OwlCyberSecurity - MANAGER
Edit File: quiver.cpython-38.pyc
U ��]�� � @ s� d Z ddlZddlZddlZddlmZ ddlmZmZm Z ddl m Z ddl mZ ddlmZ ddlmZ ddlmZ dejj ZdZG dd � d e j�Z d d � Z d d � Z G dd� dej �Z dejj Z!ejj"e!d� G dd� dej �Z#dS )a� Support for plotting vector fields. Presently this contains Quiver and Barb. Quiver plots an arrow in the direction of the vector, with the size of the arrow related to the magnitude of the vector. Barbs are like quiver in that they point along a vector, but the magnitude of the vector is given schematically by the presence of barbs or flags on the barb. This will also become a home for things such as standard deviation ellipses, which can and will be derived very easily from the Quiver code. � N)�ma)�cbook� docstring� font_manager)� CirclePolygonaT Plot a 2D field of arrows. Call signature:: quiver([X, Y], U, V, [C], **kw) Where *X*, *Y* define the arrow locations, *U*, *V* define the arrow directions, and *C* optionally sets the color. **Arrow size** The default settings auto-scales the length of the arrows to a reasonable size. To change this behavior see the *scale* and *scale_units* parameters. **Arrow shape** 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. **Arrow outline** *linewidths* and *edgecolors* can be used to customize the arrow outlines. Parameters ---------- X, Y : 1D or 2D array-like, optional The x and y coordinates of the arrow locations. If not given, they will be generated as a uniform integer meshgrid based on the dimensions of *U* and *V*. If *X* and *Y* are 1D but *U*, *V* are 2D, *X*, *Y* are expanded to 2D using ``X, Y = np.meshgrid(X, Y)``. In this case ``len(X)`` and ``len(Y)`` must match the column and row dimensions of *U* and *V*. U, V : 1D or 2D array-like The x and y direction components of the arrow vectors. C : 1D or 2D array-like, optional Numeric data that defines the arrow colors by colormapping via *norm* and *cmap*. This does not support explicit colors. If you want to set colors directly, use *color* instead. units : {'width', 'height', 'dots', 'inches', 'x', 'y' 'xy'}, default: 'width' The arrow dimensions (except for *length*) are measured in multiples of this unit. The following values are supported: - 'width', 'height': The width or height of the axis. - 'dots', 'inches': Pixels or inches based on the figure dpi. - 'x', 'y', 'xy': *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'} or array-like, optional, default: 'uv' Method for determining the angle of the arrows. - '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). Use this if the arrows symbolize a quantity that is not based on *X*, *Y* data coordinates. - '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 explicitly as an array of values in degrees, counter-clockwise from the horizontal axis. In this case *U*, *V* is only used to determine the length of the arrows. Note: inverting a data axis will correspondingly invert the arrows only with ``angles='xy'``. scale : 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'}, 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' or '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 : float, 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 : float, optional, default: 3 