用图形开发控件ProEssentials创建科学图表对象

Scientific Graph Control类似于Graph控件，但它是以水平和垂直的双坐标轴来展示信息的。这个组件通常用于表现技术类型的信息，比如电子部件当前的电压与电流的关系。下面为大家展示用工控图表控件ProEssentials创建的一个比较简单的Scientific Graph Control，如下图：

Scientific Graph能处理各种格式化的date/time值，ProEssentials date/time能处理世纪到秒的时间。

下面是ProEssentials创建Scientific Graph Control的源代码：

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113

void CPEView::CreateSimpleSGraph() {    //! 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 scientific graph object. //    // Scientific Graph's contain both YData and XData and thus data    // is not plotted equally spaced as the graph object does.      RECT rect;    GetClientRect( &rect );    m_hPE = PEcreate(PECONTROL_SGRAPH, WS_VISIBLE, &rect, m_hWnd, 1001);    if( m_hPE )    {        float fY;        float fX;          // Enable middle mouse dragging //        PEnset(m_hPE, PEP_bMOUSEDRAGGINGX, TRUE);        PEnset(m_hPE, PEP_bMOUSEDRAGGINGY, TRUE);          // Enable Bar Glass Effect //        PEnset(m_hPE, PEP_bBARGLASSEFFECT, TRUE);          // Enable Plotting style gradient and bevel features //        PEnset(m_hPE, PEP_nAREAGRADIENTSTYLE,  PEPGS_RADIAL_BOTTOM_RIGHT);        PEnset(m_hPE, PEP_nAREABEVELSTYLE, PEBS_MEDIUM_SMOOTH);        PEnset(m_hPE, PEP_nSPLINEGRADIENTSTYLE,  PEPGS_RADIAL_BOTTOM_RIGHT);        PEnset(m_hPE, PEP_nSPLINEBEVELSTYLE, PESBS_MEDIUM_SMOOTH);          // Set number of Subsets and Points //        PEnset(m_hPE, PEP_nSUBSETS, 4);         PEnset(m_hPE, PEP_nPOINTS, 12);           for( int s=0; s<=3; s++ )        {            for( int p=0; p<=11; p++ )            {                                                         fX = ((float) (p+1)) * 100.0F + ((float) GetRandom(2, 250)) / 50.0F;                PEvsetcellEx (m_hPE, PEP_faXDATA, s, p, &fX);                fY = ((float) (p+1) * 1.0F) + GetRandom(1, 250) + 700.0F - ((float) (s * 140.0F)) + ((float) GetRandom(2, 250)) / 250.0F;                PEvsetcellEx (m_hPE, PEP_faYDATA, s, p, &fY);            }        }          // Set DataShadows to show shadows        PEnset(m_hPE, PEP_nDATASHADOWS, PEDS_SHADOWS);          PEszset(m_hPE, PEP_szMAINTITLE, TEXT("Example Data"));        PEszset(m_hPE, PEP_szSUBTITLE, TEXT("")); // no subtitle        PEszset(m_hPE, PEP_szYAXISLABEL, TEXT("Units Sold"));        PEszset(m_hPE, PEP_szXAXISLABEL, TEXT("Month"));        PEnset(m_hPE, PEP_bFOCALRECT, FALSE);        PEnset(m_hPE, PEP_bPREPAREIMAGES, TRUE);        PEnset(m_hPE, PEP_bCACHEBMP, TRUE);        PEnset(m_hPE, PEP_nPLOTTINGMETHOD, PEGPM_SPLINE);        PEnset(m_hPE, PEP_nGRIDLINECONTROL, PEGLC_BOTH);        PEnset(m_hPE, PEP_nGRIDSTYLE, PEGS_DOT);        PEnset(m_hPE, PEP_nALLOWZOOMING, PEAZ_HORZANDVERT);        PEnset(m_hPE, PEP_nZOOMSTYLE, PEZS_RO2_NOT);          // subset labels        PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 0, TEXT("Texas"));        PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 1, TEXT("Florida" ));        PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 2, TEXT("Washington" ));        PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 3, TEXT("California" ));          // subset colors        DWORD dwArray[4] = { PERGB(128,198,0,0), PERGB(128, 0, 198, 198 ), PERGB(128, 198,198,0 ), PERGB(128, 0,198,0 ) };        PEvsetEx( m_hPE, PEP_dwaSUBSETCOLORS, 0, 4, dwArray, 0 );          // subset line types        int nLineTypes[] = { PELT_MEDIUMSOLID, PELT_MEDIUMSOLID, PELT_MEDIUMSOLID, PELT_MEDIUMSOLID };        PEvset(m_hPE, PEP_naSUBSETLINETYPES, nLineTypes, 4);          // subset point types        int nPointTypes[] = { PEPT_DOTSOLID, PEPT_UPTRIANGLESOLID, PEPT_SQUARESOLID, PEPT_DOWNTRIANGLESOLID };        PEvset(m_hPE, PEP_naSUBSETPOINTTYPES, nPointTypes, 4);          // Version 4.0 Features //        PEnset(m_hPE, PEP_bFIXEDFONTS, TRUE);        PEnset(m_hPE, PEP_bSIMPLEPOINTLEGEND, TRUE);        PEnset(m_hPE, PEP_bSIMPLELINELEGEND, TRUE);        PEnset(m_hPE, PEP_nLEGENDSTYLE, PELS_1_LINE);        PEnset(m_hPE, PEP_nMULTIAXISSTYLE, PEMAS_SEPARATE_AXES);          // Set Various Other Properties //        PEnset(m_hPE, PEP_bBITMAPGRADIENTMODE, TRUE);        PEnset(m_hPE, PEP_nQUICKSTYLE, PEQS_MEDIUM_NO_BORDER);          PEnset(m_hPE, PEP_nGRADIENTBARS, 8);        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_LARGE);        PEnset(m_hPE, PEP_bSCROLLINGHORZZOOM, TRUE);        PEnset(m_hPE, PEP_nDATAPRECISION, 1);          // 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 );      } }   //************************