diff --git a/bin/tracker b/bin/tracker
--- a/bin/tracker
+++ b/bin/tracker
@@ -1,272 +1,311 @@
 #!/usr/bin/python
-from __future__ import division,nested_scopes
+from __future__ import division, nested_scopes
 
 import sys
 sys.path.append("../../editor/pour")
 sys.path.append("../light8")
 
 from Submaster import Submaster
-from skim.zooming import Zooming,Pair
-from math import sqrt,sin,cos
+from skim.zooming import Zooming, Pair
+from math import sqrt, sin, cos
 from pygame.rect import Rect
-from xmlnodebase import xmlnodeclass,collectiveelement,xmldocfile
+from xmlnodebase import xmlnodeclass, collectiveelement, xmldocfile
 from dispatch import dispatcher
 
 import dmxclient
 
 import Tkinter as tk
 
-defaultfont="arial 8"
+defaultfont = "arial 8"
 
-def pairdist(pair1,pair2):
+
+def pairdist(pair1, pair2):
     return pair1.dist(pair2)
 
-def canvashighlighter(canvas,obj,attribute,normalval,highlightval):
+
+def canvashighlighter(canvas, obj, attribute, normalval, highlightval):
     """creates bindings on a canvas obj that make attribute go
     from normal to highlight when the mouse is over the obj"""
-    canvas.tag_bind(obj,"<Enter>",
-                    lambda ev: canvas.itemconfig(obj,**{attribute:highlightval}))
-    canvas.tag_bind(obj,"<Leave>",
-                    lambda ev: canvas.itemconfig(obj,**{attribute:normalval}))
+    canvas.tag_bind(
+        obj, "<Enter>", lambda ev: canvas.itemconfig(
+            obj, **{attribute: highlightval}))
+    canvas.tag_bind(
+        obj,
+        "<Leave>", lambda ev: canvas.itemconfig(obj, **{attribute: normalval}))
+
 
 class Field(xmlnodeclass):
-    
     """one light has a field of influence. for any point on the
     canvas, you can ask this field how strong it is. """
 
-    def name(self,newval=None):
+    def name(self, newval=None):
         """light/sub name"""
-        return self._getorsetattr("name",newval)
-    def center(self,x=None,y=None):
+        return self._getorsetattr("name", newval)
+
+    def center(self, x=None, y=None):
         """x,y float coords for the center of this light in the field. returns
         a Pair, although it accepts x,y"""
-        return Pair(self._getorsettypedattr("x",float,x),
-                    self._getorsettypedattr("y",float,y))
+        return Pair(self._getorsettypedattr("x", float, x),
+                    self._getorsettypedattr("y", float, y))
 
-    def falloff(self,dist=None):
-        
+    def falloff(self, dist=None):
         """linear falloff from 1 at center, to 0 at dist pixels away
         from center"""
-        return self._getorsettypedattr("falloff",float,dist)
+        return self._getorsettypedattr("falloff", float, dist)
 
-    def getdistforintensity(self,intens):
+    def getdistforintensity(self, intens):
         """returns the distance you'd have to be for the given intensity (0..1)"""
-        return (1-intens)*self.falloff()
+        return (1 - intens) * self.falloff()
 
-    def calc(self,x,y):
+    def calc(self, x, y):
         """returns field strength at point x,y"""
-        dist=pairdist(Pair(x,y),self.center())
-        return max(0,(self.falloff()-dist)/self.falloff())
+        dist = pairdist(Pair(x, y), self.center())
+        return max(0, (self.falloff() - dist) / self.falloff())
+
 
 class Fieldset(collectiveelement):
     """group of fields. persistent."""
-    def childtype(self): return Field
+
+    def childtype(self):
+        return Field
 
     def version(self):
         """read-only version attribute on fieldset tag"""
-        return self._getorsetattr("version",None)
+        return self._getorsetattr("version", None)
 
