python 画风矢量图
python 画风矢量图参考
Quiver plot arrow aspect ratio
https://stackoverflow.com/questions/12079842/quiver-plot-arrow-aspect-ratio
2D quiver plot - matplotlib and MATLAB output doesnt match
https://stackoverflow.com/questions/22568256/2d-quiver-plot-matplotlib-and-matlab-output-doesnt-match
基于python的QuikScat风场数据可视化
http://bbs.06climate.com/forum.php?mod=viewthread&tid=53589
quiver(*args, data=None, **kw) method of matplotlib.axes._subplots.AxesSubplot instance
Plot a 2-D field of arrows.
Call signatures::
quiver(U, V, **kw)
quiver(U, V, C, **kw)
quiver(X, Y, U, V, **kw)
quiver(X, Y, U, V, C, **kw)
*U* and *V* are the arrow data, *X* and *Y* set the location of the arrows, and *C* sets the color of the arrows. These arguments may be 1-D or 2-D arrays or sequences.
If *X* and *Y* are absent, they will be generated as a uniform grid.
If *U* and *V* are 2-D arrays and *X* and *Y* are 1-D, and if ``len(X)`` and ``len(Y)`` match the column and row dimensions of *U*, then *X* and *Y* will be expanded with :func:`numpy.meshgrid`.
The default settings auto-scales the length of the arrows to a reasonable size.
To change this behavior see the *scale* and *scale_units* kwargs.
The defaults give a slightly swept-back arrow; to make the head a
triangle, make *headaxislength* the same as *headlength*. To make the
arrow more pointed, reduce *headwidth* or increase *headlength* and
*headaxislength*. To make the head smaller relative to the shaft,
scale down all the head parameters. You will probably do best to leave
minshaft alone.
*linewidths* and *edgecolors* can be used to customize the arrow
outlines.
Parameters
----------
X : 1D or 2D array, sequence, optional
The x coordinates of the arrow locations
Y : 1D or 2D array, sequence, optional
The y coordinates of the arrow locations
U : 1D or 2D array or masked array, sequence
The x components of the arrow vectors
V : 1D or 2D array or masked array, sequence
The y components of the arrow vectors
C : 1D or 2D array, sequence, optional
The arrow colors
units : [ 'width' | 'height' | 'dots' | 'inches' | 'x' | 'y' | 'xy' ]
The arrow dimensions (except for *length*) are measured in multiples of
this unit.
'width' or 'height': the width or height of the axis
'dots' or 'inches': pixels or inches, based on the figure dpi
'x', 'y', or 'xy': respectively *X*, *Y*, or :math:`\sqrt{X^2 + Y^2}`
in data units
The arrows scale differently depending on the units. For
'x' or 'y', the arrows get larger as one zooms in; for other
units, the arrow size is independent of the zoom state. For
'width or 'height', the arrow size increases with the width and
height of the axes, respectively, when the window is resized;
for 'dots' or 'inches', resizing does not change the arrows.
angles : [ 'uv' | 'xy' ], array, optional
Method for determining the angle of the arrows. Default is 'uv'.
'uv': the arrow axis aspect ratio is 1 so that
if *U*==*V* the orientation of the arrow on the plot is 45 degrees
counter-clockwise from the horizontal axis (positive to the right).
'xy': arrows point from (x,y) to (x+u, y+v).
Use this for plotting a gradient field, for example.
Alternatively, arbitrary angles may be specified as an array
of values in degrees, counter-clockwise from the horizontal axis.
Note: inverting a data axis will correspondingly invert the
arrows only with ``angles='xy'``.
scale : None, float, optional
Number of data units per arrow length unit, e.g., m/s per plot width; a
smaller scale parameter makes the arrow longer. Default is *None*.
If *None*, a simple autoscaling algorithm is used, based on the average
vector length and the number of vectors. The arrow length unit is given by
the *scale_units* parameter
scale_units : [ 'width' | 'height' | 'dots' | 'inches' | 'x' | 'y' | 'xy' ], None, optional
If the *scale* kwarg is *None*, the arrow length unit. Default is *None*.
e.g. *scale_units* is 'inches', *scale* is 2.0, and
``(u,v) = (1,0)``, then the vector will be 0.5 inches long.
