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"""RSVG/Cairo-based rendering of SVG into Pygame Images"""
from pygame import sprite
from olpcgames import _cairoimage
import cairo, rsvg
class SVGSprite( sprite.Sprite ):
"""Sprite class which renders SVG source-code as a Pygame image"""
rect = image = None
resolution = None
def __init__(
self, svg=None, size=None, *args
):
"""Initialise the svg sprite
svg -- svg source text (i.e. content of an svg file)
size -- optional, to constrain size, (width,height), leaving one
as None or 0 causes proportional scaling, leaving both
as None or 0 causes natural scaling (screen resolution)
args -- if present, groups to which to automatically add
"""
self.size = size
super( SVGSprite, self ).__init__( *args )
if svg:
self.setSVG( svg )
def setSVG( self, svg ):
"""Set our SVG source"""
self.svg = svg
# XXX could delay this until actually asked to display...
if self.size:
width,height = self.size
else:
width,height = None,None
self.image = self._render( width,height )
rect = self.image.get_rect()
if self.rect:
rect.move( self.rect ) # should let something higher-level do that...
self.rect = rect
def _render( self, width, height ):
"""Render our SVG to a Pygame image"""
handle = rsvg.Handle( data = self.svg )
originalSize = (width,height)
scale = 1.0
hw,hh = handle.get_dimension_data()[:2]
if hw and hh:
if not width:
if not height:
width,height = hw,hh
else:
scale = float(height)/hh
width = hh/float(hw) * height
elif not height:
scale = float(width)/hw
height = hw/float(hh) * width
else:
# scale only, only rendering as large as it is...
if width/height > hw/hh:
# want it taller than it is...
width = hh/float(hw) * height
else:
height = hw/float(hh) * width
scale = float(height)/hh
csrf, ctx = _cairoimage.newContext( int(width), int(height) )
ctx.scale( scale, scale )
handle.render_cairo( ctx )
return _cairoimage.asImage( csrf )
return None
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