[Caml-list] Ugly fonts in ocamlbrowser/editor

[Caml-list] Ugly fonts in ocamlbrowser/editor

[Wai-Sun Chia]

Hello lists,
Newbie here, just successfully installed ocaml-3.06 on my Redhat box. 
Was testing out labltk and ocamlbrowser and found that both the browser 
and editor uses the ugliest monospace font ever..

Any clues to how to change the default font for all labltk's 
applications? Or perhaps this is a tk issue?

-- 
Wai-Sun "Squidster" Chia
Techinical Consultant
Consulting & Integration

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[Caml-list] Problem with classes or i need help

[inv2002]

I don't know correct solution of my problem.

Here my example:
---begin 1.ml---
#!/usr/bin/env ocamltop

class virtual figure () =
  object
    method virtual to_string: string
  end

class triangle () =
  object
    inherit figure ()
    method private to_string = "Triangle"
    method m1 = Random.float 5.0
  end

class circle () =
  object
    inherit figure ()
    method private to_string = "Circle"
    method m2 = Random.int 6
  end

class screen () =
  object
    val mutable figures = []
    method add_figure f =
      figures <- (f#to_string ) :: figures
  end

let main () =
  let s1 = new screen () in 
  s1#add_figure (new circle ());
  s1#add_figure (new triangle ())

let () = main ()

--end---
[inv@localhost ~]$ ./1.ml
File "./1.ml", line 22, characters 5-121:
Some type variables are unbound in this type:
  class screen :
    unit ->
    object
      val mutable figures : 'a list
      method add_figure : < to_string : 'a; .. > -> unit
    end
The method add_figure has type < to_string : 'a; .. > -> unit where ..
is unbound

I understand the problem, but i don't know solution, help, please.
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Re: [Caml-list] Problem with classes or i need help

[Jacques Garrigue]

> class virtual figure () =
>   object
>     method virtual to_string: string
>   end
[...]
> class screen () =
>   object
>     val mutable figures = []
>     method add_figure f =
>       figures <- (f#to_string ) :: figures
>   end
[...]
> The method add_figure has type < to_string : 'a; .. > -> unit where ..
> is unbound
> 
> I understand the problem, but i don't know solution, help, please.

Are you sure you understood ?-)
There's nothing in your program to tell the compiler that the argument
to add_figure is supposed to be a figure.

    method add_figure (f : figure) =
      figures <- f#to_string :: figures

Or, if you want to avoid coercions when calling #add_figure,

    method add_figure : 'a. (#figure as 'a) -> unit = fun f ->
      figures <- f#to_string :: figures

Jacques Garrigue
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Re: [Caml-list] Ugly fonts in ocamlbrowser/editor

[Jacques Garrigue]

> Newbie here, just successfully installed ocaml-3.06 on my Redhat box. 
> Was testing out labltk and ocamlbrowser and found that both the browser 
> and editor uses the ugliest monospace font ever..
> 
> Any clues to how to change the default font for all labltk's 
> applications? Or perhaps this is a tk issue?

You can change fonts in camltk and labltk applications by writing tcl
commands in $HOME/.camltkrc.

For instance, here are my fonts:
option add *Font -*-helvetica-medium-r-normal--14-*-iso8859-1
option add *Text.Font -*-clean-medium-r-normal--14-*
option add *Listbox.Font -*-clean-medium-r-normal--14-*

For other possibilities of configuration, you can read the Tcl/Tk man
pages.

Jacques Garrigue
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Re: [Caml-list] Ugly fonts in ocamlbrowser/editor

[Wai-Sun Chia]

Thank you very much! ;-)
Just the info I was looking for..


Jacques Garrigue wrote:
<snip>
> 
> You can change fonts in camltk and labltk applications by writing tcl
> commands in $HOME/.camltkrc.
> 
> For instance, here are my fonts:
> option add *Font -*-helvetica-medium-r-normal--14-*-iso8859-1
> option add *Text.Font -*-clean-medium-r-normal--14-*
> option add *Listbox.Font -*-clean-medium-r-normal--14-*
> 
> For other possibilities of configuration, you can read the Tcl/Tk man
> pages.
> 
> Jacques Garrigue
> 

-- 
Wai-Sun "Squidster" Chia
Techinical Consultant
Consulting & Integration

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Re: [Caml-list] Problem with classes or i need help

[inv2002]

>> class virtual figure () =
>>   object
>>     method virtual to_string: string
>>   end
>[...]
>> class screen () =
>>   object
>>     val mutable figures = []
>>     method add_figure f =
>>       figures <- (f#to_string ) :: figures
>>   end
>[...]
>> The method add_figure has type < to_string : 'a; .. > -> unit where ..
>> is unbound
>> 
>> I understand the problem, but i don't know solution, help, please.
>
>Are you sure you understood ?-)
>There's nothing in your program to tell the compiler that the argument

>    method add_figure : 'a. (#figure as 'a) -> unit = fun f ->
>      figures <- f#to_string :: figures
>
>Jacques Garrigue
thanks, i'd try (f:figure) but a need inherit.

and now is a second problem:

    method add_figure : 'a. (#figure as 'a) -> string -> unit = fun f k ->
      Hashtbl.add figures k f#to_string

work correctly, but

    method add_figure : string -> 'a. (#figure as 'a) -> unit = fun k f ->
      Hashtbl.add figures k f#to_string

return syntax error,
can i define method
add key figure = ... 
???

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Re: [Caml-list] Problem with classes or i need help

[Jacques Garrigue]

From: "inv2002" <inv2002@yandex.ru>

> and now is a second problem:
> 
>     method add_figure : 'a. (#figure as 'a) -> string -> unit = fun f k ->
>       Hashtbl.add figures k f#to_string
> 
> work correctly, but
> 
>     method add_figure : string -> 'a. (#figure as 'a) -> unit = fun k f ->
>       Hashtbl.add figures k f#to_string
> 
> return syntax error,

Only prefix quantification is allowed.

     method add_figure : 'a. string -> (#figure as 'a) -> unit = ...

Jacques Garrigue
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