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Fixed width fonts specific management
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Pierre-Yves Rollo
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126
font_api/API.md
126
font_api/API.md
@ -7,35 +7,84 @@ Name of the font to be used when no font is given. The font should be registered
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If no default\_font given or if default\_font given but not registered, the first registered font will be used as default.
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## Provided methods
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## Use font_api with display_api (to display text on nodes)
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### Base setup
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Font_api offers a direct integration with display_api to display text on nodes.
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First of all, create a display node with an entity.
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To do this, refer to API.md in display_api mod, in particular "Howto register a display node".
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The only requirement then is to connect the `on_display_update` callback of the display entity to `font_api.on_display_update`:
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```
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minetest.register_node("mymod:test_text_node", {
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...
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paramtype2 = "facedir",
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...
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groups = { display_api = 1, ... },
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...
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display_entities = {
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["mymod:text"] = {
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depth = -0.5 - display_api.entity_spacing,
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on_display_update = font_api.on_display_update },
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}
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...
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on_place = display_api.on_place,
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on_construct = display_api.on_construct,
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on_destruct = display_api.on_destruct,
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on_rotate = display_api.on_rotate,
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...
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})
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```
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At this step, your node already displays text form "display_text" (hardcoded) node meta.
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But it uses defaults (default font, default size, default color). Likely you need something more.
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### Style your text
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Font style and size can be chosen by adding some more entries to the display_entities definition table.
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#### Font size
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Font size can be defined in various ways (maybe more in the future).
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Start with a number of lines, and font_api will make it fit to the entity size.
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* `maxlines` or `lines`: Number of maximum lines of text to be displayed. The font height will be adjusted accordingly.
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Then specify the char width. Two methods available:
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* `aspect_ratio`: Defines the aspect ratio of chars. Works with all fonts. Should not be used if `columns` is specified.
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* `columns`: Only if using a fixed width font, specifies the number of columns to display.
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#### Font style
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* `font_name`: name of the font to use. Should correspond to a registered font (from a font mod). If not specified or font not found, default font is used.
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* `color`: color to be used (default black).
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* `halign`: Horizontal alignment: "left", "center" or "right" (default "center").
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* `valign`: Vertical alignement: "top", "middle" or "bottom" (default "middle").
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## Provided methods
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### font_api.get_default_font_name()
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Returns de default font name.
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### font_api.register_font(font_name, font_def)
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Register a new font.
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**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...).
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**font_def**: Font definition table (see **Font definition table** below).
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* `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...).
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* `font_def`: Font definition table (see **Font definition table** below).
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### font_api.on_display_update(pos, objref)
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Standard on_display_update entity callback.
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**pos**: Node position
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**objref**: Object reference of entity
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* `pos`: Node position
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* `objref`: Object reference of entity
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Node should have a corresponding display_entity with size, resolution and maxlines fields and optionally halign, valign and color fields.
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### Font definition table
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Font definition table used by **font_api.register_font** and **font\_api.Font:new** may/can contain following elements:
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* **height** (required): Font height in pixels (all font textures should have the same height) .
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* **widths** (required): Array of character widths in pixels, indexed by UTF codepoints.
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* **margintop** (optional): Margin (in texture pixels) added on top of each char texture.
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* **marginbottom** (optional): Margin (in texture pixels) added at bottom of each char texture.
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* **linespacing** (optional): Spacing (in texture pixels) between each lines.
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* `height` (required): Font height in pixels (all font textures should have the same height) .
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* `widths` (required): Array of character widths in pixels, indexed by UTF codepoints.
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* `margintop` (optional): Margin (in texture pixels) added on top of each char texture.
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* `marginbottom` (optional): Margin (in texture pixels) added at bottom of each char texture.
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* `linespacing` (optional): Spacing (in texture pixels) between each lines.
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**margintop**, **marginbottom** and **linespacing** can be negative numbers (default 0) and are to be used to adjust various font styles to each other.
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`margintop`, `marginbottom` and `linespacing` can be negative numbers (default 0) and are to be used to adjust various font styles to each other.
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Font must have a char 0 which will be used to display any unknown char.
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@ -96,50 +145,33 @@ A font usable with font API. This class is supposed to be for internal use but w
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### font\_api.Font:new(def)
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Create a new font object.
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* `def` is a table containing font definition. See **Font definition table** above.
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**def** is a table containing font definition. See **Font definition table** above.
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### font:get_char_width(char)
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Returns the width of char **char** in texture pixels.
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**char**: Unicode codepoint of char.
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### font:get_char_width(codepoint)
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Returns the width of char `codepoint` in texture pixels.
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* `codepoint`: Unicode codepoint of char.
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### font:get_height(nb_of_lines)
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Returns line(s) height. Takes care of top and bottom margins and line spacing.
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**nb_of_lines**: Number of lines in the text.
