XSetLineAttributes(XS)   X Version 11 (Release 5)     XSetLineAttributes(XS)
                                6 January 1993


 Name

    XSetLineAttributes - GC convenience 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


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

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

    dashoffset  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.

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

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

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

    n            Specifies the number of elements in dashlist.

 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 ele-
    ment in the specified dashlist, or a ``BadValue'' error results.  The
    initial and alternating elements (second, fourth, and so on) of the
    dashlist 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 between each sequence
    of joined lines.

    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 135 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 speci-
                 fied 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(XS), XQueryBestSize(XS), XSetArcMode(XS), XSetClipOrigin(XS),
    XSetFillStyle(XS), XSetFont(XS), XSetState(XS), XSetTile(XS)
    Xlib - C Language X Interface