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annotate Widgets/FlyingFader.py @ 107:47bda76f5236
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| author | dmcc |
|---|---|
| date | Sun, 21 Jul 2002 07:20:33 +0000 |
| parents | 15ead14b4dd1 |
| children | 0c619695d6c6 |
| rev | line source |
|---|---|
| 52 | 1 from Tix import * |
| 24 | 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 | |
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13 self.eps = .03 # epsilon - numbers within this much are considered the same |
| 24 | 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 | |
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46 if abs(self.xgoal-self.x) < abs(self.v*5*dt): |
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47 # apply the brakes on the last 5 steps |
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48 dir *= -.5 |
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49 |
| 24 | 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 | |
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53 #print "x=%+.03f v=%+.03f a=%+.03f %f" % (self.x,self.v,self.maxaccel,self.xgoal) |
| 24 | 54 |
| 55 def goto(self,newx): | |
| 56 self.xgoal=newx | |
| 57 | |
| 58 def ismoving(self): | |
| 59 return not self._stopped | |
| 0 | 60 |
| 61 class FlyingFader(Frame): | |
| 31 | 62 def __init__(self, master, variable, label, fadedur=1.5, font=('Arial', 8), labelwidth=12, |
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63 **kw): |
| 0 | 64 Frame.__init__(self, master) |
| 65 self.name = label | |
| 66 self.variable = variable | |
| 67 | |
| 24 | 68 self.mass = Mass() |
| 69 | |
| 0 | 70 self.config({'bd':1, 'relief':'raised'}) |
| 22 | 71 scaleopts = {'variable' : variable, 'showvalue' : 0, 'from' : 1.0, |
| 31 | 72 'to' : 0, 'res' : 0.001, 'width' : 20, 'length' : 200, 'orient':'vert'} |
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73 scaleopts.update(kw) |
| 31 | 74 if scaleopts['orient']=='vert': |
| 75 side1=TOP | |
| 76 side2=BOTTOM | |
| 77 else: | |
| 78 side1=RIGHT | |
| 79 side2=LEFT | |
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80 |
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81 self.scale = Scale(self, scaleopts) |
| 22 | 82 self.vlabel = Label(self, text="0.0", width=6, font=font) |
| 31 | 83 self.label = Label(self, text=label, font=font, anchor='w',width=labelwidth) #wraplength=40, ) |
| 0 | 84 |
| 85 self.oldtrough = self.scale['troughcolor'] | |
| 86 | |
| 31 | 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) | |
| 0 | 90 |
| 91 for k in range(1, 10): | |
| 92 self.scale.bind("<Key-%d>" % k, | |
| 20 | 93 lambda evt, k=k: self.newfade(k / 10.0, evt)) |
| 0 | 94 |
| 24 | 95 self.scale.bind("<Key-0>", lambda evt: self.newfade(1.0, evt)) |
| 0 | 96 self.scale.bind("<grave>", lambda evt: self.newfade(0, evt)) |
| 97 | |
| 98 self.scale.bind("<1>", self.cancelfade) | |
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99 self.scale.bind("<2>", self.cancelfade) |
| 0 | 100 self.scale.bind("<3>", self.mousefade) |
| 101 | |
| 50 | 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) | |
| 0 | 107 |
| 108 def cancelfade(self, evt): | |
| 24 | 109 self.fadegoal = self.variable.get() |
| 110 self.fadevel = self.fadeacc = 0 | |
| 111 | |
| 0 | 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 | |
| 24 | 118 def ismoving(self): |
| 119 return self.fadevel!=0 or self.fadeacc!=0 | |
| 22 | 120 |
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121 def newfade(self, newlevel, evt=None, length=None): |
| 24 | 122 |
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123 # these are currently unused-- Mass needs to accept a speed input |
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124 mult = 1 |
| 0 | 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 | |
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129 |
| 24 | 130 self.mass.x = self.variable.get() |
| 131 self.mass.goto(newlevel) | |
| 0 | 132 |
| 133 self.gofade() | |
| 134 | |
| 135 def gofade(self): | |
| 24 | 136 self.mass.update() |
| 137 self.variable.set(self.mass.x) | |
| 138 | |
| 139 if not self.mass.ismoving(): | |
| 0 | 140 self.scale['troughcolor'] = self.oldtrough |
| 141 return | |
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142 |
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143 # blink the trough while the thing's moving |
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144 if time()%.4>.2: |
| 27 | 145 # self.scale.config(troughcolor=self.oldtrough) |
| 146 self.scale.config(troughcolor='orange') | |
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147 else: |
| 27 | 148 # self.scale.config(troughcolor='white') |
| 149 self.scale.config(troughcolor='yellow') | |
| 24 | 150 |
| 151 # colorfade(self.scale, percent) | |
| 22 | 152 self.after(30, self.gofade) |
| 0 | 153 |
| 154 def updatelabel(self, *args): | |
| 52 | 155 if self.variable: |
| 156 self.vlabel['text'] = "%.3f" % self.variable.get() | |
| 24 | 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' | |
| 0 | 163 |
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164 def get(self): |
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165 return self.scale.get() |
| 0 | 166 |
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167 def set(self, val): |
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168 self.scale.set(val) |
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169 |
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170 def colorfade(scale, lev): |
| 0 | 171 low = (255, 255, 255) |
| 172 high = (0, 0, 0) | |
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173 out = [int(l+lev*(h-l)) for h, l in zip(high,low)] |
| 0 | 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() |