Module grid

source code

Privide a class to allow laying ship tracks down into a grid.

Requires:

epydoc > 3.0alpha3
numpy

Author: Kurt Schwehr

Version: 8167

Status: under development

License: GPL v2

Since: 2007-Jul-29

To Do: allow for non-square grid cells

See Also: Tentative numpy tutorial

Date: 2008-01-09

Classes

[hide private]

Grid
Provide a grid data structure.

Functions

[hide private]

distance(x1, y1, x2, y2)

source code

distancePt(p1, p2)

source code

almostEqual(a, b, epsilon=1e-06)

source code

inRange(value, a, b)

source code

inBoundingBox(x, y, x0, y0, x1, y1)
x,y in within or on the bounding box

source code

wktLine2list(track)
convert a well know text line to a list of points where each point is a tuple

source code

writeMultisegline2Gnuplot(outfile, multisegLine, name=None)
Convert a multisegment line data structure to gnuplot usable line

source code

writeMultiseglineWithCrossings2Gnuplot(outfile, multisegLine, name=None, field=3)
lens [((0, 0), 0.0, 0.24874371859296396, 0.99001249960545123), ((0, 1), 0.24874371859296396, 0.5, 1.0000126258640831), ((1, 2), 0.5, 0.75125628140703049, 1.0000126258640547), ((1, 3), 0.75125628140703049, 1.0, 0.99001249960547977)]

source code

Variables

[hide private]

gridTypes = ['occurrence', 'distance', 'distanceWeightedSpeed']

e = 2.71828182846

pi = 3.14159265359

Function Details

[hide private]

wktLine2list(track)

source code

convert a well know text line to a list of points where each point is a tuple

SELECT AsText(Transform(track,32619)) FROM tpath WHERE id=33;

>>> wktLine2list("LINESTRING(376596 4674402,378419 4668775,376569 4668059)")
[(376596.0, 4674402.0), (378419.0, 4668775.0), (376569.0, 4668059.0)]

writeMultiseglineWithCrossings2Gnuplot(outfile, multisegLine, name=None, field=3)

source code

lens [((0, 0), 0.0, 0.24874371859296396, 0.99001249960545123), ((0, 1), 0.24874371859296396, 0.5, 1.0000126258640831), ((1, 2), 0.5, 0.75125628140703049, 1.0000126258640547), ((1, 3), 0.75125628140703049, 1.0, 0.99001249960547977)]

Parameters:

field - 1..3 where 3 is the distance, 1 and 2 are the fractions