PolygonShape¶
Namespace: ThinkGeo.Core
This class represents a polygon, which is defined as a single outer ring with zero-to-many inner rings.
public class PolygonShape : AreaBaseShape
Inheritance Object → BaseShape → AreaBaseShape → PolygonShape
Remarks:
None
Properties¶
OuterRing¶
This property is the outer RingShape of the polygon.
public RingShape OuterRing { get; set; }
Property Value¶
RingShape
This property is the outer RingShape of the polygon.
Remarks:
None
InnerRings¶
This property is the collection of RingShapes that make up the inner rings.
public Collection<RingShape> InnerRings { get; }
Property Value¶
Collection<RingShape>
This property is the collection of RingShapes that make up the inner rings.
Remarks:
None
Id¶
The id of the shape.
public string Id { get; set; }
Property Value¶
Tag¶
The tag of the shape.
public object Tag { get; set; }
Property Value¶
Constructors¶
PolygonShape()¶
This constructor creates a PolygonShape.
public PolygonShape()
Remarks:
None
PolygonShape(RingShape)¶
This constructor creates a PolygonShape.
public PolygonShape(RingShape outerRing)
Parameters¶
outerRing RingShape
Remarks:
None
PolygonShape(RingShape, IEnumerable<RingShape>)¶
public PolygonShape(RingShape outerRing, IEnumerable<RingShape> innerRings)
Parameters¶
outerRing RingShape
innerRings IEnumerable<RingShape>
Exceptions¶
ArgumentNullException
If you pass a null as the outerRing, we will throw an ArgumentNullException.
ArgumentNullException
If you pass a null as the innerRings, we will throw an ArgumentNullException.
PolygonShape(String)¶
This constructor creates a PolygonShape.
public PolygonShape(string wellKnownText)
Parameters¶
wellKnownText String
This parameter is the well-known text used to build the shape.
Exceptions¶
ArgumentException
Passing invalid well-known text in the wellKnownText parameter will throw an ArgumentException.
ArgumentNullException
Passing a null as the wellKnownText parameter will throw an ArgumentNullException.
Remarks:
None
PolygonShape(Byte[])¶
This constructor creates a PolygonShape.
public PolygonShape(Byte[] wellKnownBinary)
Parameters¶
wellKnownBinary Byte[]
This parameter is the well-known binary used to build the shape.
Exceptions¶
ArgumentException
Passing invalid well-known binary in the bytes parameter will throw an ArgumentException.
ArgumentNullException
Passing a null as the bytes parameter will throw an ArgumentNullException.
Remarks:
None
Methods¶
GetWellKnownTypeCore()¶
This method returns the well-known type for the shape.
protected WellKnownType GetWellKnownTypeCore()
Returns¶
WellKnownType
This method returns the well-known type for the shape.
Remarks:
None
CloneDeepCore()¶
This method returns a complete copy of the shape without any references in common.
protected BaseShape CloneDeepCore()
Returns¶
This method returns a complete copy of the shape without any references in
common.
Remarks:
When you override this method, you need to ensure that there are no references in common between the original and the copy.
GetPerimeterCore(GeographyUnit, DistanceUnit)¶
This method returns the perimeter of the shape, defined as the sum of the lengths of all its sides.
protected double GetPerimeterCore(GeographyUnit shapeUnit, DistanceUnit returningUnit)
Parameters¶
shapeUnit GeographyUnit
This is the GeographyUnit of the shape you are performing the operation
on.
returningUnit DistanceUnit
This is the DistanceUnit you would like to use as the return value. For example, if
you select miles as your returningUnit, then the distance will be returned in
miles.
Returns¶
The return unit is based on the LengthUnit you specify in the returningUnit
parameter, regardless of the shape's GeographyUnit.
Exceptions¶
ArgumentOutOfRangeException
If you pass in a shapeUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
ArgumentOutOfRangeException
If you pass in a returningUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
Remarks:
You would use this method to find the distance around the area shape.
GetAreaCore(GeographyUnit, AreaUnit)¶
This method returns the area of the shape, defined as the size of the region enclosed by the figure.
protected double GetAreaCore(GeographyUnit shapeUnit, AreaUnit returningUnit)
Parameters¶
shapeUnit GeographyUnit
This is the GeographyUnit of the shape you are performing the operation
on.
returningUnit AreaUnit
This is the AreaUnit you would like to use as the return value. For example, if
you select square miles as your returningUnit, then the distance will be returned in
square miles.
