Phpdiagram - Function.html - Free PHP Scripts

Function.html:

<HTML>
<HEAD>
<TITLE></TITLE>
</HEAD>
<BODY bgcolor="#eeeeee">
<form name="inputform" method="post" action="dynamic_example.php" onSubmit="return checkForm()">
<TABLE BORDER=0 CELLPADDING=2 CELLSPACING=2 WIDTH=720>
<TR><TD width=40></TD>
 <TD width=50 align=right>x-min:</TD>
 <TD width=80 align=left><input name="xmin" value="-4" size=8></TD>
 <TD width=50 align=right>x-max:</TD>
 <TD width=80 align=left><input name="xmax" value="4" size=8></TD>
 <TD width=50 align=right>y-min:</TD>
 <TD width=80 align=left><input name="ymin" value="-0.2" size=8></TD>
 <TD width=50 align=right>y-max:</TD>
 <TD width=80 align=left><input name="ymax" value="0.5" size=8></TD>
 <TD></TD>
</TR>
<TR><TD align=right>y=</TD>
 <TD colspan=8 align=left><input name="fx" value="1/sqrt(2*PI)*exp(-x*x/2)+sin(PI*x)/10" size=56></TD>
 <TD><input type=button value="Draw"></TD>
</TR>
<TR><TD colspan=10>
<IMG src="function.png">
</TD></TR>
</TABLE>
</form>
<SCRIPT Language="JavaScript">
function checkForm()
{ var xmin=parseFloat(document.inputform.xmin.value);
 var xmax=parseFloat(document.inputform.xmax.value);
 var ymin=parseFloat(document.inputform.ymin.value);
 var ymax=parseFloat(document.inputform.ymax.value);
 if (isNaN(xmin)) { alert("x-min is not a number"); return(false); }
 if (isNaN(xmax)) { alert("x-max is not a number"); return(false); }
 if (isNaN(ymin)) { alert("y-min is not a number"); return(false); }
 if (isNaN(ymax)) { alert("y-max is not a number"); return(false); }
 return(true);
}
</SCRIPT>
<code>
<?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);
 }
 ?>

</code>
</BODY>
</HTML>

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