light9 Changeset - f0e1dde35aec

Changeset - f0e1dde35aec

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drewp - 22 years ago 2002-07-07 08:30:56

better brakes and numerics (oscillations are still possible if the updates get
better brakes and numerics (oscillations are still possible if the updates get
slow, like when you're moving a lot of faders)

1 file changed with 15 insertions and 17 deletions:

Widgets/FlyingFader.py

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Widgets/FlyingFader.py

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@@ @@ -6,16 +6,14 @@ class Mass: @@
     def __init__(self):
         self.x=0 # position
         self.xgoal=0 # position goal
         self.v=0 # velocity
         self.maxspeed = .8 # maximum speed, in position/second
         self.maxaccel = 3 # maximum acceleration, in position/second^2
         self.eps = .01 # epsilon - numbers within this much are considered the same
         self.eps = .03 # epsilon - numbers within this much are considered the same
         self._lastupdate=time()
         self._stopped=1
     def equal(self,a,b):
         return abs(a-b)<self.eps
@@ @@ -42,16 +40,20 @@ class Mass: @@
             self.stop()
             return
         self._stopped=0
         dir = (-1.0,1,0)[self.xgoal>self.x]
         if abs(self.xgoal-self.x) < abs(self.v*5*dt):
             # apply the brakes on the last 5 steps
             dir *= -.5
         self.v += dir*self.maxaccel*dt # velocity changes with acceleration in the right direction
         self.v = min(max(self.v,-self.maxspeed),self.maxspeed) # clamp velocity
         print "x=%+.03f v=%+.03f a=%+.03f %f" % (self.x,self.v,self.maxaccel,self.xgoal)
+        #print "x=%+.03f v=%+.03f a=%+.03f %f" % (self.x,self.v,self.maxaccel,self.xgoal)
     def goto(self,newx):
         self.xgoal=newx
     def ismoving(self):
         return not self._stopped
@@ @@ -105,33 +107,37 @@ class FlyingFader(Frame): @@
     def ismoving(self):
         return self.fadevel!=0 or self.fadeacc!=0
     def newfade(self, newlevel, evt=None, length=None):
         # these are currently unused-- Mass needs to accept a speed input
         mult = 1
         if evt.state & 8 and evt.state & 4: mult = 0.25 # both
         elif evt.state & 8: mult = 0.5 # alt
         elif evt.state & 4: mult = 2   # control
         self.mass.x = self.variable.get()
         self.mass.goto(newlevel)
         self.scale['troughcolor'] = 'red'
         self.gofade()
     def gofade(self):
         self.mass.update()
         self.variable.set(self.mass.x)
         if not self.mass.ismoving():
             self.scale['troughcolor'] = self.oldtrough
             return
         # blink the trough while the thing's moving
         if time()%.4>.2:
             self.scale.config(troughcolor=self.oldtrough)
         else:
             self.scale.config(troughcolor='white')
 #        colorfade(self.scale, percent)
         self.after(30, self.gofade)
     def updatelabel(self, *args):
         self.vlabel['text'] = "%.3f" % self.variable.get()
@@ @@ -153,22 +159,14 @@ def colorfade(scale, lev): @@
     low = (255, 255, 255)
     high = (0, 0, 0)
     out = [int(l+lev*(h-l)) for h, l in zip(high,low)]
     col="#%02X%02X%02X" % tuple(out)
     scale.config(troughcolor=col)
 if __name__ == '__main__':
 #    m=Mass()
 #    m.goto(3)
 #    while 1:
 #        m.update()
 #        print "%.03f %.03f" % (m.x, m.v)
 #        sleep(.02)
     root = Tk()
     root.tk_focusFollowsMouse()
     FlyingFader(root, variable=DoubleVar(), label="suck").pack(side=LEFT,
         expand=1, fill=BOTH)
     FlyingFader(root, variable=DoubleVar(), label="moof").pack(side=LEFT,

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