* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "../include/GL/freeglut.h"
-
-
+#include <GL/freeglut.h>
#include "freeglut_internal.h"
/*
{
double size = dSize * 0.5;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCube" );
+
# define V(a,b,c) glVertex3d( a size, b size, c size );
# define N(a,b,c) glNormal3d( a, b, c );
- /*
- * PWO: I dared to convert the code to use macros...
- */
+ /* PWO: I dared to convert the code to use macros... */
glBegin( GL_LINE_LOOP ); N( 1.0, 0.0, 0.0); V(+,-,+); V(+,-,-); V(+,+,-); V(+,+,+); glEnd();
glBegin( GL_LINE_LOOP ); N( 0.0, 1.0, 0.0); V(+,+,+); V(+,+,-); V(-,+,-); V(-,+,+); glEnd();
glBegin( GL_LINE_LOOP ); N( 0.0, 0.0, 1.0); V(+,+,+); V(-,+,+); V(-,-,+); V(+,-,+); glEnd();
{
double size = dSize * 0.5;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCube" );
+
# define V(a,b,c) glVertex3d( a size, b size, c size );
# define N(a,b,c) glNormal3d( a, b, c );
- /*
- * PWO: Again, I dared to convert the code to use macros...
- */
+ /* PWO: Again, I dared to convert the code to use macros... */
glBegin( GL_QUADS );
N( 1.0, 0.0, 0.0); V(+,-,+); V(+,-,-); V(+,+,-); V(+,+,+);
N( 0.0, 1.0, 0.0); V(+,+,+); V(+,+,-); V(-,+,-); V(-,+,+);
* The sign of n can be flipped to get the reverse loop
*/
-static void circleTable(double **sint,double **cost,const int n)
+static void fghCircleTable(double **sint,double **cost,const int n)
{
int i;
/* Determine the angle between samples */
- const double angle = 2*M_PI/(double)n;
+ const double angle = 2*M_PI/(double)( ( n == 0 ) ? 1 : n );
/* Allocate memory for n samples, plus duplicate of first entry at the end */
{
free(*sint);
free(*cost);
- fgError("Failed to allocate memory in circleTable");
+ fgError("Failed to allocate memory in fghCircleTable");
}
/* Compute cos and sin around the circle */
- for (i=0; i<size; i++)
+ (*sint)[0] = 0.0;
+ (*cost)[0] = 1.0;
+
+ for (i=1; i<size; i++)
{
(*sint)[i] = sin(angle*i);
(*cost)[i] = cos(angle*i);
double *sint1,*cost1;
double *sint2,*cost2;
- circleTable(&sint1,&cost1,-slices);
- circleTable(&sint2,&cost2,stacks*2);
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSphere" );
+
+ fghCircleTable(&sint1,&cost1,-slices);
+ fghCircleTable(&sint2,&cost2,stacks*2);
/* The top stack is covered with a triangle fan */
z0 = 1.0;
- z1 = cost2[1];
+ z1 = cost2[(stacks>0)?1:0];
r0 = 0.0;
- r1 = sint2[1];
+ r1 = sint2[(stacks>0)?1:0];
glBegin(GL_TRIANGLE_FAN);
glVertex3d(0,0,radius);
for (j=slices; j>=0; j--)
- {
+ {
glNormal3d(cost1[j]*r1, sint1[j]*r1, z1 );
glVertex3d(cost1[j]*r1*radius, sint1[j]*r1*radius, z1*radius);
}
}
/*
- * Draws a solid sphere
+ * Draws a wire sphere
*/
void FGAPIENTRY glutWireSphere(GLdouble radius, GLint slices, GLint stacks)
{
double x,y,z;
/* Pre-computed circle */
-
+
double *sint1,*cost1;
double *sint2,*cost2;
- circleTable(&sint1,&cost1,-slices );
- circleTable(&sint2,&cost2, stacks*2);
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSphere" );
+
+ fghCircleTable(&sint1,&cost1,-slices );
+ fghCircleTable(&sint2,&cost2, stacks*2);
/* Draw a line loop for each stack */
double z0,z1;
double r0,r1;
- const double zStep = height/stacks;
- const double rStep = base/stacks;
+ const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
+ const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
