Class: PhotoCanvas

Inherits:
TkScrolledCanvas show all
Defined in:
sample/figmemo_sample.rb

Constant Summary collapse

USAGE = 
<<EOT
--- WHAT IS ---
You can write comments on the loaded image, and save it as a Postscipt
file (original image file is not modified). Each comment is drawn as a
set of an indicator circle, an arrow, and a memo text. See the following
how to write comments.
This can save the list of memo texts to another file. It may useful to
search the saved Postscript file by the comments on them.
This may not support multibyte characters (multibyte texts are broken on
a Postscript file). It depends on features of canvas widgets of Tcl/Tk
libraries linked your Ruby/Tk. If you use Tcl/Tk8.0-jp (Japanized Tcl/Tk),
you can (possibly) get a Japanese Postscript file.

--- BINDINGS ---
* Button-1 : draw comments by following steps
    1st - Set center of a indicator circle.
    2nd - Set head position of an arrow.
    3rd - Set tail position of an arrow, and show an entry box.
          Input a memo text and hit 'Enter' key to entry the comment.

* Button-2-drag : scroll the canvas

* Button-3 : when drawing, cancel current drawing

* Double-Button-3 : delete the clicked comment (text, arrow, and circle)
EOT

Constants included from Tk

Tk::AUTO_PATH, Tk::Fontchooser, Tk::INTERP, Tk::JAPANIZED_TK, Tk::LIBRARY_PATH, Tk::MAINLOOP, Tk::PACKAGE_PATH, Tk::RELEASE_DATE, Tk::TCL_LIBRARY_PATH, Tk::TCL_MAJOR_VERSION, Tk::TCL_MINOR_VERSION, Tk::TCL_PACKAGE_PATH, Tk::TCL_PATCHLEVEL, Tk::TCL_PRECISION, Tk::TCL_VERSION, Tk::TK_MAJOR_VERSION, Tk::TK_MINOR_VERSION, Tk::TK_PATCHLEVEL, Tk::TK_VERSION, Tk::Tkextlib_RELEASE_DATE, Tk::TreeCtrl_Widget, Tk::X_Scrollable, Tk::Y_Scrollable

Constants included from Tk::Encoding

Tk::Encoding::BINARY, Tk::Encoding::BINARY_NAME, Tk::Encoding::DEFAULT_EXTERNAL_NAME, Tk::Encoding::DEFAULT_INTERNAL_NAME, Tk::Encoding::ENCODING_TABLE, Tk::Encoding::RubyEncoding, Tk::Encoding::TkCommandNames, Tk::Encoding::UNKNOWN, Tk::Encoding::UTF8_NAME

Constants included from TkCore

TkCore::EventFlag, TkCore::INTERP, TkCore::INTERP_MUTEX, TkCore::INTERP_ROOT_CHECK, TkCore::INTERP_THREAD, TkCore::INTERP_THREAD_STATUS, TkCore::RUN_EVENTLOOP_ON_MAIN_THREAD, TkCore::WIDGET_DESTROY_HOOK, TkCore::WITH_ENCODING, TkCore::WITH_RUBY_VM

Constants included from TkComm

TkComm::GET_CONFIGINFO_AS_ARRAY, TkComm::GET_CONFIGINFOwoRES_AS_ARRAY, TkComm::TkExtlibAutoloadModule, TkComm::Tk_CMDTBL, TkComm::Tk_IDs, TkComm::Tk_WINDOWS, TkComm::USE_TCLs_LIST_FUNCTIONS, TkComm::WidgetClassNames

Constants included from TkUtil

TkUtil::None, TkUtil::RELEASE_DATE

Instance Method Summary collapse

Methods inherited from TkScrolledCanvas

#initialize_composite

Methods included from TkComposite

#cget, #cget_strict, #cget_tkstring, #configinfo, #configure, #database_class, #database_classname, #delegate, #delegate_alias, #epath, #inspect, #option_methods

