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|
############################################################################
#
# File: gxplor.icn
#
# Subject: Program to explore graphics facilities
#
# Author: Gregg M. Townsend
#
# Date: July 20, 1998
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Usage: gxplor [-s] [window options]
#
# gxplor is an interactive explorer for experimenting with Icon's
# graphics facilities. Commands read from standard input set window
# attributes or invoke procedures. Result values are reported on
# standard output. Errors are caught when possible.
#
# Here's an example, with commentary at the side, that illustrates
# some of the possibilities:
#
# % gxplor start program; a window appears
# > fg query value of "fg" attribute
# black
# > fg blue set "fg" attribute
# blue
# > linewidth 7 set "linewidth" attribute
# 7
# > drawline 12 20 55 73 a fat blue line appears
# > erasearea clear window
# > fillarea
# [unrecognized] oops -- wrong name
# > fillrectangle
# > pattern query "pattern" attribute
# [failed]
# > pattern grid set it
# grid
# > fillstyle
# solid
# > fillstyle opaque
# error 205: invalid value
# > fillstyle textured set fillstyle
# textured
# > clip 50 50 400 200 set clipping
# > fillrectangle fill clipped area with pattern
# > zoom 40 40 100 100 300 50 200 200
# zoom a region
# > &storage query memory usage
# 0
# 274
# 12184
# > exit exit the program
# %
#
# Input consists of blank-separated words, as shown. If the first
# word is recognized as the name of an attribute, a WAttrib() call is
# made. If it is an Icon keyword, the keyword value is printed.
# Otherwise, the word is treated as a procedure name. Any built-in
# function or linked procedure can be invoked, and procedure names are
# treated as case-insensitive for ease of entry.
#
# If a line begins with an integer, the remainder of the line is
# interpreted as a command to be repeated that number of times.
# Afterwards, the elapsed CPU and wall-clock time is reported;
# these figures include loop and call overhead.
#
# The -s option selects "script" mode: input is echoed on standard
# output, and at EOF the program pauses in WDone().
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
#
# Links: many
#
############################################################################
link graphics
link options
link datetime
link random
link barchart, bitplane, drawcard, decay, imscolor
link psrecord, putpixel, strpchrt, turtle, vsetup
invocable all
$define MaxErrors 100
# main procedure
procedure main(args)
local line, words, n, tm, ck, verb, p, s, w, r, atts, keywds, opts
atts := attnames()
keywds := kwnames()
Window(args)
opts := options(args, "s")
repeat {
# read next line
writes("> ")
line := read() | break
if \opts["s"] then
write(line)
words := crack(line)
# set up for timing, if wanted
if n := integer(words[1]) then {
get(words)
tm := &time
ck := &clock
}
else {
n := 1
tm := ck := &null
}
verb := get(words) | next
&error := MaxErrors
if member(atts, verb) then {
# attribute name
s := verb || "="
every w := !words do
s ||:= (\w | "") || " "
s := trim(s, ' =')
every 2 to n do
WAttrib(s)
r := image(WAttrib(s)) | "[failed]"
}
else if member(keywds, verb) then {
# keyword name
every kwval(verb, n - 1)
s := &null
every write(s := image(kwval(verb, 1)))
if /s then write("[failed]")
r := "window" # inhibit later result printing
}
else if p := getproc(verb) then {
# procedure call
dialog_value := &null
every 2 to n do
p ! words
r := image(p ! words) | "[failed]"
r ||:= " (dialog_value = " || image(\dialog_value) || ")"
}
else {
r := "[unrecognized]"
tm := ck := &null
}
# calculate elapsed time
if \tm then {
WSync()
tm := &time - tm
ck := clkdiff(&clock, ck)
}
# report result or error
if &error = MaxErrors then {
# no error occurred
if not (r ? ="window") then
write(r)
}
else if &error = MaxErrors - 1 then {
# an error occurred
write("error ", &errornumber, ": ", &errortext)
write("offending value: ", &errorvalue)
}
else {
# error conversion led to a second error;
# original information has been lost
write("error (details lost)")
}
# write timing results
write("n=", n, " time=", \tm / 1000.0, " clock=", \ck)
&error := 0
}
# at EOF, if called with -s option, wait for "Q" in window
if \opts["s"] then {
write("EOF")
WDone()
}
end
# crack(s) -- parse line, returning list of words
procedure crack(s)
local words
words := []
s ? {
tab(many(' \t'))
while not pos(0) do {
put(words, tab(upto(' \t') | 0))
tab(many(' \t'))
}
}
return words
end
# getproc(s) -- get procedure named s, case insensitive
procedure getproc(s)
local p, f, line, tname
static proctab
initial {
# put every builtin function in the table
proctab := table()
every p := function() do
proctab[map(p)] := proc(p)
