/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classgen.py
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revision 1359 by jonathan, Wed Jul 2 10:51:49 2003 UTC revision 2385 by jan, Thu Oct 7 14:28:51 2004 UTC
# Line 1  Line 1 
1  # Copyright (c) 2003 by Intevation GmbH  # Copyright (c) 2003-2004 by Intevation GmbH
2  # Authors:  # Authors:
3  # Jonathan Coles <[email protected]>  # Jan-Oliver Wagner <[email protected]> (2004)
4    # Bernhard Herzog <[email protected]> (2003)
5    # Thomas K�ster <[email protected]> (2003)
6    # Jonathan Coles <[email protected]> (2003)
7  #  #
8  # This program is free software under the GPL (>=v2)  # This program is free software under the GPL (>=v2)
9  # Read the file COPYING coming with Thuban for details.  # Read the file COPYING coming with Thuban for details.
# Line 26  def generate_singletons(_list, ramp): Line 29  def generate_singletons(_list, ramp):
29      The resulting classification will consist of one group for each      The resulting classification will consist of one group for each
30      item in _list whose properties ramp between 'prop1' and 'prop2'.      item in _list whose properties ramp between 'prop1' and 'prop2'.
31    
32      _list -- any object that implements the iterator interface      _list -- a list of values for each singleton
33    
34      ramp -- an object which implements the CustomRamp interface      ramp -- an object which implements the CustomRamp interface
35      """      """
# Line 35  def generate_singletons(_list, ramp): Line 38  def generate_singletons(_list, ramp):
38    
39      i = 0      i = 0
40      maxValue = float(len(_list) - 1)      maxValue = float(len(_list) - 1)
41        if maxValue < 1: maxValue = 1
42    
43      for value in _list:      for value in _list:
44          prop = ramp.GetProperties(i / maxValue)          prop = ramp.GetProperties(i / maxValue)
45          clazz.AppendGroup(ClassGroupSingleton(value, prop))          clazz.AppendGroup(ClassGroupSingleton(value, prop))
# Line 58  def generate_uniform_distribution(min, m Line 63  def generate_uniform_distribution(min, m
63    
64      end = "["      end = "["
65      maxValue = float(numGroups - 1)      maxValue = float(numGroups - 1)
66        if maxValue < 1: maxValue = 1
67    
68      for i in range(1, numGroups + 1):      for i in range(1, numGroups + 1):
69    
70          prop = ramp.GetProperties(float(i-1) / maxValue)          prop = ramp.GetProperties(float(i-1) / maxValue)
71    
72          if intStep:          if intStep:
73              cur_max = min + int(round((i * (max - min + 1)) / maxValue))              cur_max = min + int(round((i * (max - min + 1)) / float(numGroups)))
74          else:          else:
75              cur_max = min + (i * (max - min)) / maxValue              cur_max = min + (i * (max - min)) / float(numGroups)
76    
77          if i == numGroups:          if i == numGroups:
78              cur_max = max              cur_max = max
# Line 125  def generate_quantiles(_list, percents, Line 132  def generate_quantiles(_list, percents,
132              end = "]"              end = "]"
133    
134              maxValue = float(numGroups - 1)              maxValue = float(numGroups - 1)
135                if maxValue < 1: maxValue = 1
136              for (q, p) in quantiles[3]:              for (q, p) in quantiles[3]:
137    
138                  prop = ramp.GetProperties(float(i-1) / maxValue)                  prop = ramp.GetProperties(float(i-1) / maxValue)
# Line 136  def generate_quantiles(_list, percents, Line 144  def generate_quantiles(_list, percents,
144                      max = _list[q]                      max = _list[q]
145    
146                  group = ClassGroupRange(Range((start, min, max, end)), prop)                  group = ClassGroupRange(Range((start, min, max, end)), prop)
       
                 group.SetLabel("%s%% - %s%%" % (round(oldp*100, 2),  
                                                 round(p*100, 2)))  
                 oldp = p  
                 start = "]"  
                 min = max  
                 clazz.AppendGroup(group)  
                 i += 1  
   
     return (adjusted, clazz)  
147    
 def GenQuantiles0(_list, percents, ramp, _range):  
     """Same as GenQuantiles, but the first class won't be added to  
     the classification.  
   
     Returns a tuple (adjusted, Classification, upper_class0) where  
     upper_class0 is the highest value inside the first class.  
   
