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# Copyright (c) 2001 by Intevation GmbH |
# Copyright (c) 2001, 2003 by Intevation GmbH |
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# Authors: |
# Authors: |
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# Jonathan Coles <[email protected]> |
# Jonathan Coles <[email protected]> |
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# |
# |
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First, specific values can be associated with data. |
First, specific values can be associated with data. |
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Second, ranges can be associated with data such that if |
Second, ranges can be associated with data such that if |
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an input value falls with a range that data is returned. |
an input value falls with a range that data is returned. |
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If no mapping can be found then a NullData data will |
If no mapping can be found then default data will |
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be returned. Input values must be hashable objects |
be returned. Input values must be hashable objects |
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|
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See the description of getProperties() for more information |
See the description of FindGroup() for more information |
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on the mapping algorithm. |
on the mapping algorithm. |
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""" |
""" |
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import copy, operator, types |
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from Thuban import _ |
from Thuban import _ |
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from Thuban.Model.color import Color |
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from wxPython.wx import * |
from messages import \ |
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LAYER_PROJECTION_CHANGED, \ |
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LAYER_LEGEND_CHANGED, \ |
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LAYER_VISIBILITY_CHANGED,\ |
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CLASS_CHANGED |
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from Thuban.Model.color import Color, Transparent, Black |
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from Thuban.Model.range import Range |
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import Thuban.Model.layer |
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from Thuban.Lib.connector import Publisher |
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class Classification(Publisher): |
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"""Encapsulates the classification of layer. |
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The Classification divides some kind of data into Groups which |
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are associated with properties. Later the properties can be |
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retrieved by matching data values to the appropriate group. |
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""" |
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def __init__(self): |
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"""Initialize a classification.""" |
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self.__groups = [] |
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self.SetDefaultGroup(ClassGroupDefault()) |
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def __iter__(self): |
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return ClassIterator(self.__groups) |
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# constants |
def __deepcopy__(self, memo): |
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RANGE_MIN = 0 |
clazz = Classification() |
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RANGE_MAX = 1 |
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RANGE_DATA = 2 |
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class Classification: |
clazz.__groups[0] = copy.deepcopy(self.__groups[0]) |
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for i in range(1, len(self.__groups)): |
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clazz.__groups.append(copy.deepcopy(self.__groups[i])) |
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def __init__(self, field = None): |
return clazz |
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"""Initialize a classification. |
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field -- the name of the data table field that |
def __SendNotification(self): |
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is to be used to classify layer properties |
"""Notify the layer that this class has changed.""" |
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self.issue(CLASS_CHANGED) |
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# |
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# these SetDefault* methods are really only provided for |
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# some backward compatibility. they should be considered |
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# for removal once all the classification code is finished. |
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# |
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def SetDefaultFill(self, fill): |
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"""Set the default fill color. |
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fill -- a Color object. |
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""" |
""" |
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self.GetDefaultGroup().GetProperties().SetFill(fill) |
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self.points = {} |
self.__SendNotification() |
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self.ranges = [] |
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self.setField(field) |
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self.setNull(None) |
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def setField(self, field): |
def GetDefaultFill(self): |
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"""Set the name of the data table field to use. |
"""Return the default fill color.""" |
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return self.GetDefaultGroup().GetProperties().GetFill() |
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field -- if None then all values map to NullData |
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def SetDefaultLineColor(self, color): |
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"""Set the default line color. |
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color -- a Color object. |
