World: r3wp

I'm not an expert on the port object, so I'm continuing to do research.

Hello, I encounter a problem with the draw dialect under linux (rebol/view 
2.7.8). I have tried the following code from the official documentation: 
view layout [
    box black 100x100 effect [
        draw [
            pen red
            line 30x30 50x20 70x70 40x50

            pen blue
            box 20x20 80x80

            fill-pen 0.100.0
            box 20x60 40x80

            pen white
            text 8x25 "Example"

            fill-pen gold
            flood 2x2
        ]
    ]
]

Under windows, the text appears properly; but under linux, nothing 
appears.

Actally, it seems that the interpretation of the draw dialect stops 
when encountering the 'text.

might be a font problem? Better wait for some real experts, though 
...

When you try this under linux
view layout [
    box snow 100x100 effect [
        draw [
            pen black
            text 10x10 "Red Box:"
            pen red
            fill-pen red
            box 10x30 80x50
        ]
    ]
]


Only the snow box appears! Nothing is drawn into it... and rebol 
does not launch an error.

THis confirms that the interpretation of the dialect is stopped when 
the 'text is reached.

Under windows, no problem!

Under linux you need to setup the font object to be able use text 
rendered by DRAW dialect. So something like this should work:

my-font: make face/font [

 name: "/usr/share/fonts/truetype/freefont/FreeSans.ttf"   ;replace 
 with your path to font you want to use
	size: 12
]

view layout [
    box snow 100x100 effect [
        draw [
	font my-font
            pen black
            text 10x10 "Red Box:"
            pen red
            fill-pen red
            box 10x30 80x50
        ]
    ]
]

Cyphre... THANKS SO MUCH!! It works...


But now, how I can make my script working on both linux and windows 
with the same fonts look and feel?

you can put the os specific setup into something like:

switch system/version/4 [
	4 [ ;Linux

	]
	3 [ ;Windows

	]
]

What is the default Font for Rebol? I could add this font package 
in Rebol linux installer.

Better to choose a font which works on Linux... last time I used 
Rebol/View on linux, the default font look was very bad.

yes, I'd suggest to choose some nice looking font(prefferably free 
one, but depends on you) on Linux and then use it with the app on 
all systems.

But newbies need a working rebol on Linux., then they will choose 
their font. So, what is the default font on Rebol?

On windows I think it's arial

You can check it on linux using:
? system/view/vid/vid-styles/text/font

MaxV: the problem on Linux is that there is no easy way how to get 
font path just by giving the font name + font type.( Windows does 
that automatically)

If you know how to do it in Linux so it works on all distributions 
that would be helpful.

(Maybe it would be enough to write some parser in rebol to get the 
font information from some place in the system, but I have no time 
to investigate this as I'm not using Linux for desktop stuff.)

? system/view/vid/vid-styles/text/font
helvetica
so, is it enogh  having helvetica font?
No, I made a link to FreeSans.ttf this way:
ln -s FreeSans.ttf helvetica.ttf
but it doesn't work.
I think that the path is wrong. The standard linux path  now is:
/usr/share/fonts/truetype/freefont/

so if Rebol path would be /usr/share/fonts/truetype/freefont/FreeSans.ttf 
, we have resolved all problems!

Is there a way to know Rebol font path?

rebol uses system fonts, so its the other way round, is there a way 
to know system font path.  on linux  no one has done any in-depth 
assessment if there is a single way to find out what are the installed 
fonts for *any* linux.

I tend to use thing like  
stderr: open/direct/binary %/dev/stderr
but am no longer petending to care about windows portability

My other question is: why Rebol find the fonts path for all dialects 
 except DRAW?

R2 uses different methods to do regular graphics and Draw. Draw is 
done only with AGG, the rest of View is not. The font code is different.

For R3, all graphics are done with AGG. Don't know yet about the 
font support on Linux.

May you explain me why this works under Linux and no font PATH is 
requested? 
REBOL [
	title: "SW-like scroller by Cyphre"
	author: [cyphre-:-seznam-:-cz]
]

scr-size: 640x220
scrl: scr-size * 0x1
c1: scrl
c2: as-pair scr-size/x / 2.5 scr-size/y / 5
c3: as-pair scr-size/x - (scr-size/x / 2.5) c2/y

view/new layout [
	origin 0

 bx: box scr-size effect [draw [] gradcol 0x-1 sky black] with [feel: 
 none]
]

while [not empty? system/view/screen-face/pane][
	scrl/2: scrl/2 - 1

 img: to-image t-face: make face [edge: none color: black size: scr-size 
 text: system/license font: make font [size: 20 style: 'bold color: 
 white] para: make para [scroll: scrl]]
	if scrl/y < - second size-text t-face [
		scrl/y: c1/y
	]
	bx/effect/draw: [
		pen black
		fill-pen black
		box 0x0 scr-size
		image img c2 c3 scr-size c1
	]
	show bx
	wait 0
]

???????

