转载原文：使用Win32API 编程方法编写一个程序绘制直方图和饼图
MFC 工程中的代码
void CChildView::OnPaint() { CPaintDC dc(this); // device context for painting// 改字体 LOGFONT log; CFont font; log.lfHeight=0; log.lfEscapement=0; log.lfItalic=0; log.lfUnderline=0; log.lfStrikeOut=0;// dc.SelectObject(&font); font.CreateFontIndirect(&log); //画笔 CPen pen(PS_SOLID,1,RGB(0,0,0)); dc.SelectObject(&pen); // *OldPen = dc.SelectObject(&pen);//旧画笔 //逻辑坐标 SetViewportOrgEx(dc,50,500,NULL); dc.SetMapMode(MM_LOMETRIC);//0.1毫米 //纵坐标 dc.MoveTo(0,0); dc.LineTo(0,1000);//高1000 dc.LineTo(-10,980); dc.MoveTo(0,1000); dc.LineTo(10,980); //纵坐标循环 CString str; int i; for(i=1;i<10;i++) { str.Format("%d",i*10); dc.TextOut(-30,i*100,str); } dc.TextOut(-50,1050,"%"); //横坐标 dc.MoveTo(0,0); dc.LineTo(850,0); dc.LineTo(830,10); dc.MoveTo(850,0); dc.LineTo(830,-10); int x1,y1,x2,y2,y3,x3; float zhuan=0.4,ben=0.3,shuo=0.2,bo=0.1; int h=1000,r=400; //画柱子 dc.SelectObject(&font); //修改字体 CRect r1(100,zhuan*h,200,0); CBrush br1(RGB(253,51,67)); dc.FillRect(r1,&br1);//矩形，颜色 dc.TextOut(130,-10,"专科");//横坐标的说明文字 CRect r2(300,ben*h,400,0); CBrush br2(RGB(250,164,51)); dc.FillRect(r2,&br2); dc.TextOut(330,-10,"本科"); CRect r3(500,shuo*h,600,0); CBrush br3(RGB(139,197,51)); dc.FillRect(r3,&br3); dc.TextOut(530,-10,"硕士"); CRect r4(700,bo*h,800,0); CBrush br4(RGB(3,141,216)); dc.FillRect(r4,&br4); dc.TextOut(730,-10,"博士");// dc.SetBkColor(RGB(0,0,0));// dc.Rectangle(100,zhuan*h,200,0);// dc.Rectangle(300,ben*h,400,0);// dc.Rectangle(500,shuo*h,600,0);// dc.Rectangle(700,bo*h,800,0); //画饼图，利用cos，sin函数计算顶点值，颜色沿用之前已经定义了的brush dc.SelectObject(&br1); x1=int(r*cos(zhuan*3.14*2))+1400; y1=int(r*sin(zhuan*3.14*2)+400); dc.Pie(1000,800,1800,0,1800,400,x1,y1); dc.SelectObject(&br2); x2=int(r*cos((ben+zhuan)*3.14*2))+1400; y2=int(r*sin((ben+zhuan)*3.14*2))+400; dc.Pie(1000,800,1800,0,x1,y1,x2,y2); dc.SelectObject(&br3); x3=int(r*cos((ben+zhuan+shuo)*3.14*2))+1400; y3=int(r*sin((ben+zhuan+shuo)*3.14*2))+400; dc.Pie(1000,800,1800,0,x2,y2,x3,y3); CBrush br9(RGB(125,30,227)); dc.SelectObject(&br9); dc.SelectObject(&br4); dc.Pie(1000,800,1800,0,x3,y3,1800,400); //在园外右上角画图例，加上说明文字 CRect r5(2000,1000,2080,1060); dc.FillRect(r5,&br1); dc.TextOut(2100,1040,"专科"); CRect r6(2000,900,2080,960); dc.FillRect(r6,&br2); dc.TextOut(2100,940,"本科"); CRect r7(2000,800,2080,860); dc.FillRect(r7,&br3); dc.TextOut(2100,840,"硕士"); CRect r8(2000,700,2080,760); dc.FillRect(r8,&br4); dc.TextOut(2100,740,"博士"); // TODO: Add your message handler code here // Do not call CWnd::OnPaint() for painting messages}
PS:
CPaintDC和CClientDC的区别
CPaintDC类是CDC类的一个派生类，一般用在响应WM_PAINT消息的函数OnPaint()中。如果在OnPaint函数内定义了CPaintDC类的对象，通过这个类对象就可以使用CDC类的成员函数完成视图客户区中的图形绘制操作。
CClientDC类也是CDC类的派生类。它只能在窗口的客户区（即窗口中除了边框、标题栏、菜单栏以及状态栏外的中间部分）中进行绘图，坐标点（0,0）通常指的是客户区的左上角。