Point2D (Variable type)

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Properties specific to Point2D variables
Functions that use the Point2D type

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Point2D (Variable type)

In french: Point2D

The Point2D type is used to define all the characteristics of a location represented on a Cartesian plane. This type of point is used to define geometric data that uses 2D coordinates.

When you manipulate geometric data, all geometries use points:

linestrings are made up of a series of connected points,
polygons are made up of linestrings: one linestring defining the exterior ring and other linestrings defining the holes, if any.

Remark: For more details on the declaration of this type of variable and the use of WLanguage properties, see Declaring a variable.

Example

// Declaring a point using 2D coordinates
p is Point2D
p.X = 3
p.Y = 12

// Display the point as a string
Trace(GeometrySerializeWKT(p))
// Displays: "POINT(3 12)"

Properties

Properties specific to Point2D variables

The following properties can be used to manipulate a variable of type Point2D:

Property name	Type used	Effect

Type	Integer constant	Type of the current geometry. For a point defined with 2D coordinates, corresponds to the gtPoint2D constant. Remark: Until version 2024 Update 2, this constant was named stPoint2D. This property is available in read-only.
X	Real	X-coordinate of the point on the Cartesian plane.
Y	Real	Y-coordinate of the point on the Cartesian plane.

Remarks

Functions that use the Point2D type

The following functions use Point2D variables:


GeometryArea	Calculates the area of a given geometry.
GeometryContain	Determines if geometry A contains geometry B.
GeometryConvexHull	Calculates the convex hull of the specified geometry.
GeometryCorrect	Returns a corrected version of the specified geometry.
GeometryCover	Determines if geometry A covers geometry B.
GeometryCoveredBy	Determines if every point of geometry A lies inside or on the boundary of geometry B.
GeometryCross	Compares two geometries and determines if their intersection spatially crosses.
GeometryDifference	Returns a geometry representing the difference between two geometries.
GeometryDisjoint	Determines whether two geometries are disjoint, i.e. whether their intersection is empty.
GeometryDistance	Calculates the distance between two geometries.
GeometryEqual	Determines whether two geometries are spatially equal, i.e. whether the first geometry is included in the second, and vice versa.
GeometryIntersect	Checks whether two geometries have a non-empty intersection.
GeometryIntersection	Returns a geometry representing the intersection of two geometries.
GeometryIsValid	Checks whether the specified geometry is valid according to the OGC rules.
GeometryLength	Calculates the length of a given geometry.
GeometryOverlap	Determines whether two geometries overlap.
GeometryPerimeter	Calculates the perimeter of a given geometry (polygon or multipolygon).
GeometrySerializeDSV	Serializes a geometry using the specified DSV format.
GeometrySerializeWKT	Serializes a geometry using the Well-Known Text (WKT) format.
GeometrySymmetricDifference	Calculates the symmetric difference between two geometries.
GeometryTouch	Determines whether two geometries touch.
GeometryUnion	Returns a geometry corresponding to the union of two geometries.
GeometryWithin	Determines whether geometry A is completely within geometry B (i.e., geometry B completely contains geometry A).