Class: Vertex

jsts.triangulate.quadedge.Vertex

new Vertex()

Models a site (node) in a QuadEdgeSubdivision. The sites can be points on a lineString representing a linear site. The vertex can be considered as a vector with a norm, length, inner product, cross product, etc. Additionally, point relations (e.g., is a point to the left of a line, the circle defined by this point and two others, etc.) are also defined in this class. Initializes a new Vertex. Will call the correct init* -function based on arguments
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Members

(static) BEHIND

BEHIND The integer representing behind
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(static) BETWEEN

BETWEEN The integer representing between
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(static) BEYOND

BEYOND The integer representing beyond
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(static) DESTINATION

DESTINATION The integer representing destination
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(static) LEFT

LEFT The integer representing left
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(static) ORIGIN

ORIGIN The integer representing origin
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(static) RIGHT

RIGHT The integer representing right
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Methods

bisector(a, b) → {jsts.algorithm.HCoordinate}

Returns the perpendicular bisector of the line between the input vertices
Parameters:
Name Type Description
a jsts.triangulate.quadedge.Vertex A vertex.
b jsts.triangulate.quadedge.Vertex A vertex.
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Returns:
The bisector.
Type
jsts.algorithm.HCoordinate

circleCenter(b, c) → {jsts.triangulate.quadedge.Vertex}

Computes the centre of the circumcircle of this vertex and two others.
Parameters:
Name Type Description
b jsts.triangulate.quadedge.Vertex a vertex.
c jsts.triangulate.quadedge.Vertex a vertex.
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Returns:
the Coordinate which is the circumcircle of the 3 points.
Type
jsts.triangulate.quadedge.Vertex

circumRadiusRatio(b, c) → {Number}

Computes the value of the ratio of the circumradius to shortest edge. If smaller than some given tolerance B, the associated triangle is considered skinny. For an equal lateral triangle this value is 0.57735. The ratio is related to the minimum triangle angle theta by: circumRadius/shortestEdge = 1/(2sin(theta)).
Parameters:
Name Type Description
b jsts.triangulate.quadedge second vertex of the triangle.
c jsts.triangulate.quadedge third vertex of the triangle.
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Returns:
ratio of circumradius to shortest edge.
Type
Number

classify(p0, p1) → {Number}

Clasifys a vertex with respect to another vertex
Parameters:
Name Type Description
p0 jsts.triangulate.quadedge.Vertex The first vertex.
p1 jsts.triangulate.quadedge.Vertex The second vertex.
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Returns:
The classification.
Type
Number

cross() → {jsts.triangulate.quadedge.Vertex}

Returns k X v (cross product). This is a vector perpendicular to v.
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Returns:
A perpendicular vertex to this vertex.
Type
jsts.triangulate.quadedge.Vertex

crossProduct(v) → {Number}

Computes the cross product k = u X v.
Parameters:
Name Type Description
v jsts.triangulate.quadedge.Vertex a vertex.
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Returns:
The magnitude of u X v.
Type
Number

distance(v1, v2) → {Number}

Calculates the distance between two vertices
Parameters:
Name Type Description
v1 jsts.triangulate.quadedge.Vertex a vertex.
v2 jsts.triangulate.quadedge.Vertex a vertex.
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Returns:
The distance.
Type
Number

dot(v) → {Number}

Computes the inner or dot product
Parameters:
Name Type Description
v jsts.triangulate.quadedge.Vertex a vertex.
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Returns:
The dot product u.v.
Type
Number

equals() → {Boolean}

Checks if this vertex is identical to another vertex. Calls correct equals* function based on arguments
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Returns:
true if the vertex equals eachother.
Type
Boolean

equalsExact(other) → {Boolean}

Checks if this vertex is identical to other
Parameters:
Name Type Description
other jsts.triangulate.quadedge.Vertex The vertex to compare this vertex to.
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Returns:
true if this vertex equals other.
Type
Boolean

