Package org.locationtech.jts.util
Class GeometricShapeFactory
java.lang.Object
org.locationtech.jts.util.GeometricShapeFactory
- Direct Known Subclasses:
SineStarFactory
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
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Constructor Summary
ConstructorsConstructorDescriptionCreate a shape factory which will create shapes using the defaultGeometryFactory
.GeometricShapeFactory
(GeometryFactory geomFact) Create a shape factory which will create shapes using the givenGeometryFactory
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Method Summary
Modifier and TypeMethodDescriptioncreateArc
(double startAng, double angExtent) Creates an elliptical arc, as aLineString
.createArcPolygon
(double startAng, double angExtent) Creates an elliptical arc polygon.Creates a circular or ellipticalPolygon
.Creates an ellipticalPolygon
.Creates a rectangularPolygon
.Creates a squircularPolygon
.createSupercircle
(double power) Creates a supercircularPolygon
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 boxvoid
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 createdGeometry
.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.
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Constructor Details
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GeometricShapeFactory
public GeometricShapeFactory()Create a shape factory which will create shapes using the defaultGeometryFactory
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GeometricShapeFactory
Create a shape factory which will create shapes using the givenGeometryFactory
.- Parameters:
geomFact
- the factory to use
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Method Details
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setEnvelope
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setBase
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
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setCentre
Sets the location of the shape by specifying the centre of the shape's bounding box- Parameters:
centre
- the centre coordinate of the shape
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setNumPoints
public void setNumPoints(int nPts) Sets the total number of points in the createdGeometry
. 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
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setWidth
public void setWidth(double width) Sets the width of the shape.- Parameters:
width
- the width of the shape
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setHeight
public void setHeight(double height) Sets the height of the shape.- Parameters:
height
- the height of the shape
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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.
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createRectangle
Creates a rectangularPolygon
.- Returns:
- a rectangular Polygon
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createCircle
Creates a circular or ellipticalPolygon
.- Returns:
- a circle or ellipse
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createEllipse
Creates an ellipticalPolygon
. If the supplied envelope is square the result will be a circle.- Returns:
- an ellipse or circle
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createSquircle
Creates a squircularPolygon
.- Returns:
- a squircle
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createSupercircle
Creates a supercircularPolygon
of a given positive power.- Returns:
- a supercircle
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createArc
Creates an elliptical arc, as aLineString
. 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 radiansangExtent
- size of angle in radians- Returns:
- an elliptical arc
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createArcPolygon
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 radiansangExtent
- size of angle in radians- Returns:
- an elliptical arc polygon
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