JpGraph中条形图上的覆盖文本

我正在使用JpGraph为约定制作甘特图。我在页面底部找到了这个例子，我正试图将其更改为我需要显示的内容。我可以将leftMark设置在我希望文本出现的栏的一侧。但是，文本不在栏中。我试图将对齐方式更改为"left, top"，但收到错误$bar->leftMark->title->SetTextAlign('left','top');

致命错误：调用中未定义的方法Text:：SetTextAlign（）C： 第82行上的''axamplep''htdocs''ganttChart''chart.php

或者对图形没有影响。

请看我的例子，我能够用这个图做什么：例子。

问题：

1. 为了完成此任务，我缺少哪些类、包含或代码？

2. 你知道我可以遵循的一个例子吗？上面的段落和例子中描述了这个例子，它具有与我想要的效果相同的效果？

PHP代码：

<?php // content="text/plain; charset=utf-8"
// Gantt hour example
require_once ('jpgraph/src/jpgraph.php');
require_once ('jpgraph/src/jpgraph_gantt.php');
require_once ('jpgraph/src/jpgraph_canvas.php');
require_once ('jpgraph/src/jpgraph_canvtools.php');
require_once ('jpgraph/src/jpgraph_text.inc.php');

// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);
// Reporting E_NOTICE can be good too (to report uninitialized
// variables or catch variable name misspellings ...)
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
// Report all errors except E_NOTICE
// This is the default value set in php.ini
error_reporting(E_ALL ^ E_NOTICE);
// Report all PHP errors (see changelog)
error_reporting(E_ALL);
// Report all PHP errors
error_reporting(-1);
// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
$graph = new GanttGraph();
$graph->SetMarginColor('blue:1.7');
$graph->SetColor('white');
$graph->SetBackgroundGradient('navy','white',GRAD_HOR,BGRAD_MARGIN);
$graph->scale->hour->SetBackgroundColor('lightyellow:1.5');
$graph->scale->hour->SetFont(FF_FONT1);
$graph->scale->day->SetBackgroundColor('lightyellow:1.5');
$graph->scale->day->SetFont(FF_FONT1,FS_BOLD);
$graph->title->Set("Example of hours in scale");
$graph->title->SetColor('white');
$graph->title->SetFont(FF_VERDANA,FS_BOLD,14);
$graph->ShowHeaders(GANTT_HDAY | GANTT_HHOUR);
$graph->scale->week->SetStyle(WEEKSTYLE_FIRSTDAY);
$graph->scale->week->SetFont(FF_FONT1);
$graph->scale->hour->SetIntervall(1);
$graph->scale->hour->SetStyle(HOURSTYLE_HM24);
$graph->scale->day->SetStyle(DAYSTYLE_SHORTDAYDATE3);
$data = array(
    array(0,"Room 1", "2001-01-26 04:30","2001-01-26 14:00"),
    array(0,"Room 1", "2001-01-26 15:30","2001-01-26 19:00"),
    array(1,"Room 2", "2001-01-26 10:00","2001-01-26 18:00"),
    array(2,"Room 3", "2001-01-26","2001-01-27 10:00")
);

for($i=0; $i<count($data); ++$i) {
    $bar = new GanttBar(
    $data[$i][0],
    $data[$i][3],
    $data[$i][2],
    $data[$i][3],
    "",100);
    if( count($data[$i])>4 )
    $bar->title->SetFont($data[$i][4],$data[$i][5],$data[$i][6] );
    $bar->SetPattern(BAND_RDIAG,"yellow");
    $bar->SetFillColor("red");
    //$bar->SetTextAlign('left');
    $bar->leftMark->Show();    
    //$bar->rightMark->title->Set("Events name");
    $bar->leftMark->title->Set("Events name");
    //$bar->rightMark->SetType(MARK_FILLEDCIRCLE);
    //$bar->rightMark->SetWidth(10);
    //$bar->rightMark->SetColor("red");
    //$bar->rightMark->SetFillColor("red");
    //$bar->leftMark->title->SetTextAlign('left');
    $bar->leftMark->title->Center(50,150,75);
    $bar->leftMark->title->SetFont(FF_ARIAL,FS_BOLD,12);
    $bar->leftMark->title->SetColor("black");
    $bar->leftMark->title->SetAlign('left','top');
    $graph->Add($bar);
}

