This example shows how to create a simple stacked bar graph containing three data series. Data are manualy set using the AddPoint() method of the pData class. The graph function called is drawStackedBarGraph(). When doing bar graph, be sure to scale it setting the $WithMargin parameter of the drawScale() function to TRUE and the Scale mode to SCALE_ADDALL to get the correct maximum value. Running this script will create a example12.png file in the current directory.

Output :


Source code :

 <?php
  // Standard inclusions   
  include("pChart/pData.class");
  include("pChart/pChart.class");

  // Dataset definition 
  $DataSet = new pData;
  $DataSet->AddPoint(array(1,4,-3,2,-3,3,2,1,0,7,4),"Serie1");
  $DataSet->AddPoint(array(3,3,-4,1,-2,2,1,0,-1,6,3),"Serie2");
  $DataSet->AddPoint(array(4,1,2,-1,-4,-2,3,2,1,2,2),"Serie3");
  $DataSet->AddAllSeries();
  $DataSet->SetAbsciseLabelSerie();
  $DataSet->SetSerieName("January","Serie1");
  $DataSet->SetSerieName("February","Serie2");
  $DataSet->SetSerieName("March","Serie3");

  // Initialise the graph
  $Test = new pChart(700,230);
  $Test->setFontProperties("Fonts/tahoma.ttf",8);
  $Test->setGraphArea(50,30,680,200);
  $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_ADDALL,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 bar graph
  $Test->drawStackedBarGraph($DataSet->GetData(),$DataSet->GetDataDescription(),TRUE);

  // Finish the graph
  $Test->setFontProperties("Fonts/tahoma.ttf",8);
  $Test->drawLegend(596,150,$DataSet->GetDataDescription(),255,255,255);
  $Test->setFontProperties("Fonts/tahoma.ttf",10);
  $Test->drawTitle(50,22,"Example 20",50,50,50,585);
  $Test->Render("example20.png");
 ?>
 

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