Methods included from Tk

BinaryString, EncodedString, #Grid, #Pack, #Place, UTF8_String, __create_widget_set__, __disable_toplevel_control__, __import_toplevel_aliases__, __regist_toplevel_aliases__, __remove_toplevel_aliases__, __reset_toplevel_owner__, __set_loaded_toplevel_aliases__, __set_toplevel_aliases__, __toplevel_alias_setup_proc__, _replace_toplevel_aliases, add_kinsoku, backup_current_topdef, bell, bell_on_display, const_missing, current_grabs, cursor_display, default_widget_set, default_widget_set=, define_topalias, define_topobj, delete_kinsoku, destroy, #encoding, #encoding=, errorCode, errorInfo, exit, focus, focus_lastfor, focus_next, focus_prev, focus_to, fromUTF8, grid, grid_forget, has_mainwindow?, load_tcllibrary, load_tclscript, load_tclscript_rsrc, load_tclscript_rsrcid, lower_window, pack, pack_forget, pkgconfig_get, pkgconfig_list, place, place_forget, raise_window, regist_sym_for_loaded_file, replace_topalias, replace_topobj, #root, set_topalias, show_kinsoku, sleep, strictMotif, subst_tk_backslash, subst_utf_backslash, tcl_pkgconfig_get, tcl_pkgconfig_list, thread_update, thread_update_idletasks, tk_pkgconfig_get, tk_pkgconfig_list, toUTF8, to_backslash_sequence, topalias_defined?, toplevel_aliases_on_widget_set, topobj_defined?, ungrid, unload_tcllibrary, unpack, unplace, update, #update, update_idletasks, utf_to_backslash, utf_to_backslash_sequence, wakeup, widget_set_symbols

Methods included from Tk::Encoding

#default_encoding=, #encoding=, #encoding_convertfrom, #encoding_convertto, #encoding_dirs, #encoding_dirs=, #encoding_name, #encoding_names, #encoding_obj, #encoding_objs, #encoding_system=, #encoding_system_name, #encoding_system_obj, #force_default_encoding, #force_default_encoding=, #force_default_encoding?, #tk_encoding_names

Methods included from TkCore

#_tk_call_to_list_core, #after, #after_cancel, #after_idle, #appname, #appsend, #appsend_deny, #appsend_displayof, callback, #callback_break, #callback_continue, #callback_return, #chooseColor, #chooseDirectory, #do_one_event, #event_generate, #getMultipleOpenFile, #getMultipleSaveFile, #getOpenFile, #getSaveFile, #get_eventloop_tick, #get_eventloop_weight, #get_no_event_wait, #inactive, #inactive_displayof, #info, #ip_eval, #ip_eval_with_enc, #ip_eval_without_enc, #ip_invoke, #ip_invoke_with_enc, #ip_invoke_without_enc, #is_mainloop?, #load_cmd_on_ip, #mainloop, #mainloop_exist?, #mainloop_thread?, #mainloop_watchdog, #messageBox, #rb_appsend, #rb_appsend_displayof, #reset_inactive, #reset_inactive_displayof, #restart, #scaling, #scaling_displayof, #set_eventloop_tick, #set_eventloop_weight, #set_no_event_wait, #tk_call, #tk_call_to_list, #tk_call_to_list_with_enc, #tk_call_to_list_without_enc, #tk_call_to_simplelist, #tk_call_to_simplelist_with_enc, #tk_call_to_simplelist_without_enc, #tk_call_with_enc, #tk_call_without_enc, #windowingsystem

Methods included from TkComm

_at, _callback_entry?, _callback_entry_class?, _curr_cmd_id, _fromUTF8, _genobj_for_tkwidget, _next_cmd_id, _toUTF8, array2tk_list, #bind, #bind_all, #bind_append, #bind_append_all, #bind_remove, #bind_remove_all, #bindinfo, #bindinfo_all, bool, image_obj, #install_cmd, install_cmd, list, num_or_nil, num_or_str, number, procedure, simplelist, slice_ary, string, #subst, tk_tcl2ruby, uninstall_cmd, #uninstall_cmd, window

