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authormarha <marha@users.sourceforge.net>2009-06-28 22:07:26 +0000
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+'\" e
+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1994, 1996 X Consortium
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining
+.\" a copy of this software and associated documentation files (the
+.\" "Software"), to deal in the Software without restriction, including
+.\" without limitation the rights to use, copy, modify, merge, publish,
+.\" distribute, sublicense, and/or sell copies of the Software, and to
+.\" permit persons to whom the Software is furnished to do so, subject to
+.\" the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be included
+.\" in all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+.\" OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+.\" IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
+.\" OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+.\" ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+.\" OTHER DEALINGS IN THE SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of the X Consortium shall
+.\" not be used in advertising or otherwise to promote the sale, use or
+.\" other dealings in this Software without prior written authorization
+.\" from the X Consortium.
+.\"
+.\" Copyright \(co 1985, 1986, 1987, 1988, 1989, 1990, 1991 by
+.\" Digital Equipment Corporation
+.\"
+.\" Portions Copyright \(co 1990, 1991 by
+.\" Tektronix, Inc.
+.\"
+.\" Permission to use, copy, modify and distribute this documentation for
+.\" any purpose and without fee is hereby granted, provided that the above
+.\" copyright notice appears in all copies and that both that copyright notice
+.\" and this permission notice appear in all copies, and that the names of
+.\" Digital and Tektronix not be used in in advertising or publicity pertaining
+.\" to this documentation without specific, written prior permission.
+.\" Digital and Tektronix makes no representations about the suitability
+.\" of this documentation for any purpose.
+.\" It is provided ``as is'' without express or implied warranty.
+.\"
+.\" $XFree86: xc/doc/man/X11/XDrArc.man,v 1.4 2003/04/28 22:17:54 herrb Exp $
+.\" $XdotOrg: lib/X11/man/XDrawArc.man,v 1.3 2005-08-17 01:27:08 alanc Exp $
+.\"
+.ds xT X Toolkit Intrinsics \- C Language Interface
+.ds xW Athena X Widgets \- C Language X Toolkit Interface
+.ds xL Xlib \- C Language X Interface
+.ds xC Inter-Client Communication Conventions Manual
+.na
+.de Ds
+.nf
+.\\$1D \\$2 \\$1
+.ft 1
+.\".ps \\n(PS
+.\".if \\n(VS>=40 .vs \\n(VSu
+.\".if \\n(VS<=39 .vs \\n(VSp
+..
+.de De
+.ce 0
+.if \\n(BD .DF
+.nr BD 0
+.in \\n(OIu
+.if \\n(TM .ls 2
+.sp \\n(DDu
+.fi
+..
+.de FD
+.LP
+.KS
+.TA .5i 3i
+.ta .5i 3i
+.nf
+..
+.de FN
+.fi
+.KE
+.LP
+..
+.de IN \" send an index entry to the stderr
+..
+.de C{
+.KS
+.nf
+.D
+.\"
+.\" choose appropriate monospace font
+.\" the imagen conditional, 480,
+.\" may be changed to L if LB is too
+.\" heavy for your eyes...
+.\"
+.ie "\\*(.T"480" .ft L
+.el .ie "\\*(.T"300" .ft L
+.el .ie "\\*(.T"202" .ft PO
+.el .ie "\\*(.T"aps" .ft CW
+.el .ft R
+.ps \\n(PS
+.ie \\n(VS>40 .vs \\n(VSu
+.el .vs \\n(VSp
+..
+.de C}
+.DE
+.R
+..
+.de Pn
+.ie t \\$1\fB\^\\$2\^\fR\\$3
+.el \\$1\fI\^\\$2\^\fP\\$3
+..
+.de ZN
+.ie t \fB\^\\$1\^\fR\\$2
+.el \fI\^\\$1\^\fP\\$2
+..
+.de hN
+.ie t <\fB\\$1\fR>\\$2
+.el <\fI\\$1\fP>\\$2
+..
+.de NT
+.ne 7
+.ds NO Note
+.if \\n(.$>$1 .if !'\\$2'C' .ds NO \\$2
+.if \\n(.$ .if !'\\$1'C' .ds NO \\$1
+.ie n .sp
+.el .sp 10p
+.TB
+.ce
+\\*(NO
+.ie n .sp
+.el .sp 5p
+.if '\\$1'C' .ce 99
+.if '\\$2'C' .ce 99
+.in +5n
+.ll -5n
+.R
+..
+. \" Note End -- doug kraft 3/85
+.de NE
+.ce 0
+.in -5n
+.ll +5n
+.ie n .sp
+.el .sp 10p
+..
+.ny0
+.de EX
+.sp
+.nf
+.ft CW
+..
+.de EE
+.ft R
+.fi
+.sp
+..
