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require"imlua"
require"cdlua"
require"cdluaim"
require"iuplua"
require"iupluacd"
function PrintError(func, err)
local msg = {}
msg[im.ERR_OPEN] = "Error Opening File."
msg[im.ERR_MEM] = "Insuficient memory."
msg[im.ERR_ACCESS] = "Error Accessing File."
msg[im.ERR_DATA] = "Image type not Suported."
msg[im.ERR_FORMAT] = "Invalid Format."
msg[im.ERR_COMPRESS] = "Invalid or unsupported compression."
if msg[err] then
print(func..": "..msg[err])
else
print("Unknown Error.")
end
end
function LoadImage(file_name)
local image
local ifile, err = im.FileOpen(file_name)
if not ifile then
PrintError("open", err)
return
end
-- load the first image in the file.
-- force the image to be converted to a bitmap
image, err = ifile:LoadBitmap()
if not image then
PrintError("load", err)
return
end
ifile:Close()
return image
end
dlg = nil -- only one dlg
function ShowImage(file_name)
local image = LoadImage(file_name)
if not image then
return false
end
if dlg then
local old_canvas = dlg.canvas
local old_image = dlg.image
if old_canvas ~= nil then old_canvas:Kill() end
if old_image ~= nil then old_image:Destroy() end
iup.Destroy(dlg)
end
cnv = iup.canvas{}
function cnv:action()
local canvas = dlg.canvas
local image = dlg.image
if (not canvas) then return end
-- posy is top-down, CD is bottom-top.
-- invert scroll reference (YMAX-DY - POSY).
y = self.ymax-self.dy - self.posy
if (y < 0) then y = 0 end
canvas:Activate()
canvas:Clear()
x = -self.posx
y = -y
image:cdCanvasPutImageRect(canvas, x, y, image:Width(), image:Height(), 0, 0, 0, 0)
canvas:Flush()
return iup.DEFAULT
end
function cnv:button_cb()
local file_name = "*.*"
local err
file_name, err = iup.GetFile(file_name)
if err ~= 0 then
return iup.DEFAULT
end
ShowImage(file_name)
return iup.DEFAULT
end
-- Set the Canvas inicial size (IUP will retain this value).
w = image:Width()
h = image:Height()
if (w > 800) then w = 800 end
if (h > 600) then h = 600 end
cnv.rastersize = string.format("%dx%d", w, h)
cnv.border = "no"
cnv.scrollbar = "yes"
cnv.xmax = image:Width()-1
cnv.ymax = image:Height()-1
function cnv:resize_cb(w, h)
self.dx = w
self.dy = h
self.posx = self.posx -- needed only in IUP 2.x
self.posy = self.posy
end
dlg = iup.dialog{cnv}
dlg.title = file_name
dlg.cnv = cnv
dlg.image = image
function dlg:close_cb()
local canvas = self.canvas
local image = self.image
if canvas then canvas:Kill() end
if image then image:Destroy() end
return iup.CLOSE
end
function dlg:map_cb()
canvas = cd.CreateCanvas(cd.IUP, self.cnv)
self.canvas = canvas
self.posx = 0 -- needed only in IUP 2.x
self.posy = 0
end
dlg:show()
cnv.rastersize = nil -- to remove the minimum limit
return true
end
function main(arg)
local file_name = "*.*"
local err
-- Try to get a file name from the command line.
if (arg == nil or table.getn(arg) < 2) then
file_name, err = iup.GetFile(file_name)
if err ~= 0 then
return true
end
else
file_name = arg[1]
end
if not ShowImage(file_name) then
local Try = true
-- If ShowImage returns an error I will try to read another image.
-- I can give up on File Open dlg choosing "Cancel".
while Try do
file_name = "*.*"
file_name, err = iup.GetFile(file_name)
if err ~= 0 then
return true
end
if ShowImage(file_name) then
Try = false
end
end
end
iup.MainLoop()
return true
end
main(arg)
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