author | Lennard de Rijk <ljvderijk@gmail.com> |
Tue, 07 Apr 2009 22:20:23 +0000 | |
changeset 2125 | c24e8423cd1a |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
323
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Load ../vendor/django into trunk/app/django.
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1 |
""" |
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2 |
This module houses the GEOSCoordSeq object, which is used internally |
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3 |
by GEOSGeometry to house the actual coordinates of the Point, |
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4 |
LineString, and LinearRing geometries. |
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5 |
""" |
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6 |
from ctypes import c_double, c_uint, byref |
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7 |
from types import ListType, TupleType |
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8 |
from django.contrib.gis.geos.error import GEOSException, GEOSIndexError |
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9 |
from django.contrib.gis.geos.libgeos import CS_PTR, HAS_NUMPY |
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10 |
from django.contrib.gis.geos.prototypes import cs_clone, cs_getdims, cs_getordinate, cs_getsize, cs_setordinate |
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11 |
if HAS_NUMPY: from numpy import ndarray |
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12 |
|
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13 |
class GEOSCoordSeq(object): |
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14 |
"The internal representation of a list of coordinates inside a Geometry." |
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|
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16 |
#### Python 'magic' routines #### |
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17 |
def __init__(self, ptr, z=False): |
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18 |
"Initializes from a GEOS pointer." |
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19 |
if not isinstance(ptr, CS_PTR): |
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20 |
raise TypeError('Coordinate sequence should initialize with a CS_PTR.') |
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21 |
self._ptr = ptr |
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22 |
self._z = z |
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23 |
|
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24 |
def __iter__(self): |
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25 |
"Iterates over each point in the coordinate sequence." |
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26 |
for i in xrange(self.size): |
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yield self[i] |
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|
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def __len__(self): |
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30 |
"Returns the number of points in the coordinate sequence." |
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31 |
return int(self.size) |
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|
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def __str__(self): |
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"Returns the string representation of the coordinate sequence." |
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return str(self.tuple) |
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|
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37 |
def __getitem__(self, index): |
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38 |
"Returns the coordinate sequence value at the given index." |
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coords = [self.getX(index), self.getY(index)] |
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40 |
if self.dims == 3 and self._z: |
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41 |
coords.append(self.getZ(index)) |
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42 |
return tuple(coords) |
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|
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44 |
def __setitem__(self, index, value): |
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45 |
"Sets the coordinate sequence value at the given index." |
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46 |
# Checking the input value |
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47 |
if isinstance(value, (ListType, TupleType)): |
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48 |
pass |
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49 |
elif HAS_NUMPY and isinstance(value, ndarray): |
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pass |
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51 |
else: |
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52 |
raise TypeError('Must set coordinate with a sequence (list, tuple, or numpy array).') |
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53 |
# Checking the dims of the input |
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54 |
if self.dims == 3 and self._z: |
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55 |
n_args = 3 |
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56 |
set_3d = True |
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57 |
else: |
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58 |
n_args = 2 |
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59 |
set_3d = False |
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60 |
if len(value) != n_args: |
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61 |
raise TypeError('Dimension of value does not match.') |
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62 |
# Setting the X, Y, Z |
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63 |
self.setX(index, value[0]) |
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64 |
self.setY(index, value[1]) |
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65 |
if set_3d: self.setZ(index, value[2]) |
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66 |
|
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67 |
#### Internal Routines #### |
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68 |
def _checkindex(self, index): |
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69 |
"Checks the given index." |
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70 |
sz = self.size |
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71 |
if (sz < 1) or (index < 0) or (index >= sz): |
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72 |
raise GEOSIndexError('invalid GEOS Geometry index: %s' % str(index)) |
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73 |
|
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74 |
def _checkdim(self, dim): |
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75 |
"Checks the given dimension." |
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76 |
if dim < 0 or dim > 2: |
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77 |
raise GEOSException('invalid ordinate dimension "%d"' % dim) |
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78 |
|
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79 |
@property |
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80 |
def ptr(self): |