-    def report(self,x,y):
+    def report(self, x, y):
         """reports active fields and their intensities"""
-        active=0
+        active = 0
         for f in self.getall():
-            name=f.name()
-            intens=f.calc(x,y)
-            if intens>0:
-                print name,intens,
-                active+=1
-        if active>0:
+            name = f.name()
+            intens = f.calc(x, y)
+            if intens > 0:
+                print name, intens,
+                active += 1
+        if active > 0:
             print
-        self.dmxsend(x,y)
-    def dmxsend(self,x,y):
+        self.dmxsend(x, y)
+
+    def dmxsend(self, x, y):
         """output lights to dmx"""
-        levels=dict([(f.name(),f.calc(x,y)) for f in self.getall()])
-        dmxlist=Submaster(None,levels).get_dmx_list()
+        levels = dict([(f.name(), f.calc(x, y)) for f in self.getall()])
+        dmxlist = Submaster(None, levels).get_dmx_list()
         dmxclient.outputlevels(dmxlist)
-        
-        
+
     def getbounds(self):
         """returns xmin,xmax,ymin,ymax for the non-zero areas of this field"""
-        r=None
+        r = None
         for f in self.getall():
-            rad=f.getdistforintensity(0)
-            fx,fy=f.center()
-            fieldrect=Rect(fx-rad,fy-rad,rad*2,rad*2)
+            rad = f.getdistforintensity(0)
+            fx, fy = f.center()
+            fieldrect = Rect(fx - rad, fy - rad, rad * 2, rad * 2)
             if r is None:
-                r=fieldrect
+                r = fieldrect
             else:
-                r=r.union(fieldrect)
-        return r.left,r.right,r.top,r.bottom
+                r = r.union(fieldrect)
+        return r.left, r.right, r.top, r.bottom
+
 
 class Fieldsetfile(xmldocfile):
-    def __init__(self,filename):
-        self._openornew(filename,topleveltype=Fieldset)
+
+    def __init__(self, filename):
+        self._openornew(filename, topleveltype=Fieldset)
+
     def fieldset(self):
         return self._gettoplevel()
 
+
 ########################################################################
 ########################################################################
 
+
 class FieldDisplay:
     """the view for a Field."""
-    def __init__(self,canvas,field):
-        self.canvas=canvas
-        self.field=field
-        self.tags=[str(id(self))] # canvas tag to id our objects
-        
+
+    def __init__(self, canvas, field):
+        self.canvas = canvas
+        self.field = field
+        self.tags = [str(id(self))]  # canvas tag to id our objects
+
     def setcoords(self):
         """adjust canvas obj coords to match the field"""
         # this uses the canvas object ids saved by makeobjs
-        f=self.field
-        c=self.canvas
-        w2c=self.canvas.world2canvas
+        f = self.field
+        c = self.canvas
+        w2c = self.canvas.world2canvas
 
         # rings
-        for intens,ring in self.rings.items():
-            rad=f.getdistforintensity(intens)
-            p1=w2c(*(f.center()-Pair(rad,rad)))
-            p2=w2c(*(f.center()+Pair(rad,rad)))
-            c.coords(ring,p1[0],p1[1],p2[0],p2[1])
+        for intens, ring in self.rings.items():
+            rad = f.getdistforintensity(intens)
+            p1 = w2c(*(f.center() - Pair(rad, rad)))
+            p2 = w2c(*(f.center() + Pair(rad, rad)))
+            c.coords(ring, p1[0], p1[1], p2[0], p2[1])
 
         # text
-        p1=w2c(*f.center())
-        c.coords(self.txt,*p1)
+        p1 = w2c(*f.center())
+        c.coords(self.txt, *p1)
 
     def makeobjs(self):
         """(re)create the canvas objs (null coords) and make their bindings"""
-        c=self.canvas
-        f=self.field
+        c = self.canvas
+        f = self.field
         c.delete(self.tags)
 
-        w2c=self.canvas.world2canvas
+        w2c = self.canvas.world2canvas
 
         # make rings
-        self.rings={} # rad,canvasobj
-        for intens,color in (#(1,'white'),
-                             (.8,'gray90'),(.6,'gray80'),(.4,'gray60'),(.2,'gray50'),
-                             (0,'#000080')):
-            self.rings[intens]=c.create_oval(0,0,0,0,
-                                          outline=color,width=2,tags=self.tags,
-                                          outlinestipple='gray50')
+        self.rings = {}  # rad,canvasobj
+        for intens, color in (  #(1,'white'),
+            (.8, 'gray90'), (.6, 'gray80'), (.4, 'gray60'), (.2, 'gray50'),
+            (0, '#000080')):
+            self.rings[intens] = c.create_oval(0,
+                                               0,
+                                               0,
+                                               0,
+                                               outline=color,
+                                               width=2,
+                                               tags=self.tags,
+                                               outlinestipple='gray50')
 
