gview(1) - Plan 9 from User Space

From adc93f6097615f16d57e8a24a256302f2144ec4e Mon Sep 17 00:00:00 2001 From: rsc Date: Fri, 14 Jan 2005 17:37:50 +0000 Subject: cut out the html - they're going to cause diffing problems. --- man/man1/gview.html | 155 ---------------------------------------------------- 1 file changed, 155 deletions(-) delete mode 100644 man/man1/gview.html (limited to 'man/man1/gview.html') diff --git a/man/man1/gview.html b/man/man1/gview.html deleted file mode 100644 index 6abdc7da..00000000 --- a/man/man1/gview.html +++ /dev/null @@ -1,155 +0,0 @@ - -gview(1) - Plan 9 from User Space - - - - -

GVIEW(1) GVIEW(1) -

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NAME
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- - gview – interactive graph viewer
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SYNOPSIS
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- - gview [ −l logfile ] [ −m ] [ file ]
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DESCRIPTION
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- - Gview reads polygonal lines or a polygonal line drawing from an - ASCII input file (which defaults to standard input), and views - it interactively, with commands to zoom in and out, perform simple - editing operations, and display information about points and polylines. - The editing commands can change the color and - thickness of the polylines, delete (or undelete) some of them, - and optionally rotate and move them. It is also possible to generate - an output file that reflects these changes and is in the same - format as the input. -
- - Since the move and rotate commands are undesirable when just viewing - a graph, they are only enabled if gview is invoked with the −m - option. -
- - Clicking on a polyline with button 1 displays the coordinates - and a t value that tells how far along the polyline. (t=0 at the - first vertex, t=1 at the first vertex, t=1.5 halfway between the - second and third vertices, etc.) The −l option generates a log - file that lists all points selected in this manner. -
- - The most important interactive operations are to zoom in by sweeping - out a rectangle, or to zoom out so that everything currently being - displayed shrinks to fit in the swept-out rectangle. Other options - on the button 3 menu are unzoom which restores the coordinate - system to the default state where everything fits on - the screen, recenter which takes a point and makes it the center - of the window, and square up which makes the horizontal and vertical - scale factors equal. -
- - To take a graph of a function where some part is almost linear - and see how it deviates from a straight line, select two points - on this part of the graph (i.e., select one with button 1 and - then select the other) and then use the slant command on the button - 3 menu. This slants the coordinate system so that the line - between the two selected points appears horizontal (but vertical - still means positive y). Then the zoom in command can be used - to accentuate deviations from horizontal. There is also an unslant - command that undoes all of this and goes back to an unslanted - coordinate system. -
- - There is a recolor command on button 3 that lets you select a - color and change everything to have that color, and a similar - command on button 2 that only affects the selected polyline. The - thick or thin command on button 2 changes the thickness of the - selected polyline and there is also an undo command for such - edits. -
- - Finally, button 3 had commands to read a new input file and display - it on top of everything else, restack the drawing order (in case - lines of different color are drawn on top of each other), write - everything into an output file, or exit the program. -
- - Each polyline in an input or output file is a space-delimited - x y coordinate pair on a line by itself, and the polyline is a - sequence of such vertices followed by a label. The label could - be just a blank line or it could be a string in double quotes, - or virtually any text that does not contain spaces and is on a - line by itself. The - label at the end of the last polyline is optional. It is not legal - to have two consecutive labels, since that would denote a zero-vertex - polyline and each polyline must have at least one vertex. (One-vertex - polylines are useful for scatter plots.)
- If the label after a polyline can contains the word Thick or a - color name (Red, Pink, Dkred, Orange, Yellow, Dkyellow, Green, - Dkgreen, Cyan, Blue, Ltblue, Magenta, Violet, Gray, Black, White), - whichever color name comes first will be used to color the polyline. - -
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EXAMPLE
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- - To see a graph of the function y=sin(x)/x generate input with - an awk script and pipe it into gview:
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- - awk 'BEGIN{for(x=.1;x<500;x+=.1)print x,sin(x)/x}' | gview - -
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SOURCE
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- - /usr/local/plan9/src/cmd/draw/gview.c - -
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SEE ALSO
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- - awk(1)
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BUGS
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- - The user interface for the slant command is counter-intuitive. - Perhaps it would be better to have a scheme for sweeping out a - parallelogram.
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