/* Scaling factors for vertex normals */
/* Pre-computed circle */
double *sint,*cost;
- circleTable(&sint,&cost,-slices);
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCone" );
+
+ fghCircleTable(&sint,&cost,-slices);
/* Cover the circular base with a triangle fan... */
double z = 0.0;
double r = base;
- const double zStep = height/stacks;
- const double rStep = base/stacks;
+ const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
+ const double rStep = base / ( ( stacks > 0 ) ? stacks : 1 );
/* Scaling factors for vertex normals */
/* Pre-computed circle */
double *sint,*cost;
- circleTable(&sint,&cost,-slices);
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCone" );
+
+ fghCircleTable(&sint,&cost,-slices);
/* Draw the stacks... */
/* Step in z and radius as stacks are drawn. */
- double z0,z1;
- const double zStep = height/stacks;
+ double z0,z1;
+ const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
/* Pre-computed circle */
double *sint,*cost;
- circleTable(&sint,&cost,-slices);
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidCylinder" );
+
+ fghCircleTable(&sint,&cost,-slices);
/* Cover the base and top */
/*
* Draws a wire cylinder
- */
+ */
void FGAPIENTRY glutWireCylinder(GLdouble radius, GLdouble height, GLint slices, GLint stacks)
{
int i,j;
/* Step in z and radius as stacks are drawn. */
double z = 0.0;
- const double zStep = height/stacks;
+ const double zStep = height / ( ( stacks > 0 ) ? stacks : 1 );
/* Pre-computed circle */
double *sint,*cost;
- circleTable(&sint,&cost,-slices);
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireCylinder" );
+
+ fghCircleTable(&sint,&cost,-slices);
/* Draw the stacks... */
}
/*
- *
+ * Draws a wire torus
*/
void FGAPIENTRY glutWireTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
{
int i, j;
double spsi, cpsi, sphi, cphi ;
- /*
- * Allocate the vertices array
- */
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTorus" );
+
+ if ( nSides < 1 ) nSides = 1;
+ if ( nRings < 1 ) nRings = 1;
+
+ /* Allocate the vertices array */
vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
}
/*
- *
+ * Draws a solid torus
*/
void FGAPIENTRY glutSolidTorus( GLdouble dInnerRadius, GLdouble dOuterRadius, GLint nSides, GLint nRings )
{
int i, j;
double spsi, cpsi, sphi, cphi ;
- /*
- * Increment the number of sides and rings to allow for one more point than surface
- */
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTorus" );
+
+ if ( nSides < 1 ) nSides = 1;
+ if ( nRings < 1 ) nRings = 1;
+
+ /* Increment the number of sides and rings to allow for one more point than surface */
nSides ++ ;
nRings ++ ;
- /*
- * Allocate the vertices array
- */
+ /* Allocate the vertices array */
vertex = (double *)calloc( sizeof(double), 3 * nSides * nRings );
normal = (double *)calloc( sizeof(double), 3 * nSides * nRings );
*/
void FGAPIENTRY glutWireDodecahedron( void )
{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireDodecahedron" );
+
/* Magic Numbers: It is possible to create a dodecahedron by attaching two pentagons to each face of
* of a cube. The coordinates of the points are:
* (+-x,0, z); (+-1, 1, 1); (0, z, x )
- * where x = 0.61803398875 and z = 1.61803398875.
+ * where x = (-1 + sqrt(5))/2, z = (1 + sqrt(5))/2 or
+ * x = 0.61803398875 and z = 1.61803398875.
