napari.view_layers

Methods to create a new viewer instance and add a particular layer type.

This module autogenerates a number of convenience functions, such as “view_image”, or “view_surface”, that both instantiate a new viewer instance, and add a new layer of a specific type to the viewer. Each convenience function signature is a merged version of one of the Viewer.__init__ method and the Viewer.add_<layer_type> methods. The final generated functions follow this pattern (where <layer_type> is replaced with one of the layer types):

def view_<layer_type>(*args, **kwargs):

# pop all of the viewer kwargs out of kwargs into viewer_kwargs viewer = Viewer(**viewer_kwargs) add_method = getattr(viewer, f”add_{<layer_type>}”) add_method(*args, **kwargs) return viewer

Note however: the real function signatures and documentation are maintained in the final functions, along with introspection, and tab autocompletion, etc…

Classes

NumpyDocString	Parses a numpydoc string to an abstract representation
Viewer	Napari ndarray viewer.

Functions

napari.view_layers.merge_docs(add_method, layer_string)

napari.view_layers.view_image(data=None, *, channel_axis=None, rgb=None, colormap=None, contrast_limits=None, gamma=1, interpolation='nearest', rendering='mip', iso_threshold=0.5, attenuation=0.05, name=None, metadata=None, scale=None, translate=None, rotate=None, shear=None, affine=None, opacity=1, blending=None, visible=True, multiscale=None, title='napari', ndisplay=2, order=(), axis_labels=(), show=True)

Create a viewer and add an image layer.

Parameters

• data (array or list of array) – Image data. Can be N dimensional. If the last dimension has length 3 or 4 can be interpreted as RGB or RGBA if rgb is True. If a list and arrays are decreasing in shape then the data is treated as a multiscale image.

• channel_axis (int, optional) – Axis to expand image along. If provided, each channel in the data will be added as an individual image layer. In channel_axis mode, all other parameters MAY be provided as lists, and the Nth value will be applied to the Nth channel in the data. If a single value is provided, it will be broadcast to all Layers.

• rgb (bool or list) – Whether the image is rgb RGB or RGBA. If not specified by user and the last dimension of the data has length 3 or 4 it will be set as True. If False the image is interpreted as a luminance image. If a list then must be same length as the axis that is being expanded as channels.

• colormap (str, napari.utils.Colormap, tuple, dict, list) – Colormaps to use for luminance images. If a string must be the name of a supported colormap from vispy or matplotlib. If a tuple the first value must be a string to assign as a name to a colormap and the second item must be a Colormap. If a dict the key must be a string to assign as a name to a colormap and the value must be a Colormap. If a list then must be same length as the axis that is being expanded as channels, and each colormap is applied to each new image layer.

• contrast_limits (list (2,)) – Color limits to be used for determining the colormap bounds for luminance images. If not passed is calculated as the min and max of the image. If list of lists then must be same length as the axis that is being expanded and then each colormap is applied to each image.

• gamma (list, float) – Gamma correction for determining colormap linearity. Defaults to 1. If a list then must be same length as the axis that is being expanded as channels.

• interpolation (str or list) – Interpolation mode used by vispy. Must be one of our supported modes. If a list then must be same length as the axis that is being expanded as channels.

• rendering (str or list) – Rendering mode used by vispy. Must be one of our supported modes. If a list then must be same length as the axis that is being expanded as channels.

• iso_threshold (float or list) – Threshold for isosurface. If a list then must be same length as the axis that is being expanded as channels.

• attenuation (float or list) – Attenuation rate for attenuated maximum intensity projection. If a list then must be same length as the axis that is being expanded as channels.

• name (str or list of str) – Name of the layer. If a list then must be same length as the axis that is being expanded as channels.

• metadata (dict or list of dict) – Layer metadata. If a list then must be a list of dicts with the same length as the axis that is being expanded as channels.

• scale (tuple of float or list) – Scale factors for the layer. If a list then must be a list of tuples of float with the same length as the axis that is being expanded as channels.

• translate (tuple of float or list) – Translation values for the layer. If a list then must be a list of tuples of float with the same length as the axis that is being expanded as channels.

