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1 files changed, 183 insertions, 0 deletions

diff --git a/html/examples/view.wlua b/html/examples/view.wlua
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index 0000000..60be33e
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+++ b/html/examples/view.wlua
@@ -0,0 +1,183 @@
+require"imlua"
+require"cdlua"
+require"cdluaim"
+require"iuplua"
+require"iupluacd"
+
+function PrintError(func, error)
+  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[error] then
+    print(func..": "..msg[error])
+  else
+    print("Unknown Error.")
+  end
+end
+
+function LoadImage(file_name)
+  local image
+  local ifile, error = im.FileOpen(file_name)
+  if not ifile then
+      PrintError("open", error)
+      return
+  end
+  
+  -- load the first image in the file.
+  -- force the image to be converted to a bitmap
+  image, error = ifile:LoadBitmap()
+  if not image then
+    PrintError("load", error)
+    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 error
+
+    file_name, error = iup.GetFile(file_name)
+    if error ~= 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 error
+  
+  -- Try to get a file name from the command line.
+  if (arg == nil or table.getn(arg) < 2) then
+    file_name, error = iup.GetFile(file_name)
+    if error ~= 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, error = iup.GetFile(file_name)
+      if error ~= 0 then
+        return true
+      end
+      
+      if ShowImage(file_name) then
+        Try = false
+      end
+    end
+  end
+  
+  iup.MainLoop()  
+  return true
+end
+
+main(arg)