Thuban/Model/proj.py

# Copyright (c) 2001 by Intevation GmbH
# Authors:
# Bernhard Herzog <[email protected]>
#
# This program is free software under the GPL (>=v2)
# Read the file COPYING coming with Thuban for details.

__version__ = "$Revision$"

from types import StringTypes

import Projection
BaseProjection = Projection.Projection
del Projection

class Projection(BaseProjection):

    """A proj4 projection object that remembers the parameters"""

    def __init__(self, params, name = "Unknown"):
        BaseProjection.__init__(self, params)
        self.params = params
        self.name = name

    def ForwardBBox(self, bbox):
        """Return the bounding box of the corners of the bounding box bbox
        """
        # This is not really the correct way to determine the bbox of a
        # projected shape, but for now it works well enough
        llx, lly, urx, ury = bbox
        xs = []; ys = []
        x, y = self.Forward(llx, lly)
        xs.append(x); ys.append(y)
        x, y = self.Forward(llx, ury)
        xs.append(x); ys.append(y)
        x, y = self.Forward(urx, ury)
        xs.append(x); ys.append(y)
        x, y = self.Forward(urx, lly)
        xs.append(x); ys.append(y)
        return min(xs), min(ys), max(xs), max(ys)

    def GetName(self):
        return self.name

    def SetName(self, name):
        if isinstance(name, StringTypes):
            self.name = name

    def GetParameter(self, param):

        for pair in self.params:
            p, v = pair.split("=")
            if p == param:
                return v

        return ""

    def GetAllParameters(self):
        return self.params

    def __repr__(self):
        return self.name + ": " + repr(self.params)

class ProjFile:

    def __init__(self, filename):
        self.projs = {}

        self.SetFileName(filename)
    
    def Add(self, proj):
        self.projs[proj] = 0

    def Remove(self, proj):
        if self.projs.has_key(proj):
            del self.projs[proj]

    def GetFileName(self):
        return self.filename

    def SetFileName(self, filename):
        self.filename = filename

    def GetProjections(self):
        return self.projs.keys()
1	bh	6	# Copyright (c) 2001 by Intevation GmbH
2			# Authors:
3			# Bernhard Herzog <[email protected]>
4			#
5			# This program is free software under the GPL (>=v2)
6			# Read the file COPYING coming with Thuban for details.
7
8			__version__ = "$Revision$"
9
10	jonathan	726	from types import StringTypes
11
12	bh	6	import Projection
13			BaseProjection = Projection.Projection
14			del Projection
15
16			class Projection(BaseProjection):
17
18			"""A proj4 projection object that remembers the parameters"""
19
20	jonathan	695	def __init__(self, params, name = "Unknown"):
21	bh	6	BaseProjection.__init__(self, params)
22			self.params = params
23	jonathan	695	self.name = name
24	bh	6
25			def ForwardBBox(self, bbox):
26			"""Return the bounding box of the corners of the bounding box bbox
27			"""
28			# This is not really the correct way to determine the bbox of a
29			# projected shape, but for now it works well enough
30			llx, lly, urx, ury = bbox
31			xs = []; ys = []
32			x, y = self.Forward(llx, lly)
33			xs.append(x); ys.append(y)
34			x, y = self.Forward(llx, ury)
35			xs.append(x); ys.append(y)
36			x, y = self.Forward(urx, ury)
37			xs.append(x); ys.append(y)
38			x, y = self.Forward(urx, lly)
39			xs.append(x); ys.append(y)
40			return min(xs), min(ys), max(xs), max(ys)
41	jonathan	695
42			def GetName(self):
43			return self.name
44
45	jonathan	726	def SetName(self, name):
46			if isinstance(name, StringTypes):
47			self.name = name
48
49	jonathan	708	def GetParameter(self, param):
50
51			for pair in self.params:
52			p, v = pair.split("=")
53			if p == param:
54			return v
55
56			return ""
57
58			def GetAllParameters(self):
59	jonathan	695	return self.params
60
61			def __repr__(self):
62	jonathan	726	return self.name + ": " + repr(self.params)
63	jonathan	695
64			class ProjFile:
65
66			def __init__(self, filename):
67	jonathan	726	self.projs = {}
68	jonathan	695
69			self.SetFileName(filename)
70
71			def Add(self, proj):
72	jonathan	726	self.projs[proj] = 0
73	jonathan	695
74	jonathan	726	def Remove(self, proj):
75			if self.projs.has_key(proj):
76			del self.projs[proj]
77
78	jonathan	695	def GetFileName(self):
79			return self.filename
80
81			def SetFileName(self, filename):
82			self.filename = filename
83
84			def GetProjections(self):
85	jonathan	726	return self.projs.keys()
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svn:keywords	Author Date Id Revision