author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Wed, 15 Apr 2009 15:56:17 +0000 | |
changeset 2185 | 09ca8e661728 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
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Load ../vendor/django into trunk/app/django.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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1 |
""" |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
2 |
The GDAL/OGR library uses an Envelope structure to hold the bounding |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
3 |
box information for a geometry. The envelope (bounding box) contains |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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|
4 |
two pairs of coordinates, one for the lower left coordinate and one |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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5 |
for the upper right coordinate: |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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6 |
|
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parents:
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7 |
+----------o Upper right; (max_x, max_y) |
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parents:
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8 |
| | |
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parents:
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9 |
| | |
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parents:
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10 |
| | |
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parents:
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11 |
Lower left (min_x, min_y) o----------+ |
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parents:
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12 |
""" |
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parents:
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13 |
from ctypes import Structure, c_double |
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14 |
from types import TupleType, ListType |
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15 |
from django.contrib.gis.gdal.error import OGRException |
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16 |
|
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parents:
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17 |
# The OGR definition of an Envelope is a C structure containing four doubles. |
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parents:
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18 |
# See the 'ogr_core.h' source file for more information: |
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19 |
# http://www.gdal.org/ogr/ogr__core_8h-source.html |
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20 |
class OGREnvelope(Structure): |
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21 |
"Represents the OGREnvelope C Structure." |
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parents:
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22 |
_fields_ = [("MinX", c_double), |
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23 |
("MaxX", c_double), |
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24 |
("MinY", c_double), |
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25 |
("MaxY", c_double), |
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26 |
] |
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27 |
|
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28 |
class Envelope(object): |
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29 |
""" |
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30 |
The Envelope object is a C structure that contains the minimum and |
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parents:
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31 |
maximum X, Y coordinates for a rectangle bounding box. The naming |
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parents:
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32 |
of the variables is compatible with the OGR Envelope structure. |
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33 |
""" |
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parents:
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34 |
|
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35 |
def __init__(self, *args): |
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36 |
""" |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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37 |
The initialization function may take an OGREnvelope structure, 4-element |
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parents:
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38 |
tuple or list, or 4 individual arguments. |
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Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
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39 |
""" |
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parents:
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40 |
|
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41 |
if len(args) == 1: |
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42 |
if isinstance(args[0], OGREnvelope): |
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parents:
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43 |
# OGREnvelope (a ctypes Structure) was passed in. |
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44 |
self._envelope = args[0] |
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45 |
elif isinstance(args[0], (TupleType, ListType)): |
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46 |
# A tuple was passed in. |
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47 |
if len(args[0]) != 4: |
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48 |
raise OGRException('Incorrect number of tuple elements (%d).' % len(args[0])) |
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49 |
else: |
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50 |
self._from_sequence(args[0]) |
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51 |
else: |
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52 |
raise TypeError('Incorrect type of argument: %s' % str(type(args[0]))) |
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53 |
elif len(args) == 4: |
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54 |
# Individiual parameters passed in. |
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55 |
# Thanks to ww for the help |
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56 |
self._from_sequence(map(float, args)) |
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57 |
else: |
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58 |
raise OGRException('Incorrect number (%d) of arguments.' % len(args)) |
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59 |
|
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60 |
# Checking the x,y coordinates |
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61 |
if self.min_x >= self.max_x: |
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62 |
raise OGRException('Envelope minimum X >= maximum X.') |
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63 |
if self.min_y >= self.max_y: |
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64 |
raise OGRException('Envelope minimum Y >= maximum Y.') |
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65 |
|
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66 |
def __eq__(self, other): |
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67 |
""" |
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68 |
Returns True if the envelopes are equivalent; can compare against |
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69 |
other Envelopes and 4-tuples. |
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70 |
""" |
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71 |
if isinstance(other, Envelope): |
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72 |
return (self.min_x == other.min_x) and (self.min_y == other.min_y) and \ |
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73 |
(self.max_x == other.max_x) and (self.max_y == other.max_y) |
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74 |
elif isinstance(other, TupleType) and len(other) == 4: |
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75 |
return (self.min_x == other[0]) and (self.min_y == other[1]) and \ |
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76 |
(self.max_x == other[2]) and (self.max_y == other[3]) |
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77 |
else: |
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78 |
raise OGRException('Equivalence testing only works with other Envelopes.') |
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79 |
|
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80 |
def __str__(self): |
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81 |
"Returns a string representation of the tuple." |
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82 |
return str(self.tuple) |
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83 |
|
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84 |
def _from_sequence(self, seq): |
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85 |
"Initializes the C OGR Envelope structure from the given sequence." |
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86 |
self._envelope = OGREnvelope() |
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87 |
self._envelope.MinX = seq[0] |
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88 |
self._envelope.MinY = seq[1] |
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89 |
self._envelope.MaxX = seq[2] |
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90 |
self._envelope.MaxY = seq[3] |
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91 |
|
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92 |
@property |
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93 |
def min_x(self): |
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94 |
"Returns the value of the minimum X coordinate." |
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95 |
return self._envelope.MinX |
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96 |
|
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97 |
@property |
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98 |
def min_y(self): |
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99 |
"Returns the value of the minimum Y coordinate." |
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100 |
return self._envelope.MinY |
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101 |
|
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102 |
@property |
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103 |
def max_x(self): |
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104 |
"Returns the value of the maximum X coordinate." |
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105 |
return self._envelope.MaxX |
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106 |
|
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107 |
@property |
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108 |
def max_y(self): |
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109 |
"Returns the value of the maximum Y coordinate." |
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110 |
return self._envelope.MaxY |
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parents:
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111 |
|
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112 |
@property |
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113 |
def ur(self): |
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parents:
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114 |
"Returns the upper-right coordinate." |
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parents:
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115 |
return (self.max_x, self.max_y) |
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116 |
|
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117 |
@property |
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parents:
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118 |
def ll(self): |
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119 |
"Returns the lower-left coordinate." |
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120 |
return (self.min_x, self.min_y) |
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121 |
|
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parents:
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122 |
@property |
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parents:
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123 |
def tuple(self): |
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124 |
"Returns a tuple representing the envelope." |
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125 |
return (self.min_x, self.min_y, self.max_x, self.max_y) |
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parents:
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126 |
|
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parents:
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127 |
@property |
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parents:
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128 |
def wkt(self): |
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129 |
"Returns WKT representing a Polygon for this envelope." |
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130 |
# TODO: Fix significant figures. |
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131 |
return 'POLYGON((%s %s,%s %s,%s %s,%s %s,%s %s))' % \ |
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parents:
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132 |
(self.min_x, self.min_y, self.min_x, self.max_y, |
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parents:
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133 |
self.max_x, self.max_y, self.max_x, self.min_y, |
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parents:
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134 |
self.min_x, self.min_y) |