/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/Model/classgen.py
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revision 1425 by jonathan, Wed Jul 16 13:21:59 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 141  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)  
   
 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  
147    
         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)  
             if maxValue < 1: maxValue = 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 214  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 377  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 407  class CustomRamp: Line 348  class CustomRamp:
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 430  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 441  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(0, .8, 0), 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 498  class FixedRamp: Line 460  class FixedRamp:
460          self.ramp = ramp          self.ramp = ramp
461    
462      def GetRamp(self):      def GetRamp(self):
463            """Return this ramp."""
464          return self          return self
465    
466      def GetProperties(self, index):      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)          props = self.ramp.GetProperties(index)
475          if self.fixes[0] is not None: props.SetLineColor(self.fixes[0])          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])          if self.fixes[1] is not None: props.SetLineWidth(self.fixes[1])
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