flydraw - an inline drawing tool

       Flydraw  was  completely  rewritten  to  replace a public domain program called Fly by XIAO Gang from the
       University of Nice (France) in April 2000.

1.0                                               16 June 2002                                        flydraw(1)

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.

   DRAWINGCOMMANDS
       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 red,green,blue.

       animatefra,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).

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

       arcx,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.

       arrowx1,y1,x2,y2,l,[color]
              Arrow (x1,y1)--->(x2,y2), where l is the length (in pixels) of arrowhead.

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

       comment
              Does nothing.

       copyx,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.

       copyresizedx1,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 resized.

       darrowx1,y1,x2,y2,l,[color]
              (Synonym:  dasharrow  dashedarrow)  Dashed  arrow  (x1,y1)- - ->(x2,y2), where l is the length (in
              pixels) of arrowhead.

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

       dlinex1,y1,x2,y2,[color]
              (Synonym: dashedline dashline) Dashed line segment (x1,y1)---(x2,y2).

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

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

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

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

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

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

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

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

       frectx1,y1,x2,y2,[color]
              (Synonym: filledrect  fillecrectangle  frectangle)  Filled  rectangle  with  corners  (x1,y1)  and
              (x2,y2).

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

       ftrianglex1,y1,x2,y2,x3,y3,[color]
              (Synonym: filledtriangle) Filled triangle with vertices (x1,y1),(x2,y2),(x3,y3).

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

       interlace
              Set interlaced image

       killbrush
              Turns off brush selection for line drawing.

       killtile
              Turns off tile selection for filling.

       latticex0,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).

       linex1,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)...

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

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

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

       parallelx1,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.

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

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

       pointx,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)...

       rangex1,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), ...

       rectx1,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.

       setpixelx,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.

       sizex,y
              Set the image size to x pixels horizontally and y pixels vertically.

       squarex,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.

       tranget1,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.

       trianglex1,y1,x2,y2,x3,y3,[color]
              Triangle with vertices (x1,y1),(x2,y2),(x3,y3).

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

       xrangex1,x2
              (Synonym: rangex) Set the horizontal drawing range to [x1,x2]. Defaults to [0,xsize-1].

       yrangey1,y2
              (Synonym: rangey) Set the horizontal drawing range to [y1,y2]. Defaults to [ysize-1,0].

       flydraw - an inline drawing tool

flydraw