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Di Pascale
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 Posted: Mon Jan 24, 2005 1:00 pm Post subject: newbie question about image loading |
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I need to display only a particular portion of a big gif image in a
fixed-size square component; the coordinates of the visible square to
display are to be determined at runtime. What image component should I
use? I am only familair with the Swing label's setIcon() method, but it
doesn't let me choose what part of the image I want to display.
Any help would be greatly appreciated. Thanks in advance.
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Thomas Weidenfeller
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| Posted: Mon Jan 24, 2005 1:42 pm Post subject: Re: newbie question about image loading |
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Di Pascale wrote:
| Quote: | I need to display only a particular portion of a big gif image in a
fixed-size square component; the coordinates of the visible square to
display are to be determined at runtime. What image component should I
use? I am only familair with the Swing label's setIcon() method, but it
doesn't let me choose what part of the image I want to display.
|
a) Use e.g. any subclass of Image, e.g. BufferedImage, to hold the
image, and a JPanel to display it. Use e.g.
[url]http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Graphics.html#drawImage(java.awt.Image,%20int,%20int,%20int,%20int,%20int,%20int,%20int,%20int,%20java.awt.image.ImageObserver[/url])
to draw the image.
In order to pull this successful off, you need to familiarize yourself
with the general way drawing/painting in Swing happens.
b) Load the Image into a BufferedImage. Then use
[url]http://java.sun.com/j2se/1.5.0/docs/api/java/awt/image/BufferedImage.html#getSubimage(int,%20int,%20int,%20int[/url])
to create a sub-image. Create an ImageIcon from the BufferedImage and
display that ImageIcon in a JLabel.
c) Use a scrollpane, turn the scrollbars of, and set the viewport to the
parts of the image you want to display.
/Thomas
--
The comp.lang.java.gui FAQ:
ftp://ftp.cs.uu.nl/pub/NEWS.ANSWERS/computer-lang/java/gui/faq
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Di Pascale
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| Posted: Mon Jan 24, 2005 5:54 pm Post subject: Re: newbie question about image loading |
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You've been of great help... thanks a lot!!! I'll try to get the hang of
all the possibilities you've illustrated.
Thomas Weidenfeller wrote:
| Quote: | Di Pascale wrote:
I need to display only a particular portion of a big gif image in a
fixed-size square component; the coordinates of the visible square to
display are to be determined at runtime. What image component should I
use? I am only familair with the Swing label's setIcon() method, but
it doesn't let me choose what part of the image I want to display.
a) Use e.g. any subclass of Image, e.g. BufferedImage, to hold the
image, and a JPanel to display it. Use e.g.
[url]http://java.sun.com/j2se/1.5.0/docs/api/java/awt/Graphics.html#drawImage(java.awt.Image,%20int,%20int,%20int,%20int,%20int,%20int,%20int,%20int,%20java.awt.image.ImageObserver[/url])
to draw the image.
In order to pull this successful off, you need to familiarize yourself
with the general way drawing/painting in Swing happens.
b) Load the Image into a BufferedImage. Then use
[url]http://java.sun.com/j2se/1.5.0/docs/api/java/awt/image/BufferedImage.html#getSubimage(int,%20int,%20int,%20int[/url])
to create a sub-image. Create an ImageIcon from the BufferedImage and
display that ImageIcon in a JLabel.
c) Use a scrollpane, turn the scrollbars of, and set the viewport to the
parts of the image you want to display.
/Thomas
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