PHP Class to build Charts using GD Library

pChart is one of the most powerful php library to generate charts or graphs using php GD library. You can add data to your chart from MySQL tables or from CSV file. Usually chart library are not free but pChart is free and providing lots of options. Click here to know more about pChart.

Lets Create a simple line chart

First of all include the required library files.

include("pChart/pData.class");
include("pChart/pChart.class");  

Generate the chart

In this example we are retrieving the data from csv file and generate an image called example1.png.

// Dataset definition 
$DataSet = new pData; 
$DataSet->ImportFromCSV("Sample/bulkdata.csv",",",array(1,2,3),FALSE,0); 
$DataSet->AddAllSeries(); 
$DataSet->SetAbsciseLabelSerie(); 
$DataSet->SetSerieName("January","Serie1"); 
$DataSet->SetSerieName("February","Serie2"); 
$DataSet->SetSerieName("March","Serie3"); 
$DataSet->SetYAxisName("Average age");
$DataSet->SetYAxisUnit("us");

// Initialise the graph 
$Test = new pChart(700,230);
$Test->setFontProperties("Fonts/tahoma.ttf",8); 
$Test->setGraphArea(70,30,680,200); 
$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_NORMAL,150,150,150,TRUE,0,2); 
$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
$Test->drawLineGraph($DataSet->GetData(),$DataSet->GetDataDescription()); 
$Test->drawPlotGraph($DataSet->GetData(),
$DataSet->GetDataDescription(),3,2,255,255,255); 

// Finish the graph 
$Test->setFontProperties("Fonts/tahoma.ttf",8); 
$Test->drawLegend(75,35,$DataSet->GetDataDescription(),255,255,255); 
$Test->setFontProperties("Fonts/tahoma.ttf",10); 
$Test->drawTitle(60,22,"example 1",50,50,50,585); 
$Test->Render("example1.png");

HTML Code

<img src="example1.png" border="0">

Output

Let's create another graphical chart

This time the chart will be generated from array.

$DataSet = new pData;
$DataSet->AddPoint(array(9,9,9,10,10,11,12,14,16,17,18,18,19,
19,18,15,12,10,9),"Serie1");
$DataSet->AddPoint(array(10,11,11,12,12,13,14,15,17,19,22,24,23,
23,22,20,18,16,14),"Serie2");
$DataSet->AddPoint(array(4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,
19,20,21,22),"Serie3");
$DataSet->AddAllSeries();
$DataSet->RemoveSerie("Serie3");
$DataSet->SetAbsciseLabelSerie("Serie3");
$DataSet->SetSerieName("January","Serie1");
$DataSet->SetSerieName("February","Serie2");
$DataSet->SetYAxisName("Temperature");
$DataSet->SetYAxisUnit("°C");
$DataSet->SetXAxisUnit("h");

// Initialise the graph
$Test = new pChart(660,280);
$Test->drawGraphAreaGradient(90,90,90,90,TARGET_BACKGROUND);
$Test->setFixedScale(0,40,4);

// Graph area setup
$Test->setFontProperties("Fonts/pf_arma_five.ttf",6);
$Test->setGraphArea(60,40,640,230);
$Test->drawGraphArea(200,200,200,FALSE);
$Test->drawScale($DataSet->GetData(),$DataSet->GetDataDescription(),
SCALE_NORMAL,200,200,200,TRUE,0,2);
$Test->drawGraphAreaGradient(40,40,40,-50);
$Test->drawGrid(4,TRUE,230,230,230,10);

// Draw the line chart
$Test->setShadowProperties(3,3,0,0,0,30,4);
$Test->drawCubicCurve($DataSet->GetData(),$DataSet->GetDataDescription());
$Test->clearShadow();
$Test->drawPlotGraph($DataSet->GetData(),$DataSet->GetDataDescription(),
3,0,-1,-1,-1,TRUE);

// Write the title
$Test->setFontProperties("Fonts/MankSans.ttf",18);
$Test->setShadowProperties(1,1,0,0,0);
$Test->drawTitle(0,0,"Average temperatures",255,255,255,700,30,TRUE);
$Test->clearShadow();

// Draw the legend
$Test->setFontProperties("Fonts/tahoma.ttf",8);
$Test->drawLegend(580,5,$DataSet->GetDataDescription(),0,0,0,0,0,0,255,
255,255,FALSE);

// Render the picture
$Test->Render("example25.png")

Output:

Click on the following download link to get more examples.