# open a temporary file to get procedure names
randomize()
tname := "gxp" || right(?99999, 5, "0") || ".tmp"
$ifdef _UNIX
tname := "/tmp/" || tname
$endif
f := open(tname, "crw") | stop("can't open ", tname)
# put every linked procedure in the table
display(0, f)
seek(f, 1)
while line := read(f) do line ? {
tab(upto('=')) | next
tab(many('= '))
="procedure" | next
tab(many(' '))
p := trim(tab(0))
proctab[map(p)] := proc(p)
}
close(f)
remove(tname)
}
return \proctab[map(s)]
end
# attnames() -- return set of known attribute names
procedure attnames()
return set([
"ascent", "bg", "canvas", "ceol", "cliph", "clipw", "clipx", "clipy",
"col", "columns", "cursor", "depth", "descent", "display",
"displayheight", "displaywidth", "drawop", "dx", "dy", "echo", "fg",
"fheight", "fillstyle", "font", "fwidth", "gamma", "geometry", "height",
"iconic", "iconimage", "iconlabel", "iconpos", "image", "label",
"leading", "lines", "linestyle", "linewidth", "pattern", "pointer",
"pointercol", "pointerrow", "pointerx", "pointery", "pos", "posx",
"posy", "resize", "reverse", "row", "rows", "size", "visual", "width",
"windowlabel", "x", "y"])
end
# kwnames() -- return set of known keyword names
procedure kwnames()
return set([
"&allocated", "&ascii", "&clock", "&col", "&collections",
"&control", "&cset", "¤t", "&date", "&dateline", "&digits",
"&dump", "&e", "&error", "&errornumber", "&errortext", "&errorvalue",
"&errout", "&fail",
"&features", "&file", "&host", "&input", "&interval", "&lcase", "&ldrag",
"&letters", "&level", "&line", "&lpress", "&lrelease", "&main", "&mdrag",
"&meta", "&mpress", "&mrelease", "&null", "&output", "&phi", "&pi",
"&pos", "&progname", "&random", "&rdrag", "®ions", "&resize", "&row",
"&rpress", "&rrelease", "&shift", "&source", "&storage", "&subject",
"&time", "&trace", "&ucase", "&version", "&window", "&x", "&y"])
end
# kwval(name, n) -- generate values of a keyword n times
procedure kwval(name, n)
case name of {
"&allocated": every 1 to n do suspend &allocated
"&ascii": every 1 to n do suspend &ascii
"&clock": every 1 to n do suspend &clock
"&col": every 1 to n do suspend &col
"&collections": every 1 to n do suspend &collections
"&control": every 1 to n do suspend &control
"&cset": every 1 to n do suspend &cset
"¤t": every 1 to n do suspend ¤t
"&date": every 1 to n do suspend &date
"&dateline": every 1 to n do suspend &dateline
"&digits": every 1 to n do suspend &digits
"&dump": every 1 to n do suspend &dump
"&e": every 1 to n do suspend &e
"&error": every 1 to n do suspend &error
"&errornumber": every 1 to n do suspend &errornumber
"&errortext": every 1 to n do suspend &errortext
"&errorvalue": every 1 to n do suspend &errorvalue
"&errout": every 1 to n do suspend &errout
"&fail": every 1 to n do suspend &fail
"&features": every 1 to n do suspend &features
"&file": every 1 to n do suspend &file
"&host": every 1 to n do suspend &host
"&input": every 1 to n do suspend &input
"&interval": every 1 to n do suspend &interval
"&lcase": every 1 to n do suspend &lcase
"&ldrag": every 1 to n do suspend &ldrag
"&letters": every 1 to n do suspend &letters
"&level": every 1 to n do suspend &level
"&line": every 1 to n do suspend &line
"&lpress": every 1 to n do suspend &lpress
"&lrelease": every 1 to n do suspend &lrelease
"&main": every 1 to n do suspend &main
"&mdrag": every 1 to n do suspend &mdrag
"&meta": every 1 to n do suspend &meta
"&mpress": every 1 to n do suspend &mpress
"&mrelease": every 1 to n do suspend &mrelease
"&null": every 1 to n do suspend &null
"&output": every 1 to n do suspend &output
"&phi": every 1 to n do suspend &phi
"&pi": every 1 to n do suspend &pi
"&pos": every 1 to n do suspend &pos
"&progname": every 1 to n do suspend &progname
"&random": every 1 to n do suspend &random
"&rdrag": every 1 to n do suspend &rdrag
"®ions": every 1 to n do suspend ®ions
"&resize": every 1 to n do suspend &resize
"&row": every 1 to n do suspend &row
"&rpress": every 1 to n do suspend &rpress
"&rrelease": every 1 to n do suspend &rrelease
"&shift": every 1 to n do suspend &shift
"&source": every 1 to n do suspend &source
"&storage": every 1 to n do suspend &storage
"&subject": every 1 to n do suspend &subject
"&time": every 1 to n do suspend &time
"&trace": every 1 to n do suspend &trace
"&ucase": every 1 to n do suspend &ucase
"&version": every 1 to n do suspend &version
"&window": every 1 to n do suspend &window
"&x": every 1 to n do suspend &x
"&y": every 1 to n do suspend &y
}
end
# clkdiff(a, b) -- return difference in seconds between two &clock values
#
# If a < b, the time is assumed to have wrapped past midnight.
procedure clkdiff(a, b)
local t
t := ClockToSec(a) - ClockToSec(b)
if t < 0 then
t +:= ClockToSec("24:00:00")
return t
end
|
