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XDrawLine(3) XLIB FUNCTIONS XDrawLine(3)
NAME
XDrawLine, XDrawLines, XDrawSegments, XSegment - draw lines, polygons, and line structure
SYNTAX
int XDrawLine(Display *display, Drawable d, GC gc, int x1, int y1, int x2, int y2);
int XDrawLines(Display *display, Drawable d, GC gc, XPoint *points, int npoints, int
mode);
int XDrawSegments(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 CoordModeOrigin or CoordModePrevi-
ous.
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 XDrawLine 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, XDrawLine does not draw a pixel more than once. If lines
intersect, the intersecting pixels are drawn multiple times.
The XDrawLines 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 XPoint structures. It
draws the lines in the order listed in the array. The lines join correctly at all inter-
mediate points, and if the first and last points coincide, the first and last lines also
join correctly. For any given line, XDrawLines 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
PolyLine protocol request were a single, filled shape. CoordModeOrigin treats all coordi-
nates as relative to the origin, and CoordModePrevious treats all coordinates after the
first as relative to the previous point.
The XDrawSegments function draws multiple, unconnected lines. For each segment, XDrawSeg-
ments draws a line between (x1, y1) and (x2, y2). It draws the lines in the order listed
in the array of XSegment structures and does not perform joining at coincident endpoints.
For any given line, XDrawSegments does not draw a pixel more than once. If lines inter-
sect, the intersecting pixels are drawn multiple 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
XDrawLines function also uses the join-style GC component. All three functions also use
these GC mode-dependent components: foreground, background, tile, stipple, tile-stipple-x-
origin, tile-stipple-y-origin, dash-offset, and dash-list.
XDrawLine, XDrawLines, and XDrawSegments can generate BadDrawable, BadGC, and BadMatch
errors. XDrawLines can also generate a BadValue error.
STRUCTURES
The XSegment 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
BadDrawable
A value for a Drawable argument does not name a defined Window or Pixmap.
BadGC A value for a GContext argument does not name a defined GContext.
BadMatch An InputOnly window is used as a Drawable.
BadMatch Some argument or pair of arguments has the correct type and range but fails to
match in some other way required by the request.
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
XDrawArc(3), XDrawPoint(3), XDrawRectangle(3)
Xlib - C Language X Interface
X Version 11 libX11 1.6.7 XDrawLine(3)
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On Apache
Under GNU General Public License
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