• rotate (float, 3-tuple of float, n-D array or list.) – If a float convert into a 2D rotation matrix using that value as an angle. If 3-tuple convert into a 3D rotation matrix, using a yaw, pitch, roll convention. Otherwise assume an nD rotation. Angles are assumed to be in degrees. They can be converted from radians with np.degrees if needed. If a list then must have same length as the axis that is being expanded as channels.

• shear (1-D array or list.) – A vector of shear values for an upper triangular n-D shear matrix. If a list then must have same length as the axis that is being expanded as channels.

• affine (n-D array or napari.utils.transforms.Affine) – (N+1, N+1) affine transformation matrix in homogeneous coordinates. The first (N, N) entries correspond to a linear transform and the final column is a lenght N translation vector and a 1 or a napari AffineTransform object. If provided then translate, scale, rotate, and shear values are ignored.

• opacity (float or list) – Opacity of the layer visual, between 0.0 and 1.0. If a list then must be same length as the axis that is being expanded as channels.

• blending (str or list) – One of a list of preset blending modes that determines how RGB and alpha values of the layer visual get mixed. Allowed values are {‘opaque’, ‘translucent’, and ‘additive’}. If a list then must be same length as the axis that is being expanded as channels.

• visible (bool or list of bool) – Whether the layer visual is currently being displayed. If a list then must be same length as the axis that is being expanded as channels.

• multiscale (bool) – Whether the data is a multiscale image or not. Multiscale data is represented by a list of array like image data. If not specified by the user and if the data is a list of arrays that decrease in shape then it will be taken to be multiscale. The first image in the list should be the largest.

• title (string, optional) – The title of the viewer window. by default ‘napari’.

• ndisplay ({2, 3}, optional) – Number of displayed dimensions. by default 2.

• order (tuple of int, optional) – Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

• axis_labels (list of str, optional) – Dimension names. by default they are labeled with sequential numbers

• show (bool, optional) – Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer

napari.view_layers.view_labels(data, *, num_colors=50, properties=None, color=None, seed=0.5, name=None, metadata=None, scale=None, translate=None, rotate=None, shear=None, affine=None, opacity=0.7, blending='translucent', visible=True, multiscale=None, title='napari', ndisplay=2, order=(), axis_labels=(), show=True)

Create a viewer and add a labels layer.

Parameters

• data (array or list of array) – Labels data as an array or multiscale.

• num_colors (int) – Number of unique colors to use in colormap.

• properties (dict {str: array (N,)}, DataFrame) – Properties for each label. Each property should be an array of length N, where N is the number of labels, and the first property corresponds to background.

• color (dict of int to str or array) – Custom label to color mapping. Values must be valid color names or RGBA arrays.

• seed (float) – Seed for colormap random generator.

• name (str) – Name of the layer.

• metadata (dict) – Layer metadata.

• scale (tuple of float) – Scale factors for the layer.

• translate (tuple of float) – Translation values for the layer.

• rotate (float, 3-tuple of float, or n-D array.) – If a float convert into a 2D rotation matrix using that value as an angle. If 3-tuple convert into a 3D rotation matrix, using a yaw, pitch, roll convention. Otherwise assume an nD rotation. Angles are assumed to be in degrees. They can be converted from radians with np.degrees if needed.

• shear (1-D array or n-D array) – Either a vector of upper triangular values, or an nD shear matrix with ones along the main diagonal.

• affine (n-D array or napari.utils.transforms.Affine) – (N+1, N+1) affine transformation matrix in homogeneous coordinates. The first (N, N) entries correspond to a linear transform and the final column is a lenght N translation vector and a 1 or a napari AffineTransform object. If provided then translate, scale, rotate, and shear values are ignored.

• opacity (float) – Opacity of the layer visual, between 0.0 and 1.0.

• blending (str) – One of a list of preset blending modes that determines how RGB and alpha values of the layer visual get mixed. Allowed values are {‘opaque’, ‘translucent’, and ‘additive’}.

• visible (bool) – Whether the layer visual is currently being displayed.

