docs: 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