# <domain> - Microstructure Domain¶

MicroStructPy supports the following domain geometries:

• 2D: circle, ellipse, rectangle, square

• 3D: box, cube

Each geometry can be defined several ways, such as a center and edge lengths for the rectangle or two bounding points. Note that over-parameterizing the domain geometry will cause unexpected behavior.

## Box¶

Parameters

• bounds - alias for limits

• center - the center of the box

• corner - the bottom-most corner of the box (i.e. $$(x, y, z)_{min}$$)

• limits - the x, y, z upper and lower bounds of the box (i.e. $$[[x_{min}, x_{max}], [y_{min}, y_{max}], [z_{min}, z_{max}]]$$)

• side_lengths - the x, y, and z side lengths of the box

Below are some example box domain definitions.

<?xml version="1.0" encoding="UTF-8"?>
<!-- Example box domains -->
<input>
<domain>
<shape> box </shape>
<!-- default side length is 1 -->
<!-- default center is the origin -->
</domain>

<domain>
<shape> box </shape>
<side_lengths> 2, 1, 6 </side_lengths>
<corner> 0, 0, 0 </corner>
</domain>

<domain>
<shape> BOX </shape>
<limits> 0, 2 </limits>   <!-- x -->
<limits> -2, 1 </limits>  <!-- y -->
<limits> -3, 0 </limits>  <!-- z -->
</domain>

<domain>
<shape> boX </shape>  <!-- case insensitive -->
<bounds> [[0, 2], [-2, 1], [-3, 0]] </bounds>
</domain>
</input>


## Circle¶

Parameters

• area - the area of the circle

• center - the center of the circle

• d - alias for diameter

• diameter - the diameter of the circle

• r - alias for radius

• radius - the radius of the circle

• size - same as diameter

The default radius of a circle is 1, while the default center is (0, 0).

Below are some example circle domain definitions.

<?xml version="1.0" encoding="UTF-8"?>
<!-- Example circle domains -->
<input>
<domain>
<shape> circle </shape>
<!-- default radius is 1 -->
<!-- default center is the origin -->
</domain>

<domain>
<shape> circle </shape>
<diameter> 3 </diameter>
</domain>

<domain>
<shape> circle </shape>
<center> 0, 10 <center>
</domain>
</input>


## Cube¶

Parameters

• center - the center of the cube

• corner - the bottom-most corner of the cube (i.e. $$(x, y, z)_{min}$$)

• side_length - the side length of the cube

The defaultt side length of the cube is 1, while the default center is (0, 0).

Below are some example cube domain definitions.

<?xml version="1.0" encoding="UTF-8"?>
<!-- Example cube domains -->
<input>
<domain>
<shape> cube </shape>
<!-- default side length is 1 -->
<!-- default center is the origin -->
</domain>

<domain>
<shape> cube </shape>
<side_length> 10 </side_length>
<corner> (0, 0, 0) </corner>
</domain>

<domain>
<shape> cube </shape>
<corner> 0, 0, 0 </corner>
</domain>
</input>


## Ellipse¶

Parameters

• a - the semi-major axis of the ellipse

• angle - alias for angle_deg

• angle_deg - the counterclockwise positive angle between the semi-major axis and the +x axis, measured in degrees

• angle_rad - the counterclockwise positive angle between the semi-major axis and the +x axis, measured in radians

• aspect_ratio - the ratio a/b

• axes - semi-axes of ellipse, equivalent to [a, b]

• b - the semi-minor axis of the ellipse

• center - the center of the ellipse

• matrix - orientation matrix for the ellipse

• orientation - alias for matrix

• size - the diameter of a circle with the same area as the ellipse

The default value for the semi-axes of the ellipse is 1. The default orientation of the ellipse is aligned with the coordinate axes. Finally, the default position of the ellipse is centered at (0, 0).

Below are some example ellipse domain definitions.

<?xml version="1.0" encoding="UTF-8"?>
<!-- Example ellipse domains -->
<input>
<domain>
<shape> ellipse </shape>
<!-- default is a unit circle centered at the origin -->
</domain>

<domain>
<shape> ellipse </shape>
<a> 10 </a>
<b>  4 </b>
<angle> 30 </angle>
<center> 2, -1 </center>
</domain>

<domain>
<shape> ellipse </shape>
<axes> 5, 3 </axes>
</domain>

<domain>
<shape> ellipse </shape>
<size> 10 </size>
<aspect_ratio> 5 </aspect_ratio>
<angle_deg> -45 </angle_deg>
</domain>
</input>


## Rectangle¶

Parameters

• bounds - alias for limits

• center - the center of the rectangle

• corner - the bottom-most corner of the rectangle (i.e. $$(x, y)_{min}$$)

• length - the x-direction side length of the rectangle

• limits - the x and y upper and lower bounds of the rectangle (i.e. $$[[x_{min}, x_{max}], [y_{min}, y_{max}]]$$)

• side_lengths - equivalent to [length, width]

• width - the y-direction side length of the rectangle

The default side lengths of the rectangle are 1, while the default position is centered at the origin.

Below are some example rectangle domain definitions.

<?xml version="1.0" encoding="UTF-8"?>
<!-- Example rectangle domains -->
<input>
<domain>
<shape> rectangle </shape>
<!-- default side length is 1 -->
<!-- default center is the origin -->
</domain>

<domain>
<shape> rectangle </shape>
<side_lengths> 2, 1 </side_lengths>
<corner> 0, 0 </corner>
</domain>

<domain>
<shape> rectangle </shape>
<limits> 0, 2 </limits>   <!-- x -->
<limits> -2, 1 </limits>  <!-- y -->
</domain>

<domain>
<shape> rectangle </shape>
<bounds> [[0, 2], [-2, 1]] </bounds>
</domain>
</input>


## Square¶

Parameters

• side_length - the side length of the square

• center - the position of the center of the square

• corner - the bottom-most corner of the square (i.e. $$(x, y)_{min}$$)

The default side length of a square is 1, while the default center position is (0, 0).

Below are some example square domain definitions.

<?xml version="1.0" encoding="UTF-8"?>
<!-- Example square domains -->
<input>
<domain>
<shape> square </shape>
<!-- default side length is 1 -->
<!-- default center is the origin -->
</domain>

<domain>
<shape> square </shape>
<side_length> 2 </side_length>
<corner> 0, 0 </corner>
</domain>

<domain>
<shape> square </shape>
<corner> 0, 0 </corner>
</domain>

<domain>
<shape> square </shape>
<side_length> 10 </side_length>
<center> 5, 0 </center>
</domain>
</input>