• multiscale (bool) –

  Whether the data is a multiscale image or not. Multiscale data is represented by a list of array like image data. If not specified by the user and if the data is a list of arrays that decrease in shape then it will be taken to be multiscale. The first image in the list should be the largest. title : string, optional

  The title of the viewer window. by default ‘napari’.

  ndisplay{2, 3}, optional

  Number of displayed dimensions. by default 2.

  ordertuple of int, optional

  Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

  axis_labelslist of str, optional

  Dimension names. by default they are labeled with sequential numbers

  showbool, optional

  Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer

napari.view_layers.view_path(path, *, stack=False, plugin=None, layer_type=None, title='napari', ndisplay=2, order=(), axis_labels=(), show=True, **kwargs)

Create a viewer and add a path layer.

Parameters

• path (str or list of str) – A filepath, directory, or URL (or a list of any) to open.

• stack (bool, optional) – If a list of strings is passed and stack is True, then the entire list will be passed to plugins. It is then up to individual plugins to know how to handle a list of paths. If stack is False, then the path list is broken up and passed to plugin readers one by one. by default False.

• plugin (str, optional) – Name of a plugin to use. If provided, will force path to be read with the specified plugin. If the requested plugin cannot read path, an exception will be raised.

• layer_type (str, optional) – If provided, will force data read from path to be passed to the corresponding add_<layer_type> method (along with any additional) kwargs provided to this function. This may result in exceptions if the data returned from the path is not compatible with the layer_type.

• **kwargs – All other keyword arguments will be passed on to the respective add_layer method.

• title (string, optional) – The title of the viewer window. by default ‘napari’.

• ndisplay ({2, 3}, optional) – Number of displayed dimensions. by default 2.

• order (tuple of int, optional) – Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

• axis_labels (list of str, optional) – Dimension names. by default they are labeled with sequential numbers

• show (bool, optional) – Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer

napari.view_layers.view_points(data=None, *, ndim=None, properties=None, text=None, symbol='o', size=10, edge_width=1, edge_color='black', edge_color_cycle=None, edge_colormap='viridis', edge_contrast_limits=None, face_color='white', face_color_cycle=None, face_colormap='viridis', face_contrast_limits=None, n_dimensional=False, name=None, metadata=None, scale=None, translate=None, rotate=None, shear=None, affine=None, opacity=1, blending='translucent', visible=True, title='napari', ndisplay=2, order=(), axis_labels=(), show=True)

Create a viewer and add a points layer.

Parameters

• data (array (N, D)) – Coordinates for N points in D dimensions.

• ndim (int) – Number of dimensions for shapes. When data is not None, ndim must be D. An empty points layer can be instantiated with arbitrary ndim.

• properties (dict {str: array (N,)}, DataFrame) – Properties for each point. Each property should be an array of length N, where N is the number of points.

• text (str, dict) – Text to be displayed with the points. If text is set to a key in properties, the value of that property will be displayed. Multiple properties can be composed using f-string-like syntax (e.g., ‘{property_1}, {float_property:.2f}). A dictionary can be provided with keyword arguments to set the text values and display properties. See TextManager.__init__() for the valid keyword arguments. For example usage, see /napari/examples/add_points_with_text.py.

• symbol (str) – Symbol to be used for the point markers. Must be one of the following: arrow, clobber, cross, diamond, disc, hbar, ring, square, star, tailed_arrow, triangle_down, triangle_up, vbar, x.

• size (float, array) – Size of the point marker. If given as a scalar, all points are made the same size. If given as an array, size must be the same broadcastable to the same shape as the data.

• edge_width (float) – Width of the symbol edge in pixels.

• edge_color (str, array-like) – Color of the point marker border. Numeric color values should be RGB(A).

• edge_color_cycle (np.ndarray, list) – Cycle of colors (provided as string name, RGB, or RGBA) to map to edge_color if a categorical attribute is used color the vectors.

• edge_colormap (str, napari.utils.Colormap) – Colormap to set edge_color if a continuous attribute is used to set face_color.

• edge_contrast_limits (None, (float, float)) – clims for mapping the property to a color map. These are the min and max value of the specified property that are mapped to 0 and 1, respectively. The default value is None. If set the none, the clims will be set to (property.min(), property.max())

• face_color (str, array-like) – Color of the point marker body. Numeric color values should be RGB(A).

• face_color_cycle (np.ndarray, list) – Cycle of colors (provided as string name, RGB, or RGBA) to map to face_color if a categorical attribute is used color the vectors.

