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comparison Widgets/FlyingFader.py @ 0:45b12307c695

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Initial revision
author drewp
date Wed, 03 Jul 2002 09:37:57 +0000
parents
children 342f7d1c7561
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-1:000000000000 0:45b12307c695
1 from Tix import *
2 from time import time,sleep
3 from __future__ import division
4
5 class Mass:
6 def __init__(self):
7 self.x=0 # position
8 self.xgoal=0 # position goal
9
10 self.v=0 # velocity
11 self.maxspeed = .8 # maximum speed, in position/second
12 self.maxaccel = 3 # maximum acceleration, in position/second^2
13 self.eps = .03 # epsilon - numbers within this much are considered the same
14
15 self._lastupdate=time()
16 self._stopped=1
17
18 def equal(self,a,b):
19 return abs(a-b)<self.eps
20
21 def stop(self):
22 self.v=0
23 self.xgoal=self.x
24 self._stopped=1
25
26 def update(self):
27 t0 = self._lastupdate
28 tnow = time()
29 self._lastupdate = tnow
30
31 dt = tnow-t0
32
33 self.x += self.v*dt
34 # hitting the ends stops the slider
35 if self.x>1: self.v=max(self.v,0); self.x=1
36 if self.x<0: self.v=min(self.v,0); self.x=0
37
38 if self.equal(self.x,self.xgoal):
39 self.x=self.xgoal # clean up value
40 self.stop()
41 return
42
43 self._stopped=0
44 dir = (-1.0,1,0)[self.xgoal>self.x]
45
46 if abs(self.xgoal-self.x) < abs(self.v*5*dt):
47 # apply the brakes on the last 5 steps
48 dir *= -.5
49
50 self.v += dir*self.maxaccel*dt # velocity changes with acceleration in the right direction
51 self.v = min(max(self.v,-self.maxspeed),self.maxspeed) # clamp velocity
52
53 #print "x=%+.03f v=%+.03f a=%+.03f %f" % (self.x,self.v,self.maxaccel,self.xgoal)
54
55 def goto(self,newx):
56 self.xgoal=newx
57
58 def ismoving(self):
59 return not self._stopped
60
61 class FlyingFader(Frame):
62 def __init__(self, master, variable, label, fadedur=1.5, font=('Arial', 8), labelwidth=12,
63 **kw):
64 Frame.__init__(self, master)
65 self.name = label
66 self.variable = variable
67
68 self.mass = Mass()
69
70 self.config({'bd':1, 'relief':'raised'})
71 scaleopts = {'variable' : variable, 'showvalue' : 0, 'from' : 1.0,
72 'to' : 0, 'res' : 0.001, 'width' : 20, 'length' : 200, 'orient':'vert'}
73 scaleopts.update(kw)
74 if scaleopts['orient']=='vert':
75 side1=TOP
76 side2=BOTTOM
77 else:
78 side1=RIGHT
79 side2=LEFT
80
81 self.scale = Scale(self, **scaleopts)
82 self.vlabel = Label(self, text="0.0", width=6, font=font)
83 self.label = Label(self, text=label, font=font, anchor='w',width=labelwidth) #wraplength=40, )
84
85 self.oldtrough = self.scale['troughcolor']
86
87 self.scale.pack(side=side2, expand=1, fill=BOTH, anchor='c')
88 self.vlabel.pack(side=side2, expand=0, fill=X)
89 self.label.pack(side=side2, expand=0, fill=X)
90
91 for k in range(1, 10):
92 self.scale.bind("<Key-%d>" % k,
93 lambda evt, k=k: self.newfade(k / 10.0, evt))
94
95 self.scale.bind("<Key-0>", lambda evt: self.newfade(1.0, evt))
96 self.scale.bind("<grave>", lambda evt: self.newfade(0, evt))
97
98 self.scale.bind("<1>", self.cancelfade)
99 self.scale.bind("<2>", self.cancelfade)
100 self.scale.bind("<3>", self.mousefade)
101
102 self.trace_ret = self.variable.trace('w', self.updatelabel)
103 self.bind("<Destroy>",self.ondestroy)
104
105 def ondestroy(self,*ev):
106 self.variable.trace_vdelete('w',self.trace_ret)
107
108 def cancelfade(self, evt):
109 self.fadegoal = self.variable.get()
110 self.fadevel = self.fadeacc = 0
111
112 self.scale['troughcolor'] = self.oldtrough
113
114 def mousefade(self, evt):
115 target = float(self.tk.call(self.scale, 'get', evt.x, evt.y))
116 self.newfade(target, evt)
117
118 def ismoving(self):
119 return self.fadevel!=0 or self.fadeacc!=0
120
121 def newfade(self, newlevel, evt=None, length=None):
122
123 # these are currently unused-- Mass needs to accept a speed input
124 mult = 1
125 if evt.state & 8 and evt.state & 4: mult = 0.25 # both
126 elif evt.state & 8: mult = 0.5 # alt
127 elif evt.state & 4: mult = 2 # control
128
129
130 self.mass.x = self.variable.get()
131 self.mass.goto(newlevel)
132
133 self.gofade()
134
135 def gofade(self):
136 self.mass.update()
137 self.variable.set(self.mass.x)
138
139 if not self.mass.ismoving():
140 self.scale['troughcolor'] = self.oldtrough
141 return
142
143 # blink the trough while the thing's moving
144 if time()%.4>.2:
145 # self.scale.config(troughcolor=self.oldtrough)
146 self.scale.config(troughcolor='orange')
147 else:
148 # self.scale.config(troughcolor='white')
149 self.scale.config(troughcolor='yellow')
150
151 # colorfade(self.scale, percent)
152 self.after(30, self.gofade)
153
154 def updatelabel(self, *args):
155 if self.variable:
156 self.vlabel['text'] = "%.3f" % self.variable.get()
157 # if self.fadetimes[1] == 0: # no fade
158 # self.vlabel['fg'] = 'black'
159 # elif self.curfade[1] > self.curfade[0]:
160 # self.vlabel['fg'] = 'red'
161 # else:
162 # self.vlabel['fg'] = 'blue'
163
164 def get(self):
165 return self.scale.get()
166
167 def set(self, val):
168 self.scale.set(val)
169
170 def colorfade(scale, lev):
171 low = (255, 255, 255)
172 high = (0, 0, 0)
173 out = [int(l+lev*(h-l)) for h, l in zip(high,low)]
174 col="#%02X%02X%02X" % tuple(out)
175 scale.config(troughcolor=col)
176
177 if __name__ == '__main__':
178 root = Tk()
179 root.tk_focusFollowsMouse()
180
181 FlyingFader(root, variable=DoubleVar(), label="suck").pack(side=LEFT,
182 expand=1, fill=BOTH)
183 FlyingFader(root, variable=DoubleVar(), label="moof").pack(side=LEFT,
184 expand=1, fill=BOTH)
185 FlyingFader(root, variable=DoubleVar(), label="zarf").pack(side=LEFT,
186 expand=1, fill=BOTH)
187 FlyingFader(root, variable=DoubleVar(),
188 label="long name goes here. got it?").pack(side=LEFT, expand=1,
189 fill=BOTH)
190
191 root.mainloop()