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我使用 Libchart 为我的数据库中的数据绘制曲线。我的问题是：我的空数据（Y 轴值）的 Libchart 图（零值）。当 Y 为空时，我需要 Libchart 绘制（X 轴值）但不为（Y 轴值）绘制曲线。换句话说，我需要为空值省略曲线，然后继续绘制实际值。下面是我用来绘制曲线的代码：

<?php
$x1="Value 1";
$x2="Value 2";
$x3="Value 3";
$x4="Value 4";
$x5="Value 5";
$x6="Value 6";
$x7="Value 7";
$x8="Value 8";
$x9="Value 9";
$x10="Value 10";
$x11="Value 11";
$x12="Value 12";


$y1=45;
$y2=06;
$y3=82;
$y4=15;
$y5=45;
$y6=null;
$y7=null;
$y8=null;
$y9=null;
$y10=75;
$y11=16;
$y12=34;

    include "libchart/classes/libchart.php";
    $chart = new LineChart(1000, 400);

    $dataSet = new XYDataSet();
    $dataSet->addPoint(new Point($x1,$y1));
    $dataSet->addPoint(new Point($x2,$y2));
    $dataSet->addPoint(new Point($x3,$y3));
    $dataSet->addPoint(new Point($x4,$y4));
    $dataSet->addPoint(new Point($x5,$y5));
    $dataSet->addPoint(new Point($x6,$y6));
    $dataSet->addPoint(new Point($x7,$y7));
    $dataSet->addPoint(new Point($x8,$y8));
    $dataSet->addPoint(new Point($x9,$y9));
    $dataSet->addPoint(new Point($x10,$y10));
    $dataSet->addPoint(new Point($x11,$y11));
    $dataSet->addPoint(new Point($x12,$y12));
    $chart->setDataSet($dataSet);
    $chart->setTitle("Monthly usage for www.example.com");
    $chart->render("generated/demo1.png");


?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-15" />
</head>
<body>
<center><img alt="my_curve" src="generated/demo1.png" style="border: 1px solid gray;"/></center>
</body>
</html>
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