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       flydraw - an inline drawing tool




       flydraw is an inline drawing tool, which uses libgd to output PNG, JPG,
       GIF files.  It parse its standard input  for  drawing  commands.   Each
       command takes one line.

       In  the  following  lines,  [color]  may  be  either a color name, or 3
       integers between 0 and 255, separated by  commas,  for  the  values  of

       animate fra,del,rep
              This  command  is  only available for WIMS OEF and doc, and MUST
              appear on the first line. Set up animation for fra frames,  with
              del  seconds  between  frames,  and rep repetitions (rep=0 means
              infinite repetition).

       animstep n
              Set up an integer which can be called in  any  evaluation.  Used
              for  animation. Direct use of this command must be avoided under

       arc x,y,w,h,a1,a2,[color]
              Arc segment of an ellipse of width w and  hight  h  centered  at
              (x,y), from angle a1 to angle a2.

       arrow x1,y1,x2,y2,l,[color]
              Arrow  (x1,y1)--->(x2,y2),  where l is the length (in pixels) of

       circle x,y,d,[color]
              Circle of center (x,y) and diameter d (in pixels).

              Does nothing.

       copy x,y,x1,y1,x2,y2,[filename]
              (Synonym: insert) Insert the region from (x1,y1) to (x2,y2)  (in
              pixels)  of  [filename]  to  (x,y). If x1=y1=x2=y2=-1, the whole
              [filename] is copied.

       copyresized x1,y1,x2,y2,dx1,dy1,dx2,dy2,[filename]
              Insert the  region  from  (x1,y1)  to  (x2,y2)  (in  pixels)  of
              [filename],  possibly  resized,  to  the  region of (dx1,dy1) to
              (dx2,dy2). If x1=y1=x2=y2=-1, the whole [filename] is copied and

       darrow x1,y1,x2,y2,l,[color]
              (Synonym:   dasharrow   dashedarrow)  Dashed  arrow  (x1,y1)-  -
              ->(x2,y2), where l is the length (in pixels) of arrowhead.

       dhline x,y,[color]
              (Synonym:   dashedhorizontalline    dashhorizontalline    hdline
              horizontaldashedline) Dashed horizontal line through (x,y).

       dline x1,y1,x2,y2,[color]
              (Synonym:    dashedline    dashline)    Dashed    line   segment

       dlines [color],x1,y1,x2,y2,x3,y3...
              (Synonym:  dashedlines)  dashlines  n   dashed   line   segments

       dvline x,y,[color]
              (Synonym:      dashedverticaline     dashverticalline     vdline
              verticaldashedline) Dashed vertical line through (x,y).

       ellipse x,y,w,h,[color]
              Ellipse with center (x,y), width w and height h.

       fcircle x,y,d,[color]
              (Synonym: ball disk filledcircle) Filled circle of center  (x,y)
              and diameter d (in pixels).

       fellipse x,y,w,h,[color]
              (Synonym: filledellipse) Filled ellipse with center (x,y), width
              w and height h.

       fill x,y,[color]
              (Synonym: flood floodfill)  Flood  fill  the  region  containing
              (x,y) with the same original color, by color.

       filltoborder x,y,[color1],[color2]
              Flood  fill by color2 the region containing (x,y) and bounded by

       fpoly [color],x1,y1,x2,y2,x3,y3...
              (Synonym:  filledpoly  filledpolygon  fpolygon)  Filled  polygon

       frect x1,y1,x2,y2,[color]
              (Synonym:    filledrect   fillecrectangle   frectangle)   Filled
              rectangle with corners (x1,y1) and (x2,y2).

       fsquare x,y,s,[color]
              (Synonym: filledsquare) Filled square with sides s  (in  pixels)
              and first corner at (x,y).

       ftriangle x1,y1,x2,y2,x3,y3,[color]
              (Synonym:   filledtriangle)   Filled   triangle   with  vertices

       hline x,y,[color]
              (Synonym: horizontalline) Horizontal line through (x,y).

              Set interlaced image

              Turns off brush selection for line drawing.

