStockObject(BLACK_PEN);SelectObject(hDC,hPen);Ellipse(hDC,-100,-100,100,100);/绘制风车的叶片。hBrush = CreateSolidBrush(RGB(255,0

44、,0);/画红色的叶片.SelectObject(hDC,hBrush);fAngle = 2*Pi/nMaxNum*nNum;nCentreX = (int)(50*cos(fAngle);nCentreY = (int)(50*sin(fAngle);Pie(hDC,nCentreX-50,nCentreY-50,nCentreX+50,nCentreY+50,(int)(nCentreX+50*cos(fAngle),(int)(nCentreY+50*sin(fAngle),(int)(nCentreX+50*cos(fAngle+Pi),(int)(nCentreY+50*sin(f

45、Angle+Pi);hBrush = CreateSolidBrush(RGB(255,255,0);/ 画天蓝色的叶片.SelectObject(hDC,hBrush);nCentreX = (int)(50*cos(fAngle+2*Pi/3);nCentreY = (int)(50*sin(fAngle+2*Pi/3);Pie(hDC,nCentreX-50,nCentreY-50,nCentreX+50,nCentreY+50,(int)(nCentreX+50*cos(fAngle+2*Pi/3),(int)(nCentreY+50*sin(fAngle+2*Pi/3),(int)(nCentreX+50*cos(fAngle+Pi+2*Pi/3),(int)(nCentreY+50*sin(fAngle+Pi+2*Pi/3);hBrush = CreateSolidBrush(RGB(0,255,255);/ 画黄色的叶片.SelectObject(hDC,hBrush);nCentreX = (int)(50*cos(fAngle+4*Pi/3);nCentreY = (int)(50*sin(fAngle+4*Pi/3