Построение графика в php с помощью библиотеки pChart

PHP:

1. <?php
2. /* Include the pData class */
3. include 'pChart/pData.class';
4. include 'pChart/pCache.class';
5. include 'pChart/pChart.class';
6.  
7. //создаем объект данных
8. $myData = new pData();
9.  
10. /* Коннектимся к MySQL базе данных */
11. $db = mysql_connect("host", "smct", "*******");
12. if ( $db == "" ) { echo " DB Connection error...\r\n"; exit(); }
13.  
14. mysql_select_db("dle",$db);
15.  
16. $Requete = "SELECT `timeStamp`,`quantity` FROM `table` ";
17. $result  = mysql_query($Requete,$db);
18. while ($row = mysql_fetch_array($result))
19. {
20.   $DataSet->AddPoint($row["timeStamp"],"timeStamp");
21.   $DataSet->AddPoint($row["quantity"],"quantity");  
22. }
23.  
24.  
25.  
26. $myData->SetAbsciseLabelSerie("timeStamp");
27.  
28. $myData->AddSerie("quantity");
29.  
30. $myData->SetSerieName(
31. mb_convert_encoding("quantity",'utf-8','windows-1251'),
32. "quantity");
33.  
34. $graph = new pChart(1000,500);
35. $graph->setFontProperties("Intro-Bold.ttf",10);
36.  
37. $graph->setGraphArea(85,30,950,400);
38.  
39. $graph->drawFilledRoundedRectangle(7,7,993,493,5,240,
40. 240,240);
41.  
42. $graph->drawRoundedRectangle(5,5,995,495,5,230,
43. 230,230);
44.  
45. $graph->drawGraphArea(255,255,255,TRUE);
46.  
47. $graph->drawScale($myData->GetData(),
48. $myData->GetDataDescription(),
49. SCALE_NORMAL,150,150,150,true,0,2);
50.  
51. $graph->drawGrid(4,TRUE,230,230,230,50);
52.  
53. $graph->drawLineGraph($myData->GetData(),
54. $myData->GetDataDescription());
55. $graph->drawPlotGraph($myData->GetData(),
56. $myData->GetDataDescription(),3,2,255,255,255);
57.  
58. $graph->setFontProperties("Intro-Bold.ttf",10);
59. $graph->drawTextBox(870,450,990,460,"Powered By pChart",
60. 0,250,250,250,ALIGN_CENTER,TRUE,-1,-1,-1,30);
61. $graph->drawTextBox(805,470,990,480,"http://pchart.sourceforge.net",
62. 0,250,250,250,ALIGN_CENTER,TRUE,-1,-1,-1,30);
63. $graph->drawTextBox(15,450,140,460,"Developed By kv4nt",
64. 0,250,250,250,ALIGN_CENTER,TRUE,-1,-1,-1,30);
65. $graph->drawTextBox(10,470,140,480,"http://www.piarcom.com",
66. 0,250,250,250,ALIGN_CENTER,TRUE,-1,-1,-1,30);
67. $graph->drawLegend(90,35,$myData->GetDataDescription(),255,255,255);
68.  
69. $graph->setFontProperties("Intro-Bold.ttf",10);
70. $graph->drawTitle(480,22,
71. mb_convert_encoding("График",
72. 'utf-8','windows-1251'),
73. 50,50,50,-1,-1,true);
74.  
75. $graph->Stroke();
76. /**
77. * @return array
78. */
79.  
80. ?>

Пытаюсь построить график по данным из БД, не пойму почему не строится линия графика. Помогите пожлста.