Maven module :un.api : api-geometry :
Class : un.impl.geometry.Geometries
Extends/Implements : -
Subclasses : -

Utilities for geometries.
author Johann Sorel

Variables : -
Functions : calculateNormal, calculateNormal, calculateNormal, calculateCircleCenter, calculatePointSymmetry, calculateAxisSymmetry, isConvex, isOnLine, isAtRightOf, isAtRightOf, isCounterClockwise, isCounterClockwise, lineSide, inCircle, inTriangle, calculatePlanD, projectPointOnPlan, isClockWise, isClockWise, isClockWise, calculateArea, calculateArea, transform, flatten, toTupleBuffer, toTupleBuffer, toTupleArray

Calculate normal of triangle made of given 3 points.
param  a
param  b
param  c
return  normal

public Vector calculateNormal (Tuple a, Tuple b, Tuple c)

Calculate normal of triangle made of given 3 points.
param  a
param  b
param  c
return  normal

public double[] calculateNormal (double[] a, double[] b, double[] c)

Calculate normal of triangle made of given 3 points.
param  a
param  b
param  c
param  buffer
return  normal

public float[] calculateNormal (float[] a, float[] b, float[] c, float[] buffer)

public double[] calculateCircleCenter (double[] a, double[] b, double[] c)

param  c symmetry center
param  p point to reflect
return  reflected point

public double[] calculatePointSymmetry (double[] c, double[] p)

param  a symmetry axis a
param  b symmetry axis b
param  p point to reflect
return  reflected point

public double[] calculateAxisSymmetry (double[] a, double[] b, double[] p)

Test if given a,b,c,d quad is convex.
param  a
param  b
param  c
param  d
return  true if convex, false otherwise.

public boolean isConvex (Tuple a, Tuple b, Tuple c, Tuple d)

Test if the Point p is on the line porting the edge
param  a line origine
param  b line end
param  p Point to test
return  true/false

public boolean isOnLine (Point a, Point b, Point p)

Test if the Point P is at the right of the line A-B.
param  a line origine
param  b line end
param  p Point to test
return  true/false

public boolean isAtRightOf (Point a, Point b, Point p)

Test if the Point P is at the right of the line A-B.
param  a line origine
param  b line end
param  p Point to test
return  true/false

public boolean isAtRightOf (double[] a, double[] b, double[] p)

return true if a, b and c turn in Counter Clockwise direction
param a,b,c the 3 points to test
return true if a, b and c turn in Counter Clockwise direction

public boolean isCounterClockwise (Point a, Point b, Point c)

return true if a, b and c turn in Counter Clockwise direction
param a,b,c the 3 points to test
return true if a, b and c turn in Counter Clockwise direction

public boolean isCounterClockwise (double[] a, double[] b, double[] c)

Test the side of a point compare to a line.

@param a line start
@param b line end
@param c to test
@return > 0 if point is on the left side
= 0 if point is on the line
< 0 if point is on the right side

public double lineSide (double[] a, double[] b, double[] c)

The Delaunay criteria:
test if the point d is inside the circumscribed circle of triangle a,b,c
param  a,b,c triangle
param  d point to test
return  true/false

public boolean inCircle (Point a, Point b, Point c, Point d)

Test if a point is inside given triangle.
param  a
param  b
param  c
param  p
return

public boolean inTriangle (double[] a, double[] b, double[] c, double[] p)

Calculate constant D of a plan.
Same as normal.dot(point).
param normal
param pointOnPlan
return

public double calculatePlanD (double[] normal, double[] pointOnPlan)

Calculate projection of a point on a plan.
param  point point to project
param  planNormal plan normal
param  planD
return  projected point

public double[] projectPointOnPlan (double[] point, double[] planNormal, double planD)

Test if given sequence of tuple is in clockwise direction.
This method expect the coordinates to be a closed line.
param coordinates
return

public boolean isClockWise (Sequence coordinates)

public boolean isClockWise (TupleBuffer1D coordinates)

Test if given path iterator is in clockwise direction.
This method expect the coordinates to be a closed line.
param pathIterator
return true if clockwise

public boolean isClockWise (PathIterator pathIterator)

Test if given sequence of tuple is in clockwise direction.
This method expect the coordinates to be a closed line.
param coordinates
return

public double calculateArea (Sequence coordinates)

Test if given sequence of tuple is in clockwise direction.
This method expect the coordinates to be a closed line.
param coordinates
return

public double calculateArea (TupleBuffer1D coordinates)

public BBox transform (BBox bbox, Matrix trs, BBox buffer)

public Geometry2D flatten (Geometry2D geom, double[] resolution)

public TupleBuffer1D toTupleBuffer (Tuple[] tuples)

public TupleBuffer1D toTupleBuffer (Sequence tuples)

public Tuple[] toTupleArray (TupleBuffer1D buffer)