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我遇到了 pChart 图像渲染的问题，图表图像没有显示在我的生产服务器的屏幕上，而相同的脚本在开发服务器上运行良好。

甚至，我已经检查并比较了两台服务器的配置，它们几乎相同。只有在一种情况下，当我重新启动我的产品服务器时，图像在生产服务器上以相同的脚本显示，但经过一段时间后它无法自动工作。我不知道它的根本原因是什么。

请帮助解决这个问题。下面是代码截图：

<?php   
/* CAT:Area 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();  

for($i=0;$i<=30;$i++) { $MyData->addPoints(rand(1,15),"Probe 1"); }
$MyData->setSerieTicks("Probe 2",4);
$MyData->setAxisName(0,"Temperatures");

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

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

/* Add a border to the picture */
$myPicture->drawGradientArea(0,0,700,230,DIRECTION_VERTICAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>100));
$myPicture->drawGradientArea(0,0,700,230,DIRECTION_HORIZONTAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>20));

/* 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,"GridAlpha"=>100,"DrawSubTicks"=>TRUE,"CycleBackground"=>TRUE);
$myPicture->drawScale($scaleSettings);

/* Write the chart legend */
$myPicture->drawLegend(640,20,array("Style"=>LEGEND_NOBORDER,"Mode"=>LEGEND_HORIZONTAL));

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

/* Enable shadow computing */
$myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>10));

/* Draw the area chart */
$Threshold = "";
$Threshold[] = array("Min"=>0,"Max"=>5,"R"=>187,"G"=>220,"B"=>0,"Alpha"=>100);
$Threshold[] = array("Min"=>5,"Max"=>10,"R"=>240,"G"=>132,"B"=>20,"Alpha"=>100);
$Threshold[] = array("Min"=>10,"Max"=>20,"R"=>240,"G"=>91,"B"=>20,"Alpha"=>100);
$myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>20));
$myPicture->drawAreaChart(array("Threshold"=>$Threshold));

/* Draw a line chart over */
$myPicture->drawLineChart(array("ForceColor"=>TRUE,"ForceR"=>0,"ForceG"=>0,"ForceB"=>0));

/* Draw a plot chart over */
$myPicture->drawPlotChart(array("PlotBorder"=>TRUE,"BorderSize"=>1,"Surrounding"=>-255,"BorderAlpha"=>80));

/* Write the thresholds */
$myPicture->drawThreshold(5,array("WriteCaption"=>TRUE,"Caption"=>"Warn Zone","Alpha"=>70,"Ticks"=>2,"R"=>0,"G"=>0,"B"=>255));
$myPicture->drawThreshold(10,array("WriteCaption"=>TRUE,"Caption"=>"Error Zone","Alpha"=>70,"Ticks"=>2,"R"=>0,"G"=>0,"B"=>255));

/* Render the picture (choose the best way) */
//$myPicture->autoOutput("pictures/example.drawAreaChart.threshold.png");
$myPicture->stroke();
?>

不显示如下截图所示的图像：

在此处输入图像描述

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1 回答 1

0

这个问题经过深入调查后得到解决。我已在class/pImage.class.php 中将imagepng()替换为imagejpeg()。我在下面的 2 个地方将 imagepng() 替换为 imagejpeg() 函数，给出了描述：

1) 在渲染函数中

function render($FileName)
    {
     if ( $this->TransparentBackground ) { imagealphablending($this->Picture,false); imagesavealpha($this->Picture,true); }
     imagejpeg($this->Picture,$FileName);
    }

2) 在行程功能中

 function stroke($BrowserExpire=FALSE)
    {
     if ( $this->TransparentBackground ) { imagealphablending($this->Picture,false); imagesavealpha($this->Picture,true); }

     if ( $BrowserExpire )
      {
       header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
       header("Cache-Control: no-cache");
       header("Pragma: no-cache");
      }

     header('Content-type: image/png');
     imagejpeg($this->Picture);
    }
于 2020-04-28T17:19:56.827 回答