Methods included from TkEvent

#install_bind, #install_bind_for_event_class

Methods included from TkUtil

#_conv_args, _conv_args, #_fromUTF8, #_get_eval_enc_str, _get_eval_enc_str, #_get_eval_string, _get_eval_string, _symbolkey2str, #_symbolkey2str, #_toUTF8, #bool, bool, callback, eval_cmd, #hash_kv, hash_kv, install_cmd, #num_or_nil, num_or_nil, num_or_str, #num_or_str, number, #number, string, #string, uninstall_cmd, untrust

Constructor Details

#initialize(*args) ⇒ PhotoCanvas

Returns a new instance of PhotoCanvas.



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# File 'sample/figmemo_sample.rb', line 83

def initialize(*args)
  super(*args)

  self.highlightthickness = 0
  self.selectborderwidth = 0

  @photo = TkPhotoImage.new
  @img = TkcImage.new(self, 0, 0, :image=>@photo)

  width  = self.width
  height = self.height
  @scr_region = [-width, -height, width, height]
  self.scrollregion(@scr_region)
  self.xview_moveto(0.25)
  self.yview_moveto(0.25)

  @col = 'red'
  @font = 'Helvetica -12'

  @memo_id_num = -1
  @memo_id_head = 'memo_'
  @memo_id_tag = nil
  @overlap_d = 2

  @state = TkVariable.new
  @border = 2
  @selectborder = 1
  @delta = @border + @selectborder
  @entry = TkEntry.new(self, :relief=>:ridge, :borderwidth=>@border,
                       :selectborderwidth=>@selectborder,
                       :highlightthickness=>0)
  @entry.bind('Return'){@state.value = 0}

  @mode = old_mode = 0

  _state0()

  bind('2', :x, :y){|x,y| scan_mark(x,y)}
  bind('B2-Motion', :x, :y){|x,y| scan_dragto(x,y)}

  bind('3'){
    next if (old_mode = @mode) == 0
    @items.each{|item| item.delete }
    _state0()
  }

  bind('Double-3', :widget, :x, :y){|w, x, y|
    next if old_mode != 0
    x = w.canvasx(x)
    y = w.canvasy(y)
    tag = nil
    w.find_overlapping(x - @overlap_d, y - @overlap_d,
                       x + @overlap_d, y + @overlap_d).find{|item|
      ! (item.tags.find{|name|
           if name =~ /^(#{@memo_id_head}\d+)$/
             tag = $1
           end
         }.empty?)
    }
    w.delete(tag) if tag
  }
end

Instance Method Details

#fig_erase ⇒ Object 



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# File 'sample/figmemo_sample.rb', line 264

def fig_erase
  (find_withtag('all') - [@img]).each{|item| item.delete}
end

#get_texts ⇒ Object 



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# File 'sample/figmemo_sample.rb', line 287

def get_texts
  ret = []
  find_withtag('all').each{|item|
    if item.kind_of?(TkcText)
      ret << item[:text]
    end
  }
  ret
end

#load_photo(filename) ⇒ Object 



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# File 'sample/figmemo_sample.rb', line 256

def load_photo(filename)
  @photo.configure(:file=>filename)
end

#modified? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'sample/figmemo_sample.rb', line 260

def modified?
  ! ((find_withtag('all') - [@img]).empty?)
end

#reset_region ⇒ Object 



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# File 'sample/figmemo_sample.rb', line 268

def reset_region
  width = @photo.width
  height = @photo.height

  if width > @scr_region[2]
    @scr_region[0] = -width
    @scr_region[2] = width
  end

  if height > @scr_region[3]
    @scr_region[1] = -height
    @scr_region[3] = height
  end

  self.scrollregion(@scr_region)
  self.xview_moveto(0.25)
  self.yview_moveto(0.25)
end