Yes, opaque is set to false. That is what makes it transparent. That is why I can see the BufferedImage 'through' it.
Ted > -----Original Message----- > From: Dmitri Trembovetski [mailto:[EMAIL PROTECTED] > Sent: Monday, August 11, 2003 12:34 PM > To: Ted Hill > Cc: [EMAIL PROTECTED] > Subject: Re: [JAVA2D] Painting in Transparent Panel > > > Hello, > > make sure that your transparent panel has opaque property set to > false. > > For more info, check out this article: > http://java.sun.com/products/jfc/tsc/articles/swing2d/index.html > > Thank you, > Dmitri > > On Mon, Aug 11, 2003 at 09:59:39AM -0500, Ted Hill wrote: > > Hello, > > > > I am seeing some 'distortion' when painting in a transparent panel. > > > > What I have: > > ========= > > I have an opaque JPanel that displays a buffered image. The image can > be > > zoomed and panned using the AffineTransform. > > > > I have another transparent JPanel which is added to the parent JPanel > > mentioned above. It also overrides paintComponent(g) and draws some > > strings on top of the BufferedImage in the parent panel. Because the > > child panel is transparent, the parent's BufferedImage 'shows through' > > beneath the Strings. The transparent child covers about 20% of its > > parent and is positioned along the right hand border of the parent > > panel. > > > > The transparent panel is not always visible. When mousing into a > certain > > area of the parent panel, it is set visible and then it draws some info > > Strings on top of the parent. When mousing out of the 'trigger' area, > > setVisible(false) is called on the transparent child. > > > > What I see: > > I *occasionally* get a "lens" effect when "looking through the > > transparent child" at the BufferedImage below. That is, depending on > the > > scale and translation values of the parent, there appears to be a tiny > > shift in the image of perhaps one-pixel. > > > > For example, if I mouse in and out of the area that activates the > > transparent child, the underlying image is sometimes seen directly on > > the parent panel and sometimes viewed through the transparent child. As > > the state changes, I see the shift mentioned above. > > > > Changing the zoom and pan by only a small amount will often cause this > > "lens" effect to disappear. Then changing them again by a small amount > > will cause the effect to reappear. > > > > That is, at certain scale and translation values, I never see the lens > > effect, at others I do. > > > > What I'm wondering: > > Could this be caused by some kind of pixel round-off calculation in the > > child? (Perhaps my child panel is not aligned with its parent on a > > pixel boundary?) If so, is there some way to prevent this? > > > > My code base is very large, so unfortunately I can't post a working > > example of this. > > > > Thank you for your help, > > > > Ted Hill > > > > > > > > > > > ======================================================================== == > = > > To unsubscribe, send email to [EMAIL PROTECTED] and include in the > body > > of the message "signoff JAVA2D-INTEREST". For general help, send email > to > > [EMAIL PROTECTED] and include in the body of the message "help". =========================================================================== To unsubscribe, send email to [EMAIL PROTECTED] and include in the body of the message "signoff JAVA2D-INTEREST". For general help, send email to [EMAIL PROTECTED] and include in the body of the message "help".