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""" |
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self.GetDefaultGroup().GetProperties().SetLineColor(color) |
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self.__SendNotification() |
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def GetDefaultLineColor(self): |
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"""Return the default line color.""" |
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return self.GetDefaultGroup().GetProperties().GetLineColor() |
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def SetDefaultLineWidth(self, lineWidth): |
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"""Set the default line width. |
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lineWidth -- an integer > 0. |
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""" |
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assert isinstance(lineWidth, types.IntType) |
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self.GetDefaultGroup().GetProperties().SetLineWidth(lineWidth) |
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self.__SendNotification() |
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def GetDefaultLineWidth(self): |
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"""Return the default line width.""" |
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return self.GetDefaultGroup().GetProperties().GetLineWidth() |
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# |
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# The methods that manipulate self.__groups have to be kept in |
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# sync. We store the default group in index 0 to make it |
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# convienent to iterate over the classification's groups, but |
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# from the user's perspective the first (non-default) group is |
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# at index 0 and the DefaultGroup is a special entity. |
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# |
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def SetDefaultGroup(self, group): |
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"""Set the group to be used when a value can't be classified. |
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group -- group that the value maps to. |
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""" |
""" |
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self.field = field |
assert isinstance(group, ClassGroupDefault) |
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if len(self.__groups) > 0: |
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self.__groups[0] = group |
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else: |
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self.__groups.append(group) |
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def GetDefaultGroup(self): |
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"""Return the default group.""" |
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return self.__groups[0] |
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def setNull(self, data): |
def AppendGroup(self, item): |
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"""Set the data to be used when a value can't be classified. |
"""Append a new ClassGroup item to the classification. |
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data -- data that the value maps to. See class description. |
item -- this must be a valid ClassGroup object |
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""" |
""" |
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self.NullData = data |
self.InsertGroup(self.GetNumGroups(), item) |
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def InsertGroup(self, index, group): |
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assert isinstance(group, ClassGroup) |
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self.__groups.insert(index + 1, group) |
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self.__SendNotification() |
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def RemoveGroup(self, index): |
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return self.__groups.pop(index + 1) |
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def ReplaceGroup(self, index, group): |
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assert isinstance(group, ClassGroup) |
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self.__groups[index + 1] = group |
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self.__SendNotification() |
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def GetGroup(self, index): |
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return self.__groups[index + 1] |
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def addRange(self, min, max, data): |
def GetNumGroups(self): |
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"""Add a new range to the classification. |
"""Return the number of non-default groups in the classification.""" |
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return len(self.__groups) - 1 |
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A range allows a value to be classified if it falls between |
def FindGroup(self, value): |
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min and max. Specifically, min <= value < max |
"""Return the associated group, or the default group. |
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min -- the lower bound. |
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max -- the upper bound. |
Groups are checked in the order the were added to the |
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Classification. |
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data -- data that the value maps to. See class description. |
value -- the value to classify. If there is no mapping, |
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the field is None or value is None, |
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return the default properties |
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""" |
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if value is not None: |
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for i in range(1, len(self.__groups)): |
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group = self.__groups[i] |
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if group.Matches(value): |
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return group |
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return self.GetDefaultGroup() |
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def GetProperties(self, value): |
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"""Return the properties associated with the given value. |
