Home » Archimedes archive » Acorn Computing » 1994 02.adf » 9402 » FontManage/Example4

FontManage/Example4

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

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File contents
   10REM > Example4
   20REM Example of Font Manager use - justified text
   30REM by Ben Summers
   40
   50
   60REM first check to see if we have the RISC OS 3.1 font manager
   70SYS "Font_CacheAddr" TO version%
   80IF version% < 300 THEN ERROR 0,"Font Manager too old"
   90
  100REM find a suitible mode (multisync if possible)
  110SYS "OS_CheckModeValid",20 TO ;f%
  120IF (f% AND 2) = 2 THEN MODE 12 ELSE MODE 20
  130OFF
  140
  150white%  = &FFFFFF00
  160black%  = &00000000
  170
  180REM set palette for white on black
  190SYS "Font_SetPalette",,0,1,14,black%,white%,&65757254
  200
  210REM ok, let's find a font...
  220size% = 18 * 16
  230SYS "Font_FindFont",,"Trinity.Medium",size%,size%,0,0 TO font%
  240
  250
  260REM width of column of text
  270width% = 448
  280
  290REM position of text
  300x% = 128
  310y% = 768
  320
  330REM line spacing
  340spacing% = -52
  350
  360
  370REM set text to use
  380text$ = "This is some text to try some justification. First we'll do a quick left justification, followed by a fully justified bit of text and then finally a right justification... It's really exciting... Why not press any key to see the next bit..."
  390REM put text in a block of memory.
  400DIM text% 256
  410$text% = text$
  420
  430SYS "ColourTrans_SetFontColours",font%,black%,white%,14
  440SYS "Font_Paint",font%,"Left justified text",784,0,960
  450PROCdraw_edges
  460
  470REM length of string
  480length% = LEN(text$)
  490REM location within string
  500loc% = 0
  510
  520cy% = y%
  530
  540DIM cb% 64
  550
  560REPEAT
  570  REM this is a coordinate block, the first too entries give additional
  580  REM   x,y offsets on spaces, then the additional x,y offsets between
  590  REM   each letter. The bit we're really interested in is the fifth
  600  REM   entry, which is the character to split lines at. (space)
  610  cb%!0 = 0
  620  cb%!4 = 0
  630  cb%!8 = 0
  640  cb%!12 = 0
  650  cb%!16 = 32
  660
  670  REM convert the size of the columns into milli-points for ScanString...
  680  REM   it doesn't like OS units
  690  SYS "Font_Converttopoints",,width%,1024 TO ,jx%,jy%
  700
  710  REM 800 here is another magic number to find out where to split the string
  720  SYS "Font_ScanString",font%,text%+loc%,800,jx%,jy%,cb% TO ,split%
  730
  740  split% -= text% + loc%
  750  REM split% is the number of characters to plot
  760
  770  REM and paint it onto the screen
  780  SYS "Font_Paint",font%,MID$(text$,loc%+1,split%),784,x%,cy%
  790
  800  loc% += split% + 1
  810  cy%  += spacing%
  820UNTIL loc% >= length%
  830
  840G = GET
  850
  860CLS
  870
  880SYS "Font_Paint",font%,"Fully justified text",784,0,960
  890PROCdraw_edges
  900
  910loc% = 0
  920cy% = y%
  930
  940REPEAT
  950  cb%!0 = 0
  960  cb%!4 = 0
  970  cb%!8 = 0
  980  cb%!12 = 0
  990  cb%!16 = 32
 1000
 1010  SYS "Font_Converttopoints",,width%,1024 TO ,jx%,jy%
 1020  SYS "Font_ScanString",font%,text%+loc%,800,jx%,jy%,cb% TO ,split%
 1030
 1040  split% -= text% + loc%
 1050  REM split% is the number of characters to plot
 1060
 1070  REM right, this is where it gets complex. Firstly, we set the far right of
 1080  REM   the justification using the graphics cursor (the MOVE command). Then,
 1090  REM   we work out whether we need to justify the particular line ('cos we
 1100  REM   don't on the last one) and then use the appropriate magic number.
 1110  MOVE x%+width%,cy%
 1120  IF (loc%+split%+1) <= length% THEN
 1130    SYS "Font_Paint",font%,MID$(text$,loc%+1,split%),785,x%,cy%
 1140  ELSE
 1150    SYS "Font_Paint",font%,MID$(text$,loc%+1,split%),784,x%,cy%
 1160  ENDIF
 1170
 1180  loc% += split% + 1
 1190  cy%  += spacing%
 1200UNTIL loc% >= length%
 1210
 1220G = GET
 1230
 1240CLS
 1250
 1260SYS "Font_Paint",font%,"Right justified text",784,0,960
 1270PROCdraw_edges
 1280
 1290loc% = 0
 1300cy% = y%
 1310
 1320REPEAT
 1330  cb%!0 = 0
 1340  cb%!4 = 0
 1350  cb%!8 = 0
 1360  cb%!12 = 0
 1370  cb%!16 = 32
 1380
 1390  SYS "Font_Converttopoints",,width%,1024 TO ,jx%,jy%
 1400
 1410  REM the new magic number here means 'return the bounding box of the string
 1420  REM   in the block' which here is cb%.
 1430  SYS "Font_ScanString",font%,text%+loc%,&40320,jx%,jy%,cb% TO ,split%
 1440
 1450  split% -= text% + loc%
 1460
 1470  REM convert the bounding box returned to absolute sizes in OS units
 1480  SYS "Font_ConverttoOS",,cb%!28 - cb%!20,cb%!32 - cb%!24 TO ,text_x%,text_y%
 1490
 1500  REM split% is the number of characters to plot
 1510  SYS "Font_Paint",font%,MID$(text$,loc%+1,split%),784,x% + width% - text_x%,cy%
 1520
 1530  loc%+=split% + 1
 1540  cy% += spacing%
 1550UNTIL loc% >= length%
 1560
 1570REM and finally, lose the font...
 1580SYS "Font_LoseFont",font%
 1590
 1600PRINT '''
 1610
 1620END
 1630
 1640DEFPROCdraw_edges
 1650  COLOUR 12
 1660  RECTANGLEFILL x%,0,-4,y%-spacing%
 1670  RECTANGLEFILL x%+width%,0,4,y%-spacing%
 1680ENDPROC

� > Example4
2� Example of Font Manager use - justified text
� by Ben Summers
(
2
<@� first check to see if we have the RISC OS 3.1 font manager
F"ș "Font_CacheAddr" � version%
P1� version% < 300 � � 0,"Font Manager too old"
Z
d2� find a suitible mode (multisync if possible)
n#ș "OS_CheckModeValid",20 � ;f%
x � (f% � 2) = 2 � � 12 � � 20
��
�
�white%  = &FFFFFF00
�black%  = &00000000
�
�$� set palette for white on black
�8ș "Font_SetPalette",,0,1,14,black%,white%,&65757254
�
�� ok, let's find a font...
�size% = 18 * 16
�@ș "Font_FindFont",,"Trinity.Medium",size%,size%,0,0 � font%
�
�
� width of column of text
width% = 448

"� position of text
,x% = 128
6y% = 768
@
J� line spacing
Tspacing% = -52
^
h
r� set text to use
|�text$ = "This is some text to try some justification. First we'll do a quick left justification, followed by a fully justified bit of text and then finally a right justification... It's really exciting... Why not press any key to see the next bit..."
�$� put text in a block of memory.
�� text% 256
�$text% = text$
�
�:ș "ColourTrans_SetFontColours",font%,black%,white%,14
�9ș "Font_Paint",font%,"Left justified text",784,0,960
��draw_edges
�
�� length of string
�length% = �(text$)
�� location within string
�loc% = 0
�
cy% = y%

� cb% 64
&
0�
:I  � this is a coordinate block, the first too entries give additional
DH  �   x,y offsets on spaces, then the additional x,y offsets between
NF  �   each letter. The bit we're really interested in is the fifth
XB  �   entry, which is the character to split lines at. (space)
b  cb%!0 = 0
l  cb%!4 = 0
v  cb%!8 = 0
�  cb%!12 = 0
�  cb%!16 = 32
�
�K  � convert the size of the columns into milli-points for ScanString...
�"  �   it doesn't like OS units
�7  ș "Font_Converttopoints",,width%,1024 � ,jx%,jy%
�
�N  � 800 here is another magic number to find out where to split the string
�E  ș "Font_ScanString",font%,text%+loc%,800,jx%,jy%,cb% � ,split%
�
�  split% -= text% + loc%
�2  � split% is the number of characters to plot
�
$  � and paint it onto the screen
<  ș "Font_Paint",font%,�text$,loc%+1,split%),784,x%,cy%

