Safe Haskell	None

Graphics.SVGFonts.ReadFont

Synopsis

Documentation

textSVG :: String -> Double -> Path R2 Source

A short version of textSVG' with standard values. The Double value is the height.

 {-# LANGUAGE NoMonomorphismRestriction #-}

import Diagrams.Prelude
import Diagrams.Backend.SVG.CmdLine
import Graphics.SVGFonts.ReadFont

main = defaultMain (textSVG "Hello World" 1)

data TextOpts Source

Constructors

TextOpts
Fields txt :: String fdo :: (FontData, OutlineMap) mode :: Mode spacing :: Spacing underline :: Bool textWidth :: Double textHeight :: Double

Instances

Default TextOpts

textSVG' :: TextOpts -> Path R2 Source

The origin is at the center of the text and the boundaries are given by the outlines of the chars.

 {-# LANGUAGE NoMonomorphismRestriction #-}

import Diagrams.Prelude
import Diagrams.Backend.SVG.CmdLine
import Graphics.SVGFonts.ReadFont

main = defaultMain (text' "Hello World")
text' t = stroke (textSVG' $ TextOpts t lin INSIDE_H KERN False 1 1 )
          # fc blue # lc blue # bg lightgrey # fillRule EvenOdd # showOrigin

textSVG_ :: forall b. Renderable (Path R2) b => TextOpts -> QDiagram b R2 Any Source

The origin is at the left end of the baseline of of the text and the boundaries are given by the bounding box of the Font. This is best for combining Text of different fonts and for several lines of text. As you can see you can also underline text by setting underline to True.

 {-# LANGUAGE NoMonomorphismRestriction #-}

import Diagrams.Prelude
import Diagrams.Backend.SVG.CmdLine
import Graphics.SVGFonts.ReadFont

main = defaultMain (text'' "Hello World")

text'' t = (textSVG_ $ TextOpts t lin INSIDE_H KERN True 1 1 )
           # fc blue # lc blue # bg lightgrey # fillRule EvenOdd # showOrigin

type FontData = (SvgGlyph, Kern, [Double], String, (Double, Double), (Double, String, String, String, String, String, String, String, String, String, String, String, String))Source

This type contains everything that a typical SVG font file produced by fontforge contains.

(SvgGlyph, Kern, bbox-string, filename, (underlinePos, underlineThickness), (fontHadv, fontFamily, fontWeight, fontStretch, unitsPerEm, panose, ascent, descent, xHeight, capHeight, stemh, stemv, unicodeRange) )

openFont :: FilePath -> FontData Source

Open an SVG-Font File and extract the data

type SvgGlyph Source

Arguments

= Map String (String, Double, String)

[ (unicode, (glyph_name, horiz_advance, ds)) ]

horizontalAdvances :: [String] -> FontData -> Bool -> [Double]Source

Horizontal advances of characters inside a string. A character is stored with a string (because of ligatures like "ffi").

hadv :: String -> FontData -> Double Source

Horizontal advance of a character consisting of its width and spacing, extracted out of the font data

type Kern Source

Arguments

= (Map String [Int], Map String [Int], Map String [Int], Map String [Int], Vector Double)

u1s, u2s, g1s, g2s, k

See http://www.w3.org/TR/SVG/fonts.html#KernElements

Some explanation how kerning is computed:

In Linlibertine.svg, there are two groups of chars: e.g. <hkern g1="f,longs,uni1E1F,f_f" g2="parenright,bracketright,braceright" k="-37" /> This line means: If there is an f followed by parentright, reduce the horizontal advance by -37 (add 37). Therefore to quickly check if two characters need kerning assign an index to the second group (g2 or u2) and assign to every unicode in the first group (g1 or u1) this index, then sort these tuples after their name (for binary search). Because the same unicode char can appear in several g1s, reduce this multiset, ie all the ("name1",0) ("name1",1) to ("name1",[0,1]). Now the g2s are converted in the same way as the g1s. Whenever two consecutive chars are being printed try to find an intersection of the list assigned to the first char and second char

kernAdvance :: String -> String -> Kern -> Bool -> Double Source

Change the horizontal advance of two consective chars (kerning)

type OutlineMap = Map String (Path R2)Source

data Mode Source

Constructors

INSIDE_H

The string fills the complete height, width adjusted. Used in text editors. The result can be smaller or bigger than the bounding box:

INSIDE_W

The string fills the complete width, heigth adjusted. Maybe useful for single words in a diagram or headlines. The result can be smaller or bigger than the bounding box:

INSIDE_WH

The string is stretched inside Width and Height boundaries. The horizontal advances are increased if the string is shorter than there is space. The horizontal advances are decreased if the string is longer than there is space. This feature is experimental and might change in the future.