--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/light8/Xfader.py	Wed Jul 03 09:37:57 2002 +0000
@@ -0,0 +1,74 @@
+from Tix import *
+from __future__ import division
+
+class Xfader(Canvas):
+    def __init__(self, scalelevelsIn):
+        global scalelevels
+        scalelevels=scalelevelsIn
+        self.checkbuttons={}
+        self.startcoord=None
+    def sub2(self,a,b):
+        return ( (a[0]-b[0]), (a[1]-b[1]))
+    def down(self,ev):
+        global scalelevels
+        self.startcoord=(ev.x,-ev.y)
+        self.startlevels = dict([(k,v.get()) for k,v in scalelevels.items()])
+        # find the channel names of the selected subs
+        self.onchannel = {
+            'x':[x for x in scalelevels.keys() if self.checkbuttons[x]['x'].get()],
+            'y':[x for x in scalelevels.keys() if self.checkbuttons[x]['y'].get()]
+            }
+
+        
+        #self.create_line(0,0,100,100,tag='transient')
+        
+    def getoriglevel(self,subname):
+        return self.startlevels[subname]
+    def up(self,ev):
+        self.startcoord=None
+        self.delete('transient')
+        # self.clearallbuttons()
+    def moved(self,ev):
+        if self.startcoord is None:
+            return
+        pos=(ev.x,-ev.y)
+        deltas= self.sub2(pos,self.startcoord)
+        for axis,delta in zip(('x','y'),deltas):
+            onchan=self.onchannel[axis]
+            for subn in onchan:
+                newlev = self.getoriglevel(subn) + 1.0*delta/75
+                newlev = int(newlev*1000)/1000.0
+                newlev = min(1.0,max(newlev,0.0))
+                scalelevels[subn].set( newlev )
+    def width(self):
+        return int(self['width'])
+    def height(self):
+        return int(self['height'])
+    def setupwidget(self,parent):
+        Canvas.__init__(self,parent,width=150,height=150,bg="grey40")
+        self.pack(side='bottom')
+        self.create_rectangle(5,5,self.width()-5,self.height()-5)
+        self.create_line(0,self.height()/2,150,self.height()/2)
+        self.create_line(self.width()/2,0,self.width()/2,self.height())
+        self.bind("<ButtonPress-1>",self.down)
+        self.bind("<ButtonRelease-1>",self.up)
+        self.bind("<B1-Motion>",self.moved)
+
+    def registerbutton(self,subname,axis,checkvar):
+        if subname not in self.checkbuttons:
+            self.checkbuttons[subname]={}
+        self.checkbuttons[subname][axis]=checkvar
+    def clearallbuttons(self, axis='both'):
+        for cb in self.checkbuttons.values():
+            if axis == 'both':
+                for a in cb.values():
+                    a.set(0)
+            else:
+                cb[axis].set(0)
+    def grab(self,axis):
+        self.clearallbuttons(axis)
+        for n,sv in scalelevels.items():
+            if sv.get() and n != 'blacklight':
+                self.checkbuttons[n][axis].set(1)
+
+