org.locationtech.jts:jts-core 1.18.0
org.locationtech.jts.util

## Class GeometricShapeFactory

• Direct Known Subclasses:
SineStarFactory

```public class GeometricShapeFactory
extends Object```
Computes various kinds of common geometric shapes. Provides various ways of specifying the location and extent and rotations of the generated shapes, as well as number of line segments used to form them.

Example of usage:

```  GeometricShapeFactory gsf = new GeometricShapeFactory();
gsf.setSize(100);
gsf.setNumPoints(100);
gsf.setBase(new Coordinate(100, 100));
gsf.setRotation(0.5);
Polygon rect = gsf.createRectangle();
```
Version:
1.7
• ### Constructor Summary

Constructors
Constructor and Description
`GeometricShapeFactory()`
Create a shape factory which will create shapes using the default `GeometryFactory`.
`GeometricShapeFactory(GeometryFactory geomFact)`
Create a shape factory which will create shapes using the given `GeometryFactory`.
• ### Method Summary

All Methods
Modifier and Type Method and Description
`LineString` ```createArc(double startAng, double angExtent)```
Creates an elliptical arc, as a `LineString`.
`Polygon` ```createArcPolygon(double startAng, double angExtent)```
Creates an elliptical arc polygon.
`Polygon` `createCircle()`
Creates a circular or elliptical `Polygon`.
`Polygon` `createEllipse()`
Creates an elliptical `Polygon`.
`Polygon` `createRectangle()`
Creates a rectangular `Polygon`.
`Polygon` `createSquircle()`
Creates a squircular `Polygon`.
`Polygon` `createSupercircle(double power)`
Creates a supercircular `Polygon` of a given positive power.
`void` `setBase(Coordinate base)`
Sets the location of the shape by specifying the base coordinate (which in most cases is the lower left point of the envelope containing the shape).
`void` `setCentre(Coordinate centre)`
Sets the location of the shape by specifying the centre of the shape's bounding box
`void` `setEnvelope(Envelope env)`
`void` `setHeight(double height)`
Sets the height of the shape.
`void` `setNumPoints(int nPts)`
Sets the total number of points in the created `Geometry`.
`void` `setRotation(double radians)`
Sets the rotation angle to use for the shape.
`void` `setSize(double size)`
Sets the size of the extent of the shape in both x and y directions.
`void` `setWidth(double width)`
Sets the width of the shape.
• ### Methods inherited from class java.lang.Object

`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
• ### Constructor Detail

• #### GeometricShapeFactory

`public GeometricShapeFactory()`
Create a shape factory which will create shapes using the default `GeometryFactory`.
• #### GeometricShapeFactory

`public GeometricShapeFactory(GeometryFactory geomFact)`
Create a shape factory which will create shapes using the given `GeometryFactory`.
Parameters:
`geomFact` - the factory to use
• ### Method Detail

• #### setEnvelope

`public void setEnvelope(Envelope env)`
• #### setBase

`public void setBase(Coordinate base)`
Sets the location of the shape by specifying the base coordinate (which in most cases is the lower left point of the envelope containing the shape).
Parameters:
`base` - the base coordinate of the shape
• #### setCentre

`public void setCentre(Coordinate centre)`
Sets the location of the shape by specifying the centre of the shape's bounding box
Parameters:
`centre` - the centre coordinate of the shape
• #### setNumPoints

`public void setNumPoints(int nPts)`
Sets the total number of points in the created `Geometry`. The created geometry will have no more than this number of points, unless more are needed to create a valid geometry.
• #### setSize

`public void setSize(double size)`
Sets the size of the extent of the shape in both x and y directions.
Parameters:
`size` - the size of the shape's extent
• #### setWidth

`public void setWidth(double width)`
Sets the width of the shape.
Parameters:
`width` - the width of the shape
• #### setHeight

`public void setHeight(double height)`
Sets the height of the shape.
Parameters:
`height` - the height of the shape
• #### setRotation

`public void setRotation(double radians)`
Sets the rotation angle to use for the shape. The rotation is applied relative to the centre of the shape.
Parameters:
`radians` - the rotation angle in radians.
• #### createRectangle

`public Polygon createRectangle()`
Creates a rectangular `Polygon`.
Returns:
a rectangular Polygon
• #### createCircle

`public Polygon createCircle()`
Creates a circular or elliptical `Polygon`.
Returns:
a circle or ellipse
• #### createEllipse

`public Polygon createEllipse()`
Creates an elliptical `Polygon`. If the supplied envelope is square the result will be a circle.
Returns:
an ellipse or circle
• #### createSquircle

`public Polygon createSquircle()`
Creates a squircular `Polygon`.
Returns:
a squircle
• #### createSupercircle

`public Polygon createSupercircle(double power)`
Creates a supercircular `Polygon` of a given positive power.
Returns:
a supercircle
• #### createArc

```public LineString createArc(double startAng,
double angExtent)```
Creates an elliptical arc, as a `LineString`. The arc is always created in a counter-clockwise direction. This can easily be reversed if required by using {#link LineString.reverse()}
Parameters:
`startAng` - start angle in radians
`angExtent` - size of angle in radians
Returns:
an elliptical arc
• #### createArcPolygon

```public Polygon createArcPolygon(double startAng,
double angExtent)```
Creates an elliptical arc polygon. The polygon is formed from the specified arc of an ellipse and the two radii connecting the endpoints to the centre of the ellipse.
Parameters:
`startAng` - start angle in radians
`angExtent` - size of angle in radians
Returns:
an elliptical arc polygon