     _list -- a sort list of values  
   
     percents -- a sorted list of floats in the range 0.0-1.0 which  
                 represent the upper bound of each quantile. the  
                 union of all percentiles should be the entire  
                 range from 0.0-1.0  
   
     ramp -- an object which implements the CustomRamp interface  
   
     _range -- a Range object  
   
     Raises a Value Error if 'percents' has fewer than two items, or  
     does not cover the entire range.  
     """  
   
     clazz = Classification()  
     quantiles = calculate_quantiles(_list, percents, _range)  
     adjusted = True  
   
     if quantiles is not None:  
   
         numGroups = len(quantiles[3]) - 1  
   
         if numGroups > 0:  
             adjusted = quantiles[0]  
   
             start, min, endMax, right = _range.GetRange()  
   
             class0 = quantiles[3][0]  
             min = _list[class0[0]]  
             oldp = class0[1]  
             i = 1  
             end = "]"  
   
             maxValue = float(numGroups - 1)  
             for (q, p) in quantiles[3][1:]:  
                 prop = ramp.GetProperties(float(i-1) / maxValue)  
   
                 if i == numGroups:  
                     max = endMax  
                     end = right  
                 else:  
                     max = _list[q]  
   
                 group = ClassGroupRange(Range((start, min, max, end)), prop)  
       
148                  group.SetLabel("%s%% - %s%%" % (round(oldp*100, 2),                  group.SetLabel("%s%% - %s%%" % (round(oldp*100, 2),
149                                                  round(p*100, 2)))                                                  round(p*100, 2)))
150                  oldp = p                  oldp = p
# Line 208  def GenQuantiles0(_list, percents, ramp, Line 153  def GenQuantiles0(_list, percents, ramp,
153                  clazz.AppendGroup(group)                  clazz.AppendGroup(group)
154                  i += 1                  i += 1
155    
156      return (adjusted, clazz, _list[class0[0]])      return (adjusted, clazz)
157    
158    
159  def calculate_quantiles(_list, percents, _range):  def calculate_quantiles(_list, percents, _range):
160      """Calculate quantiles for the given _list of percents from the      """Calculate quantiles for the given _list of percents from the
161      sorted list of values that are in range.      sorted list of values that are in range.
162                                                                                
163      This may not actually generate len(percents) quantiles if      This may not actually generate len(percents) quantiles if
164      many of the values that fall on quantile borders are the same.      many of the values that fall on quantile borders are the same.
165    
# Line 371  def calculate_quantiles(_list, percents, Line 316  def calculate_quantiles(_list, percents,
316  class CustomRamp:  class CustomRamp:
317    
318      def __init__(self, prop1, prop2):      def __init__(self, prop1, prop2):
319            """Create a ramp between prop1 and prop2."""
320          self.prop1 = prop1          self.prop1 = prop1
321          self.prop2 = prop2          self.prop2 = prop2
322    
323      def GetRamp(self):      def GetRamp(self):
324            """Return this ramp."""
325          return self          return self
326    
327      def GetProperties(self, index):      def GetProperties(self, index):
# Line 390  class CustomRamp: Line 337  class CustomRamp:
337    
338          newProps = ClassGroupProperties()          newProps = ClassGroupProperties()
339    
340          color1 = self.prop1.GetLineColor()          self.__SetProperty(self.prop1.GetLineColor(),
341          color2 = self.prop2.GetLineColor()                             self.prop2.GetLineColor(),
342                               index, newProps.SetLineColor)
343          self.__SetProperty(color1, color2, index, newProps.SetLineColor)          self.__SetProperty(self.prop1.GetFill(), self.prop2.GetFill(),
344          self.__SetProperty(color1, color2, index, newProps.SetFill)                             index, newProps.SetFill)
345    
346          w = (self.prop2.GetLineWidth() - self.prop1.GetLineWidth()) \          w = (self.prop2.GetLineWidth() - self.prop1.GetLineWidth()) \
347              * index \              * index \
348              + self.prop1.GetLineWidth()              + self.prop1.GetLineWidth()
   