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Use this function rather than Classification.FindGroup().GetProperties() |
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since the returned group may be a ClassGroupMap which doesn't support |
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a call to GetProperties(). |
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""" |
""" |
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if min >= max: |
group = self.FindGroup(value) |
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raise ValueError(_("Range minimum >= maximum!")) |
if isinstance(group, ClassGroupMap): |
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self.ranges.append([min, max, data]) |
return group.GetPropertiesFromValue(value) |
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else: |
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return group.GetProperties() |
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def TreeInfo(self): |
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items = [] |
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def build_color_item(text, color): |
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if color is Transparent: |
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return ("%s: %s" % (text, _("None")), None) |
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return ("%s: (%.3f, %.3f, %.3f)" % |
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(text, color.red, color.green, color.blue), |
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color) |
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def build_item(group, string): |
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label = group.GetLabel() |
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if label == "": |
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label = string |
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else: |
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label += " (%s)" % string |
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props = group.GetProperties() |
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i = [] |
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v = props.GetLineColor() |
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i.append(build_color_item(_("Line Color"), v)) |
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v = props.GetLineWidth() |
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i.append(_("Line Width: %s") % v) |
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v = props.GetFill() |
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i.append(build_color_item(_("Fill"), v)) |
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return (label, i) |
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for p in self: |
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items.append(build_item(p, p.GetDisplayText())) |
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return (_("Classification"), items) |
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class ClassIterator: |
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"""Allows the Groups in a Classifcation to be interated over. |
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def addPoint(self, value, data): |
The items are returned in the following order: |
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"""Associate a single value with data. |
default data, singletons, ranges, maps |
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""" |
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When this value is to be classified data will be returned. |
def __init__(self, data): #default, points, ranges, maps): |
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"""Constructor. |
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value -- classification value. |
default -- the default group |
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points -- a list of singleton groups |
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data -- data that the value maps to. See class description. |
ranges -- a list of range groups |
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maps -- a list of map groups |
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""" |
""" |
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self.points[value] = data |
self.data = data |
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self.data_index = 0 |
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def __iter__(self): |
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return self |
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def getProperties(self, value): |
def next(self): |
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"""Return the associated data, or the NullData. |
"""Return the next item.""" |
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if self.data_index >= len(self.data): |
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raise StopIteration |
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else: |
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d = self.data[self.data_index] |
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self.data_index += 1 |
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return d |
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class ClassGroupProperties: |
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"""Represents the properties of a single Classification Group. |
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These are used when rendering a layer.""" |
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The following search technique is used: |
def __init__(self, props = None): |
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(1) if the field is None, return NullData |
"""Constructor. |
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(2) check if the value exists as a single value |
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(3) check if the value falls within a range. Ranges |
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are checked in the order they were added to |
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the classification. |
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value -- the value to classify. If there is no mapping |
props -- a ClassGroupProperties object. The class is copied if |
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return the NullData (which may be None) |
prop is not None. Otherwise, a default set of properties |
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is created such that: line color = Black, line width = 1, |
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and fill color = Transparent |
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""" |
""" |
