"

 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

       instanceVariableNames:'family face style size encoding'

       classVariableNames:''

       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.

"

!

version

!

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)

"

! !

!FontDescription class methodsFor:'instance creation'!

name:aFontName

    "returns a font with the given explicit name.

     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'."

    ^ self family:aFontName 

	   face:nil

	   style:nil

	   size:nil 

	   encoding:nil

    "

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

    "

!

family:familyString

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

     with unspecified encoding.

     Face is taken as medium, style as 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'

    "

!

family:familyString size:sizeNum

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

     Face is taken as medium, style as 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

    "

!

family:familyString face:faceString size:sizeNum

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

     Style is taken as 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

    "

!

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

    ^ self new

	  family:familyString 

	  face:faceString 

	  style:styleString 

	  size:sizeNum 

	  encoding:encodingSym

! !

!FontDescription methodsFor:'accessing'!

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

    family := familyString asSymbol.

    faceString notNil ifTrue:[

	face := faceString asSymbol.

    ].

    styleString notNil ifTrue:[

	style := styleString asSymbol.

    ].

    size := sizeNum.

    encodingString notNil ifTrue:[

	encoding := encodingString asSymbol.

    ]

!

family

    "return the family, a string"

    ^ family

!

face

    "return the face, a string"

    ^ face

!

style

    "return the style, a string"

    ^ style

!

size

    "return the size, a number"

    ^ size

!

encoding

    "return the encoding, a symbol such as #iso8859"

    ^ encoding

! !

!FontDescription methodsFor:'queries'!

species

    ^ Font

!

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.

!

italic

    "return true if this is an italic font -

     for st-80 compatibility"

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

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

    ^ false

!

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

! !

!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:'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'!

on:aDevice

    "given the receiver, return a device Font"

    ^ (Font

	family:family 

	face:'bold' 

	style:style 

	size:size 

	encoding:encoding) on:aDevice

! 

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

!

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

! !