|The SVG extension to the Cairo 2D graphics library.
These operations render an SVG image directly in the current Render
contect. Because they operate in the cairo Render monad they are
affected by the current transformation matrix. So it is possible, for
example, to scale or rotate an SVG image.
In the following example we scale an SVG image to a unit square:
let (width, height) = svgGetSize in
do scale (1/width) (1/height)
|svgRenderFromFile :: FilePath -> Render ()|
|svgRenderFromHandle :: Handle -> Render ()|
|svgRenderFromString :: String -> Render ()|
|With this API there are seperate functions for loading the SVG and
rendering it. This allows us to be more effecient in the case that an SVG
image is used many times - since it can be loaded just once and rendered
many times. With the convenience API above the SVG would be parsed and
processed each time it is drawn.
|data SVG |
|svgRender :: SVG -> Render ()|
|-> (Int, Int)|
|Get the width and height of the SVG image.
|Block scoped versions
These versions of the SVG loading operations give temporary access
to the SVG object within the scope of the handler function. These
operations guarantee that the resources for the SVG object are deallocated
at the end of the handler block. If this form of resource allocation is
too restrictive you can use the GC-managed versions below.
These versions are ofen used in the following style:
withSvgFromFile "foo.svg" $ \svg -> do
|withSvgFromFile :: FilePath -> (SVG -> Render a) -> Render a|
|withSvgFromHandle :: Handle -> (SVG -> Render a) -> Render a|
|withSvgFromString :: String -> (SVG -> Render a) -> Render a|
|These versions of the SVG loading operations use the standard Haskell
garbage collector to manage the resources associated with the SVG object.
As such they are more convenient to use but the GC cannot give
strong guarantees about when the resources associated with the SVG object
will be released. In most circumstances this is not a problem, especially
if the SVG files being used are not very big.
|svgNewFromFile :: FilePath -> IO SVG|
|svgNewFromHandle :: Handle -> IO SVG|
|svgNewFromString :: String -> IO SVG|
|Produced by Haddock version 0.8|