Synopsis
		sfvppen gridnum= gridsize= colormask= red= green= blue= dumb=n blast=y bit=0 grid=-1 xsize=0. ysize=0. big= vpstyle= mono=n endpause= cachepipe= shade= wantras= window= frame= overlay= invras= txsquare= serifs= background= redpow=1.0 greenpow=1.0 bluepow=1.0 dither= greyc=1.0 pixc=1.0 txfont= txprec= txovly= xcenter= ycenter= patternmult=1. pause=0 fatmult= rotate=0 txscale=1.0 mkscale=1.0 dashscale=1.0 scale=1.0 xscale=1.0 yscale=1.0 xshift=0. yshift=0. xwmax= ywmax= xwmin= ywmin= fat=0 gridnum= stat=n out#= align= outN= erase= break= interact= style= size=

Although it is perhaps not obvious, this program can be used to
"Capture the screen". Ie, you play with Pen options until you
get something you like, and then you can use those options with
this program to make a new vplot file that without any options
will draw the same thing.

Parameters
		string align= aligns plot accoording to xy: x is one of l, r, c, u for left, right, center, unaligned y is one of b, t, c, u for bottom, top, center, unaligned. In all cases the given point is aligned to have coordinate zero.   bool background= [y/n]   bool big= [y/n] if y, expand the size of the device's screen (and hence outermost clipping window) to nearly infinity (bad for rotated style!)   int bit=0 if > 0, then bit raster is used with bit the color   bool blast=y [y/n] if y, don't try to compact the output. If n, compaction will be done. Compaction does run-length encoding and compacts repeated lines. Compaction can make the vplot file considerably smaller, but it also takes longer to create the file.   floats blue= [4]   float bluepow=1.0   string break=   bool cachepipe= [y/n]   bools colormask= [5]   float dashscale=1.0   int dither= dithering to improve raster display, see "man vplotraster" 0 No dither, 1 Random Dither 2 Ordered Dither 3 Minimized Average Error Method 4 Digital Halftoning   bool dumb=n [y/n] if y, causes output to only be vectors, erases, and color changes   bool endpause= [y/n]   string erase=   int fat=0 base line fatness   float fatmult=   bool frame= [y/n]   floats green= [4]   float greenpow=1.0   float greyc=1.0 "grey correction" modifies the grey scale used to display a raster to simulate the nonlinearity of displays, see "man vplotraster"   int grid=-1 turns on drawing a grid, with the specified fatness   ints gridnum= grids the screen, each part has gridsize=xwidth,ywidth numy defaults to numx. [xy]size default to [xy]screensize / num[xy] [2]   floats gridsize= [2]   string interact=   bool invras= [y/n]   float mkscale=1.0   bool mono=n [y/n] no color   string out#= redirect frame # to corresponding file   string outN=   bool overlay= [y/n]   float patternmult=1.   int pause=0   float pixc=1.0 "pixel correction" controls alteration of the grey scale, see "man vplotraster".   floats red= [4]   float redpow=1.0   int rotate=0   float scale=1.0   bool serifs= [y/n]   bool shade= [y/n]   string size=   string stat= if y, print plot statistics; if l, insert extra spaces   string style=   int txfont=   int txovly=   int txprec=   float txscale=1.0   bool txsquare= [y/n]   bool vpstyle= [y/n] if n, omit declaring absolute style in the output file   bool wantras= [y/n]   bool window= [y/n]   float xcenter=   float xscale=1.0   float xshift=0.   float xsize=0.   float xwmax=   float xwmin=   float ycenter=   float yscale=1.0   float yshift=0.   float ysize=0. scale the vplot image to fit within a given size rectangle   float ywmax=   float ywmin=