*/
glBegin ( GL_LINE_LOOP ) ;
glNormal3d ( 0.0, 0.525731112119, 0.850650808354 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
*/
void FGAPIENTRY glutSolidDodecahedron( void )
{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidDodecahedron" );
+
/* Magic Numbers: It is possible to create a dodecahedron by attaching two pentagons to each face of
* of a cube. The coordinates of the points are:
* (+-x,0, z); (+-1, 1, 1); (0, z, x )
- * where x = 0.61803398875 and z = 1.61803398875.
+ * where x = (-1 + sqrt(5))/2, z = (1 + sqrt(5))/2 or
+ * x = 0.61803398875 and z = 1.61803398875.
*/
glBegin ( GL_POLYGON ) ;
glNormal3d ( 0.0, 0.525731112119, 0.850650808354 ) ; glVertex3d ( 0.0, 1.61803398875, 0.61803398875 ) ; glVertex3d ( -1.0, 1.0, 1.0 ) ; glVertex3d ( -0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 0.61803398875, 0.0, 1.61803398875 ) ; glVertex3d ( 1.0, 1.0, 1.0 ) ;
*/
void FGAPIENTRY glutWireOctahedron( void )
{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireOctahedron" );
+
#define RADIUS 1.0f
glBegin( GL_LINE_LOOP );
glNormal3d( 0.577350269189, 0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
+ glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
+ glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
glNormal3d( 0.577350269189,-0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
+ glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
glNormal3d(-0.577350269189, 0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
glNormal3d(-0.577350269189,-0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
+ glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
glEnd();
#undef RADIUS
}
*/
void FGAPIENTRY glutSolidOctahedron( void )
{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidOctahedron" );
+
#define RADIUS 1.0f
glBegin( GL_TRIANGLES );
glNormal3d( 0.577350269189, 0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
+ glNormal3d( 0.577350269189, 0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
+ glNormal3d( 0.577350269189,-0.577350269189, 0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
glNormal3d( 0.577350269189,-0.577350269189,-0.577350269189); glVertex3d( RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
- glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
+ glNormal3d(-0.577350269189, 0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS ); glVertex3d( 0.0, RADIUS, 0.0 );
glNormal3d(-0.577350269189, 0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
glNormal3d(-0.577350269189,-0.577350269189, 0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0, RADIUS );
- glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0,-RADIUS, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS );
+ glNormal3d(-0.577350269189,-0.577350269189,-0.577350269189); glVertex3d(-RADIUS, 0.0, 0.0 ); glVertex3d( 0.0, 0.0,-RADIUS ); glVertex3d( 0.0,-RADIUS, 0.0 );
glEnd();
#undef RADIUS
}
+/* Magic Numbers: r0 = ( 1, 0, 0 )
+ * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
+ * r2 = ( -1/3, -sqrt(2) / 3, sqrt(6) / 3 )
+ * r3 = ( -1/3, -sqrt(2) / 3, -sqrt(6) / 3 )