Head width as multiple of shaft width. headlength : float, optional, default: 5 Head length as multiple of shaft width. headaxislength : float, optional, default: 4.5 Head length at shaft intersection. minshaft : float, optional, default: 1 Length below which arrow scales, in units of head length. Do not set this to less than 1, or small arrows will look terrible! minlength : float, optional, default: 1 Minimum length as a multiple of shaft width; if an arrow length is less than this, plot a dot (hexagon) of this diameter instead. pivot : {'tail', 'mid', 'middle', 'tip'}, optional, default: 'tail' The part of the arrow that is anchored to the *X*, *Y* grid. The arrow rotates about this point. 'mid' is a synonym for 'middle'. color : color or color sequence, optional Explicit color(s) for the arrows. If *C* has been set, *color* has no effect. This is a synonym for the `~.PolyCollection` *facecolor* parameter. Other Parameters ---------------- **kwargs : `~matplotlib.collections.PolyCollection` properties, optional All other keyword arguments are passed on to `.PolyCollection`: %(PolyCollection)s See Also -------- quiverkey : Add a key to a quiver plot. ae Add a key to a quiver plot. Call signature:: quiverkey(Q, X, Y, U, label, **kw) Arguments: *Q*: The Quiver instance returned by a call to quiver. *X*, *Y*: The location of the key; additional explanation follows. *U*: The length of the key *label*: A string with the length and units of the key Keyword arguments: *angle* = 0 The angle of the key arrow. Measured in degrees anti-clockwise from the x-axis. *coordinates* = [ 'axes' | 'figure' | 'data' | 'inches' ] Coordinate system and units for *X*, *Y*: 'axes' and 'figure' are normalized coordinate systems with 0,0 in the lower left and 1,1 in the upper right; 'data' are the axes data coordinates (used for the locations of the vectors in the quiver plot itself); 'inches' is position in the figure in inches, with 0,0 at the lower left corner. *color*: overrides face and edge colors from *Q*. *labelpos* = [ 'N' | 'S' | 'E' | 'W' ] Position the label above, below, to the right, to the left of the arrow, respectively. *labelsep*: Distance in inches between the arrow and the label. Default is 0.1 *labelcolor*: defaults to default :class:`~matplotlib.text.Text` color. *fontproperties*: A dictionary with keyword arguments accepted by the :class:`~matplotlib.font_manager.FontProperties` initializer: *family*, *style*, *variant*, *size*, *weight* Any additional keyword arguments are used to override vector properties taken from *Q*. The positioning of the key depends on *X*, *Y*, *coordinates*, and *labelpos*. If *labelpos* is 'N' or 'S', *X*, *Y* give the position of the middle of the key arrow. If *labelpos* is 'E', *X*, *Y* positions the head, and if *labelpos* is 'W', *X*, *Y* positions the tail; in either of these two cases, *X*, *Y* is somewhere in the middle of the arrow+label key object. c @ s� e Zd ZdZddddd�Zddddd�Zddd d d�Zd d d ddd d d�dd�Zdd� Ze e_dd� Z dd� Z dd� Z e jdd � �Zd d � Zd d � Zd!d"� Ze Zd S )#� QuiverKeyz3 Labelled arrow for use as a quiver plot scale key.