Re: Zoom Patch

["Phillip Neiswanger" <sigsegv0 gmail com>]

On Sat, 30 Aug 2008 21:06:41 -0600, Sameer Sahasrabuddhe  
<sameerds gmail com> wrote:

> On 8/30/08, Phillip Neiswanger <sigsegv0 gmail com> wrote:
>
> > Pressing SHIFT + middle mouse button and moving the mouse up will zoom  
> > in
> > and pressing SHIFT + middle mouse button and moving the mouse down will
> > zoom out.
>
> Arrgh. I just tried this gesture ... my elbow thinks I should give my
> washing machine a break and consider scrubbing clothes to build up
> some muscle power first. ;) I don't know enough to comment on the
> changes about smooth zooming, but what is wrong with plain simple
> shift + wheel scrolling? Why move the whole mouse!

Simple.

1. This is the mouse I own.

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=230284952391

This is the only mouse I will ever own until I find another track ball  
mouse that's better. So far, nothing I've tried beats it. As you can see,  
I do not move a mouse, I roll a ball and it does not provide a  
scrollwheel. Thus, it did not even occur to me to tie zooming to a  
scrollwheel. What does it matter anyway? Why can't Dia support mice with  
and without scrollwheels? Shouldn't this be something I can configure?

2. The inspiration for this patch comes from this program:

www.rhino3d.com

I haven't tried the latest version of Rhino3d, but in the version I own it  
does the following. The left button is always select. You click on objects  
to select them or you select with a selection box. Pressing the control  
key while selecting allow you to select multiple objects one at a time.  
Very similar to Dia. The right button depends on the click. A quick press  
and release, when no objects are selected, repeats the last operation.  
When objects are selected, a press and release brings up the object  
properties dialog. A press and hold starts panning. A press and hold while  
pressing the control key starts zooming. Both panning and zooming respond  
to movements of the mouse. Zooming only responds to up/down movements. I'm  
sure the latest version provides functionality for the scrollwheel. I  
haven't tried it, so I don't know what it is.

Reguardless. The point of my patch was to give Dia a more interactive zoom  
than what is currently provided by Dia. In the end, I don't care what  
sequence of buttons I have to press or what kind of mouse movement is  
required. I just would like to see a more interactive zoom.

BTW, I've changed the constants used in ddisplay_zoom() from 1.1 and 0.9  
to 1.02 and 0.98. The zooming is a little smoother with the new constants.  
Also, I neglected to mention this, but this patch removes the zoom  
limiting code in ddisplay_zoom() and ddisplay_set_origo(). The code in  
these functions produced some wierd interactions when smooth zomming and  
in the end I couldn't really figure out why there should be limits anyway,  
so I removed it.
--
phil