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SilverStripe Forums » General Questions » How can I use GD Functions? (not on the fly)
General questions about getting started with SilverStripe that don't fit in any of the categories above.
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How can I use GD Functions? (not on the fly)
8 October 2011 at 12:45pm
I've been using on the fly GD Functions in my templates and that's great!
But now i need to use it inside my backend personal function and i don't know how to call it.
-------------------------
class Example extends ImageGalleryPage {static $has_one = array(
'Picture' => 'ExampleThumb'
);public function MyFunction() {
$query = DataObject::get("Example");
foreach($query as $object)
{
if ($object->PictureID)
{
$image = DataObject::get_by_id("File", $object->PictureID);
$display_url = $image->URL;************************************************************
*** OK! How should i use GD Functions to change my image right now? ***
************************************************************
}
}
}}
class ExampleThumb extends Image {
function generateGoodOne($gd) {
$gd->setQuality(100);
return $gd->resizeByWidth(150);
}}
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Re: How can I use GD Functions? (not on the fly)
9 October 2011 at 1:26am
You need to create a class:
class SpecialDataPage_BannerImage extends Image {
function generatePageBanner($gd) {
$gd->setQuality(90);
//return $gd->paddedResize(678,300); original
return $gd->paddedResize(970,300);
}}
So in other class:
class SpecialDataPage extends Page {
static $has_one = array(
'Banner1' => 'SpecialDataPage_BannerImage',
'Banner2' => 'SpecialDataPage_BannerImage',
'Banner3' => 'SpecialDataPage_BannerImage',
'Banner4' => 'SpecialDataPage_BannerImage',
);....
$fields->addFieldToTab("Root.Content.Banners", new ImageField("Banner1", "Immagine Banner 1"));
}
and in template:
<% control Page(SpecialDataPage) %>
<!-- first slide -->
<% if Banner1 %>
<div>
<img src="$Banner1.URL" width="980" alt="Header Image" /></div>
<% end_if %>
<% end_control %> -
Re: How can I use GD Functions? (not on the fly)
9 October 2011 at 2:51pm
That's exactly what I don't want =/
This is an "on the fly" example of GD Function working in template.
I need to use it directly on the backend!
Sure I could write classic PHP code to do the work but...
How can I use "setQuality" and "resizeByWidth" inside my DataObject loop?
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Re: How can I use GD Functions? (not on the fly)
10 October 2011 at 9:11am
Well first you need to get the Image object and not the file as Images can be resized, files cannot.
$image = DataObject::get_by_id("Image", $object->PictureID);
Then once you have the image object you can call any of the methods you wish (http://api.silverstripe.org/2.4/sapphire/filesystem/Image.html).
$example = $image->generateFormattedImage('ResizedImage', 100, 40);
If you want the GD methods directly you can create a new GD object with the filename of the image
$gd = new GD(Director::baseFolder()."/" . $this->Filename);
$gd->rotatePixelByPixel(90);
...Consult the API documentation for more information.
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Re: How can I use GD Functions? (not on the fly)
11 October 2011 at 6:39am
Working like a charm !!!
$query = DataObject::get("Example");
foreach($query as $object)
{
if ($object->FotoID)
{
$image = DataObject::get_by_id("Image", $object->FotoID);
$image_url = $image->URL;
$image->generateFormattedImage('ResizedImage', 150, 89);
$thumb_url = $image->cacheFilename('ResizedImage', 150, 89);
}
}Thanks biapar and especially Willr ;)
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Re: How can I use GD Functions? (not on the fly)
11 October 2011 at 10:19am
There is also a Tutorial on this on SSBits: http://www.ssbits.com/tutorials/2010/rotating-and-greyscaling-images-using-gd-and-decorators/
Aram
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Re: How can I use GD Functions? (not on the fly)
11 October 2011 at 3:59pm
Aram, I'm a very old fan from SSbits Blog and certainly this post like so many others helped me a lot to enhance my SilverStripe limits ;)
When I finaly finish my project, I'll be the next site of the month >.<
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Re: How can I use GD Functions? (not on the fly)
12 October 2011 at 12:56am
Sweet, I look forward to it
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