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############################################################################
#
# File: scroll.icn
#
# Subject: Program to scroll image
#
# Author: Jon Lipp
#
# Date: November 22, 1996
#
##########################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program displays an image, with scolling.
#
##########################################################################
#
# Links: options, vidgets, vscroll, wopen, xcompat
#
############################################################################
#
# Requires: Version 9 graphics
#
############################################################################
link options
link vidgets, vscroll
link wopen
link xcompat
global win, im_win, view_width, view_height
global scv, sch
procedure main(args)
local opts, file, scrollbar_width, picw, pich, root
opts := options(args, "f:w+h+")
file := \opts["f"] |
stop("Usage: scroll -f file [-w window size/width] [-h window height]")
view_width := \opts["w"] | 300
view_height := \opts["h"] | view_width
scrollbar_width := 15
#
# Load in the bitmap; get the dimensions.
#
im_win := WOpen("canvas=hidden", "image=" || file) |
stop("Couldn't make temporary bitmap.")
picw := WAttrib(im_win, "width")
pich := WAttrib(im_win, "height")
win := WOpen("label=" || file, "size=" ||
(view_width + scrollbar_width + 1) || "," ||
(view_height + scrollbar_width + 1) ) |
stop("*** cannot open file")
root := Vroot_frame(win)
#
# Create two scrollbars.
#
scv := Vvert_scrollbar(root, -1, 0, win, sl_cb, 1,
view_height,scrollbar_width, pich, 0, , view_height)
sch := Vhoriz_scrollbar(root, 0, -1, win, sl_cb, 2, view_width,
scrollbar_width, 0, picw, , view_width)
VResize(root)
#
# Draw the initial view of the pixmap, based on the scrollbar's values.
#
sl_cb(scv, scv.callback.value)
sl_cb(sch, sch.callback.value)
#
# Now get events, pass control to the procedure quit() if an event is not
# captured by a vidget.
#
GetEvents(root, quit, , resize)
end
#
# Terminate the program on a keypress of "q".
#
procedure quit(e)
if e === "q" then stop("End scroll.")
end
procedure resize(root)
VReformat(scv, WAttrib(scv.win, "height") - 15)
VReformat(sch, WAttrib(sch.win, "width") - 15)
end
#
# Copy a portion of the bitmap to the main
# window based on the values of the scrollbars.
#
procedure sl_cb(caller, val)
static vpos, hpos
initial vpos := hpos := 0
(caller.id = 1, vpos := val) | hpos := val
CopyArea(im_win, win, hpos, vpos, view_width, view_height, 0, 0)
end
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