OpenGL C bindings library: libGL.a
void gluPartialDisk(GLUquadricObj *qobj, GLdouble InnerRadius, GLdouble OuterRadius, GLint Slices, GLint Loops, GLdouble StartAngle, GLdouble SweepAngle)
The gluPartialDisk subroutine renders a partial disk on the z=0 (zero) plane. A partial disk is similar to a full disk, except that only a subset of the disk consisting of StartAngle through StartAngle plus SweepAngle is included. For the purposes of this subroutine, 0 degrees is along the +y axis, 90 degrees is along the +x axis, 180 degrees is along the -y axis, and 270 degrees is along the -x axis.
The partial disk has a radius defined by the OuterRadius parameter and contains a concentric circular hole with a radius defined by the InnerRadius parameter. If the value of InnerRadius is 0, no hole is generated. The partial disk is subdivided around the z axis into slices and rings (as specified by the Slices and Loops parameters, respectively).
With regard to orientation, the +z side of the partial disk is considered to be outside. (See the gluQuadricOrientation subroutine for details on specifying quadrics orientation.) This means that if the orientation is set to GLU_OUTSIDE, any normals generated point along the +z axis. Otherwise, they point along the -z axis.
If texturing is turned on with the gluQuadricTexture subroutine, texture coordinates are generated linearly such that the value at (r, 0, 0) (where r=OuterRadius) is (1, 0.5).
Under the same definition, the following values also apply:
| Coordinates | Value |
|---|---|
| (0, r, 0) | (0.5, 1) |
| (-r, 0, 0) | (0, 0.5) |
| (0, -r, 0) | (0.5, 0) |
| /usr/include/GL/gl.h | Contains C language constraints, variable type definitions, and ANSI function prototypes for OpenGL. |
The gluCylinder subroutine, gluDisk subroutine, gluNewQuadric subroutine, gluQuadricOrientation subroutine, gluQuadricTexture subroutine, gluSphere subroutine.