Biorhythm (Example for PHP+GD)

by Till Gerken
http://www.zend.com/zend/tut/dynamic.php

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<?php
	include("langsettings.php");

// Biorhythm by Till Gerken
	// http://www.zend.com/zend/tut/dynamic.php
	//
	// Multi-language support by Kai Oswald Seidler, 2003
	//
	// Print a standard page header
	//
	function pageHeader()
	{
	    global $TEXT;

print("<html><head>");
	    print("<title>Biorhythm with PHP</title>");
	    print('<link href="xampp.css" rel="stylesheet" type="text/css">');
	    print("</head><body>");
		
	    print("&nbsp;<p><h1>".$TEXT['bio-head']."</h1>");
	    print($TEXT['bio-by']." Till Gerken<br><a class=black href=http://www.zend.com/zend/tut/dynamic.php>http://www.zend.com/zend/tut/dynamic.php</a><p>");

}

//
	// Print a standard page footer
	//
	function pageFooter()
	{

include("lang/".file_get_contents("lang.tmp").".php"); 
	    include("showcode.php");

print("</body></html>");

}

//
	// Function to draw a curve of the biorythm
	// Parameters are the day number for which to draw,
	// period of the specific curve and its color
	//
	function drawRhythm($daysAlive, $period, $color)
	{
	    global $daysToShow, $image, $diagramWidth, $diagramHeight;

// get day on which to center
	    $centerDay = $daysAlive - ($daysToShow / 2);

// calculate diagram parameters
	    $plotScale = ($diagramHeight - 25) / 2;
	    $plotCenter = ($diagramHeight - 25) / 2;

// draw the curve
	    for($x = 0; $x <= $daysToShow; $x++)
	    {
		// calculate phase of curve at this day, then Y value
		// within diagram
		$phase = (($centerDay + $x) % $period) / $period * 2 * pi();
		$y = 1 - sin($phase) * (float)$plotScale + (float)$plotCenter;

// draw line from last point to current point
		if($x > 0)
		    imageLine($image, $oldX, $oldY,
			      $x * $diagramWidth / $daysToShow, $y, $color);

// save current X/Y coordinates as start point for next line
		$oldX = $x * $diagramWidth / $daysToShow;
		$oldY = $y;
	    }

}

//
	// ---- MAIN PROGRAM START ----

// check if we already have a date to work with,
	// if not display a form for the user to enter one
	if(!isset($_REQUEST['birthdate']))
	{
	    pageHeader();

?>
	     <form method="get" action="biorhythm.php">
	     
	     <?=$TEXT['bio-ask']?>:
		<br>
	     <input type="text" name="birthdate" value="MM/DD/YYYY"><p>
	     <input type=submit value="<?=$TEXT['bio-ok']?>">
	     <input type="hidden" name="showpng" value=1>
	     </form>
	    <?php

pageFooter();

exit();
	}

// get different parts of the date
	$birthMonth = substr($_REQUEST['birthdate'], 0, 2);
	$birthDay = substr($_REQUEST['birthdate'], 3, 2);
	$birthYear = substr($_REQUEST['birthdate'], 6, 4);

// check date for validity, display error message if invalid
	if(!checkDate($birthMonth, $birthDay, $birthYear))
	{
	    pageHeader();

//print("The date '$birthMonth/$birthDay/$birthYear' is invalid.");
	    print("<h2>".$TEXT['bio-error1']." '$birthMonth/$birthDay/$birthYear' ".$TEXT['bio-error2'].".</h2>");

pageFooter();

exit();
	}

if(@$_REQUEST['showpng']==1)
	{
	    pageHeader();
	
	    echo "<img src=\"biorhythm.php?birthdate=".urlencode($_REQUEST['birthdate'])."\">";
	    pageFooter();
	    exit();
	}
	// specify diagram parameters (these are global)
	$diagramWidth = 710;
	$diagramHeight = 400;
	$daysToShow = 30;

// calculate the number of days this person is alive
	// this works because Julian dates specify an absolute number
	// of days -> the difference between Julian birthday and
	// "Julian today" gives the number of days alive
	$daysGone = abs(gregorianToJD($birthMonth, $birthDay, $birthYear)
			- gregorianToJD(date( "m"), date( "d"), date( "Y")));

// create image
	$image = imageCreate($diagramWidth, $diagramHeight);

// allocate all required colors
	$colorBackgr       = imageColorAllocate($image, 192, 192, 192);
	$colorForegr       = imageColorAllocate($image, 255, 255, 255);
	$colorGrid         = imageColorAllocate($image, 0, 0, 0);
	$colorCross        = imageColorAllocate($image, 0, 0, 0);
	$colorPhysical     = imageColorAllocate($image, 0, 0, 255);
	$colorEmotional    = imageColorAllocate($image, 255, 0, 0);
	$colorIntellectual = imageColorAllocate($image, 0, 255, 0);

// clear the image with the background color
	imageFilledRectangle($image, 0, 0, $diagramWidth - 1, $diagramWidth - 1, $colorBackgr);

// calculate start date for diagram and start drawing
	$nrSecondsPerDay = 60 * 60 * 24;
	$diagramDate = time() - ($daysToShow / 2 * $nrSecondsPerDay)
		       + $nrSecondsPerDay;

for ($i = 1; $i < $daysToShow; $i++)
	{
	    $thisDate = getDate($diagramDate);
	    $xCoord = ($diagramWidth / $daysToShow) * $i;

// draw day mark and day number
	    imageLine($image, $xCoord, $diagramHeight - 25, $xCoord,
		      $diagramHeight - 20, $colorGrid);
	    imageString($image, 3, $xCoord - 5, $diagramHeight - 16,
			$thisDate[ "mday"], $colorGrid);

$diagramDate += $nrSecondsPerDay;
	}

// draw rectangle around diagram (marks its boundaries)
	imageRectangle($image, 0, 0, $diagramWidth - 1, $diagramHeight - 20,
		       $colorGrid);

// draw middle cross
	imageLine($image, 0, ($diagramHeight - 20) / 2, $diagramWidth,
		  ($diagramHeight - 20) / 2, $colorCross);
	imageLine($image, $diagramWidth / 2, 0, $diagramWidth / 2, $diagramHeight - 20,
		  $colorCross);

// print descriptive text into the diagram
	imageString($image, 3, 10, 10,  $TEXT['bio-birthday'].": $birthDay.$birthMonth.$birthYear",
		    $colorCross);
	imageString($image, 3, 10, 26,  $TEXT['bio-today'].":    ".  date(  "d.m.Y"),  $colorCross);
	imageString($image, 3, 10, $diagramHeight - 42,  $TEXT['bio-physical'], $colorPhysical);
	imageString($image, 3, 10, $diagramHeight - 58,  $TEXT['bio-emotional'], $colorEmotional);
	imageString($image, 3, 10, $diagramHeight - 74,  $TEXT['bio-intellectual'], $colorIntellectual);

// now draw each curve with its appropriate parameters
	drawRhythm($daysGone, 23, $colorPhysical);
	drawRhythm($daysGone, 28, $colorEmotional);
	drawRhythm($daysGone, 33, $colorIntellectual);

// set the content type
	header("Content-type:  image/png");

// create an interlaced image for better loading in the browser
	imageInterlace($image, 1);

// mark background color as being transparent
	imageColorTransparent($image, $colorBackgr);

// now send the picture to the client (this outputs all image data directly)
	imagePNG($image);