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Line2d.md

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Line2d Struct

Overview

The Line2d struct represents an unbounded line in 2D space (XY plane), defined by a point and a direction vector.

Namespace

Autodesk.AutoCAD.Geometry

Key Properties

Property Type Description
Point Point2d Gets a point on the line
Direction Vector2d Gets the direction vector of the line

Constructors

Constructor Description
Line2d(Point2d, Vector2d) Creates line from point and direction
Line2d(Point2d, Point2d) Creates line through two points

Key Methods

Method Return Type Description
GetClosestPointTo(Point2d) Point2d Gets closest point on line to given point
DistanceTo(Point2d) double Gets distance from point to line
IsOn(Point2d) bool Checks if point is on line
IsParallelTo(Line2d) bool Checks if parallel to another line
IsPerpendicularTo(Line2d) bool Checks if perpendicular to another line
IntersectWith(Line2d) Point2d Gets intersection point with another line

Code Examples

Example 1: Creating 2D Lines

Point2d pt1 = new Point2d(0, 0);
Point2d pt2 = new Point2d(10, 10);
Line2d line = new Line2d(pt1, pt2);

ed.WriteMessage($"\nLine direction: {line.Direction}");

Example 2: Point-to-Line Distance

Line2d line = new Line2d(new Point2d(0, 0), new Point2d(10, 0));
Point2d testPoint = new Point2d(5, 5);

double distance = line.DistanceTo(testPoint);
Point2d closestPoint = line.GetClosestPointTo(testPoint);

ed.WriteMessage($"\nDistance: {distance:F2}");
ed.WriteMessage($"\nClosest point: ({closestPoint.X:F2}, {closestPoint.Y:F2})");

Related Classes

  • LineSegment2d - Bounded 2D line segment
  • Point2d - 2D points
  • Vector2d - 2D direction vector
  • Line3d - 3D unbounded line

References