�center�left�right)�N�S�E�WZbottom�top�middle�tip�tailr �axesN皙�����?r )�angle� coordinates�color�labelsep�labelpos� labelcolor�fontpropertiesc s� t j�| � || _|| _|| _|| _|| _|| _|| _ || _ | | _ | j |j j j | _t�| �� � fdd�}|j j j�d|�| _| | _| | _| p�t� | _| | _| j}tj|| j | j | j | j t j f |�d�| _ | jd k r�| j �!| j� d| _"|j#d | _#d S )Nc s& � � }|d k r"|j | j |_d|_d S �NF)�_labelsep_inches�dpir � _initialized��figZ self_weakref�Z weak_self� �3/usr/lib/python3/dist-packages/matplotlib/quiver.py� on_dpi_change s z)QuiverKey.__init__.<locals>.on_dpi_change� dpi_changed)�textZhorizontalalignmentZverticalalignmentr Fr )$�martist�Artist�__init__�Q�X�Y�Ur �coordr �labelr �ax�figurer r �weakref�ref� callbacks�connect�_cidr r �dictr �kw�mtextZText�halign�valignr ZFontPropertiesr' � set_colorr Zzorder)�selfr+ r, r- r. r0 r r r r r r r r9 r% Z_fpr# r" r$ r* s> � � zQuiverKey.__init__c C s* | j jjj�| j� d| _tj�| � dS �z, Overload the remove method N) r+ r1 r2 r5 � disconnectr7 r( r) �remove�r> r# r# r$ rA 5 s zQuiverKey.removec C sD | j js| j �� | �� | j j}| j| j | j _| j j}tj| j _| j t � t � | j �� }| j t �t � | j �� }t| j jt�r�| j jnd}| j �t �|g�t �|g�|�| _|| j _|| j _| j j}|�| j� tj| jf| j| jfg| � � d�|��| _ | j d k �r| j � | j � | j � | j � � � | j �!| �"� � d| _d S )N�uv��offsets� transOffsetT)#r+ r �_init�_set_transform�pivotr �Umaskr �nomaskr. �np�cosZradiansr �sin� isinstance�angles�str� _make_verts�array�verts�polykw�updater9 � mcollections�PolyCollectionr, r- � get_transform�vectorr r= � set_transform� set_figureZ get_figure)r> �_pivotZ_mask�u�vr r9 r# r# r$ rG @ s@ � � �� zQuiverKey._initc C s0 | j dkr|| j S | j dkr(|| j S |S d S )Nr r �r r )r> �xr# r# r$ �_text_x^ s zQuiverKey._text_xc C s0 | j dkr|| j S | j dkr(|| j S |S d S )Nr r r` )r> �yr# r# r$ �_text_yf s zQuiverKey._text_yc C sh | � � | j�|� | �� �| j| jf�\}}| j�| � |�� | j� | � |�� | j�|� d| _ d S r ) rG rZ �drawrY �transform_pointr, r- r' Zset_xrb Zset_yrd �stale)r> �rendererra rc r# r# r$ re n s zQuiverKey.drawc C s� | j dkr | �| jjj� n`| j dkr8| �| jjj� nD| j dkrV| �| jjjj� n&| j dkrt| �| jjjj� nt d��d S )N�datar r2 �incheszunrecognized coordinates) r/ r[ r+ r1 � transDataZ transAxesr2 Z transFigureZdpi_scale_trans� ValueErrorrB r# r# r$ rH x s zQuiverKey._set_transformc C s t j�| |� | j�|� d S �N)r( r) r\ r' )r> r! r# r# r$ r\ � s zQuiverKey.set_figurec C s0 | j �|�d s | j�|�d r(di fS di fS )Nr TF)r' �containsrZ )r> Z mouseeventr# r# r$ rn � s �zQuiverKey.contains)�__name__� __module__� __qualname__�__doc__r; r< rI r* rA �_quiverkey_docrG rb rd r( �allow_rasterizationre rH r\ rn Z quiverkey_docr# r# r# r$ r � s. � 0 r c G s$ d } } } }}t | �} t| �dks4t| �dkrDt�| �d��}t�| �d��}t�| �d��}tj|||d� |jdkr�d|jd }}n |j\}}t| �dkr�dd � | D �\}}t|�|kr�t|�|kr�d d � t� ||�D �\}}n*t� t� |�t� |��}d d � |D �\}}|||||fS ) N� � ���)r. �V�C� r � c S s g | ]}t �|��� �qS r# )rL rS �ravel��.0�ar# r# r$ � <listcomp>� s z _parse_args.<locals>.<listcomp>c S s g | ] }|� � �qS r# )r| r} r# r# r$ r� � s c S s g | ]}t �|��qS r# )rL r| r} r# r# r$ r� � s ) �list�lenrL � atleast_1d�popr Z_check_not_matrix�ndim�shapeZmeshgrid�arange) �argsr, r- r. rx ry ZnrZncZ indexgridr# r# r$ � _parse_args� s" r� c G s& dd� | D �}t |�dkr"td��d S )Nc S s h | ] }|j �qS r# )r� r} r# r# r$ � <setcomp>� s z+_check_consistent_shapes.<locals>.