def plot_pointings(self,pointings=None):
        """Plot pointings on canavs"""

        if pointings is None:
            pointings=self.pointings

	i=0
        for pointing in pointings:
            items=[]
	    i=i+1
	    label={}
	    label['text']=pointing['label']['text']
            for ccd in pointing["camera"].getGeometry():
                (x1,y1)=self.p2c((ccd[0],ccd[1]))
                (x2,y2)=self.p2c((ccd[2],ccd[3]))
                item=self.create_rectangle(x1,y1,x2,y2,stipple='gray25',fill=pointing.get('color',''))
                items.append(item)
	    if w.show_labels.get()==1:
	        label['id']=self.label(pointing["camera"].ra,pointing["camera"].dec,label['text'])
            pointing["items"]=items
	    pointing["label"]=label