Returns¶
The return unit is based on the AreaUnit you specify in the returningUnit
parameter, regardless of the shape's GeographyUnit.
Exceptions¶
ArgumentOutOfRangeException
If you pass in a shapeUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
ArgumentOutOfRangeException
If you pass in a returningUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
Remarks:
You would use this method to find the area inside the shape.
ScaleUpCore(Double)¶
This method increases the size of the area shape by the percentage given in the percentage parameter.
protected void ScaleUpCore(double percentage)
Parameters¶
percentage Double
This is the percentage by which to increase the shape's size.
Exceptions¶
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
ArgumentOutOfRangeException
Passing an invalid percentage which is less than 0 will throw an ArgumentOutOfRangeException.
Remarks:
This method is useful when you would like to increase the size of the shape. Note that a larger percentage will scale the shape up faster, as you are applying the operation multiple times. There is also a ScaleDown method that will shrink the shape.
ScaleDownCore(Double)¶
This method decreases the size of the area shape by the percentage given in the percentage parameter.
protected void ScaleDownCore(double percentage)
Parameters¶
percentage Double
This is the percentage by which to decrease the shape's size.
Exceptions¶
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
ArgumentOutOfRangeException
Passing an invalid percentage which is less than 0 will throw an ArgumentOutOfRangeException.
Remarks:
None
RegisterCore(PointShape, PointShape, DistanceUnit, GeographyUnit)¶
This method returns a BaseShape which has been registered from its original coordinate system to another based on two anchor PointShapes.
protected BaseShape RegisterCore(PointShape fromPoint, PointShape toPoint, DistanceUnit fromUnit, GeographyUnit toUnit)
Parameters¶
fromPoint PointShape
This parameter is the anchor PointShape in the coordinate of origin.
toPoint PointShape
This parameter is the anchor PointShape in the coordinate of destination.
fromUnit DistanceUnit
This parameter is the DistanceUnit of the coordinate of origin.
toUnit GeographyUnit
This parameter is the GeographyUnit of the coordinate of destination.
Returns¶
BaseShape
This method returns a BaseShape which has been registered from its original coordinate system to another based on two anchor PointShapes.
Exceptions¶
ArgumentOutOfRangeException
If you pass in a fromUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
ArgumentOutOfRangeException
If you pass in a toUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
ArgumentNullException
Passing a null as the fromPoint parameter will throw an ArgumentNullException.
ArgumentNullException
Passing a null as the toPoint parameter will throw an ArgumentNullException.
Remarks:
Registering allows you to take a geometric shape generated in a planar system and attach it to the ground in a Geographic Unit.
A common scenario is integrating geometric shapes from external programs (such as CAD software or a modeling system) and placing them onto a map. You may have the schematics of a building in a CAD system and the relationship between all the points of the building are in feet. You want to then take the CAD image and attach it to where it really exists on a map. You would use the register method to do this.
Registering is also useful for scientific modeling, where software models things such as a plume of hazardous materials or the fallout from a volcano. The modeling software typically generates these models in a fictitious planar system. You would then use the register to take the abstract model and attach it to a map with real coordinates.
TranslateByOffsetCore(Double, Double, GeographyUnit, DistanceUnit)¶
This method moves the base shape from one location to another, based on an X and Y offset distance.
protected void TranslateByOffsetCore(double xOffsetDistance, double yOffsetDistance, GeographyUnit shapeUnit, DistanceUnit distanceUnit)
Parameters¶
xOffsetDistance Double
This is the number of horizontal units of movement in the DistanceUnit specified as
the distanceUnit.
yOffsetDistance Double
This is the number of horizontal units of movement in the DistanceUnit specified as
the distanceUnit.
shapeUnit GeographyUnit
This is the GeographicUnit of the shape you are performing the operation on.
distanceUnit DistanceUnit
This is the DistanceUnit you would like to use as the measure for the move. For example, if you select miles as your distanceUnit, then the xOffsetDistance and yOffsetDistance will be calculated in miles.
