用图形开发控件ProEssentials创建极坐标图

极坐标图表是一种圆形极线图，上面的数据点使用角度和到中心点的距离来表示。 X轴位于圆圈的边界上，Y 轴连接圆心与 X 轴，图表上的每一个数据点对应一对X,Y值。下面我用工控图表控件ProEssentials介绍如何创建一个简单的极坐标图表。

极坐标图表：

ProEssentials创建极坐标图表源代码：

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void CPEView::CreateSimplePolar() {    //! Right button click to show popup menu. //    //! Double Click to show customization dialog. //    //! Left-Click and drag to draw zoom box. Use popup memu or 'z' to undo zoom. //      // Simple example show the basics of a polar object. //    // Polar Graph's contain both YData and XData. //      RECT rect;    GetClientRect( &rect );      // Construct Object //    m_hPE = PEcreate(PECONTROL_PGRAPH, WS_VISIBLE, &rect, m_hWnd, 1001);                      PEnset(m_hPE, PEP_nSUBSETS, 2);    PEnset(m_hPE, PEP_nPOINTS, 360);      int p;    float f1, f2;    for (p=0; p<360; p++)    {        f1 = (float) p;        f2 = (float) 150 * sin((double) p * 0.054F);        PEvsetcellEx(m_hPE, PEP_faXDATA, 0, p, &f1);        PEvsetcellEx(m_hPE, PEP_faYDATA, 0, p, &f2);    }             for (p=0; p<360; p++)    {        f1 = (float) p;        f2 = (float) 150 * sin(((double) p * 0.044F)) * 2;        PEvsetcellEx(m_hPE, PEP_faXDATA, 1, p, &f1);        PEvsetcellEx(m_hPE, PEP_faYDATA, 1, p, &f2);    }      PEnset(m_hPE, PEP_nPLOTTINGMETHOD, PEGPM_LINE);    PEnset(m_hPE, PEP_nALLOWZOOMING, 1);    PEszset(m_hPE, PEP_szMAINTITLE, TEXT("Polar Chart"));    PEszset(m_hPE, PEP_szSUBTITLE, TEXT("")); // no subtitle    float ftmp = .9F;    PEvset(m_hPE, PEP_fFONTSIZELEGENDCNTL, &ftmp, 1 );    PEnset(m_hPE, PEP_bPREPAREIMAGES, TRUE);    PEnset(m_hPE, PEP_bCACHEBMP, TRUE);    PEnset(m_hPE, PEP_bFOCALRECT, FALSE);      // Set line types    int nTypes[] = { PELT_MEDIUMSOLID, PELT_MEDIUMSOLID };    PEvset(m_hPE, PEP_naSUBSETLINETYPES, nTypes, 2);      // Set point types    int nPTypes[] = { PEPT_DOTSOLID, PEPT_PLUS };    PEvset(m_hPE, PEP_naSUBSETPOINTTYPES, nTypes, 2);      // subset colors    DWORD dwArray[2] = { PERGB(128, 198,0,0), PERGB(128, 0, 198, 0) };    PEvset( m_hPE, PEP_dwaSUBSETCOLORS, dwArray, 2);                  // subset labels    PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 0, TEXT("Signal #1" ));    PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 1, TEXT("Signal #2" ));      double dnull = -99999.0F;    PEvset(m_hPE, PEP_fNULLDATAVALUEX, &dnull, 1);    PEvset(m_hPE, PEP_fNULLDATAVALUE, &dnull, 1);      // Set Various other features //    PEnset(m_hPE, PEP_bFIXEDFONTS, TRUE);    PEnset(m_hPE, PEP_bBITMAPGRADIENTMODE, TRUE);    PEnset(m_hPE, PEP_nQUICKSTYLE, PEQS_MEDIUM_NO_BORDER);    PEnset(m_hPE, PEP_bSIMPLEPOINTLEGEND, TRUE);    PEnset(m_hPE, PEP_bSIMPLELINELEGEND, TRUE);    PEnset(m_hPE, PEP_nLEGENDSTYLE, PELS_1_LINE);    PEnset(m_hPE, PEP_nZOOMSTYLE, PEZS_RO2_NOT);    PEnset(m_hPE, PEP_nPOINTSIZE, PEPS_SMALL);      PEnset(m_hPE, PEP_nTEXTSHADOWS, PETS_BOLD_TEXT);    PEnset(m_hPE, PEP_bMAINTITLEBOLD, TRUE);    PEnset(m_hPE, PEP_bSUBTITLEBOLD, TRUE);    PEnset(m_hPE, PEP_bLABELBOLD, TRUE);    PEnset(m_hPE, PEP_bLINESHADOWS, TRUE);    PEnset(m_hPE, PEP_nFONTSIZE, PEFS_MEDIUM);    PEnset(m_hPE, PEP_nGRADIENTBARS, 8);    PEnset(m_hPE, PEP_nDATASHADOWS, PEDS_SHADOWS);    float f = 1.2F;    PEvset(m_hPE, PEP_fFONTSIZEGNCNTL, &f, 1);    PEnset(m_hPE, PEP_nIMAGEADJUSTBOTTOM, 100);      // Improves metafile export //    PEnset(m_hPE, PEP_nDPIX, 600);    PEnset(m_hPE, PEP_nDPIY, 600);      // Set Demo's RenderEngine to Gdi Plus //    CMDIFrameWnd* pWnd = (CMDIFrameWnd*) AfxGetApp()->GetMainWnd();    pWnd->SendMessage(WM_CHANGE_METAFILE, PEPLAYMETAFILEGDIPLUS );      }   //***************************