Displays a pie chart by means of the <svg> tag and associated javascript. Returns: None

Declared in file: hzDissemino.h
Defined in file : hdsGenerate.cpp

Function Logic:

Function body:

void hdsChartPie::Generate (hzChain& Z)hzHttpEvent* pE, uint32_t& nLine, 
{
   //  Category: HTML Generation
   //  
   //  Displays a pie chart by means of the <svg> tag and associated javascript.
   //  
   //  Arguments: 1) Z  The HTML output chain
   //     2) pE  The HTTP event being responded to
   //     3) nLine Line number tracker (controls NL printing)
   //  
   //  Returns: None
   _hzfunc("hdsChartPie::Generate") ;
   _pie*       pSlice ;        //  Pie value
   double      val ;           //  Current segment value
   double      sofar ;         //  Total value of all segments so far processed
   double      deg ;           //  Angle from top
   double      ang ;           //  Angle in radians
   uint32_t    X ;             //  Destination horizontal coord
   uint32_t    Y ;             //  Destination vertical coord
   uint32_t    last_y = 0; //  y-coord
   uint32_t    last_x = 0; //  x-coord
   uint32_t    n ;             //  Parts iterator
   uint32_t    bSmall ;        //  Short arc indicator
   //  char buf[200] ;
   //  Open svg tag
   Z.Printf("\n<svg id=\"%s\" height=\"%d\" width=\"%d\" style=\"background:#%06x;\">", *m_Id, m_Height, m_Width, m_BgColor) ;
   //  Draw header and footer if applicable
   if (m_Header)
       _hds_svg_drawText(Z, m_Header, m_Width/2,20,m_FgColor,1);
   //  Work out what percentage of the total, each part represents
   last_x = m_ccX ;
   last_y = m_ccY - m_Rad ;
   sofar = val = 0.0;
   for (n = 0; n < m_nSlices ; n++)
   {
       pSlice = m_pSlices + n ;
       bSmall = pSlice->m_nValue/m_Total >&eq; 0.5?1:0;
       Z << "\t<path d=\"" ;
       if ((n+1)== m_nSlices)
       {
           X = m_ccX ;
           Y = m_ccY - m_Rad ;
           Z.Printf("M %u %u L %u %u A %u %u 0 %d 1 %u %u Z\" fill=\"#%06x\"/>\n", m_ccX, m_ccY, last_x, last_y, m_Rad, m_Rad, bSmall, X, Y, pSlice->color) ;
       }
       else
       {
           sofar += pSlice->m_nValue ;
           deg = (360*sofar)/m_Total;
           ang = (deg * M_PI)/180;
           X = m_ccX + (m_Rad * sin(ang)) ;
           Y = m_ccY - (m_Rad * cos(ang)) ;
           Z.Printf("M %u %u L %u %u A %u %u 0 %d 1 %u %u Z\" fill=\"#%06x\"/>\n", m_ccX, m_ccY, last_x, last_y, m_Rad, m_Rad, bSmall, X, Y, pSlice->color) ;
           last_x = X ;
           last_y = Y ;
       }
   }
   //  Write index
   X = m_ccX + m_Rad + 40;
   Y = m_ccY - m_Rad ;
   for (n = 0; n < m_nSlices ; n++)
   {
       pSlice = m_pSlices + n ;
       Z.Printf("<rect x=\"%u\" y=\"%u\" width=\"%u\" height=\"%u\" style=\"fill:#%06x;stroke:#%06x;stroke-width:1\"/>\n",
           X, Y, 12,12,pSlice->color,m_FgColor,1);
       _hds_svg_drawText(Z, pSlice->header, X+15,Y+12,m_FgColor,0);
       Y += 20;
   }
   if (m_Footer)
       _hds_svg_drawText(Z, m_Footer, m_Width/2,m_Height - 20,m_FgColor,1);
   Z << "</svg>\n" ;
}