Extends your SilverStripe 3 site to add watermarks to your images.
Extend your image class from the "WatermarkImage" class and implement the methods getWatermark, getWatermarkPosition and getWatermarkTransparency.
<?php
class MyImage extends WatermarkImage {
// by overriding this, you can define whether to automatically add the watermark or not
// (this can also be controlled in templates for every single image)
protected $addWatermark = true;
/**
* @return Image
*/
public function getWatermark() {
// in this example we assume has an image named "Watermark"
$siteConfig = SiteConfig::current_site_config();
if ($siteConfig->Watermark()) {
return $siteConfig->Watermark();
}
return null;
}
/**
* @return int
*/
public function getWatermarkPosition() {
// return the position at which the watermark should appear on the image
// can be 1 to 9 (representing the positions on your number pad)
return 3; // bottom right
}
/**
* @return int
*/
public function getWatermarkTransparency() {
// return the transparency of the watermark
// can be 0 to 100 (0 = fully transparent, 100 = no transparency)
return 90;
}
}In your DataObject, use class MyImage instead of Image for your images.
<?php
class MyDataObject extends DataObject {
public static $has_one = array(
'CoverImage' => 'MyImage'
);
public static $has_many = array(
'Images' => 'MyImage'
);
}In your templates, you can switch on and off the watermark:
<% with $CoverImage %>
<!-- this image will have a watermark, if $addWatermark (from the first example) is set to true,
otherwise the watermark is omitted -->
<img src="$SetRatioSize(400, 300).URL" />
<% end_with %>
<% loop Images %>
<!-- example: we do not want the watermark to appear on thumbnails, but we want it on our big images -->
<a href="$WithWatermark.SetRatioSize(800, 800).URL">
<img src="$WithoutWatermark.CroppedImage(100, 100).URL" />
</a>
<% end_loop %>You can also add a watermark to an image explicitly in PHP:
// assuming we have a $has_one = array('Image' => 'Image')
$this->Image()->addWatermark($watermarkImageObject, $watermarkPosition, $watermarkTransparency);You are welcome to improve this module and send me your Pull Requests.