Manual Pages for UNIX Operating System command usage for man XSegment

XLIB FUNCTIONS                                    XDrawLine(3x11)



NAME
     XDrawLine, XDrawLines, XDrawSegments, XSegment - draw lines,
     polygons, and line structure

SYNTAX
     cc [ flag... ] file... -lX11 [ library... ]

     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, XSeg-
          ment *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 Coord-
               ModeOrigin 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 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



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XLIB FUNCTIONS                                    XDrawLine(3x11)



     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 CoordModePre-
     vious 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 per-
     form 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 com-
     ponent.  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 Bad-
     Drawable, 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



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XLIB FUNCTIONS                                    XDrawLine(3x11)



               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 gen-
               erate this error.

SEE ALSO
     XDrawArc(3x11), XDrawPoint(3x11), XDrawRectangle(3x11)
     Xlib - C Language X Interface


ATTRIBUTES
     See attributes(5) for descriptions of the following attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Availability                | x11/library/libx11          |
    |_____________________________|_____________________________|
    | Interface Stability         | Committed                   |
    |_____________________________|_____________________________|
    | MT-Level                    | See XInitThreads(3X11)      |
    |_____________________________|_____________________________|






















X Version 11        Last change: libX11 1.3.5                   3