gluPartialDisk function
The gluPartialDisk function draws an arc of a disk.
Syntax
void WINAPI gluPartialDisk(
GLUquadric *qobj,
GLdouble innerRadius,
GLdouble outerRadius,
GLint slices,
GLint loops,
GLdouble startAngle,
GLdouble sweepAngle
);
Parameters
-
qobj
-
A quadric object (created with gluNewQuadric).
-
innerRadius
-
The inner radius of the partial disk (can be zero).
-
outerRadius
-
The outer radius of the partial disk.
-
slices
-
The number of subdivisions around the z-axis.
-
loops
-
The number of concentric rings about the origin into which the partial disk is subdivided.
-
startAngle
-
The starting angle, in degrees, of the disk portion.
-
sweepAngle
-
The sweep angle, in degrees, of the disk portion.
Return value
This function does not return a value.
Remarks
The gluPartialDisk function renders a partial disk on the z = 0 plane. A partial disk is similar to a full disk, except that only the subset of the disk from startAngle through startAngle + sweepAngle is included (where 0 degrees is along the positive y-axis, 90 degrees is along the positive x-axis, 180 degrees is along the negative y-axis, and 270 degrees is along the negative x-axis).
The partial disk has a radius of outerRadius and contains a concentric circular hole with a radius of innerRadius. If innerRadius is zero, then no hole is generated. The partial disk is subdivided around the z-axis into slices (like pizza slices), and also about the z-axis into rings (as specified by slices and loops, respectively).
With respect to orientation, the positive z-side of the partial disk is considered to be outside (see gluQuadricOrientation). This means that if the orientation is set to GLU_OUTSIDE, then any normals generated point along the positive z-axis.
If you have turned on texturing (with gluQuadricTexture), gluPartialDisk generates texture coordinates linearly such that where r = outerRadius, the value at (r, 0, 0) is (1, 0.5); at (0, r, 0) it is (0.5, 1); at (r, 0, 0) it is (0, 0.5); and at (0, r, 0) it is (0.5, 0).
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client |
Windows 2000 Professional [desktop apps only] |
| Minimum supported server |
Windows 2000 Server [desktop apps only] |
| Header |
|
| Library |
|
| DLL |
|