This article describes the python Shapely Detailed Guide, a friend in need can refer
Shapely is a Python library for geometric object manipulation and analysis of the Cartesian coordinate system.
The introduction of package
from shapely.geometry import Point
from shapely.geometry import LineString
There are variables and methods
object.area
Returns the area (float) of the object.
object.bounds
返回对象的（minx,miny,maxx,maxy）元组（float类型）
object.length
返回对象的长度
object.geom_type
返回对象类型
object.distance(other)
返回本对象和另一个对象的距离
object.representative_point()
Returns a cheaply computed point that is guaranteed to be within the geometric object.
object.area
Returns the area (float) of the object.
object.bounds
返回对象的（minx,miny,maxx,maxy）元组（float类型）
object.length
返回对象的长度
object.geom_type
返回对象类型
object.distance(other)
返回本对象和另一个对象的距离
object.representative_point()
Returns a cheaply computed point that is guaranteed to be within the geometric object.
>>> from shapely.geometry import Point
>>> print Point(0,0).distance(Point(0,1))
1.0
>>> from shapely.geometry import LineString
>>> line = LineString([(0,0), (1,1), (1,2)])
>>> line.area
0.0
>>> line.bounds
(0.0, 0.0, 1.0, 2.0)
>>> line.length
2.414213562373095
>>> line.geom_type
'LineString'
Point
class Point(coordinates)
Three kinds of assignments mode
>>> point = Point(0,0)
>>> point_2 = Point((0,0))
>>> point_3 = Point(point)
Have a point object area and length of 0
>>> point.area
0.0
>>> point.length
0.0
Or may be obtained by coords coordinates x, y, z
>>> p = Point(2,3)
>>> p.coords
<shapely.coords.CoordinateSequence object at 0x7ffbc3d60dd0>
>>> list(p.coords)
[(2.0, 3.0)]
>>> p.x
2.0
>>> p.y
3.0
coords can be sliced
>>> p.coords[:]
[(2.0, 3.0)]
LineStrings
LineStrings constructor parameter is passed two or more points sequences
LineStrings a target area is zero, non-zero length
>>> line = LineString([(0,0), (0,1), (1,2)])
>>> line.area
0.0
>>> line.length
2.414213562373095
Obtain the coordinates
>>> line.coords[:]
[(0.0, 0.0), (0.0, 1.0), (1.0, 2.0)]
>>> list(line.coords)
[(0.0, 0.0), (0.0, 1.0), (1.0, 2.0)]
LineString can still accept a different type of object
>>> line2 = LineString(line)
>>> line2.coords[:]
[(0.0, 0.0), (0.0, 1.0), (1.0, 2.0)]
Common format conversion
>>> Point(1,1).wkt
'POINT (1 1)'
>>> Point(1,1).wkb
'\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf0?\x00\x00\x00\x00\x00\x00\xf0?'
>>> Point(1,1).wkb.encode('hex')
'0101000000000000000000f03f000000000000f03f'
>>>
>>> Point(1,1).wkb.encode('hex')
'0101000000000000000000f03f000000000000f03f'
Both loads and dumps method
For wkt
>>> from shapely.wkt import dumps, loads
>>> s = dumps(Point(1,2))
>>> s
'POINT (1.0000000000000000 2.0000000000000000)'
>>> ss = loads(s)
>>> ss
<shapely.geometry.point.Point object at 0x7ffbc3d783d0>
>>> ss.coords[:]
[(1.0, 2.0)]
For wkb
>>> from shapely.wkb import dumps, loads
>>> s = dumps(Point(1,2), hex=True)
>>> s
'0101000000000000000000F03F0000000000000040'
>>> ss = loads(s, hex=True)
>>> ss
<shapely.geometry.point.Point object at 0x7ffbc3d78790>
>>> ss.coords
<shapely.coords.CoordinateSequence object at 0x7ffbc3d783d0>
>>> ss.coords[:]
[(1.0, 2.0)]
Content on more than how many, and finally to recommend a good reputation in the number of public institutions [programmers], there are a lot of old-timers learning skills, learning experience, interview skills, workplace experience and other share, the more we carefully prepared the zero-based introductory information on actual project data every day to explain the timing of Python programmers technology, and share some learning methods need to pay attention to small details
