Thanks for posting that Kesuke! It would be great to get this working.
Those 404s have been a headache for quite a while.
I've implemented your example on a small test page and I'm not seeing
any tiles. I'm not too familiar with PHP but I did check that safe
mode is "off" with phpinfo.
My php looks like this:
<?php
$filename = "/var/www/merge/tiles/" . intval($_GET['z']) .
"_" .intval($_GET['x']) . "_" . intval($_GET['y']) . ".png";
header("Content-Type: image/png");
header("Cache-Control: max-age=84600");
if (file_exists($filename)) {
header("Content-Length: " . filesize($filename));
readfile($filename);
} else {
readfile("/var/www/merge/tiles/clear.png");
}
?>
the tiles are at:
http://69.164.209.124/merge/tiles/
and the page is here:
http://69.164.209.124/merge/mimagery.html
Any idea what I'm missing here?
Thanks in advance for a steer in the right direction.
On Jul 30, 10:19 am, Kesuke <nick_dai...@hotmail.com> wrote:
> Okay, thanks everyone – the PHP solution works great!
> So here is a guide for Jason or anyone else who stumbles across this;
>
> 1.) Make a new PHP file with the following code:
>
> <?php
>
> $filename = "/usr/www/httpdocs/tiles/" . intval($_GET['z']) . "_" .
> intval($_GET['x']) . "_" . intval($_GET['y']) . ".png";
>
> header("Content-Type: image/png");
> header("Cache-Control: max-age=84600");
>
> if (file_exists($filename)) {
> header("Content-Length: " . filesize($filename));
> readfile($filename);
> } else {
> readfile("/usr/www/httpdocs/clear.png");
> }
>
> ?>
>
> Basically this PHP script will check to see if the file exists. If it
> does it will return the file. If it doesn't, it will return a 1px
> empty image, in this case called 'clear.png'. The only stuff you
> should need to change are the paths to clear.png and $filename. Be
> aware that PHP safe mode can probably screw this up.
>
> NOTE: counter-intuitively, PHP looks for the true file destination NOT
> the URL. So you need to know your servers C:// style path to the file.
> There are ways around it using fopen() but you would need to look
> those up - not realising this gave me headaches.
>
> 2.) Now, go into your map javascript and point to the PHP file instead
> of the image URL. Specify the zoom/x/y co-ords which we will detect
> using $_GET in our PHP script. If you don’t know what $_GET is have a
> look on google as its quite fundamental – but in basic terms you send
> variables and their values to a PHP document by appending the URL with
> the format “map.html/?var=value&othervar=value”. PHP then plucks those
> values and variables out for you to use.
>
> So, using the above example:
>
> function createImageMapType(id) {
> return new google.maps.ImageMapType({
> getTileUrl: function(coord, zoom) {
> return "/tilefinder.php?z=" + zoom + "&x=" + coord.x + "&y=" +
> coord.y;
> },
> tileSize: new google.maps.Size(256, 256),
> isPng: true,
> opacity: true
> });
> }
>
> I hope this helps. So far it seems to be working well on my site,
> there is a noticable improvement in load times and my Google PageSpeed
> score got pushed up by about 20-30 points. If you want to improve
> things further, I suggest setting a higher max-age (probably of 28
> days/2419200) and also adding a last modified content-type header.
>
> On Jul 30, 12:52 am, John Coryat <cor...@gmail.com> wrote:
>
> > On Friday, July 29, 2011 6:20:03 PM UTC-5, Jason wrote:
>
> > > Sorry for the noob question but does this require any other
> > > configuration changes (ie. htaccess)? I've included this in my
> > > index.html and it is still showing 404 errors in Chrome.
>
> > > Thanks
>
> > You'll have to be more specific. What did you try? What's the URL of your
> > map?
>
> > -John Coryat
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