Cartesian2D Class¶
 class plask.geometry.Cartesian2D(root, length=infty, **edges)¶
Geometry in 2D Cartesian space.
Create a space around a twodimensional geometry object with a given length.
 Parameters:
root (GeometryObject2D Extrusion) – Root object of the geometry. If this parameters is an extrusion, the length should be skipped, as it is read directly from extrusion.
length (float) – Length of the geometry. This information is required by some solvers. Furthermore it is necessary if you want to use
plask.filters
to translate the data between this geometry and theCartesian3D
geometry.edges (dict) – Optional edges specification. Edges are given as additional constructor keyword arguments. Available keys are left, right, top, and bottom and their values must be strings specifying the edge (either a material name or mirror, periodic, or extend).
Example
>>> block = geometry.Block2D(4, 2, 'GaAs') >>> geometry.Cartesian2D(block, length=10, left='mirror', bottom='AlAs') <plask.geometry.Cartesian2D object at (0x3dd6c70)>
Methods¶

Get rectangular grid for space. 

Get list of the geometry tree leafs. 

Calculate bounding boxes of all the geometry tree leafs. 

Calculate positions of all the geometry tree leafs. 

Get list of 

Get list of the geometry tree objects matching condition. 

Get material at the given point. 

Distribution of materials for a given geometry on a mesh. 

Calculate bounding boxes of all instances of specified object. 

Calculate positions of all instances of the specified object. 

Get subtree containing paths to all leafs covering the specified point. 

Get list of the geometry tree objects that have the specified role. 

Get roles of objects at specified point. 

Test if the specified point has a given role. 

Modify all objects in the geometry tree. 

Test if the specified geometry object contains a point. 

Check if the object is complete and ready for calculations. 
Attributes¶
Names of axes for this geometry. 

Material at the negative side of the axis along the extrusion. 

Minimal rectangle which contains all points of the geometry object. 

Material of the empty regions of the geometry. 

Number of object's dimensions (int, 2 or 3). 

Dictionary specifying the geometry edges. 



Material at the positive side of the axis along the extrusion. 



Step info for mesh generation for nonuniform objects. 
Descriptions¶
Method Details¶
 Cartesian2D.get_grid()¶
Get rectangular grid for space.
Return rectangular mesh that has lines along the edges of all the geometry objects. In some objects are nonrectangular or nonuniform, they are divided according to their settings.
 Cartesian2D.get_leafs(path=None)¶
Get list of the geometry tree leafs.
This method returns all the geometry tree leafs located under this geometry object. By leaf we understand a proper geometry object, in contrast to any container or transformation.
 Parameters:
path – Path that can be used to select only some leafs.
 Returns:
List of translations of the leafs.
 Return type:
sequence
All these methods are guaranteed to return their sequences in the same order:
get_leafs()
,get_leafs_bboxes()
,get_leafs_positions()
,get_leafs_translations()
.
 Cartesian2D.get_leafs_bboxes(path=None)¶
Calculate bounding boxes of all the geometry tree leafs.
This method computes the bounding boxes of all the geometry tree leafs located under this geometry object. By leaf we understand a proper geometry object, in contrast to any container or transformation.
 Parameters:
path – Path that can be used to select only some leafs.
 Returns:
List of vectors containing the position of the leafs.
 Return type:
sequence
All these methods are guaranteed to return their sequences in the same order:
get_leafs()
,get_leafs_bboxes()
,get_leafs_positions()
,get_leafs_translations()
.
 Cartesian2D.get_leafs_positions(path=None)¶
Calculate positions of all the geometry tree leafs.
This method computes position of all the geometry tree leafs located under this geometry object. By leaf we understand a proper geometry object, in contrast to any container or transformation.
 Parameters:
path – Path that can be used to select only some leafs.
 Returns:
List of vectors containing the position of the leafs.
 Return type:
sequence
All these methods are guaranteed to return their sequences in the same order:
get_leafs()
,get_leafs_bboxes()
,get_leafs_positions()
,get_leafs_translations()
.
 Cartesian2D.get_leafs_translations(path=None)¶
Get list of
Translation
objects holding all the geometry tree leafs.This method computes the
Translation
objects of all the geometry tree leafs located under this geometry object. By leaf we understand a proper geometry object, in contrast to any container or transformation. Parameters:
path – Path that can be used to select only some leafs.
 Returns:
List of translations of the leafs.
 Return type:
sequence
All these methods are guaranteed to return their sequences in the same order:
get_leafs()
,get_leafs_bboxes()
,get_leafs_positions()
,get_leafs_translations()
.
 Cartesian2D.get_matching_objects(cond)¶
Get list of the geometry tree objects matching condition.
This method returns all the objects in the geometry tree that match the specified condition.
 Parameters:
cond – Python callable that accepts a geometry object and returns Boolean indicating whether the object should be returned by this method or not.
 Returns:
List of objects matching your condition.
 Return type:
sequence
 Cartesian2D.get_material(c0, c1)¶
 Cartesian2D.get_material(point)
Get material at the given point.
This method returns a material object with the material at the given point if this point is located within the geometry object self. Otherwise the method returns
default_material
. Parameters:
point (plask.vector) – Vector with local coordinates of the tested point.
c0 (float) – Horizontal coordinate of the tested point.
c1 (float) – Vertical coordinate of the tested point.
 Returns:
Material at the specified point.
 Cartesian2D.get_material_field(mesh)¶
Distribution of materials for a given geometry on a mesh.
This class creates a ‘field’ of
material.Material
objects and provides getters to easily obtain its properties asData
object. Parameters:
geometry – Geometry for which the materials a retrieved
mesh – Mesh at which the parameters are retrieved
Example
>>> material_field = this_geometry.get_material_field(your_mesh) >>> plot_field(material_field.thermk(300.), comp=0)
 Cartesian2D.get_object_bboxes(object, path=None)¶
Calculate bounding boxes of all instances of specified object.
The bounding boxes are computed in the local coordinates of self.
 Parameters:
object – Object to test.
path – Path specifying a particular object instance.
 Returns:
List of bounding boxes of the instances of the object.
 Return type:
sequence
All these methods are guaranteed to return their sequences in the same order, provided they are called with the same arguments:
get_object_bboxes()
,get_object_positions()
 Cartesian2D.get_object_positions(object, path=None)¶
Calculate positions of all instances of the specified object.
 Parameters:
object – Object to test.
path – Path specifying a particular object instance.
 Returns:
List of vectors containing the position of the instances of the object.
 Return type:
sequence
All these methods are guaranteed to return their sequences in the same order, provided they are called with the same arguments:
get_object_bboxes()
,get_object_positions()
 Cartesian2D.get_paths(c0, c1, all=False)¶
 Cartesian2D.get_paths(point, all=False)
Get subtree containing paths to all leafs covering the specified point.
 Parameters:
point (plask.vector) – Vector with local coordinates of the tested point.
c0 (float) – Horizontal coordinate of the tested point.
c1 (float) – Vertical coordinate of the tested point.
all (bool) – If True then all the leafs intersecting the point are considered. Otherwise, only the path to the topmost (i.e. visible) object is returned.
 Returns:
Subtree with the path to the specified point.
See also
 Cartesian2D.get_role_objects(role)¶
Get list of the geometry tree objects that have the specified role.
This method returns all the objects in the geometry tree that have the specified role.
Warning!
This method will return the very object with the role specified and not its items, which is against the normal behavior of the roles.
 Parameters:
role (str) – Role to search objects with.
 Returns:
List of objects matching your condition.
 Return type:
sequence
 Cartesian2D.get_roles(c0, c1)¶
 Cartesian2D.get_roles(point)
Get roles of objects at specified point.
This method returns a set of all the roles given to the every object intersecting the specified point.
 Parameters:
point (plask.vector) – Vector with local coordinates of the tested point.
c0 (float) – Horizontal coordinate of the tested point.
c1 (float) – Vertical coordinate of the tested point.
 Returns:
Set of the roles at given point.
 Return type:
set
 Cartesian2D.has_role(role, point)¶
 Cartesian2D.has_role(role, c0, c1)
Test if the specified point has a given role.
This method checks if any object intersecting the specified point has the role role.
 Parameters:
point (plask.vector) – Vector with local coordinates of the tested point.
c0 (float) – Horizontal coordinate of the tested point.
c1 (float) – Vertical coordinate of the tested point.
 Returns:
True if the point has the role role.
 Return type:
bool
 Cartesian2D.modify_objects(callable)¶
Modify all objects in the geometry tree.
This method calls
callable
on every object in the geometry tree. Thecallable
takes a single geometry object as an argument and should returnNone
(in which case nothing happens), a new object to replace the original one, or an empty tuple (which will result in the removal of the original object). Parameters:
callable – a callable filtering each object in the tree
 Returns:
modified geometry
 Return type:
 Cartesian2D.object_contains(object, c0, c1)¶
 Cartesian2D.object_contains(object, point)
 Cartesian2D.object_contains(object, path, c0, c1)
 Cartesian2D.object_contains(object, path, point)
 Cartesian2D.object_contains(object, mesh)
 Cartesian2D.object_contains(object, path, mesh)
Test if the specified geometry object contains a point.
The given geometry object must be located somewhere within the self geometry tree.
 Parameters:
object – Object to test.
path – Path specifying a particular object instance.
point (plask.vector) – Vector with local coordinates of the tested point.
c0 (float) – Horizontal coordinate of the tested point.
c1 (float) – Vertical coordinate of the tested point.
mesh (plask.mesh.Mesh) – Mesh, which points are tested.
 Returns:
 True if the specified geometry object contains the given point.
If a mesh is tested, the return value is an array of bools.
 Return type:
bool
 Cartesian2D.validate()¶
Check if the object is complete and ready for calculations.
This method is specific for a particular object. It raises an exception if the object definition is somehow incomplete.
Attribute Details¶
 Cartesian2D.axes = <property object>¶
Names of axes for this geometry.
 Cartesian2D.back_material = <property object>¶
Material at the negative side of the axis along the extrusion.
 Cartesian2D.bbox = <property object>¶
Minimal rectangle which contains all points of the geometry object.
See also
 Cartesian2D.default_material = <property object>¶
Material of the empty regions of the geometry.
This material is returned by
get_material()
for the points that do not belong to any object in the geometry tree.
 Cartesian2D.dims = <property object>¶
Number of object’s dimensions (int, 2 or 3).
 Cartesian2D.edges = <property object>¶
Dictionary specifying the geometry edges.
 Cartesian2D.front_material = <property object>¶
Material at the positive side of the axis along the extrusion.
 Cartesian2D.item = <property object>¶
GeometryObject2D
at the root of the geometry tree.
 Cartesian2D.steps = <property object>¶
Step info for mesh generation for nonuniform objects.
This parameter is considered only for the nonuniform leafs in the geometry tree. It has two attributes that can be changed:
num
Maximum number of the mesh steps in each direction the object is divided into.
dist
Minimum step size.
The exact meaning of these attributes depend on the mesh generator, however in general they indicate how densely should the nonuniform object be subdivided.
It is possible to assign simply an integer number to this parameter, in which case it changes its
num
attribute.