• face_colormap (str, napari.utils.Colormap) – Colormap to set face_color if a continuous attribute is used to set face_color.

• face_contrast_limits (None, (float, float)) – clims for mapping the property to a color map. These are the min and max value of the specified property that are mapped to 0 and 1, respectively. The default value is None. If set the none, the clims will be set to (property.min(), property.max())

• n_dimensional (bool) – If True, renders points not just in central plane but also in all n-dimensions according to specified point marker size.

• name (str) – Name of the layer.

• metadata (dict) – Layer metadata.

• scale (tuple of float) – Scale factors for the layer.

• translate (tuple of float) – Translation values for the layer.

• rotate (float, 3-tuple of float, or n-D array.) – If a float convert into a 2D rotation matrix using that value as an angle. If 3-tuple convert into a 3D rotation matrix, using a yaw, pitch, roll convention. Otherwise assume an nD rotation. Angles are assumed to be in degrees. They can be converted from radians with np.degrees if needed.

• shear (1-D array or n-D array) – Either a vector of upper triangular values, or an nD shear matrix with ones along the main diagonal.

• affine (n-D array or napari.utils.transforms.Affine) – (N+1, N+1) affine transformation matrix in homogeneous coordinates. The first (N, N) entries correspond to a linear transform and the final column is a lenght N translation vector and a 1 or a napari AffineTransform object. If provided then translate, scale, rotate, and shear values are ignored.

• opacity (float) – Opacity of the layer visual, between 0.0 and 1.0.

• blending (str) – One of a list of preset blending modes that determines how RGB and alpha values of the layer visual get mixed. Allowed values are {‘opaque’, ‘translucent’, and ‘additive’}.

• visible (bool) –

  Whether the layer visual is currently being displayed. title : string, optional

  The title of the viewer window. by default ‘napari’.

  ndisplay{2, 3}, optional

  Number of displayed dimensions. by default 2.

  ordertuple of int, optional

  Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

  axis_labelslist of str, optional

  Dimension names. by default they are labeled with sequential numbers

  showbool, optional

  Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer

napari.view_layers.view_shapes(data=None, *, ndim=None, properties=None, text=None, shape_type='rectangle', edge_width=1, edge_color='black', edge_color_cycle=None, edge_colormap='viridis', edge_contrast_limits=None, face_color='white', face_color_cycle=None, face_colormap='viridis', face_contrast_limits=None, z_index=0, name=None, metadata=None, scale=None, translate=None, rotate=None, shear=None, affine=None, opacity=0.7, blending='translucent', visible=True, title='napari', ndisplay=2, order=(), axis_labels=(), show=True)

Create a viewer and add a shapes layer.

Parameters

• data (list or array) – List of shape data, where each element is an (N, D) array of the N vertices of a shape in D dimensions. Can be an 3-dimensional array if each shape has the same number of vertices.

• ndim (int) – Number of dimensions for shapes. When data is not None, ndim must be D. An empty shapes layer can be instantiated with arbitrary ndim.

• properties (dict {str: array (N,)}, DataFrame) – Properties for each shape. Each property should be an array of length N, where N is the number of shapes.

• text (str, dict) – Text to be displayed with the shapes. If text is set to a key in properties, the value of that property will be displayed. Multiple properties can be composed using f-string-like syntax (e.g., ‘{property_1}, {float_property:.2f}). A dictionary can be provided with keyword arguments to set the text values and display properties. See TextManager.__init__() for the valid keyword arguments. For example usage, see /napari/examples/add_shapes_with_text.py.

• shape_type (string or list) – String of shape shape_type, must be one of “{‘line’, ‘rectangle’, ‘ellipse’, ‘path’, ‘polygon’}”. If a list is supplied it must be the same length as the length of data and each element will be applied to each shape otherwise the same value will be used for all shapes.

• edge_width (float or list) – Thickness of lines and edges. If a list is supplied it must be the same length as the length of data and each element will be applied to each shape otherwise the same value will be used for all shapes.

• edge_color (str, array-like) – If string can be any color name recognized by vispy or hex value if starting with #. If array-like must be 1-dimensional array with 3 or 4 elements. If a list is supplied it must be the same length as the length of data and each element will be applied to each shape otherwise the same value will be used for all shapes.

• edge_color_cycle (np.ndarray, list) – Cycle of colors (provided as string name, RGB, or RGBA) to map to edge_color if a categorical attribute is used color the vectors.

• edge_colormap (str, napari.utils.Colormap) – Colormap to set edge_color if a continuous attribute is used to set face_color.

• edge_contrast_limits (None, (float, float)) – clims for mapping the property to a color map. These are the min and max value of the specified property that are mapped to 0 and 1, respectively. The default value is None. If set the none, the clims will be set to (property.min(), property.max())

• face_color (str, array-like) – If string can be any color name recognized by vispy or hex value if starting with #. If array-like must be 1-dimensional array with 3 or 4 elements. If a list is supplied it must be the same length as the length of data and each element will be applied to each shape otherwise the same value will be used for all shapes.

• face_color_cycle (np.ndarray, list) – Cycle of colors (provided as string name, RGB, or RGBA) to map to face_color if a categorical attribute is used color the vectors.

• face_colormap (str, napari.utils.Colormap) – Colormap to set face_color if a continuous attribute is used to set face_color.

• face_contrast_limits (None, (float, float)) – clims for mapping the property to a color map. These are the min and max value of the specified property that are mapped to 0 and 1, respectively. The default value is None. If set the none, the clims will be set to (property.min(), property.max())

• z_index (int or list) – Specifier of z order priority. Shapes with higher z order are displayed ontop of others. If a list is supplied it must be the same length as the length of data and each element will be applied to each shape otherwise the same value will be used for all shapes.

• name (str) – Name of the layer.

• metadata (dict) – Layer metadata.

• scale (tuple of float) – Scale factors for the layer.

• translate (tuple of float) – Translation values for the layer.

• rotate (float, 3-tuple of float, or n-D array.) – If a float convert into a 2D rotation matrix using that value as an angle. If 3-tuple convert into a 3D rotation matrix, using a yaw, pitch, roll convention. Otherwise assume an nD rotation. Angles are assumed to be in degrees. They can be converted from radians with np.degrees if needed.

• shear (1-D array or n-D array) – Either a vector of upper triangular values, or an nD shear matrix with ones along the main diagonal.

• affine (n-D array or napari.utils.transforms.Affine) – (N+1, N+1) affine transformation matrix in homogeneous coordinates. The first (N, N) entries correspond to a linear transform and the final column is a lenght N translation vector and a 1 or a napari AffineTransform object. If provided then translate, scale, rotate, and shear values are ignored.

• opacity (float) – Opacity of the layer visual, between 0.0 and 1.0.

• blending (str) – One of a list of preset blending modes that determines how RGB and alpha values of the layer visual get mixed. Allowed values are {‘opaque’, ‘translucent’, and ‘additive’}.

• visible (bool) –

  Whether the layer visual is currently being displayed. title : string, optional

  The title of the viewer window. by default ‘napari’.

  ndisplay{2, 3}, optional

  Number of displayed dimensions. by default 2.

  ordertuple of int, optional

  Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

  axis_labelslist of str, optional

  Dimension names. by default they are labeled with sequential numbers

  showbool, optional

  Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer

napari.view_layers.view_surface(data, *, colormap='gray', contrast_limits=None, gamma=1, name=None, metadata=None, scale=None, translate=None, rotate=None, shear=None, affine=None, opacity=1, blending='translucent', visible=True, title='napari', ndisplay=2, order=(), axis_labels=(), show=True)

Create a viewer and add a surface layer.

Parameters

• data (3-tuple of array) – The first element of the tuple is an (N, D) array of vertices of mesh triangles. The second is an (M, 3) array of int of indices of the mesh triangles. The third element is the (K0, …, KL, N) array of values used to color vertices where the additional L dimensions are used to color the same mesh with different values.

• colormap (str, napari.utils.Colormap, tuple, dict) – Colormap to use for luminance images. If a string must be the name of a supported colormap from vispy or matplotlib. If a tuple the first value must be a string to assign as a name to a colormap and the second item must be a Colormap. If a dict the key must be a string to assign as a name to a colormap and the value must be a Colormap.

• contrast_limits (list (2,)) – Color limits to be used for determining the colormap bounds for luminance images. If not passed is calculated as the min and max of the image.

