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Using GD resize() on Image objects in a page controller
18 March 2009 at 6:33pm
I'm writing a function that selects an image at random and returns an image tag. I'd like to scale that image, but I can't work out how.
class HomePage_Controller extends Page_Controller {
...function RandomImage() {
$galleryItem = DataObject::get_one('GalleryItem', 'MyHomePageID != 0', false, 'RAND()');
$g = DataObject::get_by_id("GalleryItem_ProductImage", $galleryItem->GalleryItemImageID);//somehow scale $g here
return "<img src=\"$g->Filename\" alt=\"$galleryItem->GalleryItemTitle\" />";
}...
}As I understand it, my get_by_id() call should be returning an Image (GalleryItem_ProductImage extends Image) which means that I should be able to use GD functions on it.
But if I create a new GD object and use resize() it, how do I then get the filename for the src attribute?
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Re: Using GD resize() on Image objects in a page controller
19 March 2009 at 1:28pm Last edited: 19 March 2009 1:30pm
Here's the workaround that I used. In mysite/code/HomePage.php.
I now have:
function RandomImage() {
return DataObject::get_one('GalleryItem', 'MyHomePageID != 0', false, 'RAND()');
}In my template I just wanted to have $RandomImage, which would output an <img scr="blah.jpg" alt="blah"> tag.
Instead I do this in the template:
<% if ClassName = HomePage %>
<% control RandomImage %>
<img src="$GalleryItemImage.Scaled.URL" alt="$GalleryItemTitle" class="Logo{$LightLogo}" >
<% end_control %>
<% end_if %>RandomImage() returns at GalleryItem, and I used RandomImage to "iterate" through the set of one GalleryItem.
In mysite/code/GalleryItem.php, after the GalleryItem model class I have:
class GalleryItem_ProductImage extends Image {
function generateScaled($gd) {
return $gd->resize(552, 561);
}} //end class
I'm not really sure why but this allows me to use "$GalleryItemImage.Scaled" in the template. SS chops off the 'generate' part of 'generateScaled' and 'Scaled' returns a GD object, which for some reason I don't understand I can then access its URL property.
I hope this helps someone, and I hope someone else can explain to me the things I don't understand
(ps wow, tabs work in "code" blocks!)
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