         # make text
-        self.txt=c.create_text(0,0,text=f.name(),font=defaultfont+" bold",
-                               fill='white',anchor='c',
-                               tags=self.tags)
+        self.txt = c.create_text(0,
+                                 0,
+                                 text=f.name(),
+                                 font=defaultfont + " bold",
+                                 fill='white',
+                                 anchor='c',
+                                 tags=self.tags)
 
         # highlight text bindings
-        canvashighlighter(c,self.txt,'fill',normalval='white',highlightval='red')
+        canvashighlighter(c,
+                          self.txt,
+                          'fill',
+                          normalval='white',
+                          highlightval='red')
 
         # position drag bindings
         def press(ev):
-            self._lastmouse=ev.x,ev.y
+            self._lastmouse = ev.x, ev.y
+
         def motion(ev):
-            dcan=Pair(*[a-b for a,b in zip((ev.x,ev.y),self._lastmouse)])
-            dworld=c.canvas2world_vector(*dcan)
-            self.field.center(*(self.field.center()+dworld))
-            self._lastmouse=ev.x,ev.y
-            self.setcoords() # redraw
+            dcan = Pair(*[a - b for a, b in zip((ev.x, ev.y), self._lastmouse)])
+            dworld = c.canvas2world_vector(*dcan)
+            self.field.center(*(self.field.center() + dworld))
+            self._lastmouse = ev.x, ev.y
+            self.setcoords()  # redraw
+
         def release(ev):
-            if hasattr(self,'_lastmouse'):
+            if hasattr(self, '_lastmouse'):
                 del self._lastmouse
-            dispatcher.send("field coord changed") # updates bounds
-            
-        c.tag_bind(self.txt,"<ButtonPress-1>",press)
-        c.tag_bind(self.txt,"<B1-Motion>",motion)
-        c.tag_bind(self.txt,"<B1-ButtonRelease>",release)
+            dispatcher.send("field coord changed")  # updates bounds
+
+        c.tag_bind(self.txt, "<ButtonPress-1>", press)
+        c.tag_bind(self.txt, "<B1-Motion>", motion)
+        c.tag_bind(self.txt, "<B1-ButtonRelease>", release)
 
         # radius drag bindings
-        outerring=self.rings[0]
-        canvashighlighter(c,outerring,
-                          'outline',normalval='#000080',highlightval='#4040ff')
+        outerring = self.rings[0]
+        canvashighlighter(c,
+                          outerring,
+                          'outline',
+                          normalval='#000080',
+                          highlightval='#4040ff')
+
         def motion(ev):
-            worldmouse=self.canvas.canvas2world(ev.x,ev.y)
-            currentdist=pairdist(worldmouse,self.field.center())
+            worldmouse = self.canvas.canvas2world(ev.x, ev.y)
+            currentdist = pairdist(worldmouse, self.field.center())
             self.field.falloff(currentdist)
             self.setcoords()
-        c.tag_bind(outerring,"<B1-Motion>",motion)
-        c.tag_bind(outerring,"<B1-ButtonRelease>",release) # from above
+
+        c.tag_bind(outerring, "<B1-Motion>", motion)
+        c.tag_bind(outerring, "<B1-ButtonRelease>", release)  # from above
 
         self.setcoords()
-    
+
+
 class Tracker(tk.Frame):
-
     """whole tracker widget, which is mostly a view for a
     Fieldset. tracker makes its own fieldset"""
 
     # world coords of the visible canvas (preserved even in window resizes)
-    xmin=0
-    xmax=100
-    ymin=0
-    ymax=100
+    xmin = 0
+    xmax = 100
+    ymin = 0
+    ymax = 100
+
+    fieldsetfile = None
+    displays = None  # Field : FieldDisplay. we keep these in sync with the fieldset
 
