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
                 CoordModeOrigin or CoordModePrevious.

       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 speci-
       fied GC to draw a line between the specified set of points
       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 coordinates as relative
       to the origin, and CoordModePrevious treats all coordi-
       nates after the first as relative to the previous point.

       The XDrawSegments function draws multiple, unconnected
       lines.  For each segment, XDrawSegments 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 intersect, 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, stip-
       ple, 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.




X Version 11               Release 6.4                          1