You may want to display your data series with different kind of charts using the same scale. This kind of data representation are called combo charts. To create one with pChart follow the following steps :


Using the setSerieDrawable() function you can easily activate / deactivate data series processing by all charting and drawing functions. You can re-use this scheme to draw as many different charts you want.

/* pChart library inclusions */
 include("../class/pData.class.php");
 include("../class/pDraw.class.php");
 include("../class/pImage.class.php");

 /* Create the pData object with some random values*/
 $MyData = new pData(); 
 $MyData->addPoints(array(30,24,32),"This year");
 $MyData->addPoints(array(28,20,27),"Last year");
 $MyData->addPoints(array("Year","Month","Day"),"Labels");
 $MyData->setAbscissa("Labels");

 /* Create the pChart object */
 $myPicture = new pImage(700,230,$MyData);

 /* Create a solid background */
 $Settings = array("R"=>179, "G"=>217, "B"=>91, "Dash"=>1, "DashR"=>199, "DashG"=>237, "DashB"=>111);
 $myPicture->drawFilledRectangle(0,0,700,230,$Settings);

 /* Do a gradient overlay */
 $Settings = array("StartR"=>194, "StartG"=>231, "StartB"=>44, "EndR"=>43, "EndG"=>107, "EndB"=>58, "Alpha"=>50);
 $myPicture->drawGradientArea(0,0,700,230,DIRECTION_VERTICAL,$Settings);
 $myPicture->drawGradientArea(0,0,700,20,DIRECTION_VERTICAL,array("StartR"=>0,"StartG"=>0,"StartB"=>0,"EndR"=>50,"EndG"=>50,"EndB"=>50,"Alpha"=>100));

 /* Add a border to the picture */
 $myPicture->drawRectangle(0,0,699,229,array("R"=>0,"G"=>0,"B"=>0));
 
 /* Write the picture title */ 
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Silkscreen.ttf","FontSize"=>6));
 $myPicture->drawText(10,13,"Chart title",array("R"=>255,"G"=>255,"B"=>255));

 /* Draw the scale */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Forgotte.ttf","FontSize"=>11));
 $myPicture->setGraphArea(50,60,670,190);
 $myPicture->drawFilledRectangle(50,60,670,190,array("R"=>255,"G"=>255,"B"=>255,"Surrounding"=>-200,"Alpha"=>10));
 $myPicture->drawScale(array("CycleBackground"=>TRUE));

 /* Graph title */
 $myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>10));
 $myPicture->drawText(50,52,"Chart subtitle",array("FontSize"=>20,"Align"=>TEXT_ALIGN_BOTTOMLEFT));

 /* Draw the bar chart chart */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/pf_arma_five.ttf","FontSize"=>6));
 $MyData->setSerieDrawable("Last year",FALSE);
 $myPicture->drawBarChart();

 /* Draw the line and plot chart */
 $MyData->setSerieDrawable("Last year",TRUE);
 $MyData->setSerieDrawable("This year",FALSE);
 $myPicture->drawSplineChart();
 $myPicture->drawPlotChart();

 /* Make sure all series are drawable before writing the scale */
 $MyData->setSerieDrawable("This year",TRUE);

 /* Write the legend */
 $myPicture->drawLegend(540,35,array("Style"=>LEGEND_ROUND,"Alpha"=>20,"Mode"=>LEGEND_HORIZONTAL));

 /* Render the picture (choose the best way) */
 $myPicture->autoOutput("pictures/example.combo.png");