XDrawLine(3X11) X11R5 XDrawLine(3X11)NAME
XDrawLine, XDrawLines, XDrawSegments, XSegment - draw lines, polygons,
and line structure
SYNTAX
XDrawLine(display, d, gc, x1, y1, x2, y2)
Display *display;
Drawable d;
GC gc;
int x1, y1, x2, y2;
XDrawLines(display, d, gc, points, npoints, mode)
Display *display;
Drawable d;
GC gc;
XPoint *points;
int npoints;
int mode;
XDrawSegments(display, d, gc, segments, nsegments)
Display *display;
Drawable d;
GC gc;
XSegment *segments;
int nsegments;
ARGUMENTS
d Specifies the drawable.
display Specifies the connection to the X server.
gc Specifies the GC.
mode Specifies the coordinate mode. You can pass or
npoints Specifies the number of points in the array.
nsegments Specifies the number of segments in the array.
points Specifies an array of points.
segments Specifies an array of segments.
x1
y1
x2
y2 Specify the points (x1, y1) and (x2, y2) to be connected.
DESCRIPTION
The function uses the components of the specified GC to draw a line
between the specified set of points (x1, y1) and (x2, y2). It does not
perform joining at coincident endpoints. For any given line, does not
draw a pixel more than once. If lines intersect, the intersecting pix‐
els are drawn multiple times.
The function uses the components of the specified GC to draw npoints-1
lines between each pair of points (point[i], point[i+1]) in the array
of structures. It draws the lines in the order listed in the array.
The lines join correctly at all intermediate points, and if the first
and last points coincide, the first and last lines also join correctly.
For any given line, does not draw a pixel more than once. If thin
(zero line-width) lines intersect, the intersecting pixels are drawn
multiple times. If wide lines intersect, the intersecting pixels are
drawn only once, as though the entire protocol request were a single,
filled shape. treats all coordinates as relative to the origin, and
treats all coordinates after the first as relative to the previous
point.
The function draws multiple, unconnected lines. For each segment,
draws a line between (x1, y1) and (x2, y2). It draws the lines in the
order listed in the array of structures and does not perform joining at
coincident endpoints. For any given line, does not draw a pixel more
than once. If lines intersect, the intersecting pixels are drawn mul‐
tiple times.
All three functions use these GC components: function, plane-mask,
line-width, line-style, cap-style, fill-style, subwindow-mode, clip-x-
origin, clip-y-origin, and clip-mask. The function also uses the join-
style GC component. All three functions also use these GC mode-depen‐
dent components: foreground, background, tile, stipple, tile-stipple-x-
origin, tile-stipple-y-origin, dash-offset, and dash-list.
and can generate and errors. can also generate a error.
STRUCTURES
The structure contains:
typedef struct {
short x1, y1, x2, y2;
} XSegment;
All x and y members are signed integers. The width and height members
are 16-bit unsigned integers. You should be careful not to generate
coordinates and sizes out of the 16-bit ranges, because the protocol
only has 16-bit fields for these values.
DIAGNOSTICS
A value for a Drawable argument does not name a defined Window or
Pixmap.
A value for a GContext argument does not name a defined GContext.
An window is used as a Drawable.
Some argument or pair of arguments has the correct type and range but
fails
to match in some other way required by the request.
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 ALSOXDrawArc(3X11), XDrawPoint(3X11), XDrawRectangle(3X11)
Xlib - C Language X Interface
XDrawLine(3X11)