"

 COPYRIGHT (c) 1994 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

Object subclass:#FontDescription

	poolDictionaries:''

	category:'Graphics-Support'

!

!FontDescription  class methodsFor:'documentation'!

copyright

"

 COPYRIGHT (c) 1994 by Claus Gittinger

	      All Rights Reserved

 This software is furnished under a license and may be used

 only in accordance with the terms of that license and with the

 inclusion of the above copyright notice.   This software may not

 be provided or otherwise made available to, or used by, any

 other person.  No title to or ownership of the software is

 hereby transferred.

"

!

documentation

"

    FontDescription is just a place-holder for scanned font names.

    [Instance variables:]

        family          <String>        the fonts family ('courier', 'helvetica' etc)

        face            <String>        the fonts face ('bold', 'medium' etc)

        style           <String>        the fonts style ('roman', 'italic', 'oblique')

        size            <String>        the fonts size (not in pixels) 

        encoding        <Symbol>        the fonts encoding (usually #iso8859)

    [author:]

        Claus Gittinger

    [see also:]

        Font

        FontPanel

        GraphicsContext

        ( introduction to view programming :html: programming/viewintro.html#FONTS )

"

! !

!FontDescription  class methodsFor:'instance creation'!

family:familyString

    "returns a font for given family and default (12pt) size 

     with unspecified encoding.

     The new fonts face defaults `medium', its style to `roman'.

     The returned font is not associated to a specific device"

    ^ self family:familyString

           face:'medium' 

           style:'roman' 

           size:12 

           encoding:nil

    "

     Font family:'helvetica'

     Font family:'courier'

    "

    "Modified: 30.4.1996 / 17:20:44 / cg"

!

family:familyString face:faceString size:sizeNum

    "returns a font for given family and size with unspecified encoding.

     The new fonts style defaults to `roman'.

     The returned font is not associated to a specific device"

    ^ self family:familyString

           face:faceString 

           style:'roman' 

           size:sizeNum

           encoding:nil

    "

     Font family:'helvetica' face:'medium' size:10

     Font family:'helvetica' face:'bold' size:10

     Font family:'courier'   face:'bold' size:10

    "

    "Modified: 30.4.1996 / 17:21:07 / cg"

!

family:familyString face:faceString style:styleString size:sizeNum

    "returns a font for given family, face, style and size with

     unspecified encoding. 

     The returned font is not associated to a specific device"

    ^ self family:familyString

	   face:faceString

	   style:styleString

	   size:sizeNum

	   encoding:nil

    "

     Font family:'helvetica' face:'medium' style:'roman'  size:10

     Font family:'helvetica' face:'medium' style:'italic' size:10

     Font family:'helvetica' face:'bold'   style:'roman'  size:10

     Font family:'courier'   face:'bold'   style:'italic' size:10

    "

!

family:familyString face:faceString style:styleString size:sizeNum encoding:encodingSym

    "returns a font for given family, face, style, size and

     the specified encoding. 

     The returned font is not associated to a specific device"

    ^ self new

          family:familyString 

          face:faceString 

          style:styleString 

          size:sizeNum 

          encoding:encodingSym

    "Modified: 20.4.1996 / 23:19:04 / cg"

!

family:familyString size:sizeNum

    "returns a font for given family and size with unspecified encoding.

     The new fonts face defaults to `medium', its style to `roman'.

     The returned font is not associated to a specific device"

    ^ self family:familyString

           face:'medium' 

           style:'roman' 

           size:sizeNum

           encoding:nil

    "

     Font family:'helvetica' size:10

     Font family:'courier' size:10

    "

    "Modified: 30.4.1996 / 17:21:40 / cg"

!

family:familyString style:aStyle size:sizeNum

    "returns a font for given family and size with unspecified encoding.

     The new fonts face defaults to `medium', its style to `roman'.

     The returned font is not associated to a specific device"

    ^ self family:familyString

           face:'medium' 

           style:aStyle 

           size:sizeNum

           encoding:nil

    "

     Font family:'helvetica' style:#roman size:48

     Font family:'courier' style:#roman size:10

    "

    "Modified: 30.4.1996 / 17:21:40 / cg"

    "Created: 8.10.1996 / 18:33:55 / cg"

!

name:aFontName

    "returns a font with the given explicit name.

     WARNING:

       You shuld not use explicit naming, since font names vary

       with operatingSystems, devices and architecture.

     This interface is provided for special purposes only.

     On X, the name given should be according the X fontname conventions;

     i.e. something like: '-*-times-bold-r-normal-*-*-240-*-*-*-*-iso8859-1'.

     On other devices, font naming may be completely different."

    ^ self family:aFontName 

           face:nil

           style:nil

           size:nil 

           encoding:nil

    "

     Font name:'-*-times-bold-r-normal-*-*-240-*-*-*-*-iso8859-1'

     Font name:'6x10'

     Font name:'k14'

     ((Font name:'k14') on:Display) encoding

    "

    "Modified: 30.4.1996 / 17:23:09 / cg"

! !

