svgitem.py

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from gi.repository import GObject, GooCanvas
import rsvg
#import cairo
import os.path
 
 
 
class SvgItem(GooCanvas.ItemSimple):
    
    __gproperties__ = {
        'x': (float,                                # property type
              'X',                                  # property nick name
              'The x coordinate of a SVG image',    # property description
              -10e6,                                    # property minimum value
              10e6,                                 # property maximum value
              0,                                    # property default value
              GObject.PARAM_READWRITE),             # property flags
 
        'y': (float,
              'Y',
              'The y coordinate of a SVG image',
              -10e6,
              10e6,
              0,
              GObject.PARAM_READWRITE),
 
        'width': (float,
                  'Width',
                  'The width of the SVG Image',
                  0,
                  10e6,
                  0,
                  GObject.PARAM_READWRITE),
 
        'height': (float,
                   'Height',
                   'The width of the SVG Image',
                   0,
                   10e6,
                   0,
                   GObject.PARAM_READWRITE),
        }
 
    def __init__(self, x, y, rsvg_handle, **kwargs):
        """
        Initializer
        @param self this object
        """
        super(SvgItem, self).__init__(**kwargs)
        assert isinstance(rsvg_handle, rsvg.Handle)
        self.xx = x
        self.yy = y
        self.sxsx = 1.0
        self.sysy = 1.0
        self.handlehandle = rsvg_handle
        self.widthwidth = self.handlehandle.props.width
        self.heightheight = self.handlehandle.props.height
        self.custom_widthcustom_width = None
        self.custom_heightcustom_height = None
 
    def do_set_property(self, pspec, value):
        """!
        Set Property
        @param self this object
        @param pspec property name
        @param value property value
        @return exception if unknown property
        """
        if pspec.name == 'x':
            self.xx = value
 
            # make sure we update the display
            self.changed(True)
 
        elif pspec.name == 'y':
            self.yy = value
 
            # make sure we update the display
            self.changed(True)
 
        elif pspec.name == 'width':
            self.custom_widthcustom_width = value
            self._size_changed_size_changed()
 
            # make sure we update the display
            self.changed(True)
 
        elif pspec.name == 'height':
            self.custom_heightcustom_height = value
            self._size_changed_size_changed()
 
            # make sure we update the display
            self.changed(True)
 
        else:
            raise AttributeError('unknown property %s' % pspec.name)
 
    def _size_changed(self):
        """!
        Size Changed function
        @param self this object
        @return exception if unknown property
        """
        if self.custom_widthcustom_width is None and self.custom_heightcustom_height is None:
            self.widthwidth = self.handlehandle.props.width
            self.heightheight = self.handlehandle.props.height
            self.sxsx = 1.0
            self.sysy = 1.0
        elif self.custom_widthcustom_width is not None and self.custom_heightcustom_height is None:
            self.widthwidth = self.custom_widthcustom_width
            self.sxsx = self.custom_widthcustom_width / self.handlehandle.props.width
            self.sysy = self.sxsx
            self.heightheight = self.handlehandle.props.height*self.sysy
        elif self.custom_widthcustom_width is None and self.custom_heightcustom_height is not None:
            self.heightheight = self.custom_heightcustom_height
            self.sysy = self.custom_heightcustom_height / self.handlehandle.props.height
            self.sxsx  = self.sysy
            self.widthwidth = self.handlehandle.props.width*self.sxsx
        else:
            self.widthwidth = self.custom_widthcustom_width
            self.heightheight = self.custom_heightcustom_height
            self.sxsx = self.custom_widthcustom_width / self.handlehandle.props.width
            self.sysy = self.custom_heightcustom_height / self.handlehandle.props.height
 
    def do_get_property(self, pspec):
        """!
        Get Property
        @param self this object
        @param pspec property name
        @return property value or exception if unknown property
        """
        if pspec.name == 'x':
            return self.xx
 
        elif pspec.name == 'y':
            return self.yy
 
        elif pspec.name == 'width':
            self.widthwidth = self.handlehandle.props.width
            self.heightheight = self.handlehandle.props.height
 
            return self.widthwidth
 
        elif pspec.name == 'height':
            return self.heightheight
 
        else:
            raise AttributeError('unknown property %s' % pspec.name)
 
    def do_simple_paint(self, cr, bounds):
        """!
        Simple Paint function
        @param self this object
        @param cr rendered
        @param bounds bounds
        @return none
        """
        cr.translate(self.xx, self.yy)
        cr.scale(self.sxsx, self.sysy)
        self.handlehandle.render_cairo(cr)
 
    def do_simple_update(self, cr):
        """!
        Simple Update function
        @param self this object
        @param cr rendered
        @return none
        """
        self.bounds_x1bounds_x1 = float(self.xx)
        self.bounds_y1bounds_y1 = float(self.yy)
        self.bounds_x2bounds_x2 = float(self.xx + self.widthwidth)
        self.bounds_y2bounds_y2 = float(self.yy + self.heightheight)
 
    def do_simple_is_item_at(self, x, y, cr, is_pointer_event):
        """!
        Simple Is Item At function
        @param self this object
        @param x the X position
        @param y the Y position
        @param cr rendered
        @param is_pointer_event is the event a pointer event
        @return true if at or false if not
        """
        if ((x < self.xx) or (x > self.xx + self.widthwidth)) or ((y < self.yy) or (y > self.yy + self.heightheight)):
            return False
        else:
            return True
 
 
_rsvg_cache = dict()
 
def rsvg_handle_factory(base_file_name):
    try:
        return _rsvg_cache[base_file_name]
    except KeyError:
        full_path = os.path.join(os.path.dirname(__file__), 'resource', base_file_name)
        rsvg_handle = rsvg.Handle(full_path)
        _rsvg_cache[base_file_name] = rsvg_handle
        return rsvg_handle