Intial implementation of class
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136
Gantt.php
136
Gantt.php
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@ -25,11 +25,147 @@ class Gantt {
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**/
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**/
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private $events = array();
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private $events = array();
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/**
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* HTML render of our chart
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* @access private
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* @var string
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**/
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private $html = '';
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/**
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* List of colors to use for events
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* @access private
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* @var array
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**/
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private $colors = array();
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/**
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* Track the number of times we've retrieved colors
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* @access private
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* @var integer
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**/
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private $color_count = 0;
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/**
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/**
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* Constructor
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* Constructor
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**/
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**/
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function __construct() {
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function __construct() {
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//add a default set of colors
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$this->add_color('#FF8080');
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$this->add_color('#99CCFF');
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$this->add_color('#00FF00');
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$this->add_color('#FF9900');
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$this->add_color('#800080');
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}
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/**
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* Add an event to be processed
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* @param string name of the event
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* @param integer the week to start this event
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* @param integer duration
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* @return bool whether or not the event was added successfully
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**/
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public function add_event($event, $start, $duration) {
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// return false if we do not have valid data
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if(!is_int($start)) return false;
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if(!is_int($duration)) return false;
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// add the event
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$this->events[] = (object)array(
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'event' => $event,
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'start' => $start,
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'duration' => $duration,
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);
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// reset the HTML so it is re-rendered next attempt
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$this->html = '';
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return true;
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}
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/**
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* Create an HTML Gantt chart from the current events
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* @return string html for our gantt chart
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**/
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public function render_html() {
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// if we have previously rendered this gantt and have not added
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// new events, we don't need to do it again and can returned the
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// cached html
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if($this->html != '') {
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return $this->html;
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}
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$columns = $this->find_last();
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$this->html = '<table id="gantt">' . "\n";
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// create the header
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$this->html .= ' <tr>' . "\n";
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$this->html .= ' <th>Task</th>' . "\n";
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$this->html .= ' <th>Weeks</th>' . "\n";
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for($i = 1; $i <= $columns; $i++) {
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$this->html .= ' <th>' . $i . '</th>' . "\n";
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}
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$this->html .= ' </tr>' . "\n";
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// add all the rows
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foreach($this->events as $event) {
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$color = $this->get_color();
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$this->html .= ' <tr>' . "\n";
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$this->html .= ' <td>' . $event->event . '</td>' . "\n";
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$this->html .= ' <td>' . $event->duration . '</td>' . "\n";
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for($i = 1; $i <= $columns; $i++) {
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if($i >= $event->start && $i < ($event->start + $event->duration)) {
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$style = ' style="background-color:' . $color . '"';
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} else {
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$style = ' style="background-color:#fff"';
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}
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$this->html .= ' <td class="colored"'. $style .'> </td>' . "\n";
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}
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$this->html .= ' </tr>' . "\n";
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}
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$this->html .= '</table>' . "\n";
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return $this->html;
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}
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/**
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* Find the last column in our Gantt chart
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* @return integer last column
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**/
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private function find_last() {
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$last = 0;
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foreach($this->events as $event) {
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$end = $event->start + $event->duration - 1;
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$last = ($end > $last) ? $end : $last;
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}
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return $last;
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}
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/**
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* Add a color to our list
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* @param string hexadecimal color code
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* @return bool whether or not the color was added
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**/
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public function add_color($color) {
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// the color was not properly formatted
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if(preg_match('/^#(?:[0-9a-fA-F]{3}){1,2}$/',$color) == 0) return false;
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// color is already in the list
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if(in_array($color,$this->colors)) return false;
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$this->colors[] = $color;
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return true;
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}
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/**
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* Get a color to use
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* @param integer the number of times this function has been called
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* @return string color code
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**/
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private function get_color() {
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return $this->colors[++$this->color_count % count($this->colors)];
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}
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}
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}
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}
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?>
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?>
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