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/*******************************************************************************
* *
* Viewmol *
* *
* C Y L I N D E R . C *
* *
* Copyright (c) Joerg-R. Hill, December 2000 *
* *
********************************************************************************
*
* $Id: cylinder.c,v 1.5 2000/12/10 15:03:46 jrh Exp $
* $Log: cylinder.c,v $
* Revision 1.5 2000/12/10 15:03:46 jrh
* Release 2.3
*
* Revision 1.4 1999/05/24 01:25:02 jrh
* Release 2.2.1
*
* Revision 1.3 1999/02/07 21:46:18 jrh
* Release 2.2
*
* Revision 1.2 1998/01/26 00:47:17 jrh
* Release 2.1
*
* Revision 1.1 1996/12/10 18:40:09 jrh
* Initial revision
*
*/
#include<math.h>
#include<GL/gl.h>
#include<GL/glu.h>
extern void (*drawCylinder)(GLUquadricObj *, GLdouble, GLdouble, GLdouble, GLint, GLint);
GLdouble buildRotationMatrix(double x, double y, double z, GLdouble tmat[4][4])
{
double height, d, ca, sa, cb, sb;
height=sqrt((double)(x*x + y*y + z*z));
/* Builds the rotation matrix for rotating a vector defined by
the points (0, 0, 0) and (0, 0, height) to the orientation
(x, y, z) */
if ((d=sqrt((double)(x*x + y*y))) != 0.0)
{
ca=y/d;
sa=x/d;
y=x*sa+y*ca;
}
else
{
ca=1.0;
sa=0.0;
}
if ((d=sqrt((double)(y*y + z*z))) != 0.0)
{
cb=z/d;
sb=y/d;
}
else
{
cb=1.0;
sb=0.0;
}
tmat[0][0]=ca;
tmat[1][0]=sa*cb;
tmat[2][0]=sa*sb;
tmat[3][0]=0.0e0;
tmat[0][1]=(-sa);
tmat[1][1]=ca*cb;
tmat[2][1]=ca*sb;
tmat[3][1]=0.0e0;
tmat[0][2]=0.;
tmat[1][2]=(-sb);
tmat[2][2]=cb;
tmat[3][2]=0.0e0;
tmat[0][3]=tmat[1][3]=tmat[2][3]=0.0e0;
tmat[3][3]=1.0e0;
return(height);
}
void cylinder(double x1, double y1, double z1, double x2, double y2, double z2,
double r, int n, GLenum mode)
{
GLUquadricObj *obj;
double vx=x2-x1, vy=y2-y1, vz=z2-z1;
GLdouble tmat[4][4], height;
height=buildRotationMatrix(vx, vy, vz, tmat);
tmat[3][0]=x1;
tmat[3][1]=y1;
tmat[3][2]=z1;
/* Select drawing function depending on mode */
obj=gluNewQuadric();
gluQuadricDrawStyle(obj, mode);
gluQuadricTexture(obj, GL_TRUE);
if (mode == GLU_FILL) gluQuadricNormals(obj, (GLenum)GLU_SMOOTH);
else gluQuadricNormals(obj, (GLenum)GLU_NONE);
glPushMatrix();
glMultMatrixd((GLdouble *)tmat);
(*drawCylinder)(obj, r, r, height, n, 1);
glPopMatrix();
}
void cone(double x1, double y1, double z1, double x2, double y2, double z2,
double rBase, int n)
{
GLUquadricObj *obj;
double vx=x2-x1, vy=y2-y1, vz=z2-z1;
GLdouble tmat[4][4], height;
height=buildRotationMatrix(vx, vy, vz, tmat);
tmat[3][0]=x1;
tmat[3][1]=y1;
tmat[3][2]=z1;
obj=gluNewQuadric();
gluQuadricDrawStyle(obj, (GLenum)GLU_FILL);
gluQuadricNormals(obj, (GLenum)GLU_SMOOTH);
glPushMatrix();
glMultMatrixd((GLdouble *)tmat);
(*drawCylinder)(obj, rBase, 0.0e0, height, n, 1);
glPopMatrix();
}
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