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khosb/includes/pear/Image/docs/examples/vector_function.php

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<?php
/**
* Usage example for Image_Graph.
*
* Main purpose:
* Demonstrate vector function data
*
* Other:
* Setting axis intersection
*
* $Id: vector_function.php,v 1.4 2005/08/03 21:21:52 nosey Exp $
*
* @package Image_Graph
* @author Jesper Veggerby <pear.nosey@veggerby.dk>
*/
require_once 'Image/Graph.php';
// create the graph
$Graph =& Image_Graph::factory('graph', array(400, 300));
// add a TrueType font
$Font =& $Graph->addNew('font', 'Verdana');
// set the font size to 11 pixels
$Font->setSize(8);
$Graph->setFont($Font);
$Graph->add(
Image_Graph::vertical(
Image_Graph::factory('title', array('Vector Function Chart Sample', 12)),
Image_Graph::vertical(
// create the plotarea with a normal linear axis as x-axis!
$Plotarea = Image_Graph::factory('plotarea', 'axis'),
$Legend = Image_Graph::factory('legend'),
90
),
5
)
);
$Legend->setPlotarea($Plotarea);
function tcost($t) { return $t*cos($t); }
function tsint($t) { return $t*sin($t); }
$GridX =& $Plotarea->addNew('line_grid', null, IMAGE_GRAPH_AXIS_X);
$GridY =& $Plotarea->addNew('line_grid', null, IMAGE_GRAPH_AXIS_Y);
$LineStyle =& Image_Graph::factory('Image_Graph_Line_Dashed', array('lightgrey', 'transparent'));
$GridX->setLineStyle($LineStyle);
$GridY->setLineStyle($LineStyle);
$Dataset =& Image_Graph::factory('vector', array(0, 20, 'tcost', 'tsint', 200));
// create the 1st plot as smoothed area chart using the 1st dataset
$Plot =& $Plotarea->addNew('line', array(&$Dataset));
$Plot->setLineColor('red');
$Plot->setTitle('f(t) = { t*cos(t), t*sin(t) }');
$AxisY =& $Plotarea->getAxis(IMAGE_GRAPH_AXIS_Y);
$AxisY->setAxisIntersection(0);
$Graph->done();
?>