Exceptions¶
ArgumentOutOfRangeException
If you pass in a distanceUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
ArgumentOutOfRangeException
If you pass in a shapeUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
InvalidOperationException
In the event you attempt to call this method from a shape which has no points, it will throw an InvalidOperationException.
Remarks:
This method moves the base shape from one location to another, based on an X and Y offset distance. With this overload, it is important to note that the X and Y offset units are based on the distanceUnit parameter. For example, if your shape is in decimal degrees and you call this method with an X offset of 1 and a Y offset of 1, you're going to move this shape 1 unit of the distanceUnit in the horizontal direction and one unit of the distanceUnit in the vertical direction. In this way, you can easily move a shape in decimal degrees five miles to on the X axis and 3 miles on the Y axis.
TranslateByDegreeCore(Double, Double, GeographyUnit, DistanceUnit)¶
This method moves the base shape from one location to another, based on a distance and a direction in degrees.
protected void TranslateByDegreeCore(double distance, double angleInDegrees, GeographyUnit shapeUnit, DistanceUnit distanceUnit)
Parameters¶
distance Double
The distance is the number of units to move the shape in the angle specified. The
distance unit will be the same as the GeographyUnit for the shape. The distance must be
greater than or equal to 0.
angleInDegrees Double
A number between 0 and 360 degrees that represents the direction you wish to move the shape, with 0 being up.
shapeUnit GeographyUnit
This is the GeographicUnit of the shape you are performing the operation on.
distanceUnit DistanceUnit
This is the DistanceUnit you would like to use as the measure for the move. For example, if you select miles as your distanceUnit, then the xOffsetDistance and yOffsetDistance will be calculated in miles.
Exceptions¶
ArgumentOutOfRangeException
Passing an invalid angleInDegrees which is not between 0 and 360 will throw an ArgumentOutOfRangeException.
InvalidOperationException
In the event you attempt to call this method from a shape which has no points, it will throw an InvalidOperationException.
ArgumentOutOfRangeException
Passing an invalid distance which is not greater than or equal to 0 will throw an ArgumentOutOfRangeException.
Remarks:
This method moves the base shape from one location to another, based on an angleInDegrees and distance parameter. With this overload, it is important to note that the distance units are the same GeographicUnit as the shape. For example, if your shape is in decimal degrees and you call this method with a distance of 1, you're going to move this shape 1 decimal degree in direction of the angleInDegrees. In many cases it is more useful to specify the DistanceUnit of movement, such as in miles or yards, so for these scenarios there is another overload you may want to use instead.
If you pass a distance of 0, then the operation is ignored.
RotateCore(PointShape, Double)¶
This method rotates the shape a number of degrees based on a pivot point.
protected void RotateCore(PointShape pivotPoint, double degreeAngle)
Parameters¶
pivotPoint PointShape
The pivotPoint represents the center of rotation.
degreeAngle Double
The number of degrees of rotation required from 0 to 360.
Exceptions¶
ArgumentNullException
If you pass a null as the pivotPoint, we will throw an ArgumentNullException.
ArgumentOutOfRangeException
Passing an invalid degreeAngle which is not between 0 and 360 will throw an ArgumentOutOfRangeException.
InvalidOperationException
In the event you attempt to call this method on a shape which is not valid, it will throw an InvalidOperationException.
Remarks:
This method rotates the shape a number of degrees based on a pivot point. By placing the pivot point in the center of the shape, you can achieve in-place rotation. By moving the pivot point outside of the center of the shape, you can translate the shape in a circular motion. Moving the pivot point further outside of the center will make the circular area larger.
GetClosestPointToCore(BaseShape, GeographyUnit)¶
This method returns the point of the current shape that is closest to the target shape.
protected PointShape GetClosestPointToCore(BaseShape targetShape, GeographyUnit shapeUnit)
Parameters¶
targetShape BaseShape
The shape you are trying to find the closest point to.
shapeUnit GeographyUnit
This is the GeographicUnit of the shape you are performing the operation on.
Returns¶
A PointShape representing the closest point of the current shape to the
targetShape.
Exceptions¶
ArgumentException
If you pass in a targetShape which does not have any points, we will throw an ArgumentException.