+ * |r0| = |r1| = |r2| = |r3| = 1
+ * Distance between any two points is 2 sqrt(6) / 3
+ *
+ * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
+ */
+
+#define NUM_TETR_FACES 4
+
+static GLdouble tet_r[4][3] = { { 1.0, 0.0, 0.0 },
+ { -0.333333333333, 0.942809041582, 0.0 },
+ { -0.333333333333, -0.471404520791, 0.816496580928 },
+ { -0.333333333333, -0.471404520791, -0.816496580928 } } ;
+
+static GLint tet_i[4][3] = /* Vertex indices */
+{
+ { 1, 3, 2 }, { 0, 2, 3 }, { 0, 3, 1 }, { 0, 1, 2 }
+} ;
+
/*
*
*/
void FGAPIENTRY glutWireTetrahedron( void )
{
- /* Magic Numbers: r0 = ( 1, 0, 0 )
- * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
- * r2 = ( -1/3, -sqrt(2) / 3, sqrt(6) / 3 )
- * r3 = ( -1/3, -sqrt(2) / 3, -sqrt(6) / 3 )
- * |r0| = |r1| = |r2| = |r3| = 1
- * Distance between any two points is 2 sqrt(6) / 3
- *
- * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
- */
-
- double r0[3] = { 1.0, 0.0, 0.0 } ;
- double r1[3] = { -0.333333333333, 0.942809041582, 0.0 } ;
- double r2[3] = { -0.333333333333, -0.471404520791, 0.816496580928 } ;
- double r3[3] = { -0.333333333333, -0.471404520791, -0.816496580928 } ;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireTetrahedron" );
glBegin( GL_LINE_LOOP ) ;
- glNormal3d ( -1.0, 0.0, 0.0 ) ; glVertex3dv ( r1 ) ; glVertex3dv ( r3 ) ; glVertex3dv ( r2 ) ;
- glNormal3d ( 0.333333333333, -0.942809041582, 0.0 ) ; glVertex3dv ( r0 ) ; glVertex3dv ( r2 ) ; glVertex3dv ( r3 ) ;
- glNormal3d ( 0.333333333333, 0.471404520791, -0.816496580928 ) ; glVertex3dv ( r0 ) ; glVertex3dv ( r3 ) ; glVertex3dv ( r1 ) ;
- glNormal3d ( 0.333333333333, 0.471404520791, 0.816496580928 ) ; glVertex3dv ( r0 ) ; glVertex3dv ( r1 ) ; glVertex3dv ( r2 ) ;
+ glNormal3d ( -tet_r[0][0], -tet_r[0][1], -tet_r[0][2] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[2] ) ;
+ glNormal3d ( -tet_r[1][0], -tet_r[1][1], -tet_r[1][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[2] ) ; glVertex3dv ( tet_r[3] ) ;
+ glNormal3d ( -tet_r[2][0], -tet_r[2][1], -tet_r[2][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[1] ) ;
+ glNormal3d ( -tet_r[3][0], -tet_r[3][1], -tet_r[3][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[2] ) ;
glEnd() ;
}
*/
void FGAPIENTRY glutSolidTetrahedron( void )
{
- /* Magic Numbers: r0 = ( 1, 0, 0 )
- * r1 = ( -1/3, 2 sqrt(2) / 3, 0 )
- * r2 = ( -1/3, -sqrt(2) / 3, sqrt(6) / 3 )
- * r3 = ( -1/3, -sqrt(2) / 3, -sqrt(6) / 3 )
- * |r0| = |r1| = |r2| = |r3| = 1
- * Distance between any two points is 2 sqrt(6) / 3
- *
- * Normals: The unit normals are simply the negative of the coordinates of the point not on the surface.
- */
-
- double r0[3] = { 1.0, 0.0, 0.0 } ;
- double r1[3] = { -0.333333333333, 0.942809041582, 0.0 } ;
- double r2[3] = { -0.333333333333, -0.471404520791, 0.816496580928 } ;
- double r3[3] = { -0.333333333333, -0.471404520791, -0.816496580928 } ;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidTetrahedron" );
glBegin( GL_TRIANGLES ) ;
- glNormal3d ( -1.0, 0.0, 0.0 ) ; glVertex3dv ( r1 ) ; glVertex3dv ( r3 ) ; glVertex3dv ( r2 ) ;
