One problem I am having is that the API I have to implement only
provides access to an Icon (javax.swing.Icon). That's just an
interface, so it is a pretty opaque object; all you can really do
is get the size of the Icon, and call paintIcon on it.
I'm not entirely sure I followed this so I might be off base. But
there is a trick to get an Image from an Icon that I think I
originally got from gl4java where you use a Graphics subclass.
Something like...
Code that wants to manipulate Icon as an image ( gui.FileSystemModel
from my application code - This to scale the icon as an image)
tmpIcon = (Icon)((CachedIcon)icons.get(extension)).getIcon
(); // = (Icon)new ImageIcon(f.getPath());
if (tmpIcon == null) throw new NullPointerException
("FilePreviewrer: icon is not cached");
IconGraphics icon2img = new IconGraphics(getGraphics());
tmpIcon.paintIcon(this,icon2img,0,0);
Image iconimg = icon2img.getImage();
int imageWidth = iconimg.getWidth(this);
int imageHeight = iconimg.getHeight(this);
buffimg = new BufferedImage
(imageWidth,imageHeight,BufferedImage.TYPE_INT_RGB);
Graphics icong = buffimg.createGraphics();
icong.drawImage(iconimg,0,0,this);
resicon = new ImageIcon(buffimg.getScaledInstance
(32,32,Image.SCALE_DEFAULT));
The pertinent parts of the IconGraphics Graphics subclass
public IconGraphics(Graphics g) {
this.g = g;
}
* Set the desired dimensions for the rendered Icon and then
* invoke paintIcon() passing it this as the graphics
* The icon's image will be saved when passed to the drawImage() method
* of this class. The JVM does the conversion to Image before invoking
this
* method. There is no other way I know of, pure java, to extract a
Image from a Icon
* so this kluge seems required.
* I got the idea from the GLGraphics class of GL4Java.
is the comments. Off-hand for this...
Image iconimg = icon2img.getImage();
I'm not sure what initialized the returned image from the graphics
subclass
public Image getImage() { return i; }
But anyhow, the scaling isn't perfect but it works.
IconGraphics is part of my utility package
utillib.widgets.IconGraphics, so apparently I thought this useful
enough that it would see some re-use.
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