• gamma (float) – Gamma correction for determining colormap linearity. Defaults to 1.

• name (str) – Name of the layer.

• metadata (dict) – Layer metadata.

• scale (tuple of float) – Scale factors for the layer.

• translate (tuple of float) – Translation values for the layer.

• rotate (float, 3-tuple of float, or n-D array.) – If a float convert into a 2D rotation matrix using that value as an angle. If 3-tuple convert into a 3D rotation matrix, using a yaw, pitch, roll convention. Otherwise assume an nD rotation. Angles are assumed to be in degrees. They can be converted from radians with np.degrees if needed.

• shear (1-D array or n-D array) – Either a vector of upper triangular values, or an nD shear matrix with ones along the main diagonal.

• affine (n-D array or napari.utils.transforms.Affine) – (N+1, N+1) affine transformation matrix in homogeneous coordinates. The first (N, N) entries correspond to a linear transform and the final column is a lenght N translation vector and a 1 or a napari AffineTransform object. If provided then translate, scale, rotate, and shear values are ignored.

• opacity (float) – Opacity of the layer visual, between 0.0 and 1.0.

• blending (str) – One of a list of preset blending modes that determines how RGB and alpha values of the layer visual get mixed. Allowed values are {‘opaque’, ‘translucent’, and ‘additive’}.

• visible (bool) –

  Whether the layer visual is currently being displayed. title : string, optional

  The title of the viewer window. by default ‘napari’.

  ndisplay{2, 3}, optional

  Number of displayed dimensions. by default 2.

  ordertuple of int, optional

  Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

  axis_labelslist of str, optional

  Dimension names. by default they are labeled with sequential numbers

  showbool, optional

  Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer

napari.view_layers.view_tracks(data, *, properties=None, graph=None, tail_width=2, tail_length=30, name=None, metadata=None, scale=None, translate=None, rotate=None, shear=None, affine=None, opacity=1, blending='additive', visible=True, colormap='turbo', color_by='track_id', colormaps_dict=None, title='napari', ndisplay=2, order=(), axis_labels=(), show=True)

Create a viewer and add a tracks layer.

Parameters

• data (array (N, D+1)) – Coordinates for N points in D+1 dimensions. ID,T,(Z),Y,X. The first axis is the integer ID of the track. D is either 3 or 4 for planar or volumetric timeseries respectively.

• properties (dict {str: array (N,)}, DataFrame) – Properties for each point. Each property should be an array of length N, where N is the number of points.

• graph (dict {int: list}) – Graph representing associations between tracks. Dictionary defines the mapping between a track ID and the parents of the track. This can be one (the track has one parent, and the parent has >=1 child) in the case of track splitting, or more than one (the track has multiple parents, but only one child) in the case of track merging. See examples/tracks_3d_with_graph.py

• color_by (str) – Track property (from property keys) by which to color vertices.

• tail_width (float) – Width of the track tails in pixels.

• tail_length (float) – Length of the track tails in units of time.

• colormap (str) – Default colormap to use to set vertex colors. Specialized colormaps, relating to specified properties can be passed to the layer via colormaps_dict.

• colormaps_dict (dict {str: napari.utils.Colormap}) – Optional dictionary mapping each property to a colormap for that property. This allows each property to be assigned a specific colormap, rather than having a global colormap for everything.

• name (str) – Name of the layer.

• metadata (dict) – Layer metadata.

• scale (tuple of float) – Scale factors for the layer.

• translate (tuple of float) – Translation values for the layer.

• rotate (float, 3-tuple of float, or n-D array.) – If a float convert into a 2D rotation matrix using that value as an angle. If 3-tuple convert into a 3D rotation matrix, using a yaw, pitch, roll convention. Otherwise assume an nD rotation. Angles are assumed to be in degrees. They can be converted from radians with np.degrees if needed.

• shear (1-D array or n-D array) – Either a vector of upper triangular values, or an nD shear matrix with ones along the main diagonal.

• affine (n-D array or napari.utils.transforms.Affine) – (N+1, N+1) affine transformation matrix in homogeneous coordinates. The first (N, N) entries correspond to a linear transform and the final column is a lenght N translation vector and a 1 or a napari AffineTransform object. If provided then translate, scale, rotate, and shear values are ignored.

