Question

我尝试用pchart创建一个图表，我在这个链接中做了（在官方网站上）：

https://wiki.pchart.net/doc.mysql.integration.html

但每次我都会收到此错误!!

致命错误：在第39行的C：\ xampp \ htdocs \ pChart2.1.0 \ examples \ test2.php中的非对象上调用成员函数addPoints（）

帮助!!

这是我的完整代码：

     /* CAT:Line chart */

 /* pChart library inclusions */
 include("../class/pData.class.php");
 include("../class/pDraw.class.php");
 include("../class/pImage.class.php");

 /* Create and populate the pData object */
 $MyData = new pData();  

 /* Connect to the MySQL database */
$db = mysql_connect("localhost", "root", "");
mysql_select_db("pchart",$db);


/* Build the query that will returns the data to graph */
$Requete = "SELECT * FROM `measures`";
$Result = mysql_query($Requete,$db);
while($row = mysql_fetch_array($Result))
{
/* Push the results of the query in an array */
$timestamp[] = $row["timestamp"];
$temperature[] = $row["temperature"];
$humidity[] = $row["humidity"];



}
/* Save the data in the pData array */
$myData->addPoints($timestamp,"Timestamp");
$myData->addPoints($temperature,"Temperature");
$myData->addPoints($humidity,"Humidity");

 /* Create the pChart object */
 $myPicture = new pImage(700,230,$MyData);

 /* Turn of Antialiasing */
 $myPicture->Antialias = FALSE;

 /* Add a border to the picture */
 $myPicture->drawRectangle(0,0,699,229,array("R"=>0,"G"=>0,"B"=>0));

 /* Write the chart title */ 
 $myPicture->setFontProperties(array("FontName"=>"../fonts/Forgotte.ttf","FontSize"=>11));
 $myPicture->drawText(150,35,"Average temperature",array("FontSize"=>20,"Align"=>TEXT_ALIGN_BOTTOMMIDDLE));

 /* Set the default font */
 $myPicture->setFontProperties(array("FontName"=>"../fonts/pf_arma_five.ttf","FontSize"=>6));

 /* Define the chart area */
 $myPicture->setGraphArea(60,40,650,200);

 /* Draw the scale */
 $scaleSettings = array("XMargin"=>10,"YMargin"=>10,"Floating"=>TRUE,"GridR"=>200,"GridG"=>200,"GridB"=>200,"DrawSubTicks"=>TRUE,"CycleBackground"=>TRUE);
 $myPicture->drawScale($scaleSettings);

 /* Turn on Antialiasing */
 $myPicture->Antialias = TRUE;

 /* Draw the line chart */
 $myPicture->drawLineChart();

 /* Write the chart legend */
 $myPicture->drawLegend(540,20,array("Style"=>LEGEND_NOBORDER,"Mode"=>LEGEND_HORIZONTAL));

 /* Render the picture (choose the best way) */
 $myPicture->autoOutput("pictures/example.drawLineChart.simple.png");

非常感谢。

Answer 1

 include("../class/pDraw.class.php");
 include("../class/pImage.class.php");
 include("../class/pData.class.php");
$db = mysql_connect("localhost", "root", "");
mysql_select_db("test",$db);
$query = "SELECT `temperature` FROM `measures`";
$result  = mysql_query($query,$db);
$cpu="";

while($row = mysql_fetch_array($result)) 
{
   $timestamp[] = $row["timestamp"];
   $temperature[] = $row["temperature"];
   $humidity[] = $row["humidity"];
}
$myData = new pData();
$myData->addPoints($timestamp,"Timestamp");
$myData->addPoints($temperature,"Temperature");
$myData->addPoints($humidity,"Humidity");

 $myData->setAbscissa("Timestamp");
 $myData->setSerieOnAxis("Humidity", 1);
 $myData->setXAxisName("Time");
  //$myData->setXAxisDisplay(AXIS_FORMAT_TIME,"H:i");
  $myData->setAxisName(0,"Temperature");
 $myData->setAxisUnit(0,"°C");
 /* Second Y axis will be dedicated to humidity */
 $myData->setAxisName(1,"Humidity");
 $myData->setAxisUnit(0,"%");
$myPicture = new pImage(700,230,$myData); 
$myPicture->setGraphArea(60,40,670,190);
$myPicture->setFontProperties(array("FontName"=>"../fonts/Forgotte.ttf","FontSize"=>15));
$myPicture->drawScale();
$myPicture->drawPlotChart();
$myPicture->Stroke();

Answer 2

使用大写M

将MyData定义为newData

/* Create and populate the pData object */
$MyData = new pData();

并使用它而不使用大写M

$myData->addPoints($timestamp,"Timestamp");
$myData->addPoints($temperature,"Temperature");
$myData->addPoints($humidity,"Humidity");

Answer 3

检查页面是否正确链接到pData.class.php。当它试图调用非对象上的成员函数时，通常会指向该类不可用于执行该工作的页面。如果没有看到具体的代码，就很难提供更多帮助。

Pchart - 从MySQL检索数据

3 个答案: