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Action:
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Determines a position on a
bs3_curve where a line from a given position is tangent to the curve.
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Prototype:
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logical bs3_curve_tan_pt_crv (
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const SPAposition& point,
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// input start point
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bs3_curve crv,
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// input curve
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const SPAunit_vector& normal,// curve normal
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double* t,
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// curve parameter
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logical old_method
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// solution method
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= FALSE,
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const SPAvector& xa
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// x-axis
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=(*(SPAvector*)NULL_REF),
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const SPAvector& ya
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// y-axis
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=(*(SPAvector*)NULL_REF),
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const SPAposition& guess_pt// input guess point
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=(*(SPAposition*)NULL_REF
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);
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Includes:
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#include "kernel/acis.hxx"
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#include "baseutil/logical.h"
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#include "baseutil/vector/position.hxx"
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#include "baseutil/vector/unitvec.hxx"
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#include "baseutil/vector/vector.hxx"
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#include "kernel/spline/bs3_crv/bs3curve.hxx"
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#include "kernel/spline/sg_bs3c/sps3crtn.hxx"
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Description:
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Determines a position on a
bs3_curve where a line from a given position is tangent to the curve. Uses a guess parameter value to aid the solution (especially where there are multiple solutions).
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Returns
TRUE if the point was computed;
FALSE if no solution was found.
FALSE is preferred as the solution method (do not use the old method). If
old_method is
TRUE, then the
x- and
y-axis values are needed.
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Library:
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kernel
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Filename:
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kern/kernel/spline/sg_bs3c/sps3crtn.hxx
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Effect:
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System routine
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