zoom a picture

[Jim77215]

I'd like to be able to allow a user to zoom in and out of a picture displayed on a labview front panel. Is this sort of thing only possible with IMAQ? Is there a relatively simple example available that demonstrates how to do this?

[alipio]

Hello
It is nor clear what type of picture are you talking about.

Perhaps you should look at ../examples/picture/demos.llb and pictctl.llb. There are a couple examples about zooming.

Hope it helps
Alipio

[zou]

Image toolbox provide high quality image resize for Picture control.

http://www.geocities.com/gzou999/imgtool.htm


George Zou

[Jim77215]

George,

I did download image toolbox and I do like it. Couple of questions:

1. What are licensing requirements for distributing vi's using the toolbox
2. I notice that the zooming always occurs with respect to the upper left corner of the picture. Is there anyway to make it zoom about a particular point in the picture. For example the user may want to zoom such that everything expands about the center of the picture

Thanks,
Jim

[zou]

No license required for your client.

You may distribute your applications (exe, dll or VI/llb) with my VIs upto 1000 copies (each application).

If you want to distribute your application in VIs/llb with my VIs, you have to make your client aware that if they use my VIs in the project other than yours, there is a copyright issue.

Zooming point is just a redraw issue. For example, if you want zoom about the cursor point,
and the cursor is at (10, 10), assume the top-left corner is (0, 0), and your picture size
is 20x20, after zooming, you want to draw your picture starting at (-10,-10).

George Zou
http://gtoolbox.yeah.net

[Mentos]

Hi George,

I saw this old issue on the forum and it looks like your Image toolbox is exactly what I need.

It's been a long time. Can I still download this toolbox ? (where ?)

Thanks in advance. 

[zou]

The new address is:

http://webspace.webring.com/people/og/gtoolbox

By the way, this is a very old thread.  Latest LabVIEW already has a zoom function build-in for Picture control.

Depend on what version you're using, some version doesn't work well when shrink.  And not friendly with 32 bit image.

George Zou

[Mentos]

OK,

Thank you for that.

BR,

Mentos

[Mentos]

Hi George,

I need to scale a jpg picture like the one attached to about 10 percent of its original size.

Before I purchase the Image toolbox (in order to use only the resize vi) I have to be sure the resulting picture is sharp enough to print (on a lable) and I don't get pictures like the "bad one" attached.

Is there anyway to garentee this ? can you send me some kind of demo etc. ?...

[zou]

It would be looks like the one on the right.

George Zou

http://webspace.webring.com/people/og/gtoolbox/