javascript - Google Maps Marker — set background color

Question

I'm using a transparent PNG as my marker, and would like for the transparent area to be filled a certain color. I previously accomplished this using marker shadows, but those don't work with the visual refresh (i.e. v3.14).

Thanks!

Answer 1

A trick could be to manipulate the PNG image with PHP, if this is an option. The following script takes 4 parameters: the image source, the amount of red, green and blue.

image.php script:

$src = $_GET['src'];

$r = $_GET['r'];
$g = $_GET['g'];
$b = $_GET['b'];

$image = @imagecreatefrompng($src);

// Create a new true color image with the same size
$w = imagesx($image);
$h = imagesy($image);
$color = imagecreatetruecolor($w, $h);

// Fill the new image with desired color
$bg = imagecolorallocate($color, $r, $g, $b);
imagefill($color, 0, 0, $bg);

// Copy original transparent image onto the new image
imagecopy($color, $image, 0, 0, 0, 0, $w, $h);

// Serve the image
header("Content-type: image/png");
imagepng($color);
imagedestroy($color);

In javascript, call image.php with the desired parameters:

var marker = new google.maps.Marker({
    position: new google.maps.LatLng(0, 0),
    map: map,
    icon: 'path/to/image.php?src=http://maps.google.com/mapfiles/marker.png&r=100&g=125&b=255'
});

Original image:

Output image: