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## com.vividsolutions.jts.util
Class GeometricShapeFactory

    java.lang.Object
      com.vividsolutions.jts.util.GeometricShapeFactory

Direct Known Subclasses:
  SineStarFactory

    public class GeometricShapeFactory

extends java.lang.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

Nested Class Summary
`protected class` | `GeometricShapeFactory.Dimensions`

Field Summary
`protected GeometricShapeFactory.Dimensions` | `dim`
`protected GeometryFactory` | `geomFact`
`protected int` | `nPts`
`protected PrecisionModel` | `precModel`
`protected double` | `rotationAngle` Default is no rotation.

Constructor Summary
`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
`protected Coordinate` | `coord(double x, double y)`
`protected Coordinate` | `coordTrans(double x, double y, Coordinate trans)`
`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.
`protected Geometry` | `rotate(Geometry geom)`
`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
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### geomFact

    protected GeometryFactory geomFact

### precModel

    protected PrecisionModel precModel

### dim

    protected GeometricShapeFactory.Dimensions dim

### nPts

    protected int nPts

### rotationAngle

    protected double rotationAngle

  Default is no rotation.

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.

### rotate

    protected Geometry rotate(Geometry geom)

### 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

### coord

    protected Coordinate coord(double x,
                               double y)

### coordTrans

    protected Coordinate coordTrans(double x,
                                    double y,
                                    Coordinate trans)

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