Documentation of 'jv.geom.PgBndConstraint' Java class
PgBndConstraint ("JavaView Reference Manual")
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"JavaView? v5.03.003"
jv.geom

Class PgBndConstraint

  • All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable, PsUpdateIf

    public class PgBndConstraint
extends PsObject
    Descriptor for boundary constraints used in variational problems. The member variables have different meanings depending on the shape of the boundary curve. The following describes their meaning and shows how to generate a curve for given constraints. 
    
        if (hasShape(FIX_STRAIGHT)) {
           // m_start     = start point on line;
    // m_end       = end point on line;
    // m_dir       = unit length direction of line;
    // To compute the line:
    for (j=0; j<bndLen; j++) {
       v = (double)j / (double)(bndLen-1.);
       m_vertex[j].blend(1.-v, p, v, q);
    }
    // To constrain the line:
    for (j=0; j<bndLen; j++) {
       m_vertex[j].projectPointToLine(m_vertex[j], m_start, m_dir);
    }
        } else if (hasShape(FIX_PLANE)) {
    // m_start     = start point of planar curve;
    // m_end       = end point of planar curve;
    // m_dir       = unit length normal of plane;
    // m_startDir  = direction along m_start may vary;
    // m_endDir    = direction along m_end may vary;
    // m_startDir and m_endDir are addtn'l contraints depending on the adjacent boundaries
    // Each vector determines a line along which the corresponding start and end point
    // is allowed to vary. This is used if either of the two adjacent boundary curves
    // is of type FIX_PLANE too.
    // Both vectors might be null if boundary curve is closed.
    // To compute the plane:
    // To constrain the line:
    for (j=0; j<bndLen; j++) {
       m_vertex[j].projectPointToPlane(m_vertex[j], m_start, m_dir);
    }
        } else if (hasShape(FIX_CIRCLE)) {
    // m_start     = start point on circle;
    // m_end       = end point on circle;
    // m_vec1      = mid point of circle;
    // m_vec2      = orient, i.e. normal of circle;
    // To compute the circle:
    for (j=0; j<bndLen; j++) {
       v = (double)j / (double)(bndLen-1.);
       m_vertex[j].evalCircle(mid, orient, start, end, v);
    }
    // To constrain the circle:
    radius = m_vec1.dist(m_start);
    for (j=0; j<bndLen; j++) {
       m_vertex[j].projectPointToCircle(m_vertex[j], m_vec1, m_vec2, radius);
    }
        } else if (hasShape(FIX_HELIX)) {
    // m_start     = start point on helix;
    // m_end       = end point on helix;
    // m_vec1      = axis bottom of helix;
    // m_vec2      = axis direction of helix;
    // To compute the helix:
    for (j=0; j<bndLen; j++) {
       v = (double)j / (double)(bndLen-1.);
       m_vertex[j].evalHelix(bot, axisDir, start, end, v);
    }
        else if (m_bndShapeBits[anInd].get(PgBndConstraint.FIX_SPLINE)) {
    // m_start     = start point on spline;
    // m_end       = end point on spline;
    // m_vec1      = tangent of spline at start point;
    // m_vec2      = tangent of spline at end point;
    // To compute the spline:
    for (j=0; j<bndLen; j++) {
       v = (double)j / (double)(bndLen-1.);
       m_vertex[j].evalSpline(m_vec1, m_vec2, m_start, m_end, v);
    }
        }
    See Also:
    Serialized Form
    Author:
    Konrad Polthier
    Version:
    12.03.02, 1.60 revised (kp) Allow startDir and endDir to be null.
    28.08.98, 1.50 revised (kp) Direct access to instance variables reduced.
    16.09.98, 1.00 created (kp)

    • Field Detail

      • FIX_CURVE

        public static final int FIX_CURVE
        Vertices are fixed, i.e. Dirichlet conditions.
        See Also:
        Constant Field Values

