XSetLineAttribute.3X11(3X11) — sys5 — Apollo Domain/OS SR10.4

XSetLineAttribute(3X11)              SysV              XSetLineAttribute(3X11)



NAME
     XSetLineAttribute, XSetDashes - GC convience routines

SYNTAX
     XSetLineAttributes(display, gc, line_width, line_style, cap_style,
     join_style)
           Display *display;
           GC gc;
           unsigned int line_width;
           int line_style;
           int cap_style;
           int join_style;

     XSetDashes(display, gc, dash_offset, dash_list, n)
             Display *display;
             GC gc;
             int dash_offset;
             char dash_list[];
             int n;

ARGUMENTS
     cap_style Specifies the line-style and cap-style you want to set for the
               specified GC.  You can pass CapNotLast, CapButt, CapRound, or
               CapProjecting.

     dash_list Specifies the dash-list for the dashed line-style you want to
               set for the specified GC.

     dash_offset
               Specifies the phase of the pattern for the dashed line-style
               you want to set for the specified GC.

     display   Specifies the connection to the X server.

     gc        Specifies the GC.

     join_style
               Specifies the line join-style you want to set for the specified
               GC.  You can pass JoinMiter, JoinRound, or JoinBevel.

     line_style
               Specifies the line-style you want to set for the specified GC.
               You can pass LineSolid, LineOnOffDash, or LineDoubleDash.

     line_width
               Specifies the line-width you want to set for the specified GC.

     n         Specifies the number of elements in dash_list.

DESCRIPTION
     The XSetLineAttributes function sets the line drawing components in the
     specified GC.

     XSetLineAttributes can generate BadAlloc, BadGC, and BadValue errors.

     The XSetDashes function sets the dash-offset and dash-list attributes for
     dashed line styles in the specified GC.  There must be at least one
     element in the specified dash_list, or a BadValue error results. The
     initial and alternating elements (second, fourth, and so on) of the
     dash_list are the even dashes, and the others are the odd dashes.  Each
     element specifies a dash length in pixels.  All of the elements must be

     nonzero, or a BadValue error results.  Specifying an odd-length list is
     equivalent to specifying the same list concatenated with itself to
     produce an even-length list.

     The dash-offset defines the phase of the pattern, specifying how many
     pixels into the dash-list the pattern should actually begin in any single
     graphics request.  Dashing is continuous through path elements combined
     with a join-style but is reset to the dash-offset each time a cap-style
     is applied at a line endpoint.

     The unit of measure for dashes is the same for the ordinary coordinate
     system.  Ideally, a dash length is measured along the slope of the line,
     but implementations are only required to match this ideal for horizontal
     and vertical lines.  Failing the ideal semantics, it is suggested that
     the length be measured along the major axis of the line.  The major axis
     is defined as the x axis for lines drawn at an angle of between -45 and
     +45 degrees or between 315 and 225 degrees from the x axis.  For all
     other lines, the major axis is the y axis.

     XSetDashes can generate BadAlloc, BadGC, and BadValue errors.

DIAGNOSTICS
     BadAlloc  The server failed to allocate the requested resource or server
               memory.

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

     BadValue  Some numeric value falls outside the range of values accepted
               by the request.  Unless a specific range is specified for an
               argument, the full range defined by the argument's type is
               accepted.  Any argument defined as a set of alternatives can
               generate this error.

SEE ALSO
     XCreateGC(3X11), XQueryBestSize(3X11), XSetArcMode(3X11),
     XSetClipOrigin(3X11), XSetFillStyle(3X11), XSetFont(3X11),
     XSetState(3X11), XSetTile(3X11)
     Xlib - C Language X Interface

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