!FontDescription methodsFor:'accessing'!

encoding

    "return the fonts encoding, as a symbol

     such as #'iso8859', #'jis0208.1983' or #ascii.

     If the fonts encoding is not known, return nil; 

     You should assume ascii-encoding then."

    ^ encoding

    "Modified: 20.4.1996 / 23:14:36 / cg"

!

face

    "return the face, a string"

    ^ face

!

family

    "return the family, a string"

    ^ family

!

family:familyString face:faceString style:styleString size:sizeNum encoding:encodingString

    "set the instance values"

    family := familyString asSymbol.

    (faceString notNil and:[faceString notEmpty]) ifTrue:[

        face := faceString asSymbol.

    ].

    (styleString notNil and:[styleString notEmpty]) ifTrue:[

        style := styleString asSymbol.

    ].

    size := sizeNum.

    (encodingString notNil and:[encodingString notEmpty]) ifTrue:[

        encoding := encodingString asSymbol.

    ]

    "Modified: 20.4.1996 / 23:19:25 / cg"

!

size

    "return the size, a number"

    ^ size

!

style

    "return the style, a string"

    ^ style

! !

!FontDescription methodsFor:'comparing'!

= aFont

    "two fonts are considered equal, if the font-name components are;

     independent of the device, the font is on"

    (aFont species == self species) ifTrue:[

	(size == aFont size) ifTrue:[

	    (family = aFont family) ifTrue:[

		(face = aFont face) ifTrue:[

		    (style = aFont style) ifTrue:[

			(encoding == aFont encoding) ifTrue:[

			    ^ true

			]

		    ]

		]

	    ]

	]

    ].

    ^ false

! !

!FontDescription methodsFor:'converting'!

asBold

    "return the bold font corresponding to the receiver"

    ^ self class 

	family:family 

	face:'bold' 

	style:style 

	size:size 

	encoding:encoding

!

asItalic

    "return the italic font corresponding to the receiver"

    ^ self class 

	family:family 

	face:face 

	style:'oblique' 

	size:size 

	encoding:encoding

!

on:aDevice

    "given the receiver, return a device Font"

    ^ (Font

        family:family 

        face:face 

        style:style 

        size:size 

        encoding:encoding) on:aDevice

    "Modified: 29.2.1996 / 04:45:11 / cg"

!

size:newSize 

    "return a font corresponding to the receiver, but with different size."

    ^ self class 

	family:family 

	face:face 

	style:style 

	size:newSize

	encoding:encoding

! !

!FontDescription methodsFor:'errors'!

errorNoDevice

    "a query was made for device-specific info"

    "

     this happens, when you ask a font for its height or width,

     ascent or any other dimension which depends on the device on

     which the font is rendered, AND the receiver font is not (yet)

     associated to a device.

     You should always use 

	font := font on:someDevice

     to get a device font, before asking for device specifics.

    "

    self error:'query device independent font for for device specific info'

! !

!FontDescription methodsFor:'queries'!

bold

    "return true, if the receiver is a bold font -

     for st-80 compatibility"

    ^ face = 'bold' 

!

boldness

    "return the boldness of the characters in this font 0 .. 1 -

     for st-80 compatibility"

    style = 'roman' ifTrue:[^ 0.5].

    style = 'normal' ifTrue:[^ 0.5].

    style = 'bold' ifTrue:[^ 0.75].

    style = 'light' ifTrue:[^ 0.25].

    ^ 0.5

!

fullName

    ^ nil

    "Created: 23.2.1996 / 00:45:45 / cg"

!

italic

    "return true if this is an italic font -

     for st-80 compatibility"

    face = 'italic' ifTrue:[^ true].

    face = 'obligue' ifTrue:[^ true].

    ^ false

!

serif

    "return true, if this font has serifs"

    "this should be done in a better way ..."

    family = 'Times' ifTrue:[^ true].

    family = 'times' ifTrue:[^ true].

    ^ false.

!

species

    ^ Font

! !

!FontDescription methodsFor:'queries-encoding'!

isASCII

    "return true, if the receivers encoding is

     compatible with ascii (i.e. its ascii or iso8859)"

    ^ (encoding == #iso8859) or:[encoding == #ascii]

    "Created: 24.2.1996 / 22:47:30 / cg"

    "Modified: 20.4.1996 / 23:20:01 / cg"

!

isISO8859

    "return true, if the receivers encoding is

     compatible with iso8859 (i.e. iso8859)"

    ^ encoding == #iso8859

    "Created: 24.2.1996 / 22:47:12 / cg"

    "Modified: 20.4.1996 / 23:20:13 / cg"

!

isJIS

    "return true, if the receivers encoding is

     compatible with jis (i.e. jisXXX)"

    ^ (encoding startsWith:'jis')

    "Created: 24.2.1996 / 22:47:47 / cg"

    "Modified: 20.4.1996 / 23:20:30 / cg"

! !

!FontDescription  class methodsFor:'documentation'!

version

! !