$graph->Stroke();

?>

<?php // content="text/plain; charset=utf-8"
// Gantt hour example
require_once ('jpgraph/src/jpgraph.php');
require_once ('jpgraph/src/jpgraph_gantt.php');
require_once ('jpgraph/src/jpgraph_canvas.php');
require_once ('jpgraph/src/jpgraph_canvtools.php');
require_once ('jpgraph/src/jpgraph_text.inc.php');

// Report simple running errors
error_reporting(E_ERROR | E_WARNING | E_PARSE);
// Reporting E_NOTICE can be good too (to report uninitialized
// variables or catch variable name misspellings ...)
error_reporting(E_ERROR | E_WARNING | E_PARSE | E_NOTICE);
// Report all errors except E_NOTICE
// This is the default value set in php.ini
error_reporting(E_ALL ^ E_NOTICE);
// Report all PHP errors (see changelog)
error_reporting(E_ALL);
// Report all PHP errors
error_reporting(-1);

// Same as error_reporting(E_ALL);
ini_set('error_reporting', E_ALL);
$graph = new GanttGraph();
$graph->SetMarginColor('blue:1.7');
$graph->SetColor('white');
$graph->SetBackgroundGradient('navy','white',GRAD_HOR,BGRAD_MARGIN);
$graph->scale->hour->SetBackgroundColor('lightyellow:1.5');
$graph->scale->hour->SetFont(FF_FONT1);
$graph->scale->day->SetBackgroundColor('lightgreen:1.5');
$graph->scale->day->SetFont(FF_FONT1,FS_BOLD);
$graph->title->Set("Example of hours in scale");
$graph->title->SetColor('white');
$graph->title->SetFont(FF_VERDANA,FS_BOLD,14);
$graph->ShowHeaders(GANTT_HDAY | GANTT_HHOUR);
$graph->scale->week->SetStyle(WEEKSTYLE_FIRSTDAY);
$graph->scale->week->SetFont(FF_FONT1);
$graph->scale->hour->SetIntervall(1);
$graph->scale->hour->SetStyle(HOURSTYLE_HMAMPM);
$graph->scale->hour->grid->SetColor('lightgray');
$graph->scale->day->SetStyle(DAYSTYLE_SHORTDAYDATE3);

$data = array(
    array(0,"Room 1", "2001-01-26 02:30","2001-01-26 14:00:00","Sonic"),
    array(0,"Room 1", "2001-01-26 15:30","2001-01-26 19:00","SailorMoon"),
    array(1,"Room 2", "2001-01-26 10:00","2001-01-26 18:00","Gundam Wing"),
    array(2,"Room 3", "2001-01-26","2001-01-26 10:00","No appologies")
);

for($i=0; $i<count($data); ++$i) {
$txt = new Text();
$txt->SetScalePos($data[$i][2],$data[$i][0]);
$txt->SetMargin(50);
$txt->SetFont(FF_VERDANA,FS_BOLD,12);
$txt->SetAlign('left','center');
$txt->Set($data[$i][4]);
$txt->SetParagraphAlign('left');
//$txt->SetWordWrap(10);
$txt->SetBox('lightyellow');
$txt->SetShadow();
$graph->Add($txt); 

    $bar = new GanttBar(
    $data[$i][0],
    $data[$i][1],
    $data[$i][2],
    $data[$i][3],
    $data[$i][4],100);
    if( count($data[$i])>4 )
    $bar->title->SetFont($data[$i][4],$data[$i][5],$data[$i][6] );
    $bar->title->SetFont(FF_VERDANA,FS_BOLD,12);
    $bar->SetPattern(BAND_RDIAG,"yellow");
    $bar->SetFillColor("red");
    $graph->Add($bar);
}
$graph->Stroke();
?>