+'\" e
+.TH XDrawArc __libmansuffix__ __xorgversion__ "XLIB FUNCTIONS"
+.SH NAME
+XDrawArc, XDrawArcs, XArc \- draw arcs and arc structure
+.SH SYNTAX
+.HP
+int XDrawArc\^(\^Display *\fIdisplay\fP\^, Drawable \fId\fP\^, GC \fIgc\fP\^,
+int \fIx\fP\^, int \fIy\fP\^, unsigned int \fIwidth\fP\^, unsigned int
+\fIheight\fP\^, int \fIangle1\fP\^, int \fIangle2\fP\^);
+.HP
+int XDrawArcs\^(\^Display *\fIdisplay\fP\^, Drawable \fId\fP\^, GC \fIgc\fP\^,
+XArc *\fIarcs\fP\^, int \fInarcs\fP\^);
+.SH ARGUMENTS
+.IP \fIangle1\fP 1i
+Specifies the start of the arc relative to the three-o'clock position
+from the center, in units of degrees * 64.
+.IP \fIangle2\fP 1i
+Specifies the path and extent of the arc relative to the start of the
+arc, in units of degrees * 64.
+.IP \fIarcs\fP 1i
+Specifies an array of arcs.
+.IP \fId\fP 1i
+Specifies the drawable.
+.IP \fIdisplay\fP 1i
+Specifies the connection to the X server.
+.IP \fIgc\fP 1i
+Specifies the GC.
+.IP \fInarcs\fP 1i
+Specifies the number of arcs in the array.
+.ds Wh , which are the major and minor axes of the arc
+.IP \fIwidth\fP 1i
+.br
+.ns
+.IP \fIheight\fP 1i
+Specify the width and height\*(Wh.
+.ds Xy , which are relative to the origin of the drawable \
+and specify the upper-left corner of the bounding rectangle
+.IP \fIx\fP 1i
+.br
+.ns
+.IP \fIy\fP 1i
+Specify the x and y coordinates\*(Xy.
+.SH DESCRIPTION
+.EQ
+delim %%
+.EN
+.ZN XDrawArc
+draws a single circular or elliptical arc, and
+.ZN XDrawArcs
+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
+rectangle, 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,
+.ZN XDrawArc
+or
+.ZN XDrawArcs
+truncates it to 360 degrees.
+.LP
+For an arc specified as %[ ~x, ~y, ~width , ~height, ~angle1, ~angle2 ]%,
+the origin of the major and minor axes is at
+% [ x +^ {width over 2} , ~y +^ {height over 2} ]%,
+and the infinitely thin path describing the entire circle or ellipse
+intersects the horizontal axis at % [ x, ~y +^ {height over 2} ]% and
+% [ x +^ width , ~y +^ { height over 2 }] %
+and intersects the vertical axis at % [ x +^ { width over 2 } , ~y ]% and
+% [ x +^ { width over 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 infinitely 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.
+.LP
+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 identical). The
+relationship between these angles and angles expressed in the normal
+coordinate system of the screen (as measured with a protractor) is as
+follows:
+.LP
+.Ds
+% roman "skewed-angle" ~ = ~ atan left ( tan ( roman "normal-angle" )
+ * width over height right ) +^ adjust%
+.De
+.LP
+The skewed-angle and normal-angle are expressed in radians (rather
+than in degrees scaled by 64) in the range % [ 0 , ~2 pi ]% and where atan
+returns a value in the range % [ - pi over 2 , ~pi over 2 ] %
+and adjust is:
+.LP
+.TS
+l l.
+%0% for normal-angle in the range % [ 0 , ~pi over 2 ]%
+%pi% for normal-angle in the range % [ pi over 2 , ~{3 pi} over 2 ]%
+%2 pi% for normal-angle in the range % [ {3 pi} over 2 , ~2 pi ]%
+.TE
+.LP
+For any given arc,
+.ZN XDrawArc
+and
+.ZN XDrawArcs
+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,
+.ZN XDrawArc
+and
+.ZN XDrawArcs
+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 counterclockwise extent,
+except as it affects joins.
+.LP
+If the last point in one arc coincides with the first point in the following
+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 horizontal or vertical line can be
+drawn.
+Angles are computed based solely on the coordinate system and ignore the
+aspect ratio.
+.LP
+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.
+.LP
+.ZN XDrawArc
+and
+.ZN XDrawArcs
+can generate
+.ZN BadDrawable ,
+.ZN BadGC ,
+and
+.ZN BadMatch
+errors.
+.SH STRUCTURES
+The
+.ZN XArc
+structure contains:
+.LP
+.EX
+typedef struct {
+ short x, y;
+ unsigned short width, height;
+ short angle1, angle2; /\&* Degrees * 64 */
+} XArc;
+.EE
+.LP
+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.
+.SH DIAGNOSTICS
+.TP 1i
+.ZN BadDrawable
+A value for a Drawable argument does not name a defined Window or Pixmap.
+.TP 1i
+.ZN BadGC
+A value for a GContext argument does not name a defined GContext.
+.TP 1i
+.ZN BadMatch
+An
+.ZN InputOnly
+window is used as a Drawable.
+.TP 1i
+.ZN BadMatch
+Some argument or pair of arguments has the correct type and range but fails
+to match in some other way required by the request.
+.SH "SEE ALSO"
+XDrawLine(3X11),
+XDrawPoint(3X11),
+XDrawRectangle(3X11)
+.br
+\fI\*(xL\fP