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if self.field is not None: |
if props is not None: |
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# |
self.SetProperties(props) |
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# first check the discrete values |
else: |
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# |
self.SetLineColor(Black) |
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if self.points.has_key(value): |
self.SetLineWidth(1) |
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return self.points[value] |
self.SetFill(Transparent) |
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def SetProperties(self, props): |
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"""Set this class's properties to those in class props.""" |
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assert isinstance(props, ClassGroupProperties) |
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self.SetLineColor(props.GetLineColor()) |
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self.SetLineWidth(props.GetLineWidth()) |
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self.SetFill(props.GetFill()) |
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def GetLineColor(self): |
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"""Return the line color as a Color object.""" |
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return self.__stroke |
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# |
def SetLineColor(self, color): |
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# now check the ranges |
"""Set the line color. |
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# |
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for p in self.ranges: |
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if (p[RANGE_MIN] <= value) and (value < p[RANGE_MAX]): |
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return p[RANGE_DATA] |
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color -- the color of the line. This must be a Color object. |
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""" |
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return self.NullData |
self.__stroke = color |
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def TreeInfo(self): |
def GetLineWidth(self): |
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items = [] |
"""Return the line width.""" |
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return self.__strokeWidth |
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def SetLineWidth(self, lineWidth): |
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"""Set the line width. |
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lineWidth -- the new line width. This must be > 0. |
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""" |
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assert isinstance(lineWidth, types.IntType) |
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if (lineWidth < 1): |
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raise ValueError(_("lineWidth < 1")) |
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self.__strokeWidth = lineWidth |
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def GetFill(self): |
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"""Return the fill color as a Color object.""" |
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return self.__fill |
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def SetFill(self, fill): |
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"""Set the fill color. |
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fill -- the color of the fill. This must be a Color object. |
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""" |
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self.__fill = fill |
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def __eq__(self, other): |
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"""Return true if 'props' has the same attributes as this class""" |
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# |
# |
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# shouldn't print anything if there are no classifications |
# using 'is' over '==' results in a huge performance gain |
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# in the renderer |
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# |
# |
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return isinstance(other, ClassGroupProperties) \ |
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and (self.__stroke is other.__stroke or \ |
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self.__stroke == other.__stroke) \ |
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and (self.__fill is other.__fill or \ |
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self.__fill == other.__fill) \ |
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and self.__strokeWidth == other.__strokeWidth |
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def __ne__(self, other): |
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def color_string(color): |
return not self.__eq__(other) |
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if color is None: |
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return "None" |
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return "(%.3f, %.3f, %.3f)" % (color.red, color.green, color.blue) |
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if self.NullData is not None: |
def __copy__(self): |
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i = [] |
return ClassGroupProperties(self) |
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for key, value in self.NullData.items(): |
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if isinstance(value, Color): |
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i.append((_("%s: %s") % (key, color_string(value)), value)) |
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else: |
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i.append(_("%s: %s") % (key, value)) |
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items.append((_("'NULL'"), i)) |
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for name, data in self.points.items(): |
def __deepcopy__(self): |
358 |
i = [] |
return ClassGroupProperties(self) |
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for key, value in data.items(): |
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if isinstance(value, Color): |
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i.append((_("%s: %s") % (key, color_string(value)), value)) |
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else: |
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i.append(_("%s: %s") % (key, value)) |
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items.append((_("%s") % name, i)) |
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for p in self.ranges: |
