Is there a certain limit to how much data pchart can handle? I'm pulling from a DB that has about 700k rows . Maybe someone can help this newb about and look over the code?
Code:
<?php
/* 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 `power_trend_circuit`";
$Result = mysql_query($Requete,$db);
while($row = mysql_fetch_array($Result))
{
/* Get the data from the query result */
$timestamp = $row["circuit"];
$data = $row["reading_value"];
}
/* Save the data in the pData array */
$myData->addPoints($timestamp,"Timestamp");
$myData->addPoints($data,"Value");
/* Put the timestamp column on the abscissa axis */
$myData->setAbscissa("Timestamp");
/* Name this axis "Time" */
$myData->setXAxisName("Time");
/* Specify that this axis will display time values */
$myData->setXAxisDisplay(AXIS_FORMAT_TIME,"H:i");
/* First Y axis will be dedicated to the temperatures */
$myData->setAxisName(0,"Temperature");
$myData->setAxisUnit(0,"grC");
/* 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"=>"pchart/fonts/Forgotte.ttf","FontSize"=>11));
$myPicture->drawText(150,35,"Average temperature",array("FontSize"=>20,"Align"=>TEXT_ALIGN_BOTTOMM$
/* Set the default font */
$myPicture->setFontProperties(array("FontName"=>"pchart/fonts/pf_arma_five.ttf","FontSize$"=>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("pchart/examples/pictures/example.drawLineChart.simple.png");
?>