To clarify the 'font issue' a bit:

In REBOL2 there are two different 'font engines':
engine1:  is used when you set face/text field
engine2:  is used when you use face/effect: [draw [text "..."]]


On Windows both engines use the same OS functions for the font handling. 
Therefore no differencies are seen at the script level. 


On Linux the Engine1 us using some X-windows api and the Engine2 
is using FreeType2 library. 

The X-windows font api doesn't support antialiasing and the font 
output in general is not so nice (depending on the distro).

The FreeType2 lib has better font quality output and also supports 
antialiasing but you have to know the full-path to the font file.


Currently noone suggested any efficient method how to get the 'font 
path' in unified way (considering the 'mess' between different Linux 
distros). 

When I tried to investigate a bit someone pointed me to the FontConfig 
lib that should take care of this problem on Linux. But:

1. I don'r know if the fontconfig is really widely supported and 
what other 'framewrorks' are possible on the rest of distros that 
don't have fontconfig...

2. I don't know how easy/hard is to get the info from fontconfig, 
havent studied it

3. as I said I'm not using Linux for desktop stuff so it is nto my 
high-priority item.


Another solution is to intorduce something like global font-path 
in the Rebol system object which would be used for the font lookup. 
This variable could be set individually by user or author of the 
rebol program. We could also provide some font-name/type->font-file 
matching table but that would take some research as well and won't 
work for all setups. But at least something.


So If anyone here from the 'Linux power users' group knows a good 
solution or even propose a prototype of the solution I believe Carl 
will be glad for your help.

MaxV: regarding the example question above: the answer is easy: in 
this example the font is rendered using the 'Engine1' (see the msg 
above) then the output is cvonverted to bitmap(image) and the image 
is rendered as texture using perspective  transformation. So in the 
end the 'Engine2' is not used in the example in any way.

I noticed a difference between Linux and Windows:
Widndows: ?  system/view/vid/vid-styles/text/font    == "arial"

Linux: ?  system/view/vid/vid-styles/text/font    == "helvetica" 
 
Is it normal?

However Mandriva, Suse/Novell, Fedora/RedHat, Ubuntu use the followings:
/usr/X11R6/lib/X11/fonts/truetype/feefont
/usr/share/fonts/truetype/freefont
I think it could be fixed.

font differences: ofcourse Arial doesn't exist on Linux...unless 
you install MS fonts. See my note about  'matching table'...such 
stuff is definitely needed.

Or an alert message "/usr/share/fonts/... not found!"

Even helvetica doesn't exist!

Copyright Adobe 1994-1997

MaxV: It's all about writin a proposal 'how to solve the font issues 
on Linux' then it can be discussed in some more serious way and in 
the end it can be implemented in future releases of R2. So there 
is nothing that blocks you to do the research and propose a solution.

OK

But as I see from your wondering about different font names etc. 
I feel you are realizing this won't be an easy task ;) Anyway, if 
you want to be helpful, just go for it!

http://behdad.org/text/may provide some interesting background reading

i fear you'll be hard-pressed to come up with a very general solution

fontconfig is to the best of _my_ knowledge the most wide-spread 
thing you can use

(for discovering fonts, that is)

As I said I have neither time nor personal need to become 'linux 
font master' so in fact I'm not 'pressed' by anything ;) I'll left 
this part to others.

that was more directed towards massimiliano than towards you :)

ah...I owerlooked the name..you have almost identical 'nick color' 
! :)

so no I realized I'm talkind to you, Andreas :))

:)

I want to use PK authentification with SSH from my client account 
but be able to use two or more different logins. So, one PK for Username-A, 
one for Username-B etc.


How do I set this up? How do I have to name my local private keys 
in that SSH will find them? How and where to store the public keys 
on the server?

I don't think you should care about that, just use:
username-a: "my_string"
username-b: "my_other_string"
call (reform [ "ssh" username-a   mycommands etc] )

However ssh stores files in 
~/.ssh/authorized_keys

See http://support.suso.com/supki/SSH_Tutorial_for_Linux

The public keys are stored in $HOME/.ssh/authorized_keys for the 
respective users

Key-based SSH authentication is most convenient when used in combination 
with an "ssh agent" that holds the private keys and (temporarily) 
stores their passphrase

You can then just load multiple keys into your SSH agent, and all 
of them will be tried for authentication