def __repr__(self): |
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i = [] |
return repr((self.__stroke, self.__strokeWidth, self.__fill)) |
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data = p[RANGE_DATA] |
|
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for key, value in data.items(): |
class ClassGroup: |
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if isinstance(value, Color): |
"""A base class for all Groups within a Classification""" |
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i.append((_("%s: %s") % (key, color_string(value)), value)) |
|
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else: |
def __init__(self, label = "", props = None, group = None): |
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i.append(_("%s: %s") % (key, value)) |
"""Constructor. |
368 |
items.append((_("%s-%s") % (p[RANGE_MIN], p[RANGE_MAX], i))) |
|
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label -- A string representing the Group's label |
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return (_("Classifications"), items) |
""" |
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if group is not None: |
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self.SetLabel(copy.copy(group.GetLabel())) |
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self.SetProperties(copy.copy(group.GetProperties())) |
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self.SetVisible(group.IsVisible()) |
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else: |
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self.SetLabel(label) |
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self.SetProperties(props) |
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self.SetVisible(True) |
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def GetLabel(self): |
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"""Return the Group's label.""" |
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return self.label |
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def SetLabel(self, label): |
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"""Set the Group's label. |
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|
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label -- a string representing the Group's label. This must |
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not be None. |
390 |
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""" |
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assert isinstance(label, types.StringTypes) |
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self.label = label |
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def GetDisplayText(self): |
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assert False, "GetDisplay must be overridden by subclass!" |
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return "" |
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def Matches(self, value): |
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"""Determines if this Group is associated with the given value. |
400 |
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Returns False. This needs to be overridden by all subclasses. |
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""" |
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assert False, "GetMatches must be overridden by subclass!" |
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return False |
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|
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def GetProperties(self): |
407 |
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"""Return the properties associated with the given value.""" |
408 |
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return self.prop |
410 |
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|
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def SetProperties(self, prop): |
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"""Set the properties associated with this Group. |
413 |
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|
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prop -- a ClassGroupProperties object. if prop is None, |
415 |
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a default set of properties is created. |
416 |
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""" |
417 |
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|
418 |
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if prop is None: prop = ClassGroupProperties() |
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assert isinstance(prop, ClassGroupProperties) |
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self.prop = prop |
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|
422 |
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def IsVisible(self): |
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return self.visible |
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|
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def SetVisible(self, visible): |
426 |
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self.visible = visible |
427 |
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|
428 |
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def __eq__(self, other): |
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return isinstance(other, ClassGroup) \ |
430 |
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and self.label == other.label \ |
431 |
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and self.GetProperties() == other.GetProperties() |
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|
433 |
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def __ne__(self, other): |
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return not self.__eq__(other) |
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|
436 |
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def __repr__(self): |
437 |
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return repr(self.label) + ", " + repr(self.GetProperties()) |
438 |
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|
439 |
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class ClassGroupSingleton(ClassGroup): |
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"""A Group that is associated with a single value.""" |
441 |
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|
442 |
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def __init__(self, value = 0, props = None, label = "", group = None): |
443 |
|
"""Constructor. |
444 |
|
|
445 |
|
value -- the associated value. |
446 |
|
|
447 |
|
prop -- a ClassGroupProperites object. If prop is None a default |
448 |
|
set of properties is created. |
449 |
|
|
450 |
|
label -- a label for this group. |
451 |
|
""" |
452 |
|
ClassGroup.__init__(self, label, props, group) |
453 |
|
|
454 |
|
self.SetValue(value) |
455 |
|
