y.geom
Class AffineLine

java.lang.Object
  y.geom.AffineLine

public class AffineLine
extends java.lang.Object

This class represents a line in the 2D-dimensional affine space. The line is defined by the equation ax + by + c = 0

Constructor Summary

AffineLine(YPoint p1, YPoint p2)
Creates an affine line which is defined by two points.

AffineLine(YPoint p1, YVector v)
Creates an affine line which is defined by a point and a vector.

Method Summary

double	getA() Returns a from ax+by+c = 0
double	getB() Returns b from ax+by+c = 0
double	getC() Returns c from ax+by+c = 0
static YPoint	getCrossing(AffineLine l1, AffineLine l2) Returns the crossing of two lines.
YPoint	getXProjection(YPoint p) Projects an point on the line in direction of the X-axis.
YPoint	getYProjection(YPoint p) Projects an point on the line in direction of the Y-axis.
java.lang.String	toString() Returns the equation of the line as String

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

AffineLine

public AffineLine(YPoint p1,
                  YVector v)

Creates an affine line which is defined by a point and a vector.

AffineLine

public AffineLine(YPoint p1,
                  YPoint p2)

Creates an affine line which is defined by two points.

Method Detail

getA

public double getA()

Returns a from ax+by+c = 0

getB

public double getB()

Returns b from ax+by+c = 0

getC

public double getC()

Returns c from ax+by+c = 0

toString

public java.lang.String toString()

Returns the equation of the line as String

Overrides:

toString in class java.lang.Object

getXProjection

public YPoint getXProjection(YPoint p)

Projects an point on the line in direction of the X-axis.

getYProjection

public YPoint getYProjection(YPoint p)

Projects an point on the line in direction of the Y-axis.

getCrossing

public static YPoint getCrossing(AffineLine l1,
                                 AffineLine l2)

Returns the crossing of two lines. If the lines are parallel, null is returned.