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* `nb_of_lines`: Number of lines in the text.
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### font:get_width(line)
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Returns the width of a text line. Beware, if line contains any new line char, they are ignored.
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**line**: Line of text which the width will be computed.
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* `line`: Line of text which the width will be computed.
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### font:make_line_texture(line, texturew, x, y)
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Create a texture for a text line.
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**line**: Line of text to be rendered in texture.
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**texturew**: Width of the texture (extra text is not rendered).
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**x**: Starting x position in texture.
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**y**: Vertical position of the line in texture.
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* `line`: Line of text to be rendered in texture.
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* `texturew`: Width of the texture (extra text is not rendered).
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* `x`: Starting x position in texture.
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* `y`: Vertical position of the line in texture.
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### font:make_text_texture(text, texturew, textureh, maxlines, halign, valign, color)
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Builds texture for a multiline colored text.
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**text**: Text to be rendered.
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**texturew**: Width of the texture (extra text will be truncated).
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**textureh**: Height of the texture.
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**maxlines**: Maximum number of lines.
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**halign**: Horizontal text align ("left"/"center"/"right") (optional).
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**valign**: Vertical text align ("top"/"center"/"bottom") (optional).
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**color**: Color of the text (optional).
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* `text`: Text to be rendered.
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* `texturew`: Width of the texture (extra text will be truncated).
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* `textureh`: Height of the texture.
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* `maxlines`: Maximum number of lines.
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* `halign`: Horizontal text align ("left"/"center"/"right") (optional).
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* `valign`: Vertical text align ("top"/"center"/"bottom") (optional).
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* `color`: Color of the text (optional).
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@ -103,6 +103,16 @@ function Font:new(def)
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local font = table.copy(def)
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setmetatable(font, self)
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self.__index = self
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-- Check if fixedwidth
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for codepoint, width in pairs(font.widths) do
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font.fixedwidth = font.fixedwidth or width
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if width ~= font.fixedwidth then
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font.fixedwidth = nil
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break
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end
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end
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return font
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end
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@ -138,11 +148,11 @@ end
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--- Returns the width of a given char
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-- @param char : codepoint of the char
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-- @return Char width
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function Font:get_char_width(char)
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-- Replace chars with no texture by the NULL(0) char
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if self.widths[char] ~= nil then
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return self.widths[char]
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function Font:get_char_width(codepoint)
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if self.fixedwidth then
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return self.fixedwidth
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elseif self.widths[codepoint] then
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return self.widths[codepoint]
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else
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return self.widths[0]
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end
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@ -201,12 +211,12 @@ function Font:make_line_texture(line, texturew, x, y)
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codepoint, line = self:get_next_char(line)
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-- Add image only if it is visible (at least partly)
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if x + self.widths[codepoint] >= 0 and x <= texturew then
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if x + self:get_char_width(codepoint) >= 0 and x <= texturew then
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texture = texture..
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string.format(":%d,%d=font_%s_%04x.png",
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x, y, self.name, codepoint)
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end
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x = x + self.widths[codepoint]
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x = x + self:get_char_width(codepoint)
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end
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return texture
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@ -223,7 +233,7 @@ end
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-- @return Texture string
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function Font:make_text_texture(text, texturew, textureh, maxlines,
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halign, valign, color)
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halign, valign, color)
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local texture = ""
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local lines = {}
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local textheight = 0
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@ -48,13 +48,30 @@ function font_api.on_display_update(pos, objref)
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local font = font_api.get_font(meta:get_string("font") ~= ""
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and meta:get_string("font") or def.font_name)
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local maxlines = def.maxlines or 1 -- TODO:How to do w/o maxlines ?
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-- Compute entity resolution accroding to given attributes
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local texturew, textureh
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textureh = font:get_height(def.lines or def.maxlines or 1)
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if def.columns then
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if font.fixedwidth then
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texturew = def.columns * font.fixedwidth
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if def.aspect_ratio then
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minetest.log('warning', "[font_api] 'aspect_ratio' ignored because 'columns' is specified")
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end
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else
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minetest.log('warning', "[font_api] 'columns' ignored because '"..font.name.."' is not a fixed width font.")
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end
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end
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if not texturew then
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if not def.aspect_ratio then
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minetest.log('warning', "[font_api] No 'aspect_ratio' specified, using default 1.")
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end
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texturew = textureh * def.size.x / def.size.y / (def.aspect_ratio or 1)
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end
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objref:set_properties({
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textures={font:make_text_texture(text,
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font:get_height(maxlines) * def.size.x / def.size.y
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/ (def.aspect_ratio or 1),
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font:get_height(maxlines),
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textures={font:make_text_texture(text, texturew, textureh,
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def.maxlines, def.halign, def.valign, def.color)},
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visual_size = def.size
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})
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