World: r3wp

Thank you guys, I can never learn enough of Rebol.

>> a: "1.  "  ;here's  a space
== "1.  "   
>> layout [text a]
>> a 
== "1."

That looks more like a quirk of the function, than as something one 
should explain to the beginners.

The function looks like trying to be "cleverer" than the user.

I feel  that 'a should not be modified?

probe select system/view/vid/vid-styles 'text
...
if all [not flag-face? self as-is string? text] [trim/lines text]
...

Just don't know how one should set the flag as-is... I'm not using 
view many years

Googled....
>> a: "1. " layout [text as-is a] a
== "1. "

Ok

[trim/lines text]   or [trim/lines copy text]  ?

the latter one, if you don't want the original string modified.

0MQ binding.. that is awesome! Does/will this work for R2 also maybe? 
:)

ups .. wrong chanel

VID question (R2): Is it possible to get the cursor position in the 
scroll-line event? I wanted to use the scroll to zoom in (like in 
google maps), and to zoom in to the right area, I needed the cursor 
position. Thanks for the help.

You can get cursor position using CARET-TO-OFFSET

Unluckily the face I am using is a plain panel, so no text there. 
I just tried PRINT CARET-TO-OFFSET pnl-map "", and it returns none.

That's the mouse pointer, not the cursor (sorry, terminology isn't 
very portable to REBOL).

You probably need to remember the offset from the last 'move event, 
since the scroll-line uses the event offset parameter itself.

yes, you need to hack the event engine a little bit.   


As gregg says, you need to have a memory of the last move event to 
get its position  and store it (you can do this with an event-handler). 
 glayout and GLASS do this for handling scrollwheel events.


what I also do is find the top-level face which is under the mouse-cursor 
and fire off my own events from the scroll-wheel instead of relying 
on a text field.

again, you can trap the scroll-wheel events in the event handler.


if you want to have a ready-made solution, download glayout.r from 
rebol.org  and look at the hacked WAKE-EVENT function.


it already does all of this and wraps it up by adding new function 
you can add to your face/feel  object in order to handle scroll-wheels.

the wake-event function needs a few other functions which are all 
in the glayout module, but it should be easy to keep just what you 
need and run that before the rest of your script.

Thanks for the help, I am still digging around, will let you know 
the result. I will have to translate all that to RebGui though.

Is there a better way than this to convert a block to string, then 
back to block?
blk-to-send: reduce ['my-function 1 2 3]
str-zmq: mold blk-to-send
blk-received: first to-block str-zmq
Thanks for the help!

use LOAD instead of FIRST TO-BLOCK

Thanks Rebolek!

Is there a way to start the word browser directly without going thru 
the viewtop?

do http://www.rebol.com/view/tools/word-browser.r


You can <alt>-click (or right-click) icons in the viewtop to see, 
where the script come from.

Awesome

Is there a way to to get the time in a datetime value without using 
refinement?
>> d: now
>> d/time
== 12:09:58

Is there something like select d 'time OR pick d 'time ? Thanks.

>> fourth now

== 13:23:31

Works in both REBOL 2 and 3.

This works in R3:
   >> pick now 'date
    == 30-May-2011

This is cool! Thanks!

I encountered another problem:
>> 1.48297457491612E-2 + 0.985170254250839
== 1.0
>> arccosine/radians 1.48297457491612E-2 + 0.985170254250839
** Math Error: Math or number overflow

** Near: arccosine/radians 1.48297457491612E-2 + 0.985170254250839

>> arccosine/radians probe (1.48297457491612E-2 + 0.985170254250839)
1.0
** Math Error: Math or number overflow

** Near: arccosine/radians probe (1.48297457491612E-2 + 0.985170254250839)
>> arccosine/radians 1.0
== 0.0

That's a rounding problem. You can check such numbers in R3 by:

>> to binary! 1.48297457491612E-2 + 0.985170254250839
== #{3FF0000000000001}
>> to binary! 1.0                                     
== #{3FF0000000000000}

I don't understand it, from 'probe', it seems like it already returned 
1.0, why arcosine/radians still get > 1.0

>> system/options/decimal-digits: 17
>> to decimal! #{3FF0000000000001} 
== 1.0000000000000002

>> (1.48297457491612E-2 + 0.985170254250839) = 1.0
== true

decimal-digits tell, how many digits, you wanna see. But when you're 
out there at 15-17 digits, you can't count on the last one, so it's 
choosen to be not seen.

= (or equal?) is not exact. Use == (strict-equal?)

>> (1.48297457491612E-2 + 0.985170254250839) == 1.0
== false

Makes sense?

Ok, I got it now. Thanks Geomol!

welcome

Is there a best practice for such situation? Always rounding to 0.0000000000000001 
?

well, I just tried (R2):
>> (1.48297457491612E-2 + 0.985170254250839) == 1.0
== true

In R2, integers are 32 bit, in R3 64 bit.

sorry, 1 second :)

Hm, you may have a serious problem. Let me see...

:) REBOL2 can't do math. Thinking, if a struct! can help.

Hahaha :)

>> arccosine/radians probe round/to (1.48297457491612E-2 + 0.985170254250839) 
1E-15
1.0
** Math Error: Math or number overflow

** Near: arccosine/radians probe round/to (1.48297457491612E-2 + 
0.985170254250839) 1E-15

>> arccosine/radians probe round/to (1.48297457491612E-2 + 0.985170254250839) 
1E-14
1.0
== 0.0