Linux Manual Pages

Free Software * Books

Source Code

Free Media

Linux

GLUPARTIALDISK

NAME
C SPECIFICATION
PARAMETERS
DESCRIPTION
SEE ALSO

NAME

gluPartialDisk − draw an arc of a disk

C SPECIFICATION

void gluPartialDisk( GLUquadric* quad,

	GLdouble inner,
	GLdouble outer,
	GLint slices,
	GLint loops,
	GLdouble start,
	GLdouble sweep )

PARAMETERS

	quad		Specifies a quadrics object (created with gluNewQuadric).
	inner		Specifies the inner radius of the partial disk (can be 0).
	outer		Specifies the outer radius of the partial disk.
	slices		Specifies the number of subdivisions around the z axis.
	loops		Specifies the number of concentric rings about the origin into which the partial disk is subdivided.
	start		Specifies the starting angle, in degrees, of the disk portion.
	sweep		Specifies the sweep angle, in degrees, of the disk portion.

DESCRIPTION

gluPartialDisk 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 start through start + sweep is included (where 0 degrees is along the +yaxis, 90 degrees along the +x axis, 180 degrees along the −y axis, and 270 degrees along the −x axis).

The partial disk has a radius of outer, and contains a concentric circular hole with a radius of inner. If inner is 0, 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 +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 +z axis. Otherwise, they point along the −z axis.

If texturing is turned on (with gluQuadricTexture), texture coordinates are generated linearly such that where $ r ~=~ "outer" $, the value at (r, 0, 0) is (1.0, 0.5), at (0, r, 0) it is (0.5, 1.0), at (−r, 0, 0) it is (0.0, 0.5), and at (0, −r, 0) it is (0.5, 0.0).

Opportunity

Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.

Free Software

Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.

Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.

Free Books

The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.

Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.

Education

Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.

Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.