XSetLineAttributes(3X11) XLIB FUNCTIONS XSetLineAttributes(3X11)NAME
XSetLineAttributes, XSetDashes - 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
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 speci-
fied 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.
X Version 11 Release 6.4 1
XSetLineAttributes(3X11) XLIB FUNCTIONS XSetLineAttributes(3X11)DESCRIPTION
The XSetLineAttributes function sets the line drawing com-
ponents in the specified GC.
XSetLineAttributes can generate BadAlloc, BadGC, and Bad-
Value 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 pro-
duce an even-length list.
The dash-offset defines the phase of the pattern, specify-
ing 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 ordi-
nary coordinate system. Ideally, a dash length is mea-
sured along the slope of the line, but implementations are
only required to match this ideal for horizontal and ver-
tical 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 spe-
cific 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.
X Version 11 Release 6.4 2
XSetLineAttributes(3X11) XLIB FUNCTIONS XSetLineAttributes(3X11)SEE ALSOXCreateGC(3X11), XQueryBestSize(3X11), XSetArcMode(3X11),
XSetClipOrigin(3X11), XSetFillStyle(3X11), XSetFont(3X11),
XSetState(3X11), XSetTile(3X11)
Xlib - C Language X Interface
X Version 11 Release 6.4 3
