Coordinate2D Constructor(Double,Double)

In This Topic

Represents a Coordinate2D with an X and Y value.

Syntax

C#
Visual Basic (Declaration)

public Coordinate2D( 
   double x,
   double y
)

Public Function New( _
   ByVal x As Double, _
   ByVal y As Double _
)

Parameters

x: X value. This is longitude when working with geographic coordinates.
y: Y value. This is latitude when working with geographic coordinates.

Example

2D Vector Operations

Coordinate2D v = new Coordinate2D(0, 1);
// v.Magnitude = 1

Coordinate2D other = new Coordinate2D(-1, 0);
double dotProduct = v.DotProduct(other);
// dotProduct = 0

Coordinate2D w = v + other;
// w = (-1, 1)

w += other;
// w = (-2, 1)

w -= other;
// w = (-1, 1)

w = v;
w.Rotate(Math.PI, other);
// w = (-2, -1)

w = other;

w.Scale(-4);
// w = (4, 0)
// w.Magnitude = 4

w.Move(-1, 4);
// w = (3, 4)
// w.Magnitude = 5

w.Move(-6, -1);
Tuple<double, double> components = w.QueryComponents();
// components = (-3, 3)
// w.Magnitude = 3 * Math.Sqrt(2)

Coordinate2D unitVector = w.GetUnitVector();
// w = (-Math.Sqrt(2) / 2, Math.Sqrt(2) / 2)
// w.Magnitude = 1


w.SetComponents(3, 4);

Build a donut polygon

List<Coordinate2D> outerCoordinates = new List<Coordinate2D>();
outerCoordinates.Add(new Coordinate2D(10.0, 10.0));
outerCoordinates.Add(new Coordinate2D(10.0, 20.0));
outerCoordinates.Add(new Coordinate2D(20.0, 20.0));
outerCoordinates.Add(new Coordinate2D(20.0, 10.0));

// define the inner polygon as anti-clockwise
List<Coordinate2D> innerCoordinates = new List<Coordinate2D>();
innerCoordinates.Add(new Coordinate2D(13.0, 13.0));
innerCoordinates.Add(new Coordinate2D(17.0, 13.0));
innerCoordinates.Add(new Coordinate2D(17.0, 17.0));
innerCoordinates.Add(new Coordinate2D(13.0, 17.0));

PolygonBuilderEx pbEx = new PolygonBuilderEx(outerCoordinates);
Polygon donutEx = pbEx.ToGeometry() as Polygon;
double areaEx = donutEx.Area;       // area = 100

pbEx.AddPart(innerCoordinates);
donutEx = pbEx.ToGeometry() as Polygon;

areaEx = donutEx.Area;    // area = 84.0

areaEx = GeometryEngine.Instance.Area(donutEx);    // area = 84.0

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

Coordinate2D Structure
Coordinate2D Members
Overload List

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