If *scale_units* is 'width'/'height', then the vector will be half the
width/height of the axes.
If *scale_units* is 'x' then the vector will be 0.5 x-axis
units. To plot vectors in the x-y plane, with u and v having
the same units as x and y, use
``angles='xy', scale_units='xy', scale=1``.
width : scalar, optional
Shaft width in arrow units; default depends on choice of units,
above, and number of vectors; a typical starting value is about
0.005 times the width of the plot.
headwidth : scalar, optional
Head width as multiple of shaft width, default is 3
headlength : scalar, optional
Head length as multiple of shaft width, default is 5
headaxislength : scalar, optional
Head length at shaft intersection, default is 4.5
minshaft : scalar, optional
Length below which arrow scales, in units of head length. Do not
set this to less than 1, or small arrows will look terrible!
Default is 1
minlength : scalar, optional
Minimum length as a multiple of shaft width; if an arrow length
is less than this, plot a dot (hexagon) of this diameter instead.
Default is 1.
pivot : [ 'tail' | 'mid' | 'middle' | 'tip' ], optional
The part of the arrow that is at the grid point; the arrow rotates
about this point, hence the name *pivot*.
color : [ color | color sequence ], optional
This is a synonym for the
:class:`~matplotlib.collections.PolyCollection` facecolor kwarg.
If *C* has been set, *color* has no effect.
Notes
-----
Additional :class:`~matplotlib.collections.PolyCollection`
keyword arguments:
=========================================================================================== ===============================================================================================================================================
Property Description
=========================================================================================== ===============================================================================================================================================
:meth:`agg_filter ` unknown
:meth:`alpha ` float or None
:meth:`animated ` [True | False]
:meth:`antialiased ` or antialiaseds Boolean or sequence of booleans
:meth:`array ` unknown
:meth:`clim ` a length 2 sequence of floats
:meth:`clip_box ` a :class:`matplotlib.transforms.Bbox` instance
:meth:`clip_on ` [True | False]
:meth:`clip_path ` [ (:class:`~matplotlib.path.Path`, :class:`~matplotlib.transforms.Transform`) | :class:`~matplotlib.patches.Patch` | None ]
:meth:`cmap ` a colormap or registered colormap name
:meth:`color ` matplotlib color arg or sequence of rgba tuples
:meth:`contains ` a callable function
:meth:`edgecolor ` or edgecolors matplotlib color spec or sequence of specs
:meth:`facecolor ` or facecolors matplotlib color spec or sequence of specs
:meth:`figure ` a :class:`matplotlib.figure.Figure` instance
:meth:`gid ` an id string
:meth:`hatch ` [ '/' | '\\' | '|' | '-' | '+' | 'x' | 'o' | 'O' | '.' | '*' ]
:meth:`label ` string or anything printable with '%s' conversion.
:meth:`linestyle ` or dashes or linestyles ['solid' | 'dashed', 'dashdot', 'dotted' | (offset, on-off-dash-seq) | ``'-'`` | ``'--'`` | ``'-.'`` | ``':'`` | ``'None'`` | ``' '`` | ``''``]
:meth:`linewidth ` or linewidths or lw float or sequence of floats
:meth:`norm ` unknown
:meth:`offset_position ` unknown
:meth:`offsets ` float or sequence of floats
:meth:`path_effects ` unknown
:meth:`picker ` [None|float|boolean|callable]
:meth:`pickradius ` unknown
:meth:`rasterized ` [True | False | None]
:meth:`sketch_params ` unknown
:meth:`snap ` unknown
:meth:`transform ` :class:`~matplotlib.transforms.Transform` instance
:meth:`url ` a url string
:meth:`urls ` unknown
:meth:`visible ` [True | False]
:meth:`zorder ` any number
=========================================================================================== ===============================================================================================================================================
See Also
--------
quiverkey : Add a key to a quiver plot