mirror of
https://github.com/pyrollo/display_modpack.git
synced 2024-11-11 12:40:36 +01:00
146 lines
5.3 KiB
Markdown
146 lines
5.3 KiB
Markdown
# Font Lib API
|
|
This document describes Font Lib API. Font Lib creates textures for font display on entities.
|
|
|
|
## Settings
|
|
### default_font
|
|
Name of the font to be used when no font is given. The font should be registered.
|
|
|
|
If no default\_font given or if default\_font given but not registered, the first registered font will be used as default.
|
|
|
|
## Provided methods
|
|
|
|
### font_api.get_default_font_name()
|
|
Returns de default font name.
|
|
|
|
### font_api.register_font(font_name, font_def)
|
|
Register a new font.
|
|
**font_name**: Name of the font to register. If registering different sizes of the same font, add size in the font name (e.g. times_10, times_12...).
|
|
**font_def**: Font definition table (see **Font definition table** below).
|
|
|
|
### font_api.on_display_update(pos, objref)
|
|
Standard on_display_update entity callback.
|
|
|
|
**pos**: Node position
|
|
|
|
**objref**: Object reference of entity
|
|
|
|
Node should have a corresponding display_entity with size, resolution and maxlines fields and optionally halign, valign and color fields.
|
|
|
|
### Font definition table
|
|
Font definition table used by **font_api.register_font** and **font\_api.Font:new** may/can contain following elements:
|
|
|
|
* **height** (required): Font height in pixels (all font textures should have the same height) .
|
|
* **widths** (required): Array of character widths in pixels, indexed by UTF codepoints.
|
|
* **margintop** (optional): Margin (in texture pixels) added on top of each char texture.
|
|
* **marginbottom** (optional): Margin (in texture pixels) added at bottom of each char texture.
|
|
* **linespacing** (optional): Spacing (in texture pixels) between each lines.
|
|
|
|
**margintop**, **marginbottom** and **linespacing** can be negative numbers (default 0) and are to be used to adjust various font styles to each other.
|
|
|
|
Font must have a char 0 which will be used to display any unknown char.
|
|
|
|
All textures corresponding to the indexes in widths array should be present in textures directory with a name matching the pattern :
|
|
|
|
> font\_**{font_name}**_**{utf_code}**.png
|
|
|
|
**{font\_name}**: Name of the font as given in the first argument
|
|
|
|
**{utf\_code}**: UTF code of the char in 4 hexadecimal digits
|
|
|
|
Example : font_courrier_0041.png is for the "A" char in the "courrier" font.
|
|
|
|
To ease that declaration (specially to build the **widths** array), a shell is provided to build a {font\_name}.lua file from the texture files (see provided tools).
|
|
|
|
## Provided tools
|
|
|
|
Still in early stage of development, these tools are helpers to create font mods.
|
|
|
|
### make_font_texture.sh
|
|
|
|
This scripts takes a .ttf file as input and create one .png file per char, that can be used as font texture. Launch it from your future font mod directory.
|
|
|
|
__Advice__
|
|
|
|
This script works much better with pixels font, providing the correct height. There is no antialiasing at all, vector fonts and bad heights gives very ugly results.
|
|
|
|
__Syntax__
|
|
|
|
**make\_font\_texture.sh {fontfile} {fontname} {fontsize}**
|
|
|
|
**{fontfile}**: A TTF font file to use to create textures.
|
|
**{fontname}**: The font name to be used in font_api (should be simple, with no spaces).
|
|
**{fontsize}**: Font height to be rendered.
|
|
|
|
### make_font_lua.sh
|
|
|
|
This script analyses textures in textures directory and creates a font\_{font\_name}.lua files with a call to register_font with images information. Launch it from your future font mod directory.
|
|
|
|
Once the font\_{font\_name}.lua created, it can be included by a init.lua file or directly renamed to init.lua if you are creating a simple font mod.
|
|
|
|
__Syntax__
|
|
|
|
**make\_font_lua.sh {fontname}**
|
|
|
|
**{fontname}**: The font name to be used in font_api (same as given to make\_font\_texture.sh)
|
|
|
|
### An exemple generating a font mod
|
|
|
|
mkdir font_myfont
|
|
cd font_myfont
|
|
/<path_to_font_api>/tools/make_font_texture.sh myfont.ttf myfont 12
|
|
/<path_to_font_api>/tools/make_font_lua.sh myfont
|
|
mv font_myfont.lua init.lua
|
|
|
|
## Font class
|
|
A font usable with font API. This class is supposed to be for internal use but who knows.
|
|
|
|
### font\_api.Font:new(def)
|
|
Create a new font object.
|
|
|
|
**def** is a table containing font definition. See **Font definition table** above.
|
|
|
|
### font:get_char_width(char)
|
|
Returns the width of char **char** in texture pixels.
|
|
|
|
**char**: Unicode codepoint of char.
|
|
|
|
### font:get_height(nb_of_lines)
|
|
Returns line(s) height. Takes care of top and bottom margins and line spacing.
|
|
|
|
**nb_of_lines**: Number of lines in the text.
|
|
|
|
### font:get_width(line)
|
|
|
|
Returns the width of a text line. Beware, if line contains any new line char, they are ignored.
|
|
|
|
**line**: Line of text which the width will be computed.
|
|
|
|
### font:make_line_texture(line, texturew, x, y)
|
|
Create a texture for a text line.
|
|
|
|
**line**: Line of text to be rendered in texture.
|
|
|
|
**texturew**: Width of the texture (extra text is not rendered).
|
|
|
|
**x**: Starting x position in texture.
|
|
|
|
**y**: Vertical position of the line in texture.
|
|
|
|
### font:make_text_texture(text, texturew, textureh, maxlines, halign, valign, color)
|
|
Builds texture for a multiline colored text.
|
|
|
|
**text**: Text to be rendered.
|
|
|
|
**texturew**: Width of the texture (extra text will be truncated).
|
|
|
|
**textureh**: Height of the texture.
|
|
|
|
**maxlines**: Maximum number of lines.
|
|
|
|
**halign**: Horizontal text align ("left"/"center"/"right") (optional).
|
|
|
|
**valign**: Vertical text align ("top"/"center"/"bottom") (optional).
|
|
|
|
**color**: Color of the text (optional).
|
|
|