用图形开发控件ProEssentials创建饼图

饼图通常以百分比的形式显示信息，比如产品销售额、产品产量等。下面为大家展示如何用工控图表控件ProEssentials 创建一个简单的饼图图形。

这个饼图展示了美国不同州的几种水果产量情况。ProEssentials v7又在之前的版本上做了一些改进，在图表上滚动鼠标可以分别查看几种水果的产量图表。双击饼图上的标签，还可以将饼图对应的那一块分离出来。这个饼图还将那些太小的分片集合分类成*Other，这样可以提高图表数据的可读性。这里只展示了一张图片，要体验这些功能，请下载ProEssentials v7。

源代码：

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void CPEView::CreateSimplePie() {      RECT rect;    GetClientRect( &rect );      // Construct Object //    m_hPE = PEcreate(PECONTROL_PIE, WS_VISIBLE, &rect, m_hWnd, 1001);    PEnset(m_hPE, PEP_nSUBSETS, 5);    PEnset(m_hPE, PEP_nPOINTS, 12);    int s,p;             for (s=0; s<5; s++)    {        for (p=0; p<12; p++)        {            float f1 = (float) GetRandom(1, 5) + ((float) GetRandom(1, 100) / 100.0F);            PEvsetcellEx(m_hPE, PEP_faXDATA, s, p, &f1);        }    }    float f1= 0.0F;    PEvsetcellEx(m_hPE, PEP_faXDATA, 0, 3, &f1);        // Set Subset labels //    PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 0, TEXT("Apples" ));    PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 1, TEXT("Oranges" ));    PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 2, TEXT("Pears"  ));    PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 3, TEXT("Plums" ));    PEvsetcell( m_hPE, PEP_szaSUBSETLABELS, 4, TEXT("Peaches" ));      // Set Slice Labels //    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 0, TEXT("Texas"      ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 1, TEXT("Oklahoma"   ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 2, TEXT("Kansas"));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 3, TEXT("New Mexico" ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 4, TEXT("Colorado"   ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 5, TEXT("Wyoming"    ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 6, TEXT("Utah"       ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 7, TEXT("Arizona"   ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 8, TEXT("Nebraska"    ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 9, TEXT("South Dakota"       ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 10, TEXT("North Dakota"   ));    PEvsetcell( m_hPE, PEP_szaPOINTLABELS, 11, TEXT("Iowa"    ));      // Set Slice Colors //    DWORD c[13];    c[0] = PERGB( 255, 198, 0, 0);    c[1] = PERGB( 255, 0, 198, 0);    c[2] = PERGB( 255, 198, 198, 0);    c[3] = PERGB( 255, 0, 0, 198);    c[4] = PERGB( 255, 198, 0, 198);    c[5] = PERGB( 255, 0, 198, 198);    c[6] = PERGB( 255, 192, 192, 192);    c[7] = PERGB( 255, 148, 0, 0);    c[8] = PERGB( 255, 0, 148, 0);    c[9] = PERGB( 255, 148, 148, 0);    c[10] = PERGB( 255,0, 168, 168);    c[11] = PERGB( 255, 132, 132, 132);    c[12] = PERGB( 255, 0, 0, 0);    PEvset(m_hPE, PEP_dwaSUBSETCOLORS, c, 13);      // Set Main Title    PEszset(m_hPE, PEP_szMAINTITLE, TEXT("Produce by State"));    PEszset(m_hPE, PEP_szSUBTITLE, TEXT("")); // no subtitle      // Set various other properties //    PEnset(m_hPE, PEP_nDATAPRECISION, 1);                      PEnset(m_hPE, PEP_nGROUPINGPERCENT, 4);    PEnset(m_hPE, PEP_nDATASHADOWS, PEDS_3D);                        PEnset(m_hPE, PEP_bDISABLE3DSHADOW, FALSE);    PEnset(m_hPE, PEP_nAUTOEXPLODE, PEAE_ALLSUBSETS);    PEnset(m_hPE, PEP_bFOCALRECT, FALSE);    PEnset(m_hPE, PEP_bPREPAREIMAGES, TRUE);    PEnset(m_hPE, PEP_bCACHEBMP, TRUE);    PEnset(m_hPE, PEP_nFONTSIZE, PEFS_MEDIUM);    PEnset(m_hPE, PEP_bFIXEDFONTS, TRUE);      PEnset(m_hPE, PEP_bBITMAPGRADIENTMODE, TRUE);    PEnset(m_hPE, PEP_nQUICKSTYLE, PEQS_LIGHT_NO_BORDER);      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_nFONTSIZE, PEFS_LARGE);      // 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 );   }   //***************************************************************************