# glupartialdisk(3g) [xfree86 man page]

GLUPARTIALDISK(3G) GLUPARTIALDISK(3G)NAME

gluPartialDisk - draw an arc of a diskC 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 theaxis, and 270 degrees along the-yaxis). 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 gen- erated. The partial disk is subdivided around the z axis into slices (like pizza slices), and also about the z axis into rings (as speci- fied 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-xaxis. 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,-z, 0) it is (0.5, 0.0).-rSEE ALSO

gluCylinder(3G), gluDisk(3G), gluNewQuadric(3G), gluQuadricOrientation(3G), gluQuadricTexture(3G), gluSphere(3G) GLUPARTIALDISK(3G)

## Check Out this Related Man Page

CAIRO_ARC(3) 1 CAIRO_ARC(3)CairoContext::arc - Adds a circular arc Object oriented style (method):SYNOPSIS

public void CairoContext::arc (float $x, float $y, float $radius, float $angle1, float $angle2)DESCRIPTION

Procedural style: void cairo_arc (CairoContext $context, float $x, float $y, float $radius, float $angle1, float $angle2) Adds a circular arc of the given radius to the current path. The arc is centered at ($x, $y), begins at $angle1 and proceeds in the direc- tion of increasing angles to end at $angle2. If $angle2 is less than $angle1 it will be progressively increased by 2*M_PI until it is greater than $angle1. If there is a current point, an initial line segment will be added to the path to connect the current point to the beginning of the arc. If this initial line is undesired, it can be avoided by calling CairoContext::newSubPath or procedural cairo_new_sub_path(3) before calling CairoContext::arc or cairo_arc(3). Angles are measured in radians. An angle of 0.0 is in the direction of the positive X axis (in user space). An angle of M_PI/2.0 radians (90 degrees) is in the direction of the positive Y axis (in user space). Angles increase in the direction from the positive X axis toward the positive Y axis. So with the default transformation matrix, angles increase in a clockwise direction. (To convert from degrees to radians, use degrees * (M_PI / 180.).) This function gives the arc in the direction of increasing angles; see CairoContext::arcNegative or cairo_arc_negative(3) to get the arc in the direction of decreasing angles.PARAMETERS

o $context - A valid CairoContext object o $x - x position o $y - y position o $radius - Radius of the arc o $angle1 - start angle o $angle2 - end angleRETURN VALUES

No value is returned.EXAMPLES

Example #1 Object oriented style <?php $s = new CairoImageSurface(CairoFormat::ARGB32, 100, 100); $c = new CairoContext($s); $c->setSourceRgb(0, 0, 0); $c->paint(); $c->setLineWidth(1); $c->setSourceRgb(1, 1, 1); for ($r = 50; $r > 0; $r10) { $c->arc(50, 50, $r, 0, 2 * M_PI); $c->stroke(); $c->fill(); } $s->writeToPng(dirname(__FILE__) . '/CairoContext__arc.png'); ?> Example #2 Procedural style <?php $s = cairo_image_surface_create(CAIRO_SURFACE_TYPE_IMAGE, 100, 100); $c = cairo_create($s); cairo_set_source_rgb($c, 0, 0, 0); cairo_paint($c); cairo_set_source_rgb($c, 1, 1, 1); cairo_set_line_width($c, 1); for ($r = 50; $r > 0; $r-=10) { cairo_arc($c, 50, 50, $r, 0, 2 * M_PI); cairo_stroke($c); cairo_fill($c); } cairo_surface_write_to_png($s, dirname(__FILE__) . '/cairo_arc.png'); ?>-=SEE ALSO

CairoContext::arcNegative.PHP Documentation GroupCAIRO_ARC(3)