XSetLineAttribute(3X) XSetLineAttribute(3X)
NAME
XSetLineAttribute, XSetDashes - GC convience 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.
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XSetLineAttribute(3X) XSetLineAttribute(3X)
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.
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XSetLineAttribute(3X) XSetLineAttribute(3X)
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 Programming Manual
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