- glNormal3d ( 0.333333333333, -0.942809041582, 0.0 ) ; glVertex3dv ( r0 ) ; glVertex3dv ( r2 ) ; glVertex3dv ( r3 ) ;
- glNormal3d ( 0.333333333333, 0.471404520791, -0.816496580928 ) ; glVertex3dv ( r0 ) ; glVertex3dv ( r3 ) ; glVertex3dv ( r1 ) ;
- glNormal3d ( 0.333333333333, 0.471404520791, 0.816496580928 ) ; glVertex3dv ( r0 ) ; glVertex3dv ( r1 ) ; glVertex3dv ( r2 ) ;
+ glNormal3d ( -tet_r[0][0], -tet_r[0][1], -tet_r[0][2] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[2] ) ;
+ glNormal3d ( -tet_r[1][0], -tet_r[1][1], -tet_r[1][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[2] ) ; glVertex3dv ( tet_r[3] ) ;
+ glNormal3d ( -tet_r[2][0], -tet_r[2][1], -tet_r[2][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[3] ) ; glVertex3dv ( tet_r[1] ) ;
+ glNormal3d ( -tet_r[3][0], -tet_r[3][1], -tet_r[3][2] ) ; glVertex3dv ( tet_r[0] ) ; glVertex3dv ( tet_r[1] ) ; glVertex3dv ( tet_r[2] ) ;
glEnd() ;
}
void FGAPIENTRY glutWireIcosahedron( void )
{
int i ;
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireIcosahedron" );
+
for ( i = 0; i < 20; i++ )
{
double normal[3] ;
{
int i ;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidIcosahedron" );
+
glBegin ( GL_TRIANGLES ) ;
for ( i = 0; i < 20; i++ )
{
void FGAPIENTRY glutWireRhombicDodecahedron( void )
{
int i ;
+
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireRhombicDodecahedron" );
+
for ( i = 0; i < 12; i++ )
{
glBegin ( GL_LINE_LOOP ) ;
{
int i ;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidRhombicDodecahedron" );
+
glBegin ( GL_QUADS ) ;
for ( i = 0; i < 12; i++ )
{
glEnd () ;
}
-#define NUM_FACES 4
-
-static GLdouble tetrahedron_v[4][3] = /* Vertices */
-{
- { -0.5, -0.288675134595, -0.144337567297 },
- { 0.5, -0.288675134595, -0.144337567297 },
- { 0.0, 0.577350269189, -0.144337567297 },
- { 0.0, 0.0, 0.672159013631 }
-} ;
-
-static GLint tetrahedron_i[4][3] = /* Vertex indices */
-{
- { 0, 1, 2 }, { 0, 2, 3 }, { 0, 3, 1 }, { 1, 3, 2 }
-} ;
-
-static GLdouble tetrahedron_n[4][3] = /* Normals */
-{
- { 0.0, 0.0, -1.0 },
- { -0.816496580928, 0.471404520791, 0.333333333333 },
- { 0.0, -0.942809041582, 0.333333333333 },
- { 0.816496580928, 0.471404520791, 0.333333333333 }
-} ;
-
void FGAPIENTRY glutWireSierpinskiSponge ( int num_levels, GLdouble offset[3], GLdouble scale )
{
int i, j ;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutWireSierpinskiSponge" );
+
if ( num_levels == 0 )
{
- for ( i = 0 ; i < NUM_FACES ; i++ )
+ for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
{
glBegin ( GL_LINE_LOOP ) ;
- glNormal3dv ( tetrahedron_n[i] ) ;
+ glNormal3d ( -tet_r[i][0], -tet_r[i][1], -tet_r[i][2] ) ;
for ( j = 0; j < 3; j++ )
{
- double x = offset[0] + scale * tetrahedron_v[tetrahedron_i[i][j]][0] ;
- double y = offset[1] + scale * tetrahedron_v[tetrahedron_i[i][j]][1] ;
- double z = offset[2] + scale * tetrahedron_v[tetrahedron_i[i][j]][2] ;
+ double x = offset[0] + scale * tet_r[tet_i[i][j]][0] ;
+ double y = offset[1] + scale * tet_r[tet_i[i][j]][1] ;
+ double z = offset[2] + scale * tet_r[tet_i[i][j]][2] ;
