update manpage for trapezium modedevel

1 files changed, 45 insertions, 9 deletions

diff --git a/gramscii.1 b/gramscii.1
index b130530..7b5f9d0 100644
--- a/gramscii.1
+++ b/gramscii.1
@@ -1,4 +1,4 @@
-.TH GRAMSCII 1 "19/07/2019" "" ""
+.TH GRAMSCII 1 "28/09/2019" "" ""
 .SH NAME
 gramscii \- simple editor for ASCII box diagrams
 .SH SYNOPSIS
@@ -11,8 +11,8 @@ gramscii
 .SH DESCRIPTION
 .PP
 gramscii is a simple interactive editor to create ASCII box-and-arrows
-diagrams. It uses vi-like keybindings for drawing and editing boxes, 
-arrows, and text.
+diagrams. It uses vi-like keybindings for drawing and editing boxes
+(rectangles, palallelograms, trapezia, triangles), arrows, and text.
 .PP
 .SH OPTIONS
 .TP 5m 
@@ -163,7 +163,7 @@ entered. Useful to include comments in scripts.
 .SS MOVEMENTS
 The following movement commands are available in any mode where cursor
 movements are meaningful, currently only 
-.B move, box, arrow, erase, 
+.B move, box, arrow, parallelogram, trapezium, erase, 
 and 
 .B visual
 (see
@@ -255,7 +255,7 @@ is equivalent to
 ).
 .PP
 Global positioning commands are available in 
-.B box, arrow, visual, parallelogram, 
+.B box, arrow, visual, parallelogram, trapezium, 
 and 
 .B erase
 mode. Notice that
@@ -287,8 +287,9 @@ will move the cursor by 14 steps to the left. Similarily, the command:
 will move the cursor by 7 LONG_STEPs rows down (with the default
 LONG_STEP equal to 5, this will correspond to 35 rows down).
 .PP
-Multipliers can be used whenever a movement command is legal, i.e. in 
-move, box, arrox, visual, and erase mode. So for instance the sequence:
+Multipliers can be used whenever a movement command is legal, i.e. in
+move, box, arrox, parallelogram, trapezium, visual, and erase mode. So
+for instance the sequence:
 .RS
 ggb13l18jb
 .PP
@@ -304,6 +305,7 @@ The currently supported modes are:
 .B move,
 .B box,
 .B parallelogram,
+.B trapezium,
 .B arrow,
 .B erase, 
 .B text,
@@ -373,6 +375,32 @@ and gramscii will return to
 .B move
 mode.
 .TP 7m
+.BI t
+Toggle
+.B trapezium
+mode. All moves in
+.B trapezium 
+mode identify the bounding box of a trapezium (see
+.B MOVEMENTS
+above). A trapezium with a short horizontal side of length zero is a
+triangle, and gramscii knows that. By default, the trapezium is
+isosceles, with the short side up.
+Pressing 
+.B T
+while in trapezium mode toggles the type and orientation of the
+trapezium. Press
+.BI t
+again or 
+.B [ENTER]
+to draw the current trapezium and return to 
+.B move
+mode. If you press
+.B [ESC]
+while in trapezium mode, the current trapezium will be discarded
+and gramscii will return to 
+.B move
+mode.
+.TP 7m
 .BI a
 Toggle 
 .B arrow
@@ -515,7 +543,8 @@ in
 .B box,
 and 
 .B arrow
-mode. The following style commands are available: 
+mode. Some caveats apply to parallelogram and trapezium mode though (see
+BUGS).  The following style commands are available: 
 .TP 5m
 .B .
 (dot) Reset all styles to their default values.
@@ -576,6 +605,8 @@ Current mode. It is one of
 (box),
 .B par
 (parallelogram),
+.B trp
+(trapezium),
 .B arr
 (arrow),
 .B txt
@@ -635,7 +666,12 @@ screen where it starts from. This will be changed in a future release to
 support scrolling and "virtual" screens of any (reasonable) size.
 .PP
 It is not currently possible to change the style of the oblique sides of
-a parallelogram.
+a parallelogram or of a trapezium.
+.PP
+The trapezium routine does not handle well the case of trapezia whose 
+height would yield a negative length for the small horizontal side.
+Nevertheless, an exceptionally creative user might consider this a
+feature, rather than a bug.
 .SH AUTHORS
 gramscii is written and maintained by Vincenzo "KatolaZ" Nicosia
 <katolaz@freaknet.org>. You can use, copy, modify, and redistribute