Re: problems zooming into plot region

[Petr M. <mi...@ph...>]

>> This does neither work by design:
>>         gnuplot> plot [1:10] sin(x)/x
>>         gnuplot> set xrange [5:8]; replot
>>
>> So why do you use   plot [x1:x2]  instead of  set xrange [x1:x2]?
>
> I find plot [x1:] more intuitive, shorter, one command less to write
> and faster to change from one command to the other.

I see, my findings are exactly opposite :-)

>>> Also, the mouse movement (moving wheel to left & right) which usually
>>> moves the graph to left & right is now zooming in & out instead of
>>> moving the graph.
>>
>> Wheel left and right? Do you have a trackball? I thought it works just as
>> mouse upside-down.
>
> I have a trackpad (http://www.apple.com/magictrackpad/).
>
>> The zooming in-out by +/- hotkeys and mouse wheel up/down implements my
>> patch
>>   [ gnuplot-Patches-3537423 ] zoom by mouse wheel and hotkeys
>> but it's not yet in sources so you have probably applied it yourself.
>
> No, I didn't apply any patch (even though I still want to test your
> patch more extensively) - I was using 4.6 stable branch. In X11 the
> usual mouse wheel is sending out buttons 4 and 5 for scrolling up and
> down, while 6 and 7 are for scrolling left and right. In wxt the
> following code moves left & right for example:
>
> 	mouse_button = (event.GetWheelRotation() > 0 ? 4 : 5);
> #if wxCHECK_VERSION(2, 9, 0)
> 	/* GetWheelAxis: 0 is the Y axis, 1 is the X axis. */
> 	if (event.GetWheelAxis() > 0)
> 	    mouse_button += 2;
> #endif
> 	wxt_exec_event(GE_buttonpress, x, y, mouse_button, 0, this->GetId());
>
>
>> The patch needs some testing ... because people using mouse with wheel like
>> zoom-in/out but people using touchpad expect scrolling instead
>
> Yes, exactly. I can use another "mouse gesture" to zoom in and out.
>
>> (even though it is rather useless for 2d graphs).
>
> Scrolling left and right is not useless for 2d graphs (maybe scrolling
> up and down is way less usable, but left and right is handy).

I meant the vertical scrolling in 2d graphs - zoom (around mouse cursor) is 
more useful.


> Slightly off-topic: what is the magic key combination (or another
> trick) to restore the original x and y range (the one set before
> moving & zooming the graph with the mouse)? I'm now using "p" key, but
> that takes forever to get back to the initial range.

That's the 'u' hotkey:
u = unzoom
a = autoscale
p = previous
n = next

---
Petr