-    fieldsetfile=None
-    displays=None # Field : FieldDisplay. we keep these in sync with the fieldset
-    
-    def __init__(self,master):
-        tk.Frame.__init__(self,master)
+    def __init__(self, master):
+        tk.Frame.__init__(self, master)
 
-        self.displays={}
-        
-        c=self.canvas=Zooming(self,bg='black',closeenough=5)
-        c.pack(fill='both',exp=1)
+        self.displays = {}
+
+        c = self.canvas = Zooming(self, bg='black', closeenough=5)
+        c.pack(fill='both', exp=1)
 
         # preserve edge coords over window resize
-        c.bind("<Configure>",self.configcoords)
-        
-        c.bind("<Motion>",
-               lambda ev: self._fieldset().report(*c.canvas2world(ev.x,ev.y)))
+        c.bind("<Configure>", self.configcoords)
+
+        c.bind("<Motion>", lambda ev: self._fieldset().report(*c.canvas2world(
+            ev.x, ev.y)))
+
         def save(ev):
             print "saving"
             self.fieldsetfile.save()
-        master.bind("<Key-s>",save)
-        dispatcher.connect(self.autobounds,"field coord changed")
+
+        master.bind("<Key-s>", save)
+        dispatcher.connect(self.autobounds, "field coord changed")
 
     def _fieldset(self):
         return self.fieldsetfile.fieldset()
 
-    def load(self,filename):
-        self.fieldsetfile=Fieldsetfile(filename)
+    def load(self, filename):
+        self.fieldsetfile = Fieldsetfile(filename)
         self.displays.clear()
         for f in self.fieldsetfile.fieldset().getall():
-            self.displays[f]=FieldDisplay(self.canvas,f)
+            self.displays[f] = FieldDisplay(self.canvas, f)
             self.displays[f].makeobjs()
         self.autobounds()
 
-    def configcoords(self,*args):
+    def configcoords(self, *args):
         # force our canvas coords to stay at the edges of the window
-        c=self.canvas
-        cornerx,cornery=c.canvas2world(0,0)
-        c.move(cornerx-self.xmin,
-               cornery-self.ymin)
-        c.setscale(0,0,
-                   c.winfo_width()/(self.xmax-self.xmin),
-                   c.winfo_height()/(self.ymax-self.ymin))
+        c = self.canvas
+        cornerx, cornery = c.canvas2world(0, 0)
+        c.move(cornerx - self.xmin, cornery - self.ymin)
+        c.setscale(0, 0,
+                   c.winfo_width() / (self.xmax - self.xmin),
+                   c.winfo_height() / (self.ymax - self.ymin))
 
     def autobounds(self):
         """figure out our bounds from the fieldset, and adjust the display zooms.
         writes the corner coords onto the canvas."""
-        self.xmin,self.xmax,self.ymin,self.ymax=self._fieldset().getbounds()
+        self.xmin, self.xmax, self.ymin, self.ymax = self._fieldset().getbounds(
+        )
 
         self.configcoords()
-        
-        c=self.canvas
+
+        c = self.canvas
         c.delete('cornercoords')
-        for x,anc2 in ((self.xmin,'w'),(self.xmax,'e')):
-            for y,anc1 in ((self.ymin,'n'),(self.ymax,'s')):
-                pos=c.world2canvas(x,y)
-                c.create_text(pos[0],pos[1],text="%s,%s"%(x,y),
-                              fill='white',anchor=anc1+anc2,
+        for x, anc2 in ((self.xmin, 'w'), (self.xmax, 'e')):
+            for y, anc1 in ((self.ymin, 'n'), (self.ymax, 's')):
+                pos = c.world2canvas(x, y)
+                c.create_text(pos[0],
+                              pos[1],
+                              text="%s,%s" % (x, y),
+                              fill='white',
+                              anchor=anc1 + anc2,
                               tags='cornercoords')
         [d.setcoords() for d in self.displays.values()]
 
+
 ########################################################################
 ########################################################################
-                
-root=tk.Tk()
+
+root = tk.Tk()
 root.wm_geometry('700x350')
-tra=Tracker(root)
-tra.pack(fill='both',exp=1)
+tra = Tracker(root)
+tra.pack(fill='both', exp=1)
 
 tra.load("fieldsets/demo")