349          newProps.SetLineWidth(int(round(w)))          newProps.SetLineWidth(int(round(w)))
350    
351            s = (self.prop2.GetSize() - self.prop1.GetSize()) \
352                * index \
353                + self.prop1.GetSize()
354            newProps.SetSize(int(round(s)))
355    
356          return newProps          return newProps
357    
358      def __SetProperty(self, color1, color2, index, setf):      def __SetProperty(self, color1, color2, index, setf):
359            """Use setf to set the appropriate property for the point
360            index percent between color1 and color2. setf is a function
361            to call that accepts a Color object or Transparent.
362            """
363    
364          if color1 is Transparent and color2 is Transparent:          if color1 is Transparent and color2 is Transparent:
365              setf(Transparent)              setf(Transparent)
# Line 425  class CustomRamp: Line 380  class CustomRamp:
380                  (color2.blue  - color1.blue)  * index + color1.blue))                  (color2.blue  - color1.blue)  * index + color1.blue))
381    
382  class MonochromaticRamp(CustomRamp):  class MonochromaticRamp(CustomRamp):
383        """Helper class to make ramps between two colors."""
384    
385      def __init__(self, start, end):      def __init__(self, start, end):
386            """Create a Monochromatic Ramp.
387    
388            start -- starting Color
389    
390            end -- ending Color
391            """
392          sp = ClassGroupProperties()          sp = ClassGroupProperties()
393          sp.SetLineColor(start)          sp.SetLineColor(start)
394          sp.SetFill(start)          sp.SetFill(start)
# Line 436  class MonochromaticRamp(CustomRamp): Line 399  class MonochromaticRamp(CustomRamp):
399    
400          CustomRamp.__init__(self, sp, ep)          CustomRamp.__init__(self, sp, ep)
401    
402  GreyRamp       = MonochromaticRamp(Color(1, 1, 1),  Color(0, 0, 0))  grey_ramp         = MonochromaticRamp(Color(1, 1, 1),  Color(0, 0, 0))
403  RedRamp        = MonochromaticRamp(Color(1, 1, 1),  Color(.8, 0, 0))  red_ramp          = MonochromaticRamp(Color(1, 1, 1),  Color(.8, 0, 0))
404  GreenRamp      = MonochromaticRamp(Color(1, 1, 1),  Color(0, .8, 0))  green_ramp        = MonochromaticRamp(Color(1, 1, 1),  Color(0, .8, 0))
405  BlueRamp       = MonochromaticRamp(Color(1, 1, 1),  Color(0, 0, .8))  blue_ramp         = MonochromaticRamp(Color(1, 1, 1),  Color(0, 0, .8))
406  GreenToRedRamp = MonochromaticRamp(Color(1, .8, 1), Color(1, 0, 0))  green_to_red_ramp = MonochromaticRamp(Color(0, .8, 0), Color(1, 0, 0))
407    
408  class HotToColdRamp:  class HotToColdRamp:
409        """A ramp that generates properties with colors ranging from
410        'hot' colors (e.g. red, orange) to 'cold' colors (e.g. green, blue)
411        """
412    
413      def GetRamp(self):      def GetRamp(self):
414            """Return this ramp."""
415          return self          return self
416    
417      def GetProperties(self, index):      def GetProperties(self, index):
# Line 475  class HotToColdRamp: Line 442  class HotToColdRamp:
442    
443          return prop          return prop
444    
445    class FixedRamp:
446        """FixedRamp allows particular properties of a ramp to be
447        held constant over the ramp.
448        """
449    
450        def __init__(self, ramp, fixes):
451            """
452            ramp -- a source ramp to get the default properties
453    
454            fixes -- a tuple (lineColor, lineWidth, fillColor) such that
455                 if any item is not None, the appropriate property will
456                 be fixed to that item value.
457            """
458    
459            self.fixes = fixes
460            self.ramp = ramp
461    
462        def GetRamp(self):
463            """Return this ramp."""
464            return self
465    
466        def GetProperties(self, index):
467            """Return a ClassGroupProperties object whose properties
468            represent a point at 'index' between the properties in
469            the ramp that initialized this FixedRamp.
470    
471            index -- a value such that 0 <= index <= 1
472            """
473    
474            props = self.ramp.GetProperties(index)
475            if self.fixes[0] is not None: props.SetLineColor(self.fixes[0])
476            if self.fixes[1] is not None: props.SetLineWidth(self.fixes[1])
477            if self.fixes[2] is not None: props.SetFill(self.fixes[2])
478    
479            return props
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