<?php
require_once('svg_graphics.php');
define("pi",3.14159265358979323846264338327950288419716939937510);
$data  = array (
                  'dimens' => "300x300",
                  
                  'func'   => '100*sin(8*x)',
                  'step'   => pi,  //please use pi for polar coordinates
                  'brush_color'  => 'red',
                  'system'       => 'polar',   // you can use polar or cartesian
                  'brush_width'  => 0.2
               );
$graph = new svg_graph($data);
$graph->render_graph();
?>