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{Font2D|_tool}



CLASS {Font2D|_tool}
, UNTESTED :








A class to control a font used while drawing with {OpenGL}.



IMPORT : 
{Font}
, 
{AL4_font}
, 
{OpenGL}
, 
{Bitmap_direct}
, 
{Bitmap}
, 
{Geometry}
, 
{Canvas}
 .


BASE CLASS 
{Font} .




------------------------------------------------------------ 'construction'

 







FUN 
New_font_2D

(
STR 
F|ace_name
, 
REAL 
S|ize_font
)
 ==> {Font2D} 
 , NEW








------------------------------------------------------------------- 'style'

 






OVERRIDE 
Set_style

(

     {Font}.{font_attr} 
A|ttribute_to_set
, 

     BOOL 
Set|_or_clear
)








----------------------------------------------------------------- 'charset'

 






OVERRIDE 
Set_charset

(
INT 
C|harset_value
)








------------------------------------------------------------- 'text colour'


INT 
Color|_of_text
 , READ





 






METHOD 
Set_color

(
INT 
C|olor_value
)








----------------------------------------------------------------- 'kerning'


INT 
Kerning|_between_letters_in_pixels_can_be_negative
 , READ





 






METHOD 
Set_kerning|_additional_to_system_defined

(
INT 
K|erning_value
)








--------------------- 'all characters which can be printed using this font'


STR 
Chars|_in_font
 , READ





  






METHOD 
Add|_chars_from_string

(
STR 
S|tring_containing_chars_to_add
)











METHOD 
Clear|_chars_collection_and_reset_font_texture









---------------------------------------- 'preferred texture size in pixels'

 






METHOD 
Set_texture_size|_desired

(

     INT 
Bitmap_w|idth
, 

     INT 
Bitmap_h|eight
)
 , IF Bitmap_w IS CONST , THEN Bitmap_w IN [128, 256, 512, 1024, 2048, 4096],
    IF Bitmap_h IS CONST , THEN Bitmap_h IN [128, 256, 512, 1024, 2048, 4096]
    :








------------------------------------------------------ 'use mipmaps or not'


BOOL 
Mipmaps|_use_to_build_font_default_TRUE
 , READ





 






METHOD 
Set_mipmaps|_use

(
BOOL 
Use|_mipmaps
)








--------------------------------- 'some values calculated while preparing:'


INT 
Maximal_width|_of_characters
 , READ






REAL 
Average_width|_of_character
 , READ






INT 
Height_char|acters_same_for_all_characters
 , READ






INT 
Space_width|_if_not_set_average_width_will_be_used







--------------------------------------------------------- 'prepare texture'

   






METHOD 
Prepare|_texture

 ==> INT 







CONSTANT REAL 
:

          FIX_WIDTH_CHAR = 0.4 
 .











METHOD 
Load|_texture_build_lists

(

     {Bitmap_direct} 
B|itmap_chars_drawn
)
 ==> INT 








----------------------------------------------- 'text painting on {OpenGL}'

  






METHOD 
Draw_at|_XY_string

(

     STR 
S|tring_to_draw
, 

     REAL 
X|_offset
, 

     REAL 
Y|_offset
)
 ==> REAL 











METHOD 
Draw|_string_return_width_drawn

(

     STR 
S|tring_to_draw
)
 ==> REAL 







END