ArgumentNullException
If you pass a null as the targetShape, we will throw an ArgumentNullException.
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
ArgumentOutOfRangeException
If you pass in a shapeUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
Remarks:
This method returns the point of the current shape that is closest to the target shape. It is often the case that the point returned is not a point of the object itself. An example would be a line with two points that are far apart from each other. If you set the targetShape to be a point midway between the points but a short distance away from the line, the method would return a point that is on the line but not either of the two points that make up the line.
GetDistanceToCore(BaseShape, GeographyUnit, DistanceUnit)¶
This method computes the distance between the current shape and the targetShape.
protected double GetDistanceToCore(BaseShape targetShape, GeographyUnit shapeUnit, DistanceUnit distanceUnit)
Parameters¶
targetShape BaseShape
The shape you are trying to find the distance to.
shapeUnit GeographyUnit
This is the GeographicUnit of the shape you are performing the operation on.
distanceUnit DistanceUnit
This is the DistanceUnit you would like to use for the distance parameter. For
example, if you select miles as your distanceUnit, then the distance will be measured
in miles.
Returns¶
Exceptions¶
ArgumentException
If you pass in a targetShape which does not have any points, we will throw an ArgumentException.
ArgumentNullException
If you pass a null as the targetShape, we will throw an ArgumentNullException.
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
ArgumentOutOfRangeException
If you pass in a shapeUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
ArgumentOutOfRangeException
If you pass in a distanceUnit that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
Remarks:
None
GetWellKnownTextCore(RingOrder)¶
This method returns the well-known text representation of this shape.
protected string GetWellKnownTextCore(RingOrder outerRingOrder)
Parameters¶
outerRingOrder RingOrder
Returns¶
String
This method returns a string that represents the shape in well-known text.
Exceptions¶
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
Remarks:
This method returns a string that represents the shape in well-known text. Well-known text allows you to describe a geometry as a string of text. Well-known text is useful when you want to save a geometry in a format such as a text file, or when you simply want to cut and paste the text between other applications. An alternative to well-known text is well-known binary, which is a binary representation of a geometry object. We have methods that work with well-known binary as well. Below are some samples of what well-known text might look like for various kinds of geometric shapes.
POINT(5 17)
LINESTRING(4 5,10 50,25 80)
POLYGON((2 2,6 2,6 6,2 6,2 2),(3 3,4 3,4 4,3 4,3 3))
MULTIPOINT(3.7 9.7,4.9 11.6)
MULTILINESTRING((4 5,11 51,21 26),(-4 -7,-9 -7,-14 -3))
MULTIPOLYGON(((2 2,6 2,6 6,2 6,2 2),(3 3,4 3,4 4,3 4,3 3)),((4 4,7 3,7 5,4 4)))
GetWellKnownBinaryCore(RingOrder, WkbByteOrder)¶
This method returns a byte array that represents the shape in well-known binary.
protected Byte[] GetWellKnownBinaryCore(RingOrder outerRingOrder, WkbByteOrder byteOrder)
Parameters¶
outerRingOrder RingOrder
byteOrder WkbByteOrder
This parameter specifies whether the byte order is big- or little-endian.
Returns¶
This method returns a byte array that represents the shape in well-known
binary.
Exceptions¶
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
ArgumentOutOfRangeException
If you pass in a ByteOrder that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
Remarks:
This method returns a byte array that represents the shape in well-known binary. Well-known binary allows you to describe a geometry as a binary array. Well-known binary is useful when you want to save a geometry in an efficient format using as little space as possible. An alternative to well-known binary is well-known text, which is a textual representation of a geometry object. We have methods that work with well-known text as well.
LoadFromWellKnownDataCore(String)¶
This method returns the center point of the current shape's bounding box.
protected void LoadFromWellKnownDataCore(string wellKnownText)
Parameters¶
wellKnownText String
Exceptions¶
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
Remarks:
This method returns the center point of the current shape's bounding box. It is important to note that this is the center point of the bounding box. There are numerous ways to calculate the "center" of a geometry, such as its weighted center, etc. You can find other centers by examining the various methods of the shape itself.
Overriding:
Please ensure that you validate the parameters being passed in and raise the exceptions defined above.