glVertex3d ( x, y, z ) ;
}
glEnd () ;
}
}
- else
+ else if ( num_levels > 0 )
{
GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
num_levels -- ;
scale /= 2.0 ;
- local_offset[0] = offset[0] + scale * tetrahedron_v[0][0] ;
- local_offset[1] = offset[1] + scale * tetrahedron_v[0][1] ;
- local_offset[2] = offset[2] + scale * tetrahedron_v[0][2] ;
- glutWireSierpinskiSponge ( num_levels, local_offset, scale ) ;
- local_offset[0] += scale ;
- glutWireSierpinskiSponge ( num_levels, local_offset, scale ) ;
- local_offset[0] -= 0.5 * scale ;
- local_offset[1] += 0.866025403784 * scale ;
- glutWireSierpinskiSponge ( num_levels, local_offset, scale ) ;
- local_offset[1] -= 0.577350269189 * scale ;
- local_offset[2] += 0.816496580928 * scale ;
- glutWireSierpinskiSponge ( num_levels, local_offset, scale ) ;
+ for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
+ {
+ local_offset[0] = offset[0] + scale * tet_r[i][0] ;
+ local_offset[1] = offset[1] + scale * tet_r[i][1] ;
+ local_offset[2] = offset[2] + scale * tet_r[i][2] ;
+ glutWireSierpinskiSponge ( num_levels, local_offset, scale ) ;
+ }
}
}
{
int i, j ;
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutSolidSierpinskiSponge" );
+
if ( num_levels == 0 )
{
glBegin ( GL_TRIANGLES ) ;
- for ( i = 0 ; i < NUM_FACES ; i++ )
+ for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
{
- glNormal3dv ( tetrahedron_n[i] ) ;
+ glNormal3d ( -tet_r[i][0], -tet_r[i][1], -tet_r[i][2] ) ;
for ( j = 0; j < 3; j++ )
{
- double x = offset[0] + scale * tetrahedron_v[tetrahedron_i[i][j]][0] ;
- double y = offset[1] + scale * tetrahedron_v[tetrahedron_i[i][j]][1] ;
- double z = offset[2] + scale * tetrahedron_v[tetrahedron_i[i][j]][2] ;
+ double x = offset[0] + scale * tet_r[tet_i[i][j]][0] ;
+ double y = offset[1] + scale * tet_r[tet_i[i][j]][1] ;
+ double z = offset[2] + scale * tet_r[tet_i[i][j]][2] ;
glVertex3d ( x, y, z ) ;
}
}
glEnd () ;
}
- else
+ else if ( num_levels > 0 )
{
GLdouble local_offset[3] ; /* Use a local variable to avoid buildup of roundoff errors */
num_levels -- ;
scale /= 2.0 ;
- local_offset[0] = offset[0] + scale * tetrahedron_v[0][0] ;
- local_offset[1] = offset[1] + scale * tetrahedron_v[0][1] ;
- local_offset[2] = offset[2] + scale * tetrahedron_v[0][2] ;
- glutSolidSierpinskiSponge ( num_levels, local_offset, scale ) ;
- local_offset[0] += scale ;
- glutSolidSierpinskiSponge ( num_levels, local_offset, scale ) ;
- local_offset[0] -= 0.5 * scale ;
- local_offset[1] += 0.866025403784 * scale ;
- glutSolidSierpinskiSponge ( num_levels, local_offset, scale ) ;
- local_offset[1] -= 0.577350269189 * scale ;
- local_offset[2] += 0.816496580928 * scale ;
- glutSolidSierpinskiSponge ( num_levels, local_offset, scale ) ;
+ for ( i = 0 ; i < NUM_TETR_FACES ; i++ )
+ {
+ local_offset[0] = offset[0] + scale * tet_r[i][0] ;
+ local_offset[1] = offset[1] + scale * tet_r[i][1] ;
+ local_offset[2] = offset[2] + scale * tet_r[i][2] ;
+ glutSolidSierpinskiSponge ( num_levels, local_offset, scale ) ;
+ }
}
}
-#undef NUM_FACES
-
/*** END OF FILE ***/
projects / freeglut / blobdiff