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POGD PHP dynamic pie chart generation issue
 

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  1. POGD PHP dynamic pie chart generation issue
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    <p>I've created a dynamic pie chart with the GD extension using the image filled arc function. I pass to this script, via HTTP GET variables, up to 11 values. the first value, n, is the number of values that follow. n1,n2,n3, etc. are the data itself. These are integer precentages. The goal is to make a chart that will show the percentages in a pie chart in graphical form. </p> <p>When I run this as:</p> <p>piechart.php?n=2&amp;n1=20&amp;n2=80</p> <p>I only get a black box. Any ideas? Any questions please ask - thanks!</p> <pre><code>&lt;?php // var load $size=500; //HTTP GET vars: //N is the number of sections we have //n1 is the percentage for part1 //n2 is the percentage for part2, and so on $num=$_GET["n"]; //want to make a hard limit at 10 different sections $num=min($num,10); $percents; $angles; $angles[0]=0; $percents[0]=NULL; //load percents array. First value is NULL for ($c=1;$c&lt;=$num;$c++) { $percents[$c]=(int)$_GET["n".$c]; $angles[$c]=(int)round((($percents[$c-1]+$percents[$c])/100)*360); } $angles[$num]=360; //create image $half=round($size/2); $image = imagecreatetruecolor($size, $size); // colors $colorR=array(0x00, 0x00, 0xFF, 0xFF, 0xFF, 0x74, 0x33, 0xFF, 0x33, 0x66); $colorG=array(0x00, 0x80, 0x00, 0xA5, 0xFF, 0xFF, 0x99, 0x00, 0x33, 0xFF); $colorB=array(0xFF, 0x00, 0x00, 0x00, 0x00, 0xD4, 0xFF, 0x66, 0x99, 0x33); // shaded colors $darkColorR=array(0x00, 0x00, 0x80, 0x80, 0x80, 0x3A, 0x1A, 0x80, 0x1A, 0x33); $darkColorG=array(0x00, 0x40, 0x00, 0x52, 0x80, 0x80, 0x4C, 0x00, 0x1A, 0x80); $darkColorB=array(0x80, 0x00, 0x00, 0x00, 0x00, 0x6A, 0x80, 0x33, 0x4C, 0x1A); $white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF); $black = imagecolorallocate($image, 0x00, 0x00, 0x00); // make the 3D effect $tempDarkColor; for ($i = $half+round(.1*$half); $i &gt; $half; $i--) { for ($j=0;$j&lt;(count($angles)-1)&amp;&amp;$angles[$j]&lt;180;$j++) { if ($darkColorR[$j]==NULL||$darkColorG[$j]==NULL||$darkColorB[$j]==NULL) { //if one of the colors is missing, set the entire color to white $darkColorR[$j]=0x00; $darkColorG[$j]=0x00; $darkColorB[$j]=0x00; } $tempDarkColor[$j]= imagecolorallocate($image, $darkColorR[$j],$darkColorG[$j],$darkColorB[$j]); imagefilledarc($image, $half, $i, $size, $half, $angles[$j], $angles[$j+1] , $tempDarkColor[$j], IMG_ARC_PIE); } } //make the image $imageColor; for ($k=0;$k&lt;(count($angles)-1);$k++) { if ($darkColorR[$k]==NULL||$darkColorG[$k]==NULL||$darkColorB[$k]==NULL) { //if one of the colors is missing, set the entire color to white $colorR[$k]=0x00; $colorG[$k]=0x00; $colorB[$k]=0x00; } $tempColor[$k]= imagecolorallocate($image, $darkColorR[$k],$darkColorG[$k],$darkColorB[$k]); imagefilledarc($image, $half, $half, $size, $half, $angles[$k], $angles[$k+1] , $tempColor[$k], IMG_ARC_PIE); } // flush image header('Content-type: image/png'); imagepng($image); imagedestroy($image); ?&gt; </code></pre>
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