|
456 |
|
def __copy__(self): |
457 |
|
return ClassGroupSingleton(self.GetValue(), |
458 |
|
self.GetProperties(), |
459 |
|
self.GetLabel()) |
460 |
|
|
461 |
|
def __deepcopy__(self, memo): |
462 |
|
return ClassGroupSingleton(self.GetValue(), group = self) |
463 |
|
|
464 |
|
def GetValue(self): |
465 |
|
"""Return the associated value.""" |
466 |
|
return self.__value |
467 |
|
|
468 |
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def SetValue(self, value): |
469 |
|
"""Associate this Group with the given value.""" |
470 |
|
self.__value = value |
471 |
|
|
472 |
|
def Matches(self, value): |
473 |
|
"""Determine if the given value matches the associated Group value.""" |
474 |
|
|
475 |
|
"""Returns True if the value matches, False otherwise.""" |
476 |
|
|
477 |
|
return self.__value == value |
478 |
|
|
479 |
|
def GetDisplayText(self): |
480 |
|
label = self.GetLabel() |
481 |
|
|
482 |
|
if label != "": return label |
483 |
|
|
484 |
|
return str(self.GetValue()) |
485 |
|
|
486 |
|
def __eq__(self, other): |
487 |
|
return ClassGroup.__eq__(self, other) \ |
488 |
|
and isinstance(other, ClassGroupSingleton) \ |
489 |
|
and self.__value == other.__value |
490 |
|
|
491 |
|
def __repr__(self): |
492 |
|
return "(" + repr(self.__value) + ", " + ClassGroup.__repr__(self) + ")" |
493 |
|
|
494 |
|
class ClassGroupDefault(ClassGroup): |
495 |
|
"""The default Group. When values do not match any other |
496 |
|
Group within a Classification, the properties from this |
497 |
|
class are used.""" |
498 |
|
|
499 |
|
def __init__(self, props = None, label = "", group = None): |
500 |
|
"""Constructor. |
501 |
|
|
502 |
|
prop -- a ClassGroupProperites object. If prop is None a default |
503 |
|
set of properties is created. |
504 |
|
|
505 |
|
label -- a label for this group. |
506 |
|
""" |
507 |
|
|
508 |
|
ClassGroup.__init__(self, label, props, group) |
509 |
|
|
510 |
|
def __copy__(self): |
511 |
|
return ClassGroupDefault(self.GetProperties(), self.GetLabel()) |
512 |
|
|
513 |
|
def __deepcopy__(self, memo): |
514 |
|
return ClassGroupDefault(label = self.GetLabel(), group = self) |
515 |
|
|
516 |
|
def Matches(self, value): |
517 |
|
return True |
518 |
|
|
519 |
|
def GetDisplayText(self): |
520 |
|
label = self.GetLabel() |
521 |
|
|
522 |
|
if label != "": return label |
523 |
|
|
524 |
|
return _("DEFAULT") |
525 |
|
|
526 |
|
def __eq__(self, other): |
527 |
|
return ClassGroup.__eq__(self, other) \ |
528 |
|
and isinstance(other, ClassGroupDefault) \ |
529 |
|
and self.GetProperties() == other.GetProperties() |
530 |
|
|
531 |
|
def __repr__(self): |
532 |
|
return "(" + ClassGroup.__repr__(self) + ")" |
533 |
|
|
534 |
|
class ClassGroupRange(ClassGroup): |
535 |
|
"""A Group that represents a range of values that map to the same |
536 |
|
set of properties.""" |
537 |
|
|
538 |
|
def __init__(self, _range = (0,1), props = None, label = "", group=None): |
539 |
|
"""Constructor. |
540 |
|
|
541 |
|
The minumum value must be strictly less than the maximum. |
542 |
|
|
543 |
|
_range -- either a tuple (min, max) where min < max or |
544 |
|
a Range object |
545 |
|
|
546 |
|
prop -- a ClassGroupProperites object. If prop is None a default |
547 |
|
set of properties is created. |
548 |
|
|
549 |
|
label -- a label for this group. |
550 |
|
""" |
551 |
|
|
552 |
|
ClassGroup.__init__(self, label, props, group) |
553 |
|
self.SetRange(_range) |
554 |
|
|
555 |
|
def __copy__(self): |
556 |
|
return ClassGroupRange(self.__range, |
557 |
|
props = self.GetProperties(), |
558 |
|
label = self.GetLabel()) |
559 |
|
|
560 |
|
def __deepcopy__(self, memo): |
561 |
|
return ClassGroupRange(copy.copy(self.__range), |
562 |
|
group = self) |
563 |
|
|
564 |
|
def GetMin(self): |
565 |
|
"""Return the range's minimum value.""" |
566 |
|
return self.__range.GetRange()[1] |
567 |
|
|
568 |
|
def SetMin(self, min): |
569 |
|
"""Set the range's minimum value. |
570 |
|
|
571 |
|
min -- the new minimum. Note that this must be less than the current |
572 |
|
maximum value. Use SetRange() to change both min and max values. |
573 |
|
""" |
574 |
|
|
575 |
|
self.SetRange((min, self.__range.GetRange()[2])) |
576 |
|
|
577 |
|
def GetMax(self): |
578 |
|
"""Return the range's maximum value.""" |
579 |
|
return self.__range.GetRange()[2] |
580 |
|
|
581 |
|
def SetMax(self, max): |
582 |
|
"""Set the range's maximum value. |
583 |
|
|
584 |
|
max -- the new maximum. Note that this must be greater than the current |
585 |
|
minimum value. Use SetRange() to change both min and max values. |
586 |
|
""" |
587 |
|
self.SetRange((self.__range.GetRange()[1], max)) |
588 |
|
|
589 |
|
def SetRange(self, _range): |
590 |
|
"""Set a new range. |
591 |
|
|
592 |
|
_range -- Either a tuple (min, max) where min < max or |
593 |
|
a Range object. |
594 |
|
|
595 |
|
Raises ValueError on error. |
596 |
|
""" |
597 |
|
|
598 |
|
if isinstance(_range, Range): |
599 |
|
self.__range = _range |
600 |
|
elif isinstance(_range, types.TupleType) and len(_range) == 2: |
601 |
|
self.__range = Range(("[", _range[0], _range[1], "[")) |
602 |
|
else: |
603 |
|
raise ValueError() |
604 |
|
|
605 |
|
def GetRange(self): |
606 |
|
"""Return the range as a string""" |
607 |
|
return self.__range.string(self.__range.GetRange()) |
608 |
|
|
609 |
|
def Matches(self, value): |
610 |
|
"""Determine if the given value lies with the current range. |
611 |
|
|
612 |
|
The following check is used: min <= value < max. |
613 |
|
""" |
614 |
|
|
615 |
|
return operator.contains(self.__range, value) |
616 |
|
|
617 |
|
def GetDisplayText(self): |
618 |
|
label = self.GetLabel() |
619 |
|
|
620 |
|
if label != "": return label |
621 |
|
|
622 |
|
return self.__range.string(self.__range.GetRange()) |
623 |
|
|
624 |
|
def __eq__(self, other): |
625 |
|
return ClassGroup.__eq__(self, other) \ |
626 |
|
and isinstance(other, ClassGroupRange) \ |
627 |
|
and self.__range == other.__range |
628 |
|
|
629 |
|
def __repr__(self): |
630 |
|
return "(" + str(self.__range) + ClassGroup.__repr__(self) + ")" |
631 |
|
|
632 |
|
class ClassGroupMap(ClassGroup): |
633 |
|
"""Currently, this class is not used.""" |
634 |
|
|
635 |
|
FUNC_ID = "id" |
636 |
|
|
637 |
|
def __init__(self, map_type = FUNC_ID, func = None, prop = None, label=""): |
638 |
|
ClassGroup.__init__(self, label) |
639 |
|
|
640 |
|
self.map_type = map_type |
641 |
|
self.func = func |
642 |
|
|
643 |
|
if self.func is None: |
644 |
|
self.func = func_id |
645 |
|
|
646 |
|
def Map(self, value): |
647 |
|
return self.func(value) |
648 |
|
|
649 |
|
def GetProperties(self): |
650 |
|
return None |
651 |
|
|
652 |
|
def GetPropertiesFromValue(self, value): |
653 |
|
pass |
654 |
|
|
655 |
|
def GetDisplayText(self): |
656 |
|
return "Map: " + self.map_type |
657 |
|
|
658 |
|
# |
659 |
|
# built-in mappings |
660 |
|
# |
661 |
|
def func_id(value): |
662 |
|
return value |
663 |
|
|