XDrawLine(3X11)         COMMAND REFERENCE         XDrawLine(3X11)



NAME
     XDrawLine, XDrawLines, XDrawSegments - draw lines and
     polygons

SYNOPSIS
     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



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XDrawLine(3X11)         COMMAND REFERENCE         XDrawLine(3X11)



     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.




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XDrawLine(3X11)         COMMAND REFERENCE         XDrawLine(3X11)



     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







































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