XDrawLine(3X11)                      BSD                       XDrawLine(3X11)



NAME
     XDrawLine, XDrawLines, XDrawSegments - draw lines and polygons

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 a pointer to an array of points.

     segments  Specifies a pointer to 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 intermediate 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
     coordinates 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, 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, 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.

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(3X11), XDrawPoint(3X11), XDrawRectangle(3X11)
     Xlib - C Language X Interface