      • FIX_STRAIGHT

        public static final int FIX_STRAIGHT
        Vertices are constrained to a straight line.
        See Also:
        Constant Field Values

      • FIX_PLANE

        public static final int FIX_PLANE
        Vertices are constrained to a plane.
        See Also:
        Constant Field Values

      • FIX_THREAD

        public static final int FIX_THREAD
        Distance between vertices is fixed, i.e. the thread of constant length.
        See Also:
        Constant Field Values

      • FIX_CIRCLE

        public static final int FIX_CIRCLE
        Vertices are constrained to lie on a circle. Not yet supported by *bd files and JavaView.
        See Also:
        Constant Field Values

      • FIX_HELIX

        public static final int FIX_HELIX
        Vertices are constrained to lie on a helix. Not yet supported by *bd files and JavaView.
        See Also:
        Constant Field Values

      • FIX_POLYGON

        public static final int FIX_POLYGON
        Vertices are constrained to lie on a polygon. Not yet supported by *bd files and JavaView.
        See Also:
        Constant Field Values

      • m_start

        public PdVector m_start
        Start point of boundary, first vertex.

      • m_end

        public PdVector m_end
        End point of boundary, last vertex.

      • m_vec1

        public PdVector m_vec1
        Additional control vertex, meaning depends on current shape.

      • m_vec2

        public PdVector m_vec2
        Additional control vertex, meaning depends on current shape.

      • m_dir

        public PdVector m_dir
        Unit direction of constraining line or unit normal of constraining plane.

      • m_startDir

        public PdVector m_startDir
        Special constraint for the first point of boundary, for example, two adjacent planar curves force the common vertex to lie on the straight line along which both plane intersect. If this instance variable is null, then there is no constraint.

      • m_endDir

        public PdVector m_endDir
        Special constraint for the last point of boundary, for example, two adjacent planar curves force the common vertex to lie on the straight line along which both plane intersect. If this instance variable is null, then there is no constraint.

    • Constructor Detail

      • PgBndConstraint

        public PgBndConstraint(int dim)

    • Method Detail

      • init

        public void init()
        Initializes and resets instance.
        Overrides:
        init in class PsObject

      • clone

        public java.lang.Object clone()
        Duplicate geometry by recursively cloning all instance variables except inspector panels and lists of registered listeners. The parent relationship is maintained only within this class but not to external classes. In general, all links of the clone to external objects are set to null.

        Display list is not cloned but set to null. Method menu is cloned.

        Overrides:
        clone in class PsObject
        See Also:
        copy(PsObject)
        Version:
        21.10.00, 1.10 revised (kp) Missing cloning of method menu added.
        05.07.00, 1.00 created (kp)

      • copy

        public void copy(PsObject object)
        Copy argument object into this object by recursively copying all instance variables.
        Overrides:
        copy in class PsObject
        See Also:
        PsObject.clone()

      • applyModelingMatrix

        public boolean applyModelingMatrix(PdMatrix modelMatrix)
        Multiply the modeling matrix to all vertices and vectors. The modeling matrix of this geometry is set to the identity matrix.
        Returns:
        true if operation was applied successfully.
        Since:
        JavaView 2.36
        Version:
        04.09.02, 1.00 created (kp)

      • clearShape

        public void clearShape(int aBit)
        Remove shape constraint. For possible shapes see PgBndConstraint.

      • hasShape

        public boolean hasShape(int aBit)
        Check whether shape constraint is set. For possible shapes see PgBndConstraint.

      • setShape

        public void setShape(int aBit)
        Set shape constraint. For possible shapes see PgBndConstraint.

      • setShape

        public void setShape(java.util.BitSet shape)
        Set shape constraint. If possible assign individual bits using setShape(int).
        See Also:
        setShape(int)

      • toString

        public java.lang.String toString()
        Create a multi-line string representation with detailed information about all instance variables.
        Overrides:
        toString in class PsObject

      • getDim

        public int getDim()
        Get dim of vertex constraints.
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