   loc% += split% + 1
*  cy%  += spacing%
4� loc% >= length%
>
H	G = �
R
\�
f
p:ș "Font_Paint",font%,"Fully justified text",784,0,960
z�draw_edges
�
�loc% = 0
�cy% = y%
�
��
�  cb%!0 = 0
�  cb%!4 = 0
�  cb%!8 = 0
�  cb%!12 = 0
�  cb%!16 = 32
�
�7  ș "Font_Converttopoints",,width%,1024 � ,jx%,jy%
�E  ș "Font_ScanString",font%,text%+loc%,800,jx%,jy%,cb% � ,split%

  split% -= text% + loc%
2  � split% is the number of characters to plot
$
.N  � right, this is where it gets complex. Firstly, we set the far right of
8O  �   the justification using the graphics cursor (the MOVE command). Then,
BM  �   we work out whether we need to justify the particular line ('cos we
LK  �   don't on the last one) and then use the appropriate magic number.
V  � x%+width%,cy%
`$  � (loc%+split%+1) <= length% �
j>    ș "Font_Paint",font%,�text$,loc%+1,split%),785,x%,cy%
t  �
~>    ș "Font_Paint",font%,�text$,loc%+1,split%),784,x%,cy%
�  �
�
�  loc% += split% + 1
�  cy%  += spacing%
�� loc% >= length%
�
�	G = �
�
��
�
�:ș "Font_Paint",font%,"Right justified text",784,0,960
��draw_edges


loc% = 0
cy% = y%

(�
2  cb%!0 = 0
<  cb%!4 = 0
F  cb%!8 = 0
P  cb%!12 = 0
Z  cb%!16 = 32
d
n7  ș "Font_Converttopoints",,width%,1024 � ,jx%,jy%
x
�N  � the new magic number here means 'return the bounding box of the string
�*  �   in the block' which here is cb%.
�H  ș "Font_ScanString",font%,text%+loc%,&40320,jx%,jy%,cb% � ,split%
�
�  split% -= text% + loc%
�
�G  � convert the bounding box returned to absolute sizes in OS units
�O  ș "Font_ConverttoOS",,cb%!28 - cb%!20,cb%!32 - cb%!24 � ,text_x%,text_y%
�
�2  � split% is the number of characters to plot
�O  ș "Font_Paint",font%,�text$,loc%+1,split%),784,x% + width% - text_x%,cy%
�
�  loc%+=split% + 1
  cy% += spacing%
� loc% >= length%

