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java.lang.Object y.geom.YVector
public class YVector
This class represents a vector in the 2dimensional real vector space. This vector is an ordered 2 tuple and is defined by two doubles.
Constructor Summary  

YVector(double dx,
double dy)
Creates a new vector with given direction. 

YVector(double x1,
double y1,
double x2,
double y2)
Creates a new vector, whose direction is given by two points. 

YVector(YPoint p1)
Creates a new vector, whose direction is given by a point. 

YVector(YPoint p1,
YPoint p2)
Creates a new vector, whose direction is given by two points. 

YVector(YVector v)
Creates a new vector which is a copy of another vector. 
Method Summary  

static YPoint 
add(YPoint p,
YVector v)
Adds the vector to a point and returns the resulting point. 
void 
add(YVector v)
Adds a vector to this vector. 
static YVector 
add(YVector v,
YVector w)
Adds two vectors and returns the result. 
static double 
addAngle(double a1,
double a2)
Returns the result of the addition of two angles between 0 and 2*Pi . 
static double 
angle(YVector v1,
YVector v2)
Returns the angle (measured in radians) between two vectors in clockwise order (with regards to screen coordinates) from v1 to v2. 
static YVector 
getNormal(YVector v)
Returns this vector with unit length. 
double 
getX()
Returns the first coordinate of the vector. 
double 
getY()
Returns the second coordinate of the vector. 
double 
length()
Returns the length of the vector, this is the value of the euclidean norm. 
void 
norm()
Assigns unit length to the vector. 
static YVector 
orthoNormal(YVector v)
Returns the vector which is orthogonal to the given one and has unit length. 
static boolean 
rightOf(YVector v1,
YVector v2)
Returns true if vector v1 is on the right side of v2. 
YVector 
rotate(double angle)
Returns a new YVector instance that is obtained by rotating
this vector by the given angle (measured in radians) in clockwise
direction (with regards to screen coordinates). 
static double 
scalarProduct(YVector v1,
YVector v2)
Returns the value of the scalar product of two vectors. 
void 
scale(double factor)
Scales the vector by an factor. 
java.lang.String 
toString()
Returns a string representation of this vector. 
Methods inherited from class java.lang.Object 

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

public YVector(double dx, double dy)
dx
 the first coordinatedy
 the second coordinatepublic YVector(YVector v)
v
 the vector, whose values are copied.public YVector(YPoint p1, YPoint p2)
p1
 p2
.
p1
 the first point.p2
 the second point.public YVector(YPoint p1)
p1
 (0,0).
p1
 the point.public YVector(double x1, double y1, double x2, double y2)
(x1  x2, y1  y2)
.
x1
 the Xcoordinate of the first point.y1
 the Ycoordinate of the first point.x2
 the Xcoordinate of the second point.y2
 the Ycoordinate of the second point.Method Detail 

public double getX()
public double getY()
public void norm()
public YVector rotate(double angle)
YVector
instance that is obtained by rotating
this vector by the given angle (measured in radians) in clockwise
direction (with regards to screen coordinates).
Screen coordinates mean positive xdirection is from left to right and
positive ydirection is from top to bottom:
0 > 1  v 1
angle
 the angle of rotation in radians.
public void add(YVector v)
v
 the vector to add.public static YVector add(YVector v, YVector w)
v
 first vector to sum.w
 second vector to sum.
public static YPoint add(YPoint p, YVector v)
p
 a point.v
 the vector to add to the point.
public void scale(double factor)
factor
 the scale factor, with which the length is multiplied.public double length()
public static boolean rightOf(YVector v1, YVector v2)
public static YVector getNormal(YVector v)
public static YVector orthoNormal(YVector v)
v
 a vector.
public static double scalarProduct(YVector v1, YVector v2)
v1
 the first vector.v2
 the second vector.
v1.x * v2.x + v1.y * v2.y
public static double angle(YVector v1, YVector v2)
0 > 1  v 1
public static double addAngle(double a1, double a2)
0
and 2*Pi
. The result is calculated modulo 2*Pi
.
a1
 a value in [0,2Pi)
.a2
 a value in [0,2Pi)
.
2*Pi
.public java.lang.String toString()
toString
in class java.lang.Object

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