This example shows how pChart is dealing with missing values. Both line and curve graphs are interrupted. The Y axis caption is set using the SetYAxisName function. Different graph type are associated to different series calling both RemoveSerie and AddSerie.


Output :


Source code :

 <?php
  // Standard inclusions   
  include("pChart/pData.class");
  include("pChart/pChart.class");
 
  // Dataset definition 
  $DataSet = new pData;
  $DataSet->AddPoint(array(2,5,7,"","",5,6,4,8,4,"",2,5,6,4,5,6,7,6),"Serie1");
  $DataSet->AddPoint(array(-1,-3,-1,-2,-4,-1,"",-4,-5,-3,-2,-2,-3,-3,-5,-4,-3,-1,""),"Serie2");
  $DataSet->AddAllSeries();
  $DataSet->SetAbsciseLabelSerie();
  $DataSet->SetSerieName("Raw #1","Serie1");
  $DataSet->SetSerieName("Raw #2","Serie2");
  $DataSet->SetYAxisName("Response time");
  $DataSet->SetXAxisName("Sample #ID");

  // Initialise the graph
  $Test = new pChart(700,230);
  $Test->setFontProperties("Fonts/tahoma.ttf",8);
  $Test->setGraphArea(55,30,585,185);
  $Test->drawFilledRoundedRectangle(7,7,693,223,5,240,240,240);
  $Test->drawRoundedRectangle(5,5,695,225,5,230,230,230);
  $Test->drawGraphArea(255,255,255,TRUE);
  $Test->drawScale($DataSet->GetData(),$DataSet->GetDataDescription(),SCALE_NORMAL,150,150,150,TRUE,0,2,TRUE);
  $Test->drawGrid(4,TRUE,230,230,230,50);

  // Draw the 0 line
  $Test->setFontProperties("Fonts/tahoma.ttf",6);
  $Test->drawTreshold(0,143,55,72,TRUE,TRUE);

  // Draw the line graph
  $DataSet->RemoveSerie("Serie2");
  $Test->drawFilledLineGraph($DataSet->GetData(),$DataSet->GetDataDescription(),60,TRUE);   

  // Draw the curve graph
  $DataSet->RemoveSerie("Serie1");
  $DataSet->AddSerie("Serie2");
  $Test->drawCubicCurve($DataSet->GetData(),$DataSet->GetDataDescription());
  $Test->drawPlotGraph($DataSet->GetData(),$DataSet->GetDataDescription(),3,2,255,255,255);   

  // Finish the graph
  $Test->setFontProperties("Fonts/tahoma.ttf",8);
  $Test->drawLegend(600,30,$DataSet->GetDataDescription(),255,255,255);
  $Test->setFontProperties("Fonts/tahoma.ttf",10);
  $Test->drawTitle(50,22,"Example 18",50,50,50,585);
  $Test->Render("example18.png");
 ?>
 

If you want to send the picture directly in a browser, replace the Render() command by Stroke().