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############################################################################
#
# File: fev.icn
#
# Subject: Program to display text in fisheye view
#
# Author: Clinton L. Jeffery
#
# Date: June 17, 1994
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# A text file browser that employs a fish-eye view. The
# fish-eye view displays text in a larger font in the middle (focus)
# gradually declining to tiny fonts at the top and bottom of the screen.
#
# "q" or ESC to quit. "n" slides the focus down one line
# "p" slides the focus up one line. "w" widens the focus by one.
# "W" narrows the focus by one. Mouse clicks move the focus to the line
# on which the mouse is located; clicking in the left margin moves
# in the file proportional to the mouse's y coordinate in the window.
#
############################################################################
#
# Requires: Version 9 graphics with X11R5 scalable fonts on the X server
#
############################################################################
#
# Links: wopen, xcompat
#
############################################################################
link wopen
link xcompat
procedure main(av)
local slope, fin, win, L, ht, focus, focuswidth, e, base
slope := 2
if av[1] == "-s" then slope := (pop(av), pop(av))
fin := open(av[1]) | stop("no file")
win := WOpen("label=" || av[1], "height=860") | stop("no window")
L := []
every put(L,!fin)
write(*L," lines")
ht := 23
focus := *L/2
focuswidth := 1
fisheye(win,L,focus,ht,slope,,,focuswidth)
repeat {
e := Event(win)
case e of {
"q"|"\e": exit(0)
"n" : focus := *L >= focus+1
"p" : focus := 1 <= focus - 1
"w" : focuswidth +:= 1
"W" : (1 < focuswidth) -:= 1
&lpress|&ldrag|&mpress|&mdrag|&rpress|&rdrag: {
if &x < 17 then {
focus := *L * &y / WAttrib(win,"height")
}
else {
base := WAttrib(win,"height") / 2
focus := moveFocusToMouse(win,L,focus,base,ht,slope,focuswidth)
}
}
default : next
}
fisheye(win,L,focus,ht,slope,,,focuswidth)
}
end
procedure fisheye(w,L,focus,maxht,slope,family,weight,focuswidth)
static fonttable
local past_end, i, splt
initial {
fonttable := table()
}
/focuswidth := 1
/family := "helvetica"
/weight := "bold"
/fonttable[w] := []
past_end := *fonttable[w] + 1
every i := past_end to maxht do {
put(fonttable[w],
XBind(w,"font=-adobe-"||family||"-"||weight||
"-r-normal--"||i||"-*-*-*-*-*-*-*") | stop("no XBind"))
}
EraseArea(w)
splt := WAttrib(w,"height") / 2
viewtop(fonttable[w],L,focus,splt,maxht,slope,focuswidth)
viewbottom(fonttable[w],L,focus+1,splt+maxht,maxht-slope,slope,focuswidth)
FillRectangle(w,0,(focus * WAttrib(w,"height") / *L)-WAttrib(w,"ascent"),
16,WAttrib(w,"fheight"))
DrawLine(w,17,0,17,WAttrib(w,"height") * focuswidth)
end
procedure viewtop(w,L,focus,base,ht,slope,focuswidth)
local wh
wh := WAttrib(w[1],"height") | stop("no WAttrib")
while focus >= 1 & base >= 1 do {
if ht < 1 then ht := 1
GotoXY(w[1],20,base)
writes(w[ht],L[focus])
base -:= ht
if focus > 1 & base / focus < ht & focuswidth <= 1 then
ht -:= slope
focuswidth -:= 1
focus -:= 1
}
if focus < 1 then return 1
return focus
end
procedure viewbottom(w,L,focus,base,ht,slope,focuswidth)
local wh
wh := WAttrib(w[1],"height") | stop("no WAttrib")
while focus <= *L & base <= wh do {
if ht < 1 then ht := 1
GotoXY(w[1],20,base)
writes(w[ht],L[focus])
base +:= ht
if focus < *L & (wh - base) / (*L - focus) < ht & focuswidth <= 1 then
ht -:= slope
focuswidth -:= 1
focus +:= 1
}
if focus > *L then return *L
return focus
end
procedure moveFocusToMouse(w,L,focus,base,ht,slope,focuswidth)
local wh, fh
wh := WAttrib(w,"height") | stop("no WAttrib")
fh := WAttrib(w,"ascent") | stop("no WAttrib")
if &y < base then {
while focus >= 1 & base-fh >= &y do {
if ht < 1 then ht := 1
base -:= ht
if focus > 1 & base / focus < ht & focuswidth <= 1 then
ht -:= slope
focuswidth -:= 1
focus -:= 1
}
}
else {
focus +:= 1
base +:= ht
ht -:= slope
while focus <= *L & base <= &y do {
if ht < 1 then ht := 1
base +:= ht
if focus < *L & (wh - base) / (*L - focus) < ht & focuswidth <= 1 then
ht -:= slope
focuswidth -:= 1
focus +:= 1
}
}
if focus < 1 then return 1
if focus > *L then return *L
return focus
end
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