Function.php:
<?PHP
//function.php
include ("diagram.php");
$xmin=(isset($_REQUEST['xmin'])) ? $_REQUEST['xmin'] : "";
$xmax=(isset($_REQUEST['xmax'])) ? $_REQUEST['xmax'] : "";
$ymin=(isset($_REQUEST['ymin'])) ? $_REQUEST['ymin'] : "";
$ymax=(isset($_REQUEST['ymax'])) ? $_REQUEST['ymax'] : "";
$fx=(isset($_REQUEST['fx'])) ? $_REQUEST['fx'] : "";
if (($xmin!="")&&($xmax!="")&&($ymin!="")&&($ymax!="")&&($fx!=""))
{ $D=new Diagram();
$D->Img=@ImageCreate(720, 400) or die("Cannot create a new GD image.");
ImageColorAllocate ($D->Img, 255, 255, 255);
$D->SetFrame(60, 40, 700, 340);
$D->SetBorder($xmin, $xmax, $ymin, $ymax);
$D->SetText("", "", "f(x)=".$fx);
$D->SetGridColor("#FFFFFF", "#EEEEEE");
$D->Draw("#DDDDDD", "#000000", false);
$fx=strtolower($fx);
$fx=str_replace('exp', 'e*p', $fx);
$fx=str_replace('x', '($x)', $fx);
$fx=str_replace('e*p', 'exp', $fx);
$fx=str_replace('pi()', 'pi', $fx);
$fx=str_replace('pi', 'pi()', $fx);
$y=0;
for ($i=60; $i<=700; $i++)
{ $x = $D->RealX($i);
eval ("\$y = ".$fx.";");
if (($ymin<=$y)&&($y<=$ymax))
$D->Pixel($i, $D->ScreenY($y), "#0000FF");
}
header("Content-type: image/png");
ImagePng($D->Img);
ImageDestroy($D->Img);
}
?>
Other Graphs And Charts Scripts:
