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"
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COPYRIGHT (c) 1994 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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This is a demo example:
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THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTOR ``AS IS'' AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTOR BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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"
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FontDescription subclass:#BitmapFont
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instanceVariableNames:'characterBitmaps ascent descent width'
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classVariableNames:''
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poolDictionaries:''
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category:'Graphics-Support'
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!
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!BitmapFont class methodsFor:'documentation'!
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copyright
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"
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COPYRIGHT (c) 1994 by Claus Gittinger
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All Rights Reserved
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This software is furnished under a license and may be used
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only in accordance with the terms of that license and with the
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43 |
inclusion of the above copyright notice. This software may not
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be provided or otherwise made available to, or used by, any
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other person. No title to or ownership of the software is
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hereby transferred.
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This is a demo example:
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THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTOR ``AS IS'' AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE CONTRIBUTOR BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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"
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!
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documentation
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"
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This class demonstrates, that it is possible to define your own
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renderers for fonts - you could even write a class which reads
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a truetype font from a ttf file and display those
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(maybe someone finds the time to do this
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and provides the code to the public domain ?)
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Here is a simple & sample implementation of private bitmap fonts;
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Glyphs for each character are stored in the instance variable
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'characterBitmaps'.
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Some sample glyphs can be created with the class' sampleGlyphs method.
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The required protocol is found in drawing and accessing.
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1154
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[author:]
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Claus Gittinger
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[see also:]
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Font GraphicsContext
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1088
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"
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!
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examples
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"
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2545
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a label showing characters in a new bitmap font:
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[exBegin]
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|font l|
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font := (BitmapFont new glyphs:(BitmapFont sampleGlyhps)).
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font setAscent:13; setDescent:3.
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l := Label new.
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l font:font.
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l label:'aazzazaz'.
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l open.
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[exEnd]
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a label showing characters in a new smily font:
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[exBegin]
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|font l|
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font := (BitmapFont new glyphs:(BitmapFont smilyGlyhps)).
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font setAscent:16; setDescent:0.
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l := Label new.
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l font:font.
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l label:'aabbaaa'.
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l open.
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[exEnd]
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2545
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demonstrate, that this font can be used in listViews just as any other font:
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(well, missing character glyphs are blanked)
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[exBegin]
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|font top list|
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font := (BitmapFont new glyphs:(BitmapFont sampleGlyhps)).
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font setAscent:13; setDescent:3.
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top := ScrollableView forView:(list := SelectionInListView new).
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list font:font.
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list list:#('a' 'z' 'aaa' 'zzz' 'azaz' 'zaza' 'aa' 'az' 'za' 'hello' 'abcdef' 'xyz').
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top extent:200@200.
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top open.
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[exEnd]
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1088
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demonstrate, that this font can be used in textViews just as any other font:
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(well, missing character glyphs are blanked)
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[exBegin]
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|font top list|
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font := (BitmapFont new glyphs:(BitmapFont sampleGlyhps)).
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font setAscent:13; setDescent:3.
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top := ScrollableView forView:(list := EditTextView new).
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list font:font.
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list list:#('a' 'z' 'aaa' 'zzz' 'azaz' 'zaza' 'aa' 'az' 'za' 'hello' 'abcdef' 'xyz').
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top extent:200@200.
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top open.
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[exEnd]
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"
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! !
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!BitmapFont class methodsFor:'instance creation'!
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new
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|newFont|
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newFont := super new
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family:'private'
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face:nil
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style:nil
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size:nil
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encoding:nil.
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^ newFont
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"
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BitmapFont new glyphs:(self sampleGlyhps).
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"
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! !
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!BitmapFont class methodsFor:'private'!
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sampleGlyhps
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"return the bitmap array for a sample font
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(only contains glyphs for $a and $z)"
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|characters|
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characters := Array new:256.
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characters
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at:(Character space asciiValue + 1)
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put:(Form
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width:16
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height:16
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fromArray:#[2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000]).
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characters
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at:($a asciiValue + 1)
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put:(Form
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width:16
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height:16
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fromArray:#[2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00011111 2r11111000
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2r00011111 2r11111000
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2r00011000 2r00011000
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2r00011000 2r00011000
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2r00011000 2r00011000
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2r00011000 2r00011000
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2r00011000 2r00011000
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2r00011000 2r00011000
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2r00011111 2r11111110
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2r00011111 2r11111110
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000]).
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characters
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at:($z asciiValue + 1)
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put:(Form
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width:16
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height:16
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fromArray:#[2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00011111 2r11111000
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2r00011111 2r11111000
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2r00000000 2r00110000
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2r00000000 2r01100000
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2r00011111 2r11111000
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2r00011111 2r11111000
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2r00000110 2r00000000
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2r00001100 2r00000000
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2r00011111 2r11111000
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2r00011111 2r11111000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000]).
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^ characters
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!
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smilyGlyhps
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"return the bitmap array for a smily font
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(only contains glyphs for $a, $b and $c)"
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1088
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|characters|
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characters := Array new:256.
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characters
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at:(Character space asciiValue + 1)
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put:(Form
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width:16
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height:16
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fromArray:#[2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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262 |
2r00000000 2r00000000
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263 |
2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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267 |
2r00000000 2r00000000
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2r00000000 2r00000000
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2r00000000 2r00000000
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270 |
2r00000000 2r00000000
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271 |
2r00000000 2r00000000
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2r00000000 2r00000000
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273 |
2r00000000 2r00000000]).
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1088
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characters
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at:($a asciiValue + 1)
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put:(Form
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width:16
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height:16
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fromArray:#[2r00000001 2r10000000
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2r00001110 2r01110000
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2r00011000 2r00011000
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2r00100000 2r00000100
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2r01100110 2r01100110
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2r01000110 2r01100010
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2r01000000 2r00000010
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2r10000001 2r00000001
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288 |
2r10000001 2r00000001
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289 |
2r01001000 2r00010010
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2r01001100 2r00110010
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2r01100111 2r11100110
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2r00100001 2r10000100
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293 |
2r00011000 2r00011000
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294 |
2r00001110 2r01110000
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2r00000001 2r10000000]).
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1088
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296 |
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297 |
characters
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2545
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at:($b asciiValue + 1)
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put:(Form
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width:16
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height:16
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fromArray:#[2r00000001 2r10000000
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303 |
2r00001110 2r01110000
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304 |
2r00011000 2r00011000
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305 |
2r00100000 2r00000100
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306 |
2r01100110 2r01100110
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307 |
2r01000110 2r01100010
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308 |
2r01000000 2r00000010
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309 |
2r10000001 2r00000001
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310 |
2r10000001 2r00000001
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311 |
2r01000000 2r00000010
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312 |
2r01000001 2r10000010
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313 |
2r01100010 2r01000110
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314 |
2r00100010 2r01000100
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315 |
2r00011000 2r00011000
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316 |
2r00001110 2r01110000
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317 |
2r00000001 2r10000000]).
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1088
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318 |
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319 |
characters
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2545
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320 |
at:($c asciiValue + 1)
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321 |
put:(Form
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322 |
width:16
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323 |
height:16
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324 |
fromArray:#[2r00000001 2r10000000
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325 |
2r00001110 2r01110000
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326 |
2r00011000 2r00011000
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327 |
2r00100000 2r00000100
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328 |
2r01100110 2r01100110
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329 |
2r01000110 2r01100010
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330 |
2r01000000 2r00000010
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331 |
2r10000001 2r00000001
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332 |
2r10000001 2r00000001
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333 |
2r01000000 2r00000010
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334 |
2r01000001 2r10000010
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335 |
2r01100011 2r11000110
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336 |
2r00100011 2r11000100
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337 |
2r00011001 2r10011000
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338 |
2r00001110 2r01110000
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339 |
2r00000001 2r10000000]).
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1088
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340 |
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341 |
^ characters
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342 |
! !
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343 |
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344 |
!BitmapFont methodsFor:'accessing'!
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345 |
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346 |
glyphs:aGlyphArray
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1154
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347 |
"set the glyphs array; that is the collection of
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348 |
bitmaps - one for each character"
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349 |
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1088
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350 |
characterBitmaps := aGlyphArray.
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2545
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351 |
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width := aGlyphArray
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353 |
inject:0
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354 |
into:[:max :glyph | glyph isNil ifTrue:[
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355 |
max
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356 |
] ifFalse:[
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357 |
max max:glyph width
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358 |
]
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359 |
]
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1088
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360 |
!
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361 |
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362 |
setAscent:aNumber
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1154
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363 |
"set the fonts ascent; that is the number of pixels
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364 |
above the fonts baseline"
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365 |
|
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1088
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366 |
ascent := aNumber.
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|
367 |
!
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368 |
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369 |
setDescent:aNumber
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1154
|
370 |
"set the fonts ascent; that is the number of pixels
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371 |
below the fonts baseline"
|
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372 |
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1088
|
373 |
descent := aNumber.
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|
374 |
! !
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375 |
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376 |
!BitmapFont methodsFor:'drawing'!
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377 |
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378 |
displayOpaqueString:aString from:index1 to:index2 x:x0 y:y in:aGC
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|
1154
|
379 |
"required protocol for new fonts:
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|
|
380 |
- display part of a string, drawing both fore- and background pixels"
|
|
|
381 |
|
|
1088
|
382 |
|x|
|
|
|
383 |
|
|
|
384 |
x := x0.
|
|
|
385 |
index1 to:index2 do:[:index |
|
|
1154
|
386 |
self drawCharacter:(aString at:index) asciiValue in:aGC x:x y:y opaque:true.
|
|
|
387 |
x := x + (self widthOfCharacter:(aString at:index) asciiValue)
|
|
1088
|
388 |
]
|
|
|
389 |
!
|
|
|
390 |
|
|
|
391 |
displayString:aString from:index1 to:index2 x:x0 y:y in:aGC
|
|
1154
|
392 |
"required protocol for new fonts:
|
|
|
393 |
- display part of a string, drawing foreground pixels only"
|
|
|
394 |
|
|
1088
|
395 |
|x|
|
|
|
396 |
|
|
|
397 |
x := x0.
|
|
|
398 |
index1 to:index2 do:[:index |
|
|
1154
|
399 |
self drawCharacter:(aString at:index) asciiValue in:aGC x:x y:y opaque:false.
|
|
|
400 |
x := x + (self widthOfCharacter:(aString at:index) asciiValue)
|
|
1088
|
401 |
]
|
|
1154
|
402 |
! !
|
|
|
403 |
|
|
|
404 |
!BitmapFont methodsFor:'private - drawing'!
|
|
1088
|
405 |
|
|
|
406 |
drawCharacter:ascii in:aGC x:x y:y opaque:opaque
|
|
|
407 |
|glyph|
|
|
|
408 |
|
|
2545
|
409 |
glyph := characterBitmaps at:(ascii + 1) ifAbsent:nil.
|
|
1088
|
410 |
glyph isNil ifTrue:[^ self].
|
|
2545
|
411 |
opaque ifTrue:[
|
|
|
412 |
aGC displayOpaqueForm:glyph x:x y:y-ascent
|
|
|
413 |
] ifFalse:[
|
|
|
414 |
aGC displayForm:glyph x:x y:y-ascent
|
|
|
415 |
]
|
|
1088
|
416 |
! !
|
|
|
417 |
|
|
1154
|
418 |
!BitmapFont methodsFor:'private - queries'!
|
|
|
419 |
|
|
|
420 |
heightOfCharacter:ascii
|
|
|
421 |
"return the height of a specific character"
|
|
|
422 |
|
|
|
423 |
|glyph|
|
|
|
424 |
|
|
2545
|
425 |
glyph := characterBitmaps at:(ascii + 1) ifAbsent:nil.
|
|
1154
|
426 |
glyph isNil ifTrue:[
|
|
2545
|
427 |
glyph := characterBitmaps at:(Character space asciiValue + 1).
|
|
1154
|
428 |
].
|
|
|
429 |
glyph isNil ifTrue:[^ 0].
|
|
|
430 |
^ glyph height
|
|
|
431 |
!
|
|
|
432 |
|
|
|
433 |
widthOfCharacter:ascii
|
|
|
434 |
"return the width of a specific character"
|
|
|
435 |
|
|
|
436 |
|glyph|
|
|
|
437 |
|
|
2545
|
438 |
glyph := characterBitmaps at:(ascii + 1) ifAbsent:nil.
|
|
1154
|
439 |
glyph isNil ifTrue:[
|
|
2545
|
440 |
glyph := characterBitmaps at:(Character space asciiValue + 1).
|
|
1154
|
441 |
].
|
|
|
442 |
glyph isNil ifTrue:[^ 0].
|
|
|
443 |
^ glyph width
|
|
|
444 |
! !
|
|
|
445 |
|
|
1088
|
446 |
!BitmapFont methodsFor:'queries'!
|
|
|
447 |
|
|
|
448 |
ascent
|
|
|
449 |
"return the ascent - the number of pixels above the baseLine"
|
|
|
450 |
|
|
|
451 |
^ ascent
|
|
|
452 |
!
|
|
|
453 |
|
|
|
454 |
ascentOn:aDevice
|
|
2545
|
455 |
"return the descent - the number of pixels below the baseLine.
|
|
|
456 |
Since I am not device dependent, return my pixel ascent."
|
|
1088
|
457 |
|
|
2545
|
458 |
^ descent
|
|
1088
|
459 |
!
|
|
|
460 |
|
|
|
461 |
descent
|
|
|
462 |
"return the descent - the number of pixels below the baseLine"
|
|
|
463 |
|
|
|
464 |
^ descent
|
|
|
465 |
!
|
|
|
466 |
|
|
|
467 |
descentOn:aDevice
|
|
2545
|
468 |
"return the descent - the number of pixels below the baseLine.
|
|
|
469 |
Since I am not device dependent, return my pixel descent."
|
|
1088
|
470 |
|
|
|
471 |
^ descent
|
|
|
472 |
!
|
|
|
473 |
|
|
|
474 |
height
|
|
|
475 |
"return the height - the height in pixels of the highest character"
|
|
|
476 |
|
|
|
477 |
^ descent + ascent.
|
|
|
478 |
!
|
|
|
479 |
|
|
|
480 |
heightOf:aString
|
|
|
481 |
"return the height - the height in pixels of the highest character"
|
|
|
482 |
|
|
|
483 |
^ descent + ascent.
|
|
|
484 |
!
|
|
|
485 |
|
|
|
486 |
heightOn:aDevice
|
|
|
487 |
"return the height - the height in pixels of the highest character"
|
|
|
488 |
|
|
|
489 |
^ descent + ascent.
|
|
|
490 |
!
|
|
|
491 |
|
|
|
492 |
isFixedWidth
|
|
|
493 |
"return true if all of the fonts characters are equal in
|
|
|
494 |
width."
|
|
|
495 |
|
|
|
496 |
^ true
|
|
|
497 |
!
|
|
|
498 |
|
|
|
499 |
maxAscent
|
|
1154
|
500 |
"return the maximum ascent; thats the ascent of the highest
|
|
|
501 |
character"
|
|
|
502 |
|
|
1088
|
503 |
^ ascent.
|
|
|
504 |
!
|
|
|
505 |
|
|
1154
|
506 |
maxDescent
|
|
|
507 |
"return the maximum descent; thats the descent of the highest
|
|
|
508 |
character"
|
|
|
509 |
|
|
|
510 |
^ descent.
|
|
|
511 |
!
|
|
|
512 |
|
|
1088
|
513 |
maxHeight
|
|
1154
|
514 |
"return the maximum height; thats the height of the highest
|
|
|
515 |
character"
|
|
|
516 |
|
|
1088
|
517 |
^ descent + ascent.
|
|
|
518 |
!
|
|
|
519 |
|
|
1154
|
520 |
maxWidth
|
|
|
521 |
"return the maximum width - the width of the widest character in pixels"
|
|
|
522 |
|
|
|
523 |
^ width
|
|
|
524 |
!
|
|
|
525 |
|
|
1088
|
526 |
on:aDevice
|
|
2545
|
527 |
"return a device representation of the receiver.
|
|
|
528 |
Since I am device independent, return the receiver."
|
|
|
529 |
|
|
|
530 |
^ self
|
|
|
531 |
!
|
|
|
532 |
|
|
|
533 |
onDevice:aDevice
|
|
|
534 |
"return a device representation of the receiver.
|
|
|
535 |
Since I am device independent, return the receiver."
|
|
1088
|
536 |
|
|
|
537 |
^ self
|
|
|
538 |
!
|
|
|
539 |
|
|
|
540 |
width
|
|
|
541 |
"return the width - the average width in pixels"
|
|
|
542 |
|
|
|
543 |
^ width
|
|
|
544 |
!
|
|
|
545 |
|
|
|
546 |
widthOf:aString from:start to:stop
|
|
|
547 |
"return the width of a substring"
|
|
|
548 |
|
|
|
549 |
|sumW|
|
|
|
550 |
|
|
|
551 |
(stop < start) ifTrue:[^ 0].
|
|
|
552 |
sumW := 0.
|
|
|
553 |
start to:stop do:[:index |
|
|
|
554 |
sumW := sumW + (self widthOfCharacter:(aString at:index) asciiValue)
|
|
|
555 |
].
|
|
|
556 |
^ sumW
|
|
|
557 |
!
|
|
|
558 |
|
|
1154
|
559 |
widthOf:aString from:startIndex to:endIndex on:aDevice
|
|
|
560 |
"return the width of a substring"
|
|
1088
|
561 |
|
|
1154
|
562 |
^ self widthOf:aString from:startIndex to:endIndex
|
|
1088
|
563 |
!
|
|
|
564 |
|
|
|
565 |
widthOn:aDevice
|
|
|
566 |
"return the width - the average width in pixels"
|
|
|
567 |
|
|
|
568 |
^ width
|
|
|
569 |
! !
|
|
|
570 |
|
|
|
571 |
!BitmapFont class methodsFor:'documentation'!
|
|
|
572 |
|
|
|
573 |
version
|
|
2545
|
574 |
^ '$Header: /cvs/stx/stx/libview/BitmapFont.st,v 1.3 1999-03-30 17:41:20 cg Exp $'
|
|
1088
|
575 |
! !
|