XDrawArc man page on Ultrix

Man page or keyword search:  
man Server   3690 pages
apropos Keyword Search (all sections)
Output format
Ultrix logo
[printable version]

XDrawArc(3X11)			     X11R5			XDrawArc(3X11)

NAME
       XDrawArc, XDrawArcs, XArc - draw arcs and arc structure

SYNTAX
       XDrawArc(display, d, gc, x, y, width, height, angle1, angle2)
	     Display *display;
	     Drawable d;
	     GC gc;
	     int x, y;
	     unsigned int width, height;
	     int angle1, angle2;

       XDrawArcs(display, d, gc, arcs, narcs)
	     Display *display;
	     Drawable d;
	     GC gc;
	     XArc *arcs;
	     int narcs;

ARGUMENTS
       angle1	 Specifies the start of the arc relative to the three-o'clock
		 position from the center, in units of degrees * 64.

       angle2	 Specifies the path and extent of the arc relative to the
		 start of the arc, in units of degrees * 64.

       arcs	 Specifies an array of arcs.

       d	 Specifies the drawable.

       display	 Specifies the connection to the X server.

       gc	 Specifies the GC.

       narcs	 Specifies the number of arcs in the array.

       width
       height	 Specify the width and height, which are the major and minor
		 axes of the arc.

       x
       y	 Specify the x and y coordinates, which are relative to the
		 origin of the drawable and specify the upper-left corner of
		 the bounding rectangle.

DESCRIPTION
       draws a single circular or elliptical arc, and draws multiple circular
       or elliptical arcs.  Each arc is specified by a rectangle and two
       angles.	The center of the circle or ellipse is the center of the rec‐
       tangle, and the major and minor axes are specified by the width and
       height.	Positive angles indicate counterclockwise motion, and negative
       angles indicate clockwise motion.  If the magnitude of angle2 is
       greater than 360 degrees, or truncates it to 360 degrees.

       For an arc specified as [ x, y, width, height, angle1, angle2 ], the
       origin of the major and minor axes is at [ x+(width/2), y+(height/2) ],
       and the infinitely thin path describing the entire circle or ellipse
       intersects the horizontal axis at [ x, y+(height/2) ] and [ x+width,
       y+(height/2) ] and intersects the vertical axis at [ x+(width/2), y ]
       and [ x+(width/2), y+height ].  These coordinates can be fractional and
       so are not truncated to discrete coordinates.  The path should be
       defined by the ideal mathematical path.	For a wide line with line-
       width lw, the bounding outlines for filling are given by the two infin‐
       itely thin paths consisting of all points whose perpendicular distance
       from the path of the circle/ellipse is equal to lw/2 (which may be a
       fractional value).  The cap-style and join-style are applied the same
       as for a line corresponding to the tangent of the circle/ellipse at the
       endpoint.

       For an arc specified as [ x, y, width, height, angle1, angle2 ], the
       angles must be specified in the effectively skewed coordinate system of
       the ellipse (for a circle, the angles and coordinate systems are iden‐
       tical).	The relationship between these angles and angles expressed in
       the normal coordinate system of the screen (as measured with a protrac‐
       tor) is as follows:

       skewed-angle = atan [ tan(normal-angle) * (width/height) ] + adjust

       The skewed-angle and normal-angle are expressed in radians (rather than
       in degrees scaled by 64) in the range [ 0, 2pi ] and where atan returns
       a value in the range [ -pi/2, pi/2 ] and adjust is:

       0       for normal-angle in the range  [ 0, pi/2 ]

       pi      for normal-angle in the range  [ pi/2, 3pi/2 ]

       2pi     for normal-angle in the range  [ 3pi/2, 2pi ]

       For any given arc, and do not draw a pixel more than once.  If two arcs
       join correctly and if the line-width is greater than zero and the arcs
       intersect, and do not draw a pixel more than once.  Otherwise, the
       intersecting pixels of intersecting arcs are drawn multiple times.
       Specifying an arc with one endpoint and a clockwise extent draws the
       same pixels as specifying the other endpoint and an equivalent counter‐
       clockwise extent, except as it affects joins.

       If the last point in one arc coincides with the first point in the fol‐
       lowing arc, the two arcs will join correctly.  If the first point in
       the first arc coincides with the last point in the last arc, the two
       arcs will join correctly.  By specifying one axis to be zero, a hori‐
       zontal or vertical line can be drawn.  Angles are computed based solely
       on the coordinate system and ignore the aspect ratio.

       Both functions use these GC components: function, plane-mask, line-
       width, line-style, cap-style, join-style, fill-style, subwindow-mode,
       clip-x-origin, clip-y-origin, and clip-mask.  They also use these GC
       mode-dependent components: foreground, background, tile, stipple, tile-
       stipple-x-origin, tile-stipple-y-origin, dash-offset, and dash-list.

       and can generate and errors.

STRUCTURES
       The structure contains:

       typedef struct {
	       short x, y;
	       unsigned short width, height;
	       short angle1, angle2;		 /* Degrees * 64 */
       } XArc;

       All x and y members are signed integers.	 The width and height members
       are 16-bit unsigned integers.  You should be careful not to generate
       coordinates and sizes out of the 16-bit ranges, because the protocol
       only has 16-bit fields for these values.

DIAGNOSTICS
       A value for a Drawable argument does not name a defined Window or
       Pixmap.

       A value for a GContext argument does not name a defined GContext.

       An	 window is used as a Drawable.

       Some argument or pair of arguments has the correct type and range but
       fails
		 to match in some other way required by the request.

SEE ALSO
       XDrawLine(3X11), XDrawPoint(3X11), XDrawRectangle(3X11)
       Xlib - C Language X Interface

								XDrawArc(3X11)
[top]

List of man pages available for Ultrix

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net