//This is also why you can't use html in this example.
header("Content-type: image/png");
/*
Include plot.class.php, since we need the file to draw with.
*/
include "plot.class.php";
//Create an instance of Plot
$Plot = new Plot();
//Initialize some fields on the Plot
$Plot->Caption = "Example plot";
//Setting image size
$Plot->Width = 500;
$Plot->Height = 500;
//Setting coordinate space
$Plot->MinX = -250;
$Plot->MaxX = 250;
$Plot->MinY = -250;
$Plot->MaxY = 250;
//Creating an instance of Graph
$G = new Graph();
//Set the expression of the graph to the parameter given via the GET method.
$G->Exp = $_GET["exp"];
//Set the color of the Graph
$G->Color = array(0, 0, 255);
//Set the label of the Graph
$G->Label = "GET graph";
//Add all (in this case only one) instances of Graph to an array and parse to Plot
$Plot->Graphs = array($G);
//Display the final Image, printed as binary png in this file.
$Plot->DisplayPlot();
