MOOC清华《VC++面向对象与可视化程序设计》第2章：Windows绘图-例（3）移动图形的绘制

#include <windows.h>#include <stdlib.h>#include <string.h>#include <math.h>#define Pi 3.1415926long 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 lpSin[100];//定义正弦曲线的点坐标.int WINAPI WinMain(HINSTANCE hInstance,   HINSTANCE hPrevInstance,   LPSTR lpCmdLine,   int nCmdShow)//主函数{MSG Message;//定义消息变量.HWND hWnd;//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(BLACK_BRUSH));//背景为黑色.WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);//窗口采用箭头光标.WndClass.hIcon=LoadIcon(NULL,IDI_APPLICATION);//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";//窗口类名称.WndClass.lpszMenuName=NULL;//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."刘聪的第一个动态程序",//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;j<100;j++)//生成正弦曲线的点坐标.{lpSin[j].x=(long)(j*2*Pi/100*60);lpSin[j].y=(long)(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;//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));//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);//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=lpSin[i].x;//圆心x坐标.lCentreY=lpSin[i].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.DeleteObject(hBrush);//删除画刷.EndPaint(hWnd,&PtStr);//删除设备环境指针.Sleep(500);//停0.1秒.if(i<100) 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));}}