• opacity (float) – Opacity of the layer visual, between 0.0 and 1.0.

• blending (str) – One of a list of preset blending modes that determines how RGB and alpha values of the layer visual get mixed. Allowed values are {‘opaque’, ‘translucent’, and ‘additive’}.

• visible (bool) –

  Whether the layer visual is currently being displayed. title : string, optional

  The title of the viewer window. by default ‘napari’.

  ndisplay{2, 3}, optional

  Number of displayed dimensions. by default 2.

  ordertuple of int, optional

  Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

  axis_labelslist of str, optional

  Dimension names. by default they are labeled with sequential numbers

  showbool, optional

  Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer

napari.view_layers.view_vectors(data, *, properties=None, edge_width=1, edge_color='red', edge_color_cycle=None, edge_colormap='viridis', edge_contrast_limits=None, length=1, name=None, metadata=None, scale=None, translate=None, rotate=None, shear=None, affine=None, opacity=0.7, blending='translucent', visible=True, title='napari', ndisplay=2, order=(), axis_labels=(), show=True)

Create a viewer and add a vectors layer.

Parameters

• data ((N, 2, D) or (N1, N2, .., ND, D) array) – An (N, 2, D) array is interpreted as “coordinate-like” data and a list of N vectors with start point and projections of the vector in D dimensions. An (N1, N2, …, ND, D) array is interpreted as “image-like” data where there is a length D vector of the projections at each pixel.

• properties (dict {str: array (N,)}, DataFrame) – Properties for each vector. Each property should be an array of length N, where N is the number of vectors.

• edge_width (float) – Width for all vectors in pixels.

• length (float) – Multiplicative factor on projections for length of all vectors.

• edge_color (str) – Color of all of the vectors.

• edge_color_cycle (np.ndarray, list) – Cycle of colors (provided as string name, RGB, or RGBA) to map to edge_color if a categorical attribute is used color the vectors.

• edge_colormap (str, napari.utils.Colormap) – Colormap to set vector color if a continuous attribute is used to set edge_color.

• edge_contrast_limits (None, (float, float)) – clims for mapping the property to a color map. These are the min and max value of the specified property that are mapped to 0 and 1, respectively. The default value is None. If set the none, the clims will be set to (property.min(), property.max())

• name (str) – Name of the layer.

• metadata (dict) – Layer metadata.

• scale (tuple of float) – Scale factors for the layer.

• translate (tuple of float) – Translation values for the layer.

• rotate (float, 3-tuple of float, or n-D array.) – If a float convert into a 2D rotation matrix using that value as an angle. If 3-tuple convert into a 3D rotation matrix, using a yaw, pitch, roll convention. Otherwise assume an nD rotation. Angles are assumed to be in degrees. They can be converted from radians with np.degrees if needed.

• shear (1-D array or n-D array) – Either a vector of upper triangular values, or an nD shear matrix with ones along the main diagonal.

• affine (n-D array or napari.utils.transforms.Affine) – (N+1, N+1) affine transformation matrix in homogeneous coordinates. The first (N, N) entries correspond to a linear transform and the final column is a lenght N translation vector and a 1 or a napari AffineTransform object. If provided then translate, scale, rotate, and shear values are ignored.

• opacity (float) – Opacity of the layer visual, between 0.0 and 1.0.

• blending (str) – One of a list of preset blending modes that determines how RGB and alpha values of the layer visual get mixed. Allowed values are {‘opaque’, ‘translucent’, and ‘additive’}.

• visible (bool) –

  Whether the layer visual is currently being displayed. title : string, optional

  The title of the viewer window. by default ‘napari’.

  ndisplay{2, 3}, optional

  Number of displayed dimensions. by default 2.

  ordertuple of int, optional

  Order in which dimensions are displayed where the last two or last three dimensions correspond to row x column or plane x row x column if ndisplay is 2 or 3. by default None

  axis_labelslist of str, optional

  Dimension names. by default they are labeled with sequential numbers

  showbool, optional

  Whether to show the viewer after instantiation. by default True.

Returns

viewer – The newly-created viewer.

Return type

napari.Viewer