It
may not be exactly what you want, but I did a print preview panel where
I had to scale Printable pages down into a small window. In order to
get past the problem where moving the cursor over the window redrew
what was underneath the cursor at original scale, I ended up removing
the mouse listeners and key listeners. The panel was meant to be
read-only and uneditable, so this worked for me.
Steve Sinai
--- On Sun, 8/10/08, Dmitri Trembovetski <[EMAIL PROTECTED]> wrote:
From: Dmitri Trembovetski <[EMAIL PROTECTED]>
Subject: Re: [JAVA2D] Generic ZoomPanel?
To: [EMAIL PROTECTED]
Date: Sunday, August 10, 2008, 3:08 PM
In general transforming Swing components
is a little tricky.
Take a look at this helper class though:
http://weblogs.java.net/blog/alexfromsun/archive/2006/07/jxtransformer_t.html
I believe Alex updated it since.
Thanks,
Dmitri
[EMAIL PROTECTED] wrote:
> Hi all,
> a question re. the Java 2D API:
>
> I would like to create a generic ZoomPanel, i.e. a Panel that would allow
to display the objects contained in it using an adjustable zoom factor.
> Ideally this Panel would be used much like a JScrollPanel, i.e.:
>
> The JScrollPanel allows to wrap some content in a scrollable panel by just
using:
>
> 1) main.add(new JScrollPane(someContentPanel));
>
> Ideally I would like to apply the Zoompanel in the exact same way, i.e.:
>
> 2) main.add(new ZoomPanel(someContentPanel));
>
> This would even allow to combine the two, e.g.
like:
>
> 3) main.add(new JScrollPane(new ZoomPanel(someContentPanel)));
>
>
>
> Using Google and some API documentation I found misc. code snippets, which
I condensed into the following:
>
> class ZoomPanel extends JPanel
> {
> private double scalingFactor = 0.50;
>
> ZoomPanel(final JComponent comp) {
> setLayout(new BorderLayout());
> add(comp, BorderLayout.CENTER);
> }
> /**
> * @return the scalingFactor
> */
> double getScalingFactor() {
> return this.scalingFactor;
> }
> /**
> * @param scalingFactor the scalingFactor to set
> */
> void setScalingFactor(double scalingFactor) {
> this.scalingFactor = scalingFactor;
> }
> @Override
> public Dimension
getPreferredSize() {
> final Dimension size = getLayout().preferredLayoutSize(this);
> return new Dimension((int)(size.width * this.scalingFactor),
> (int)(size.height * this.scalingFactor));
> }
> @Override
> public boolean isOptimizedDrawingEnabled() {
> return false;
> }
> @Override
> public void paint(Graphics g) {
> Graphics2D g2 = (Graphics2D) g;
> java.awt.geom.AffineTransform backup = g2.getTransform();
> g2.scale(this.scalingFactor, this.scalingFactor);
> super.paint(g2);
> g2.setTransform(backup);
> }
> }
>
>
> If applied as shown under 3) the above ZoomPanel does indeed display a
zoomed copy of all children contained in "someContentPanel".
> So, at first
everything looks fine. However, if I move with the mouse over
that panel, then certain children appear (i.e. are repainted) in their original
size and location and obviously also the mouse positions are not properly
translated and all clicks etc. go to wrong positions. So obviously the above is
too simple (would have been too nice...) and does not cover every aspect that
has to be taken care of in such a zoom panel
>
> Has someone implemented something like this and could give me a list or at
least a rough sketch, what all is still missing to achieve a generic panel? What
needs to be overriden, added, replaced or whatever it takes to get this fully
operational and usable?
>
> Note: I do NOT know, what "someContentPanel" contains. As I
said: I am trying to create a [b]generic[/b] panel that allows for arbitrary
content.
>
> Michael
> [Message sent by forum member 'mmo18'
(mmo18)]
>
> http://forums.java.net/jive/thread.jspa?messageID=292502
>
>
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