<setcomp>rz z/The shapes of the passed in arrays do not match)r� rl )ZarraysZ all_shapesr# r# r$ �_check_consistent_shapes� s r� c @ s� e Zd ZdZdZe�e�ddddddddd dd d d � d d��Ze j ddd�e dd� ��Z e � d�e dd� ��Z e � d�e dd� ��Zdd� Zdd� Zd d � Zejd d � �Zd,d d!�Zd"d#� Zd$d%� Zd-d&d'�Zd(d)� Zd*d+� ZeZdS ).�Quiverar Specialized PolyCollection for arrows. The only API method is set_UVC(), which can be used to change the size, orientation, and color of the arrows; their locations are fixed when the class is instantiated. Possibly this method will be useful in animations. Much of the work in this class is done in the draw() method so that as much information as possible is available about the plot. In subsequent draw() calls, recalculation is limited to things that might have changed, so there should be no performance penalty from putting the calculations in the draw() method. )r r r Nru rv g @rz �widthrC �kr ) �scale� headwidth� headlength�headaxislength�minshaft� minlength�units� scale_unitsrP r� r rI c s< || _ t|� \}}}}}|| _|| _t�||f�| _t|�| _|| _ || _ t |�| _ || _ || _|| _|| _| | _| | _| | _| �� dkr�d} | �� | _tj| j| jd� |�d|j�| _|� d| � |� dd� t j j | g f| j| jdd �|�� || _ | �!|||� d| _"t#�$| �� � fd d �}| j j%j&�'d |�| _(d S )z� The constructor takes one required argument, an Axes instance, followed by the args and kwargs described by the following pyplot interface documentation: %s Zmidr )rI � transform� facecolorsZ linewidths)r F)rE rF �closedc s � � }|d k rd|_ d|_d S )NTF)�_new_UVr r r" r# r$ r% � s z&Quiver.__init__.<locals>.on_dpi_changer& N))r1 r� r, r- rL � column_stack�XYr� r r� r� �floatr� r� r� r� r� r� rP r� �lowerrI r Z_check_in_list� _PIVOT_VALSr� rk r� � setdefaultrW rX r* rU �set_UVCr r3 r4 r2 r5 r6 r7 )r> r1 r� r� r� r� r� r� r� r� rP r� r rI r� r9 r, r- r. rx ry r% r# r" r$ r* � sJ �� �zQuiver.__init__z3.1zget_facecolor())Z alternativec C s | � � S rm )Z get_facecolorrB r# r# r$ r s z Quiver.colorc C s d S rm r# rB r# r# r$ �keyvec s z Quiver.keyvecc C s d S rm r# rB r# r# r$ �keytext s zQuiver.keytextc C s( | j jj�| j� d| _tj�| � dS r? )r1 r2 r5 r@ r7 rW rX rA rB r# r# r$ rA s z Quiver.removec C s� | � � }| j}|�� �|jj|jjf�\}}|| _| jdkrbt� t � | j �dd�}d| j | | _| j s�| jdkr�| �| j| j| j� d| _ dS )z] Initialization delayed until first draw; allow time for axes setup. N� � g� ��Q��?T)rH r1 �invertedrf �bboxr� �height�spanrL �clip�math�sqrtr r r� rR r. rx rP )r> �transr1 ZsxZsy�snr# r# r$ rG s � z Quiver._initc C sH | � � }| �� }|| || }|�| j�}tj�� }|j|dd� |S )NT)�ignore)rY Zget_offset_transformr� r� � transformsZBboxZnullZupdate_from_data_xy)r> rk r� rF Zfull_transformr� r� r# r# r$ � get_datalim5 s zQuiver.get_datalimc C sH | � � | �| j| j| j�}| j|dd� d| _tj� | |� d| _ d S )NF)r� ) rG rR r. rx rP � set_vertsr� rW rX re rg )r> rh rT r# r# r$ re > s z Quiver.drawc C s� t j|dd��� }t j|dd��� }t j|j|jddd�}|d k r�t j|dd��� }t j||jddd�}|t jkr||�� }nt j||dd�}|�d�| _|�d�| _ || _ |d k r�| � |� d| _ d| _ d S )NT��copyF)r� �shrink)�maskr� rz )r �masked_invalidr| Zmask_orr� rK �filledrS r. rx rJ � set_arrayr� rg )r> r. rx ry r� r# r# r$ r� G s zQuiver.set_UVCc C s� | j }|dkr�|dkr(|jj}|jj}nR|dkrB|jj}|jj}n8|jj}|jj}|jj}|jj}t�||�}t�||�}|| } nL|dkr�|jj} n:|dkr�|jj} n(|dkr�d} n|dkr�|jj} nt d ��| S ) zK Return a scale factor for converting from units to pixels )ra rc �xyra rc r� r� Zdots� �?rj zunrecognized units) r1 ZviewLimr� r� r� rL �hypotr2 r rl ) r> r� r1 Zdx0Zdx1Zdxx0Zdxx1Zdyy0Zdyy1�dxr# r# r$ �_dots_per_unit\ s2 zQuiver._dots_per_unitc C s. | � | j�}|| _t�� �|�}| �|� |S )zf Sets the PolygonCollection transform to go from arrow width units to pixels. )r� r� � _trans_scaler� �Affine2Dr� r[ )r> r� r� r# r# r$ rH } s zQuiver._set_transformc C sz | j j�| j�}t�||f�}| j j�| j|| �}|| }t�|d d �df |d d �df �}tj|j� | } || fS )Nrz r ) r1 rk r� r� rL r� �arctan2r� �T) r> r. rx �epsr� rC ZxypZdxyrP �lengthsr# r# r$ �_angles_lengths� s $zQuiver._angles_lengthsc C s ||d }t |t�r|nd}|dkrF| jdkrF| j||dd�\}}n>|dksX| jdkr�t�| jjj�� � d }| j|||d�\}}|r�| jdkr�|}n t�|�}| j d kr�t dt � | j ��} | jtjk r�|| j �� } n|�� } d| | | j } | jd k�r| j d k�r| | _ d } n>| jdk�r,d} n | �| j�} | | j } | j d k�rX| | | _ || | j | j }| �|�\}}|dk�r�|}n,|d k�r�t�|�}nt�t�|���d �}|�d �}||d t� d| � | j }tj |j |j fd d�}| jtjk �rt� |�}tj!|| j< |S )Ny �?� r� rz )r� g����MbP?� g������?r� rC r )rw rz r{ �Zaxis)"rO rQ r� r� rL �absr1 ZdataLimZextents�maxr� r� r� r rJ r rK Zmeanr� r� r� r� � _h_arrowsr r� Zdeg2radr� �reshapeZexp�stack�real�imagrS Zmasked)r> r. rx rP rC Z str_anglesr� r� r r� Zameanr� Zwidthu_per_lenur� �lengthr, r- Zthetar� r� r# r# r$ rR � sP zQuiver._make_vertsc C s | j | j }t|�}|�|d�}tj|dd|d� t�d| j | j dgtj�}|t�ddddg�| }dt�dd| j dgtj� }tj |tj dd�f |dd�}t�d|| j || j |gtj�}dt�dd| j dgtj� }dddd ddddg}|dd�|f } |dd�|f } | dd�d d �f d 9 < || } || } | d d � d 9 < |d k�rh|| nd } | | tj dd�f } | | tj dd�f } tj ||k d dd�}tj | | |d � tj | | |d � | j dk�r�| d| dd�d tj f 8 } nB| j dk�r | | dd�d tj f } n | j dk�r8td�| j ���|| jk }|�� �r�t�dd dtj�tjd }t�|�| j d }t�|�| j d }tj |tj dd�f |dd�}tj |tj dd�f |dd�}t� |d d�}tj | ||d � tj | ||d � | | fS )z length is in arrow width units rz r i )�out� �?Nr� r{ ru rw � r� )�wherer r r zCQuiver.pivot must have value in {{'middle', 'tip', 'tail'}} not {0}g @)r� r� r� r� rL r� rS r� Zfloat64r� �repeatZnewaxisZcopytorI rl �formatr� �anyr� �pirM rN )r> r� Zminshr ra rc Zx0Zy0Ziir, r- ZX0ZY0r� ZshortZtooshortZthZx1Zy1ZX1ZY1r# r# r$ r� � sh �� �� � zQuiver._h_arrows)N)rz ) ro rp rq rr r� r Z Substitution� _quiver_docr* r Z deprecated�propertyr r� r� rA rG r� r( rt re r� r� rH r� rR r� Z quiver_docr# r# r# r$ r� � sJ �; ! :=r� a� Plot a 2D field of barbs. Call signature:: barbs([X, Y], U, V, [C], **kw) Where *X*, *Y* define the barb locations, *U*, *V* define the barb directions, and *C* optionally sets the color. All arguments may be 1D or 2D. *U*, *V*, *C* may be masked arrays, but masked *X*, *Y* are not supported at present. Barbs are traditionally used in meteorology as a way to plot the speed and direction of wind observations, but can technically be used to plot any two dimensional vector quantity. As opposed to arrows, which give vector magnitude by the length of the arrow, the barbs give more quantitative information about the vector magnitude by putting slanted lines or a triangle for various increments in magnitude, as show schematically below:: : /\ \ : / \ \ : / \ \ \ : / \ \ \ : ------------------------------ The largest increment is given by a triangle (or "flag"). After those come full lines (barbs). The smallest increment is a half line. There is only, of course, ever at most 1 half line. If the magnitude is small and only needs a single half-line and no full lines or triangles, the half-line is offset from the end of the barb so that it can be easily distinguished from barbs with a single full line. The magnitude for the barb shown above would nominally be 65, using the standard increments of 50, 10, and 5. See also https://en.wikipedia.org/wiki/Wind_barb. Parameters ---------- X, Y : 1D or 2D array-like, optional The x and y coordinates of the barb locations. See *pivot* for how the barbs are drawn to the x, y positions. If not given, they will be generated as a uniform integer meshgrid based on the dimensions of *U* and *V*. If *X* and *Y* are 1D but *U*, *V* are 2D, *X*, *Y* are expanded to 2D using ``X, Y = np.meshgrid(X, Y)``. In this case ``len(X)`` and ``len(Y)`` must match the column and row dimensions of *U* and *V*. U, V : 1D or 2D array-like The x and y components of the barb shaft. C : 1D or 2D array-like, optional Numeric data that defines the barb colors by colormapping via *norm* and *cmap*. This does not support explicit colors. If you want to set colors directly, use *barbcolor* instead. length : float, default: 7 Length of the barb in points; the other parts of the barb are scaled against this. pivot : {'tip', 'middle'} or float, default: 'tip' The part of the arrow that is anchored to the *X*, *Y* grid. The barb rotates about this point. This can also be a number, which shifts the start of the barb that many points away from grid point. barbcolor : color or color sequence Specifies the color of all parts of the barb except for the flags. This parameter is analogous to the *edgecolor* parameter for polygons, which can be used instead. However this parameter will override facecolor. flagcolor : color or color sequence Specifies the color of any flags on the barb. This parameter is analogous to the *facecolor* parameter for polygons, which can be used instead. However, this parameter will override facecolor. If this is not set (and *C* has not either) then *flagcolor* will be set to match *barbcolor* so that the barb has a uniform color. If *C* has been set, *flagcolor* has no effect. sizes : dict, optional A dictionary of coefficients specifying the ratio of a given feature to the length of the barb. Only those values one wishes to override need to be included. These features include: - 'spacing' - space between features (flags, full/half barbs) - 'height' - height (distance from shaft to top) of a flag or full barb - 'width' - width of a flag, twice the width of a full barb - 'emptybarb' - radius of the circle used for low magnitudes fill_empty : bool, default: False Whether the empty barbs (circles) that are drawn should be filled with the flag color. If they are not filled, the center is transparent. rounding : bool, default: True Whether the vector magnitude should be rounded when allocating barb components. If True, the magnitude is rounded to the nearest multiple of the half-barb increment. If False, the magnitude is simply truncated to the next lowest multiple. barb_increments : dict, optional A