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81 |
""" |
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82 |
Property for controlling access to coordinate sequence pointer, |
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83 |
preventing attempted access to a NULL memory location. |
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84 |
""" |
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85 |
if self._ptr: return self._ptr |
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86 |
else: raise GEOSException('NULL coordinate sequence pointer encountered.') |
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87 |
|
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88 |
#### Ordinate getting and setting routines #### |
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89 |
def getOrdinate(self, dimension, index): |
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90 |
"Returns the value for the given dimension and index." |
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91 |
self._checkindex(index) |
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92 |
self._checkdim(dimension) |
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93 |
return cs_getordinate(self.ptr, index, dimension, byref(c_double())) |
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94 |
|
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95 |
def setOrdinate(self, dimension, index, value): |
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96 |
"Sets the value for the given dimension and index." |
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97 |
self._checkindex(index) |
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98 |
self._checkdim(dimension) |
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99 |
cs_setordinate(self.ptr, index, dimension, value) |
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100 |
|
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101 |
def getX(self, index): |
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102 |
"Get the X value at the index." |
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103 |
return self.getOrdinate(0, index) |
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104 |
|
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105 |
def setX(self, index, value): |
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106 |
"Set X with the value at the given index." |
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107 |
self.setOrdinate(0, index, value) |
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108 |
|
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109 |
def getY(self, index): |
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110 |
"Get the Y value at the given index." |
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111 |
return self.getOrdinate(1, index) |
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112 |
|
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113 |
def setY(self, index, value): |
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114 |
"Set Y with the value at the given index." |
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115 |
self.setOrdinate(1, index, value) |
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116 |
|
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117 |
def getZ(self, index): |
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118 |
"Get Z with the value at the given index." |
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119 |
return self.getOrdinate(2, index) |
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120 |
|
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121 |
def setZ(self, index, value): |
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122 |
"Set Z with the value at the given index." |
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123 |
self.setOrdinate(2, index, value) |
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124 |
|
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125 |
### Dimensions ### |
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126 |
@property |
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127 |
def size(self): |
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128 |
"Returns the size of this coordinate sequence." |
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129 |
return cs_getsize(self.ptr, byref(c_uint())) |
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130 |
|
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131 |
@property |
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132 |
def dims(self): |
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133 |
"Returns the dimensions of this coordinate sequence." |
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134 |
return cs_getdims(self.ptr, byref(c_uint())) |
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135 |
|
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136 |
@property |
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137 |
def hasz(self): |
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138 |
""" |
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139 |
Returns whether this coordinate sequence is 3D. This property value is |
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140 |
inherited from the parent Geometry. |
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141 |
""" |
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142 |
return self._z |
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143 |
|
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144 |
### Other Methods ### |
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145 |
def clone(self): |
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146 |
"Clones this coordinate sequence." |
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147 |
return GEOSCoordSeq(cs_clone(self.ptr), self.hasz) |
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|
148 |
|
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149 |
@property |
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|
150 |
def kml(self): |
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151 |
"Returns the KML representation for the coordinates." |
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152 |
# Getting the substitution string depending on whether the coordinates have |
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153 |
# a Z dimension. |
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|
154 |
if self.hasz: substr = '%s,%s,%s ' |
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155 |
else: substr = '%s,%s,0 ' |
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|
156 |
return '<coordinates>%s</coordinates>' % \ |
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|
157 |
''.join([substr % self[i] for i in xrange(len(self))]).strip() |
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|
158 |
|
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|
159 |
@property |
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|
160 |
def tuple(self): |
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|
161 |
"Returns a tuple version of this coordinate sequence." |
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|
162 |
n = self.size |
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|
163 |
if n == 1: return self[0] |
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164 |
else: return tuple([self[i] for i in xrange(n)]) |