Geocache rotating image

map_script.php

<?php
// File and rotation
$overFilename 	= 'Map_Plain.png';	// this is the file that goes over top
$underFilename	= 'Map_Gat.png';		//  the underneath image

// calculate the rotation
//$degrees = $_GET["angle"];
if (date("G") < 5)
{$hr = (date("G") + 24);}
else {$hr = (date("G"));}
//$secs = (((date("G")-5) * 3600) + (date("i") * 60) + date("s")) / 240;
$secs = ((($hr -5) * 3600) + (date("i") * 60) + date("s")) / 120;


//$startColor = "0a053a";
//$endColor 	= "fff600";
//$step = "43200";



$overlayImg = imagecreatefrompng($overFilename); 
$dest = imagecreatefrompng($underFilename); 
$clockImg = createClock();
$timeTextImg = createTimeTextImage();

imagecopymerge($overlayImg, $clockImg, 105,275, 0, 0, 250, 70, 100);
imagecopymerge($overlayImg, $timeTextImg, 125,210, 0, 0, 150, 50, 100);


$rotatedImage = rotateImage($overlayImg, $secs);

$black = imagecolorallocate($rotatedImage, 0, 0, 0);
//$grey = imagecolorallocate($dest, 192, 192, 192);


imagecolortransparent($rotatedImage, $black);
//imagecolortransparent($dest, $grey);

imagecopymerge($dest, $rotatedImage, 100, 107, 0, 0, 410, 410,100);
imagealphablending( $dest, false );
imagesavealpha( $dest, true );

header('Content-Type: image/png'); 
imagepng($dest ) ;


function createTimeTextImage(){
	
	// Create the image
	$image = imagecreatetruecolor(180, 100);

	// Create some colors
	$white = imagecolorallocate($image, 255, 255, 255);
	$black = imagecolorallocate($image, 0, 0, 0);
	$blue = imagecolorallocate($image, 39, 9, 225);
	$orange = imagecolorallocate($image, 225, 151, 9);
	$grey = imagecolorallocate($image, 192, 192, 192);

	imagefilledrectangle($image, 0, 0, 190, 100, $white);

	$curTime = "TIME";
	// Replace path by your own font path
	//$font = 'ALGER.TTF'; 
    $font = './ARLRDBD.TTF';
	imagecolortransparent($image, $white); //change white to grey
	// Add some shadow to the text
	
	// Add the text
	imagettftext($image, 25, 0, 30, 25, $orange,$font, $curTime);

	// Using imagepng() results in clearer text compared with imagejpeg()
	return $image;
}

function createClock(){
if (date("G") < 5)
{$hr = (date("G") + 24);}
else {$hr = (date("G"));}
	// Create the image
	$image = imagecreatetruecolor(350, 110);

	// Create some colors
	$white = imagecolorallocate($image, 255, 255, 255);
	$black = imagecolorallocate($image, 0, 0, 0);
	$blue = imagecolorallocate($image, 39, 9, 225);
	$orange = imagecolorallocate($image, 225, 151, 9);
	$grey = imagecolorallocate($image, 192, 192, 192);

	imagefilledrectangle($image, 0, 0, 499,210, $white);


	$hour = ($hr-5) ;
	$min = (date("i")) ;

	$curTime = $hour . ":" . $min;
	// Replace path by your own font path
	//$font = 'ALGER.TTF';
	$font = './ARLRDBD.TTF';
	imagecolortransparent($image, $white);
	// Add some shadow to the text
	// Add the text
	imagettftext($image, 40, 0, 20, 70, $orange, $font,  $curTime);

	// Using imagepng() results in clearer text compared with imagejpeg()
	return $image;
}

    function rotateImage ($image, $angle)
    {
		while ($angle > 360){
			$angle = $angle - 360;
		}
		
		while ($angle < 0 ){
			$angle = $angle + 360;
		}
        if ( ($angle < 0) || ($angle > 360) )
        {
            exit ("Error, angle passed out of range: [0,360]");
        }
        
        $width    = imagesx ($image);
        $height    = imagesy ($image);
        
        $dstImage = imagecreatetruecolor ($width, $height);
        
        if ( ($angle == 0) || ($angle == 360) )
        {
            // Just copy image to output:
            imagecopy ($dstImage, $image, 0, 0, 0, 0, $width, $height);
        }
        else
        {
            $centerX = floor ($width / 2);
            $centerY = floor ($height / 2);
            
            // Run on all pixels of the destination image and fill them:
            for ($dstImageX = 0; $dstImageX < $width; $dstImageX++)
            {
                for ($dstImageY = 0; $dstImageY < $height; $dstImageY++)
                {
                    // Calculate pixel coordinate in coordinate system centered at the image center:
                    $x = $dstImageX - $centerX;
                    $y = $centerY - $dstImageY;
                    
                    if ( ($x == 0) && ($y == 0) )
                    {
                        // We are in the image center, this pixel should be copied as is:
                        $srcImageX = $x;
                        $srcImageY = $y;
                    }
                    else
                    {
                        $r = sqrt ($x * $x + $y * $y); // radius - absolute distance of the current point from image center

                        $curAngle = asin ($y / $r); // angle of the current point [rad]
                        
                        if ($x < 0)
                        {
                            $curAngle = pi () - $curAngle;
                        }
                        
                        $newAngle = $curAngle + $angle * pi () / 180; // new angle [rad]

                        // Calculate new point coordinates (after rotation) in coordinate system at image center
                        $newXRel = floor ($r * cos ($newAngle));
                        $newYRel = floor ($r * sin ($newAngle));
                        
                        // Convert to image absolute coordinates
                        $srcImageX = $newXRel + $centerX;
                        $srcImageY = $centerY - $newYRel;
                    }

                    if ( ($srcImageX >= 0) && ($srcImageX < $width) && ($srcImageY >= 0) && ($srcImageY < $height) )
                    {
                        $pixelColor = imagecolorat($image, $srcImageX, $srcImageY); // get source pixel color
                        imagesetpixel($dstImage, $dstImageX, $dstImageY, $pixelColor); // write destination pixel
                    }
                }
            }
        }
        
        return $dstImage;
    }