Pdf.Toolbox.Content.Processor

Process content stream operators maintaining graphics state

It is pretty experimental

Documentation

data Processor

Processor maintains graphics state

Constructors

Processor

Fields

prState :: GraphicsState

prStateStack :: [GraphicsState]

prGlyphDecoder :: GlyphDecoder

prGlyphs :: [[Glyph]]

Each element is a list of glyphs, drawn in one shot

data GraphicsState

Graphics state

Constructors

GraphicsState

Fields

gsInText :: Bool

Indicates that we are inside text object

gsCurrentTransformMatrix :: Transform Double

gsFont :: Maybe Name

gsFontSize :: Maybe Double

gsTextMatrix :: Transform Double

Defined only inside text object

gsTextLineMatrix :: Transform Double

Defined only inside text object

gsTextLeading :: Double

gsTextCharSpacing :: Double

gsTextWordSpacing :: Double

Instances

Show GraphicsState

type GlyphDecoder = Name -> Str -> [(Glyph, Double)]

Given font name and string, it should return list of glyphs and their widths.

Note: it should not try to position or scale glyphs to user space, bounding boxes should be defined in glyph space.

Note: glyph width is a distance between the glyph's origin and the next glyph's origin, so it generally can't be calculated from bounding box

Note: the Processor actually doesn't cares about glyph's bounding box, so you can return anything you want

data Glyph

Glyph

Constructors

Glyph

Fields

glyphCode :: Int

The code as read from content stream

glyphTopLeft :: Vector Double

Top-left corner of glyph's bounding box

glyphBottomRight :: Vector Double

Bottom-right corner of glyph's bounding box

glyphText :: Maybe Text

Text ectracted from the glyph

Instances

Show Glyph

initialGraphicsState :: GraphicsState

Empty graphics state

mkProcessor :: Processor

Create processor in initial state

processOp :: Monad m => Operator -> Processor -> PdfE m Processor

Process one operation