LoadFromWellKnownDataCore(Byte[])¶
This method hydrates the current shape with its data from well-known binary.
protected void LoadFromWellKnownDataCore(Byte[] wellKnownBinary)
Parameters¶
wellKnownBinary Byte[]
This parameter is the well-known binary used to populate the shape.
Exceptions¶
ArgumentException
Passing invalid well-known binary in the bytes parameter will throw an ArgumentException.
ArgumentNullException
Passing a null as the bytes parameter will throw an ArgumentNullException.
Remarks:
This is used when you want to hydrate a shape based on well-known binary. You can create the shape and then load the well-known binary using this method.
ValidateCore(ShapeValidationMode)¶
This method returns a ShapeValidationResult based on a series of tests.
protected ShapeValidationResult ValidateCore(ShapeValidationMode validationMode)
Parameters¶
validationMode ShapeValidationMode
This parameter determines whether the test is simple or advanced. In some cases, the
advanced tests can take some time. The simple test is designed to always be
fast.
Returns¶
This method returns a ShapeValidationResult based on a series of
tests.
Exceptions¶
ArgumentOutOfRangeException
If you pass in a validationMode that is not defined in the enumeration, it will throw a ArgumentOutOfRangeException.
Remarks:
We use this method, with the simple enumeration, internally before doing any kind of other methods on the shape. In this way, we are able to verify the integrity of the shape itself. If you wish to test things such as whether a polygon self-intersects, we invite you to call this method with the advanced ShapeValidationMode. One thing to consider is that for complex polygon shapes this operation could take some time, which is why we only run the basic, faster test. If you are dealing with polygon shapes that are suspect, we suggest you run the advanced test.
GetBoundingBoxCore()¶
This constructor creates the LineShape.
protected RectangleShape GetBoundingBoxCore()
Returns¶
RectangleShape
None
Exceptions¶
ArgumentException
Passing invalid well-known binary in the bytes parameter will throw an ArgumentException.
ArgumentNullException
Passing a null as the bytes parameter will throw an ArgumentNullException.
Remarks:
None
GetCrossingCore(BaseShape)¶
This method returns the crossing points between the current shape and the passed-in target shape.
protected MultipointShape GetCrossingCore(BaseShape targetShape)
Parameters¶
targetShape BaseShape
The target shape you wish to get crossing with.
Returns¶
This method returns the crossing points between the current shape and the passed-in target shape.
Exceptions¶
InvalidOperationException
In the event you attempt to call this method on a shape which has no points, it will throw an InvalidOperationException.
ArgumentNullException
If you pass a null as the targetShape, we will throw an ArgumentNullException.
Remarks:
As this is a concrete public method that wraps a Core method, we reserve the right to add events and other logic to pre- or post-process data returned by the Core version of the method. In this way, we leave our framework open on our end, but also allow you the developer to extend our logic to suit your needs. If you have questions about this, please contact our support team as we would be happy to work with you on extending our framework.
RemoveVertex(Vertex, PolygonShape)¶
This method removes the selected vertex from polygon shape.
public static bool RemoveVertex(Vertex selectedVertex, PolygonShape polygonShape)
Parameters¶
selectedVertex Vertex
The selected vertex must be a vertex of polygon shape, otherwise it will return false and polygon shape will keep the same.
polygonShape PolygonShape
The polygon shape will be removed one vertex.
Returns¶
Boolean
If remove sucess it will return true, otherwise return false.
RemoveVertex(Vertex)¶
This method removes the selected vertex from polygon shape.
public bool RemoveVertex(Vertex selectedVertex)
Parameters¶
selectedVertex Vertex
The selected vertex must be a vertex of polygon shape, otherwise it will return false and polygon shape will keep the same.
Returns¶
Boolean
If remove sucess it will return true, otherwise return false.
ToMultiLineShape()¶
public MultilineShape ToMultiLineShape()
Returns¶
Scale(Double)¶
internal void Scale(double multiplicator)
Parameters¶
multiplicator Double
ToLineShapes(PolygonShape)¶
internal static MultilineShape ToLineShapes(PolygonShape polygonShape)
Parameters¶
polygonShape PolygonShape
Returns¶
IsSelSelfIntersecting()¶
internal bool IsSelSelfIntersecting()