Question

Zoom In / Out JPanel

Asked by: rakesh786

Hello freinds,

I want to know how to zoom in/out jpanel and all of its components without disturbing the events assosciated with all of the components inside jpanel.

Thanx in advance.

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Asked On
2009-10-24 at 02:01:45ID24840132
Tags

Java Swing

,

AWT

Topics

Java AWT & Swing

,

Java Standard Edition

Participating Experts
3
Points
125
Comments
7

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Answers

 

by: rakesh786Posted on 2009-10-24 at 04:18:51ID: 25651650

Urgent!!!!!!!!!!!!!!!!!!!!!!!!!!!!


 

by: rpnmanPosted on 2009-10-25 at 05:55:52ID: 25656486

Do you mean the application of an affine transform to the image in a panel? (Designate a center point and scale up or down the image around it?)


 

by: sharath_kulalPosted on 2009-10-28 at 12:37:42ID: 25687337

by zoom in/ out you mean change the sizes of all the components in the panel? if that is what you want then  you need to write a listener to JPanel (like mouse scroll wheel) and increase/ decrease the size of all the components in the JPanel and repaint.

 

by: rpnmanPosted on 2009-10-28 at 17:46:40ID: 25689685

Gee I guess "urgent!!!!!!!!!!!!!!!!!!!!!!!!" means different things to different people :-)

 

by: rpnmanPosted on 2009-10-30 at 19:22:18ID: 25708084

Simple resizing of a panel and its layout is a given in Swing. Depending on the layout manager, the effect can work quite well. If something more is wanted here, we can only guess. The questioner has not come forward with any more details.  

I will add that in the past, I have solved the problem of maintaining performance while zooming a proportionally drawn panel by capturing (caching) a image of the panel and zooming that instead of actually re-rendering all the components while the zooming is going on, then re-drawing the panel components in their entirety at the newly zoomed state. It depends on the performance characteristics of the environment and the frequency of the zoom if it is worth all the trouble to implement that optimization.

If you are going to try to render panels proportionally to their size you have a lot of difficult considerations to bear in mind. You had better use images for buttons, for instance, or the wrap characteristics and font sizing can really throw you a curve.

 

by: dilandesilvaPosted on 2009-12-29 at 20:55:40ID: 26143295

Just override the paint method of the Jpanel and transform graphics and zoom by the ratio u want.
i.e.
public void paint(Graphics g)
{
    super.paintComponent(g);
    Graphics2D g2D = (Graphics2D) g;
    AffineTransform affT = g2D.getTransform();
    g2D.scale(zoom, zoom);
    super.paint(g);
    g2D.setTransform(affT);
}

20120131-EE-VQP-002

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