equalsWithTolerance(other, tolerance) → {Boolean}

Checks if this vertex is identical to other with respect to a tolerance
Parameters:
Name Type Description
other jsts.triangulate.quadedge.Vertex The vertex to compare this vertex to.
tolerance Number The tolerance to consider when comparing the two vertexes.
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Returns:
true if this vertex equals other.
Type
Boolean

getCoordinate() → {jsts.geom.Coordinate}

Gets the coordinate of the vertex
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Returns:
The coordinate.
Type
jsts.geom.Coordinate

getX() → {Number}

Gets the X-coordinate
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Returns:
The X-coordinate.
Type
Number

getY() → {Number}

Gets the Y-coordinate
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Returns:
The Y-coordinate.
Type
Number

getZ() → {Number}

Gets the Z-coordinate
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Returns:
The Z-coordinate.
Type
Number

initFromCoordinate(_p)

Initializes a new Vertex
Parameters:
Name Type Description
_p jsts.geom.Coordinate the coordinate to initialize the vertex from.
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initFromXY(x, y)

Initializes a new Vertex
Parameters:
Name Type Description
x Number the X-coordinate.
y Number the Y-coordinate.
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isCCW(b, c) → {Boolean}

Tests whether the triangle formed by this vertex and two other vertices is in CCW orientation.
Parameters:
Name Type Description
b jsts.triangulate.quadedge.Vertex a vertex.
c jsts.triangulate.quadedge.Vertex a vertex.
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Returns:
true if the triangle is oriented CCW.
Type
Boolean

isInCircle(a, b, c) → {Boolean}

Checks if this vertex lies in the circle defined by a, b and c
Parameters:
Name Type Description
a jsts.triangulate.quadedge.Vertex A vertex.
b jsts.triangulate.quadedge.Vertex A vertex.
c jsts.triangulate.quadedge.Vertex A vertex.
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Returns:
true if this vertex lies in the circle.
Type
Boolean

leftOf(e) → {Boolean}

Tests wheter this vertex lies to the left of an edge
Parameters:
Name Type Description
e jsts.triangulate.quadedge.QuadEdge A quadedge.
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Returns:
true if this vertex lies to the left of the edge.
Type
Boolean

magn() → {Number}

Computes the magnitude.
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Returns:
The magnitude of this vertex.
Type
Number

midPoint(a) → {jsts.triangulate.quadedge.Vertex}

returns a new vertex that is mid-way between this vertex and another end point.
Parameters:
Name Type Description
a jsts.triangulate.quadedge.Vertex the other end point.
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Returns:
the point mid-way between this and that.
Type
jsts.triangulate.quadedge.Vertex

rightOf(e) → {Boolean}

Tests wheter this vertex lies to the right of an edge
Parameters:
Name Type Description
e jsts.triangulate.quadedge.QuadEdge A quadedge.
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Returns:
true if this vertex lies to the right of the edge.
Type
Boolean

setZ(z)

Sets the Z-coordinate
Parameters:
Name Type Description
z Number the new z-coordinate.
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sub(v) → {jsts.triangulate.quadedge.Vertex}

Computes the substraction of vectors.
Parameters:
Name Type Description
v jsts.triangulate.quadedge.Vertex Another vertex.
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Returns:
The substraction of v from this.
Type
jsts.triangulate.quadedge.Vertex

sum(v) → {jsts.triangulate.quadedge.Vertex}

Computes the sum of vectors.
Parameters:
Name Type Description
v jsts.triangulate.quadedge.Vertex Another vertex.
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Returns:
The sum of the this and v.
Type
jsts.triangulate.quadedge.Vertex

times(c) → {jsts.triangulate.quadedge.Vertex}

Computes the scalar product c(v).
Parameters:
Name Type Description
c Number The scalar.
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Returns:
The scaled vector.
Type
jsts.triangulate.quadedge.Vertex

toString() → {String}

Gets the string representation of the vertex
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Returns:
The string representing the vertex.
Type
String