              Turns off tile selection for filling.

       lattice x0,y0,x1,y1,x2,y2,n1,n2,[color]
              A lattice of n1xn2 points starting with (x0,y0), with n1 rows in
              direction of (x1,y1) and n2 rows in direction of (x2,y2).

       line x1,y1,x2,y2,[color]
              (Synonym: seg segment) Line segment (x1,y1)---(x2,y2).

       lines [color],x1,y1,x2,y2,x3,y3...
              n line segments (x1,y1)---(x2,y2)---(x3,y3)...

       linewidth w
              Set line width to w (in pixels) for line drawing.

       new x,y
              Set a new image of size x,y.

       output [filename]
              Output the current image to [filename].

       parallel x1,y1,x2,y2,xv,yv,n,[color]
              n   parallel   lines   starting   from  (x1,y1)---(x2,y2),  with
              displacement (xv,yv).

       pixels [color],x1,y1,x2,y2,...
              Points (all of diameter 1) at (x1,y1), (x2,y2), ...

       plot [color],[formula]
              (Synonym: curve) Plot a curve according to [formula]  which  can
              be  either  an  explicit  function of x, or a pair of parametric
              functions in t.

       plotjump j
              Plotted curve willjump is two consecutive points  have  distance
              more  than  j  pixels.  Useful  to  avoid plotting discontinuous
              functions as continuous. Default value: 200.

       plotstep n
              (Synonym: plotsteps  tstep  tsteps)  Set  the  number  of  point
              computations in curve plot. Defaults to 100.

       point x,y,[color]
              A  (fat)  point  at (x,y), whose diameter is equal to linewidth.
              points  [color],x1,y1,x2,y2,...   (Fat)   points   at   (x1,y1),
              (x2,y2), ..., whose diameters are equal to linewidth.

       poly [color],x1,y1,x2,y2,x3,y3...
              (Synonym: polygon) Polygon (x1,y1)-(x2,y2)-(x3,y3)...

       range x1,x2,y1,y2
              Set  the  drawing  range  to  [x1,x2]  horizontally  and [y1,y2]
              vertically.  Note  that  by   default,   horizontal   range   is
              [0,xsize-1] and vertical range is [ysize-1,0].

       rays [color],x0,y0,x1,y1,x2,y2...
              Line segments (x0,y0)---(x1,y1), (x0,y0)---(x2,y2), ...

       rect x1,y1,x2,y2,[color]
              (Synonym: rectangle) Rectangle with corners (x1,y1) and (x2,y2).

       setbrush [filename]
              Use the image [filename] as a brush for all line draws.

       setpixel x,y,[color]
              A point (of diameter 1 pixel) at (x,y).

       setstyle [color1],[color2],...
              Set the line style to color1,color2,...

       settile [filename]
              Use the image [filename] as a tile for all filling commands.

       size x,y
              Set the image  size  to  x  pixels  horizontally  and  y  pixels

       square x,y,s,[color]
              Square with sides s (in pixels) and first corner at (x,y).

       text [color],x,y,[font],[string]
              (Synonym:  print  string  write) Write the string at (x,y), with
              font=small,medium,large or giant.

       textup [color],x,y,[font],[string]
              (Synonym: stringup writeup) Write upwards the string  at  (x,y),
              with font=small,medium,large or giant.

       trange t1,t2
              (Synonym:  ranget)  Set  the  t  range to [t1,t2] for parametric
              curve plotting.  Defaults to [0,1].

       transparent [color]
              Makes [color] a transparent color.

       triangle x1,y1,x2,y2,x3,y3,[color]
              Triangle with vertices (x1,y1),(x2,y2),(x3,y3).

       vline x,y,[color]
              (Synonym: verticalline) Vertical line through (x,y).

       xrange x1,x2
              (Synonym: rangex) Set the horizontal drawing range  to  [x1,x2].
              Defaults to [0,xsize-1].

       yrange y1,y2
              (Synonym:  rangey)  Set the horizontal drawing range to [y1,y2].
              Defaults to [ysize-1,0].


       Flydraw was completely rewritten to replace  a  public  domain  program
       called  Fly  by XIAO Gang from the University of Nice (France) in April