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# ipe::Line Class Reference
Ipe Geometry

A directed line. More...

`#include <ipegeo.h>`

List of all members.

## Public Member Functions

- Line ()
- Line (const Vector &p, const Vector &dir)
- double side (const Vector &p) const
- Vector normal () const
- double distance (const Vector &v) const
- bool intersects (const Line &line, Vector &pt)
- Vector project (const Vector &v) const
- Vector dir () const

## Static Public Member Functions

- static Line through (const Vector &p, const Vector &q)

## Public Attributes

- Vector iP

## Detailed Description

A directed line.

## Constructor & Destructor Documentation

ipe::Line::Line | ( |  | ) | `[inline, explicit]`

Create default line (x-axis).

Line::Line | ( | const Vector & | p,
|  | const Vector & | dir
| ) |  | `[explicit]`

Construct a line from p with direction dir.

Asserts unit length of dir.

## Member Function Documentation

Line Line::through | ( | const Vector & | p,
|  | const Vector & | q
| ) |  | `[static]`

Construct a line through two points.

double Line::side | ( | const Vector & | p | ) | const

Result is > 0, = 0, < 0 if point lies to the left, on, to the right.

Vector ipe::Line::normal | ( |  | ) | const`[inline]`

Return a normal vector pointing to the left of the directed line.

double Line::distance | ( | const Vector & | v | ) | const

Returns distance between line and v.

bool Line::intersects | ( | const Line & | line,
|  | Vector & | pt
| ) |  |

Does this line intersect line? If so, computes intersection point.

Vector Line::project | ( | const Vector & | v | ) | const

Orthogonally project point v onto the line.

Vector ipe::Line::dir | ( |  | ) | const`[inline]`

Return direction of line.

## Member Data Documentation

Vector ipe::Line::iP

Point on the line.

The documentation for this class was generated from the following files:

- ipegeo.h
- ipegeo.cpp