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-rw-r--r--olpcgames/svgsprite.py69
1 files changed, 69 insertions, 0 deletions
diff --git a/olpcgames/svgsprite.py b/olpcgames/svgsprite.py
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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
+