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XSetLineAttributes(3X11)


X11R6


NAME

  XSetLineAttributes, XSetDashes - GC convenience routines


SYNOPSIS

  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 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 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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