"#� and finally, lose the font...
,ș "Font_LoseFont",font%
6
@	� '''
J
T�
^
h��draw_edges
r
  � 12
|  ȓȐ x%,0,-4,y%-spacing%
�$  ȓȐ x%+width%,0,4,y%-spacing%
��
�
00000000  0d 00 0a 10 f4 20 3e 20  45 78 61 6d 70 6c 65 34  |..... > Example4|
00000010  0d 00 14 32 f4 20 45 78  61 6d 70 6c 65 20 6f 66  |...2. Example of|
00000020  20 46 6f 6e 74 20 4d 61  6e 61 67 65 72 20 75 73  | Font Manager us|
00000030  65 20 2d 20 6a 75 73 74  69 66 69 65 64 20 74 65  |e - justified te|
00000040  78 74 0d 00 1e 14 f4 20  62 79 20 42 65 6e 20 53  |xt..... by Ben S|
00000050  75 6d 6d 65 72 73 0d 00  28 04 0d 00 32 04 0d 00  |ummers..(...2...|
00000060  3c 40 f4 20 66 69 72 73  74 20 63 68 65 63 6b 20  |<@. first check |
00000070  74 6f 20 73 65 65 20 69  66 20 77 65 20 68 61 76  |to see if we hav|
00000080  65 20 74 68 65 20 52 49  53 43 20 4f 53 20 33 2e  |e the RISC OS 3.|
00000090  31 20 66 6f 6e 74 20 6d  61 6e 61 67 65 72 0d 00  |1 font manager..|
000000a0  46 22 c8 99 20 22 46 6f  6e 74 5f 43 61 63 68 65  |F".. "Font_Cache|
000000b0  41 64 64 72 22 20 b8 20  76 65 72 73 69 6f 6e 25  |Addr" . version%|
000000c0  0d 00 50 31 e7 20 76 65  72 73 69 6f 6e 25 20 3c  |..P1. version% <|
000000d0  20 33 30 30 20 8c 20 85  20 30 2c 22 46 6f 6e 74  | 300 . . 0,"Font|
000000e0  20 4d 61 6e 61 67 65 72  20 74 6f 6f 20 6f 6c 64  | Manager too old|
000000f0  22 0d 00 5a 04 0d 00 64  32 f4 20 66 69 6e 64 20  |"..Z...d2. find |
00000100  61 20 73 75 69 74 69 62  6c 65 20 6d 6f 64 65 20  |a suitible mode |
00000110  28 6d 75 6c 74 69 73 79  6e 63 20 69 66 20 70 6f  |(multisync if po|
00000120  73 73 69 62 6c 65 29 0d  00 6e 23 c8 99 20 22 4f  |ssible)..n#.. "O|
00000130  53 5f 43 68 65 63 6b 4d  6f 64 65 56 61 6c 69 64  |S_CheckModeValid|
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000001e0  22 2c 2c 30 2c 31 2c 31  34 2c 62 6c 61 63 6b 25  |",,0,1,14,black%|
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00000200  34 0d 00 c8 04 0d 00 d2  1e f4 20 6f 6b 2c 20 6c  |4......... ok, l|
00000210  65 74 27 73 20 66 69 6e  64 20 61 20 66 6f 6e 74  |et's find a font|
00000220  2e 2e 2e 0d 00 dc 13 73  69 7a 65 25 20 3d 20 31  |.......size% = 1|
00000230  38 20 2a 20 31 36 0d 00  e6 40 c8 99 20 22 46 6f  |8 * 16...@.. "Fo|
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00000260  69 7a 65 25 2c 73 69 7a  65 25 2c 30 2c 30 20 b8  |ize%,size%,0,0 .|
00000270  20 66 6f 6e 74 25 0d 00  f0 04 0d 00 fa 04 0d 01  | font%..........|
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000003d0  69 63 61 74 69 6f 6e 2e  2e 2e 20 49 74 27 73 20  |ication... It's |
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00000440  6f 72 79 2e 0d 01 90 0f  de 20 74 65 78 74 25 20  |ory...... text% |
00000450  32 35 36 0d 01 9a 12 24  74 65 78 74 25 20 3d 20  |256....$text% = |
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00000520  20 6c 6f 63 61 74 69 6f  6e 20 77 69 74 68 69 6e  | location within|
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00000560  20 36 34 0d 02 26 04 0d  02 30 05 f5 0d 02 3a 49  | 64..&...0....:I|
00000570  20 20 f4 20 74 68 69 73  20 69 73 20 61 20 63 6f  |  . this is a co|
00000580  6f 72 64 69 6e 61 74 65  20 62 6c 6f 63 6b 2c 20  |ordinate block, |
00000590  74 68 65 20 66 69 72 73  74 20 74 6f 6f 20 65 6e  |the first too en|
000005a0  74 72 69 65 73 20 67 69  76 65 20 61 64 64 69 74  |tries give addit|
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00000660  20 63 68 61 72 61 63 74  65 72 20 74 6f 20 73 70  | character to sp|
00000670  6c 69 74 20 6c 69 6e 65  73 20 61 74 2e 20 28 73  |lit lines at. (s|
00000680  70 61 63 65 29 0d 02 62  0f 20 20 63 62 25 21 30  |pace)..b.  cb%!0|
00000690  20 3d 20 30 0d 02 6c 0f  20 20 63 62 25 21 34 20  | = 0..l.  cb%!4 |
000006a0  3d 20 30 0d 02 76 0f 20  20 63 62 25 21 38 20 3d  |= 0..v.  cb%!8 =|
000006b0  20 30 0d 02 80 10 20 20  63 62 25 21 31 32 20 3d  | 0....  cb%!12 =|
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000006d0  20 33 32 0d 02 94 04 0d  02 9e 4b 20 20 f4 20 63  | 32.......K  . c|
000006e0  6f 6e 76 65 72 74 20 74  68 65 20 73 69 7a 65 20  |onvert the size |
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00000710  20 66 6f 72 20 53 63 61  6e 53 74 72 69 6e 67 2e  | for ScanString.|
00000720  2e 2e 0d 02 a8 22 20 20  f4 20 20 20 69 74 20 64  |....."  .   it d|
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00001110  0d ff                                             |..|
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