dictionary of increments specifying values to associate with different parts of the barb. Only those values one wishes to override need to be included. - 'half' - half barbs (Default is 5) - 'full' - full barbs (Default is 10) - 'flag' - flags (default is 50) flip_barb : bool or array-like of bool, default: False Whether the lines and flags should point opposite to normal. Normal behavior is for the barbs and lines to point right (comes from wind barbs having these features point towards low pressure in the Northern Hemisphere). A single value is applied to all barbs. Individual barbs can be flipped by passing a bool array of the same size as *U* and *V*. Returns ------- barbs : `~matplotlib.quiver.Barbs` Other Parameters ---------------- **kwargs The barbs can further be customized using `.PolyCollection` keyword arguments: %(PolyCollection)s )� barbs_docc @ s\ e Zd ZdZejdddddddddd� dd ��Zdd d�Zdd� Zddd�Z dd� Z e Z dS )�Barbsa> Specialized PolyCollection for barbs. The only API method is :meth:`set_UVC`, which can be used to change the size, orientation, and color of the arrows. Locations are changed using the :meth:`set_offsets` collection method. Possibly this method will be useful in animations. There is one internal function :meth:`_find_tails` which finds exactly what should be put on the barb given the vector magnitude. From there :meth:`_make_barbs` is used to find the vertices of the polygon to represent the barb based on this information. r � NFT) rI r� � barbcolor� flagcolor�sizes� fill_empty�barb_increments�rounding� flip_barbc O s2 |pt � | _|| _|pt � | _| | _t�| �| _| �d|j �} || _ || _ |}|}d||fkr�d| d< |rt|| d< q�|r�|| d< q�| � dd� n|| d< || d< d| kr�d| kr�d | d< t | � \}}}}}|| _|| _t�||f�}| j d d }tjj| g |ff|| d �| �� | �t�� � | �|||� dS ) z� The constructor takes one required argument, an Axes instance, followed by the args and kwargs described by the following pyplot interface documentation: %(barbs_doc)s r� NZfaceZ edgecolorsr� r� Z linewidthZlwrz r{ � rD )r8 r� r� r� r� rL r� �flipr� rk r] �_lengthr� r� ra rc r� rW rX r* r[ r� ZIdentityTransformr� )r> r1 rI r� r� r� r� r� r� r� r� r� r9 r� ra rc r^ r_ �cr� Z barb_sizer# r# r$ r* � sD ��zBarbs.__init__rv r� �2 c C s| |r||| d � t� }t�|| �� t�}|| }t�|| �� t�}|| }||k}||dkB |dkB } |||| fS )aZ Find how many of each of the tail pieces is necessary. Flag specifies the increment for a flag, barb for a full barb, and half for half a barb. Mag should be the magnitude of a vector (i.e., >= 0). This returns a tuple of: (*number of flags*, *number of barbs*, *half_flag*, *empty_flag*) *half_flag* is a boolean whether half of a barb is needed, since there should only ever be one half on a given barb. *empty_flag* flag is an array of flags to easily tell if a barb is empty (too low to plot any barbs/flags. r� r )Zastype�intrL Zfloor) r> Zmagr� ZhalfZfull�flagZ num_flagsZnum_barbZ half_flag� empty_flagr# r# r$ � _find_tails� s zBarbs._find_tailsc C sj || � dd� } || � dd� } || � dd� }|| � dd� }td | d d �}d }z t|�}W n tk r� ||�� }Y nX t�||�tjd }t d |d�� � }| r�|}nt� ||ddd� f�}g }t� |�D �]�\}}|| r�|� |� q�||fg}|}| | �r| n| }t|| �D ]`} ||k�rB|| d 7 }|�||| g|| ||d | g||| | gg� ||| 8 }�q(t|| �D ]B} |�||| f|| || |d f||| fg� || 8 }�q�|| �rD||k�r |� ||| f� |d| 8 }|�||| f||d || |d f||| fg� t�� �| ��|�}|� |� q�|S )a� This function actually creates the wind barbs. *u* and *v* are components of the vector in the *x* and *y* directions, respectively. *nflags*, *nbarbs*, and *half_barb*, empty_flag* are, *respectively, the number of flags, number of barbs, flag for *half a barb, and flag for empty barb, ostensibly obtained *from :meth:`_find_tails`. *length* is the length of the barb staff in points. *pivot* specifies the point on the barb around which the entire barb should be rotated. Right now, valid options are 'tip' and 'middle'. Can also be a number, which shifts the start of the barb that many points from the origin. *sizes* is a dictionary of coefficients specifying the ratio of a given feature to the length of the barb. These features include: - *spacing*: space between features (flags, full/half barbs) - *height*: distance from shaft of top of a flag or full barb - *width* - width of a flag, twice the width of a full barb - *emptybarb* - radius of the circle used for low magnitudes *fill_empty* specifies whether the circle representing an empty barb should be filled or not (this changes the drawing of the polygon). *flip* is a flag indicating whether the features should be flipped to the other side of the barb (useful for winds in the southern hemisphere). This function returns list of arrays of vertices, defining a polygon for each of the wind barbs. These polygons have been rotated to properly align with the vector direction. �spacingg �?r� g�������?r� g �?Z emptybarbg333333�?r� g @)r r r{ )r r )ZradiusNrw g �?r� )�getr8 r� rl r� r r� rL r� r Z get_vertsZ concatenateZ ndenumerate�append�range�extendr� r� �rotater� ) r> r^ r_ ZnflagsZnbarbsZ half_barbr� r� rI r� r� r� r� Z full_heightZ full_widthZ empty_radZ pivot_pointsZendxZendyrP ZcircZ empty_barbZ barb_list�indexr Z poly_verts�offsetZ barb_height�ir# r# r$ � _make_barbs sp 1 �� �� ��� zBarbs._make_barbsc C s| t j|dd��� | _t j|dd��� | _t| j�dkrJt�| j| jj �}n| j}|d k r�t j|dd��� }t � | j �� | j �� | j| j||�� �\}}}} }}t|||| ||� n@t � | j �� | j �� | j| j|�� �\}}}} }t|||| |� t�|| �} | j| | jf| j�\} } } }| �|| | | | || j| j| j| j|� }| �|� |d k �r^| �|� t�||f�}|| _d| _ d S )NFr� rz T) r r� r| r^ r_ r� r� rL Z broadcast_tor� r �delete_masked_pointsra rc r� r� r� r� r� r� r� r] r� r� r� r� r� Z_offsetsrg )r> r. rx ry r� r� ra rc r^ r_ Z magnitude�flagsZbarbsZhalves�emptyZ plot_barbsr� r# r# r$ r� � sV � � �� � z Barbs.set_UVCc C s� |dd�df | _ |dd�df | _t�| j �� | j�� | j| j�\}}}}t||||� t� ||f�}t j � | |� d| _ dS )z� Set the offsets for the barb polygons. This saves the offsets passed in and masks them as appropriate for the existing U/V data. Parameters ---------- xy : sequence of pairs of floats Nr rz T)ra rc r r� r| r^ r_ r� rL r� rW rX � set_offsetsrg )r> r� ra rc r^ r_ r# r# r$ r� � s � zBarbs.set_offsets)Trv r� r� )N) ro rp rq rr r �interpdr* r� r� r� r� � _barbs_docr� r# r# r# r$ r� � s$ �; ,r� )$rr r� r3 ZnumpyrL r Z matplotlibr r r Zmatplotlib.artistZartistr( Zmatplotlib.collections� collectionsrW Zmatplotlib.patchesr Zmatplotlib.textr' r: Zmatplotlib.transformsr� r� Zparamsr� rs r) r r� r� rX r� r� rV r� r# r# r# r$ �<module> s@ � � B X � �