Open GL Super Bible:Quadrics: Spheres, Cylinders, and Disks















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Open GL Super Bible


(Publisher: Macmillan Computer Publishing)

Author(s): Waite group Press

ISBN: 1571690735

Publication Date: 08/01/96

 




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Reference Section
gluCylinder

Purpose
Draws a quadric cylinder.
Include File
<GL/glu.h>
Syntax
void gluCylinder(GLUquadricObj *obj, GLdouble baseRadius, GLdouble topRadius, GLdouble height, GLint slices, GLint stacks);
Description
This function draws a hollow cylinder with no
ends along the z-axis. If topRadius or bottomRadius is 0, a cone is
drawn instead. The cylinder is projected height units along the positive
z-axis. The slices argument controls the number of sides along the
cylinder. The stacks argument controls the number of segments along the
z-axis (across the cylinder) that are generated.


Parameters

obj

GLUquadricObj *: The quadric state information to use for rendering.
baseRadius

GLdouble: The radius of the base (Z=0) of the cylinder.
topRadius
GLdouble: The radius of the top (Z=height) of the cylinder.
height

GLdouble: The height or length of the cylinder along the z-axis.
slices

GLint: The number of sides on the cylinder.
stacks

GLint: The number of segments in the cylinder along the z-axis.
Returns
None.
Example
See the example in CH13\PENCIL.C.
See Also
gluDeleteQuadric, gluNewQuadric,
gluQuadricCallback, gluQuadricDrawStyle, gluQuadricNormals,
gluQuadricOrientation, gluQuadricTexture


gluDeleteQuadric

Purpose
Deletes a quadric state object.
Include File
<GL/glu.h>
Syntax
void gluDeleteQuadric(GLUquadricObj *obj);
Description
This function deletes a quadric state object.
Once an object has been deleted it cannot be used for drawing again.


Parameters

obj

GLUquadricObj *: The quadric state object to delete.
Returns
None.
See Also
gluNewQuadric, gluQuadricCallback,
gluQuadricDrawStyle, gluQuadricNormals, gluQuadricOrientation,
gluQuadricTexture


gluDisk

Purpose
Draws a quadric disk.
Include File
<GL/glu.h>
Syntax
void gluDisk(GLUquadricObj *obj, GLdouble innerRadius, GLdouble outerRadius, GLint slices, GLint loops);
Description
This function draws a disk perpendicular to the
z-axis. If innerRadius is 0, a solid (filled) circle is drawn instead of
a washer. The slices argument controls the number of sides on the disk.
The loops argument controls the number of rings generated out from the
z-axis.


Parameters

obj

GLUquadricObj *: The quadric state information to use for rendering.
innerRadius

GLdouble: The inside radius of the disk.
outerRadius
GLdouble: The outside radius of the disk.
slices

GLint: The number of sides on the cylinder.
loops

GLint: The number of rings out from the z-axis.
Returns
None.
See Also
gluDeleteQuadric, gluNewQuadric,
gluQuadricCallback, gluQuadricDrawStyle, gluQuadricNormals,
gluQuadricOrientation, gluQuadricTexture


gluNewQuadric

Purpose
Creates a new quadric state object.
Include File
<GL/glu.h>
Syntax
GLUquadricObj *gluNewQuadric(void);
Description
This function creates a new opaque quadric state object to be used for drawing. The quadric state object contains specifications that determine how subsequent images will be drawn.
Parameters
None.
Returns
GLUquadricObj *: NULL if no memory is available; otherwise, a valid quadric state object pointer.
Example
See the example in CH13\PENCIL.C.
See Also
gluDeleteQuadric, gluQuadricCallback,
gluQuadricDrawStyle, gluQuadricNormals, gluQuadricOrientation,
gluQuadricTexture


gluPartialDisk

Purpose
Draws a partial quadric disk.
Include File
<GL/glu.h>
Syntax
void gluPartialDisk(GLUquadricObj *obj, GLdouble innerRadius, GLdouble outerRadius, GLint slices, GLint loops, GLdouble startAngle, GLdouble sweepAngle);
Description
This function draws a partial disk
perpendicular to the z-axis. If innerRadius is 0, a solid (filled)
circle is drawn instead of a washer. The slices argument controls the
number of sides on the disk. The loops argument controls the number of
rings out from the z-axis that are generated. The startAngle argument
specifies the starting angle of the disk with 0? at the top of the disk
and 90? at the right of the disk. The sweepAngle argument specifies the
portion of the disk in degrees.


Parameters

obj

GLUquadricObj *: The quadric state information to use for rendering.
innerRadius

GLdouble: The inside radius of the disk.
outerRadius

GLdouble: The outside radius of the disk.
slices

GLint: The number of sides on the cylinder.
loops

GLint: The number of rings out from the z-axis.
startAngle

GLdouble: The start angle of the partial disk.
sweepAngle

GLdouble: The angular size of the partial disk.
Returns
None.
See Also
gluDeleteQuadric, gluNewQuadric,
gluQuadricCallback, gluQuadricDrawStyle, gluQuadricNormals,
gluQuadricOrientation, gluQuadricTexture






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