sbsu1.c File Reference


Detailed Description

sample points

=====================================================
Liste_Funktionen_Beginn:

UT3D_pt_cisn               evaluate sample-point on circle
UT3D_pt_elsn               evaluate sample-point on ellipse
UT3D_pt_lnsn               evaluate sample-point on line
UT3D_pt_midnpt             center point <-- points
UT3D_pt_sampnr             evaluate sample-curve-point
UT3D_vc_tgsampnr           evaluate sample-tangent-vector

u3d_LinComb2Pts            po = a1 * p1 + a2 * p2

Liste_Funktionen_Ende:
=====================================================

#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "../ut/ut_geo.h"

Functions

int UT3D_pt_sampnr (Point *po, void *cv, int cvtype, int np, int sn)
int UT3D_vc_tgsampnr (Vector *tg, void *cv, int cvtype, Point *ps, int np, int sn)
int UT3D_pt_lnsn (Point *po, Line *ln, int np, int sn)
int UT3D_pt_cisn (Point *po, Circ *ci, int np, int sn)
int UT3D_pt_elsn (Point *po, CurvElli *el, int np, int sn)


Function Documentation

int UT3D_pt_sampnr ( Point po,
void *  cv,
int  cvtype,
int  np,
int  sn 
)

    UT3D_pt_sampnr     evaluate sample-curve-point (teilen)
    
    Evaluate a point on a curve (line, circle, ellipse, b-spline,...)
    with a sample-number.
    From the sample-number the curve-parameter t follows by
    t = a + sn * (b-a)/np, where [a,b] is the support of the curve.
    
    IN:
      void *cv     ... curve
      int cvtype   ... type of curve
      int np       ... number of point-positions on curve (without endpoint)
      int sn       ... sample-number of point to evaluate (0 <= sn <= np)
    OUT:
      Point *po    ... evaluated point
    Returncodes:
      0 = OK
     -1 = internal error
     -2 = input error

int UT3D_vc_tgsampnr ( Vector tg,
void *  cv,
int  cvtype,
Point ps,
int  np,
int  sn 
)

    UT3D_vc_tgsampnr     evaluate sample-tangent-vector (teilen)
    
    Evaluate the tangent-vector in a point on a curve
    (line, circle, ellipse, b-spline,...) with a sample-number.
    From the sample-number the curve-parameter t follows by
    t = a + sn * (b-a)/np, where [a,b] is the support of the curve.
    
    IN:
      void *cv     ... curve
      int cvtype   ... type of curve
      Point *ps    ... curve-point with sample-number sn
      int np       ... number of sample-points on curve (without endpoint)
      int sn       ... sample-number of position of tangent (0 <= sn <= np)
    OUT:
      Vector *tg   ... tangent vector (not normalized)
    Returncodes:
      0 = OK
     -1 = input error

int UT3D_pt_lnsn ( Point po,
Line ln,
int  np,
int  sn 
)

    UT3D_pt_lnsn     evaluate sample-point on line (teilen)
    
    Evaluate a point on a 3D-line by a sample-number.
    The sample-number is the number of the point between ln->p1 and ln->p2
    in relation to the total number of sample-points.
    
    IN:
      Line *ln     ... 3D-line
      int np       ... total number of sample-points (without ci->p2)
      int sn       ... sample-number of point to evaluate (0 <= sn <= np)
    OUT:
      Point *po    ... evaluated point
    Returncodes:
      0 = OK
     -1 = input error

int UT3D_pt_cisn ( Point po,
Circ ci,
int  np,
int  sn 
)

    UT3D_pt_cisn     evaluate sample-point on circle (teilen)
    
    Evaluate a point on a 3D-circle by a sample-number.
    The sample-number is the number of the point between ci->p1 and ci->p2
    in relation to the total number of sample-points.
    
    IN:
      Circ *ci     ... 3D-circle
      int np       ... total number of sample-points (without ci->p2)
      int sn       ... sample-number of point to evaluate (0 <= sn <= np)
    OUT:
      Point *po    ... evaluated point
    Returncodes:
      0 = OK
     -1 = input error

int UT3D_pt_elsn ( Point po,
CurvElli el,
int  np,
int  sn 
)

    UT3D_pt_elsn     evaluate sample-point on ellipse (teilen)
    
    Evaluate a point on a 3D-ellipse by a sample-number.
    The sample-number is the number of the point between el->p1 and el->p2
    in relation to the total number of sample-points.
    
    IN:
      CurvElli *el  ... 3D-ellipse
      int np       ... total number of sample-points (without el->p2)
      int sn       ... sample-number of point to evaluate (0 <= sn <= np)
    OUT:
      Point *po    ... evaluated point
    Returncodes:
      0 = OK
     -1 = internal error


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