Simple User Manual
Contents
1. 1G clear and set this flag respectively See also the nogrey option If given a numeric argument that is not 0 or 1 greyscale anti aliasing is turned on and the gamma resource is set to the val ue divided by 100 E g 150G turns on greyscale and sets gam ma to 1 5 Ctrl g find next Find the next match string in the DVI file this can be used instead of pressing the Find button in the search window g goto page Moves to the page with the given number page number is given xdvi jumps to the last page If the option resource useTeX pages is active the numbers corre spond the the actual page numbers in the TeX file otherwise absolute page numbers starting from 1 are used In the latter case the page numbers can be changed with the P keystroke below Note that with the useTeXpages option it is possible that the same page number occurs multiple times in such a case xdvi will use the first page number that matches h Pops up a help window with a short explanation of the mo portant key bindings and concepts k set keep flag Normally when xdvi switches pages it mo the home position as well The k keystroke toggles a keep position flag which when set will keep the same position when moving between pages Also Ok and 1k clear and set this flag respectively See also the keep option Ctrl 1 fullscreen toggle Toggles fullscreen mode see the descrip tion of the fullsc2. by 100 negative values are allowed s set shrink factor Changes the shrink factor to the number If no number is given the smallest factor that makes the entire page fit in the window will be used Margins are ignored in this computation T use tex pages Use logical TeX pages the values o 0 register instead of physical pages for the pagelist la bels and when jumping to a page in a document via goto page See also the useTeXpages option t switch magnifier units Switches the units used for th nifier tick marks and for reporting the distance between the mouse pointer and the ruler centre in ruler mode see the sec tion MODES The default value is specified by the X resource tickUnits mm by default The units toggle through the fol lowing values except for px they all correspond to TeX s units mm millimeters pt TeX points in inches sp scaled points the unit used internally by TeX bp big points or Postscript points cc cicero points dd didot points pc pica and px screen pixels Ctrl u back page toggle mark Moves to the previous page and tog gles the mark for that page This is the dual action to Ctrl n u up Moves page up two thirds of a window full With a argument to up moves up the corresponding fraction of a window full Ctrl v show source specials Show bounding boxes for every source spe cial on the current page and print the strings contained i
3. default P overrides declare page number Print the distances shown in the sta tusline to standard output 15
4. disappears when the mouse button is re leased Moving the mouse cursor while holding the button down will move the magnifier In Ruler Mode the first button moves or sets a ruler cross instead see the section MODES below for details Different mouse but tons produce different sized windows as in dicated by the the argument of the magnifier action Its argu ment is either a string of the form widthxheight as in the mgsn command line option or one of the strings 1 through 5 referring to the value specified by the corresponding mgsn op tion Note that in order to assign magnifier actions to the but tons 4 or 5 you need to use the resource wheelTranslations more about this resource below e g xdvi wheelTranslations jBtn4dDownj magnifier 4 j Btn5Down magnifier 5 e Shift Mouse 1 drag e Shift Mouse 2 drag 4 Shift Mouse 3 drag Drags the page with the mouse Shift Mouse 1 allows dragging in all directions Shift Mouse 2 allows vertical drag ging only and Shift Mouse 3 allows horizontal dragging only To access these actions via customization use the drag action This action should have one parameter the character or indicating vertical dragging horizontal drag ging or dragging in both directions Ctrl Mouse 1 source special Holding down the Ctrl key and clicking mouse button 1 starts a reverse search opening the editor at the location in the TeX file co
5. for you to choose the DVI file from If a prefix argument n is given the n th file from the file history is opened instead P declare page number This is page number n This used to make the g keystroke refer to a different page number than the physical page If you want to use logical or TeX page numbers instead of physical pages consider using the op tion useTeXpages instead The argument n should be given as prefix to this key Ctrl p print Opens a popup window for printing the DVI file or parts of it See the section PRINT DIALOG for an explanation of the options available and the resources to customize the de fault behaviour p back page Moves to the previous page or back n p Synonyms are b and Ctrl h q quit Quits the pr Ctrl r forward page 0 Redisplays the current page R reread dvi file Forces the dvi file to be reread Thi lows you to preview many versions of the same file while running xdvi only once r right Moves page right two thirds of a window Ctrl s save Opens a popup window for saving the DVI file or parts of it See the section SAVE DIALOG below for more information on this S set density Sets the density factor to be used when s ing bitmaps This should be a number between 0 and 100 higher numbers produce lighter characters If greyscaling mode is in effect this changes the value of gamma instead The new value of gamma is the given number divided
6. USTOMIZATION below If only a lowercase binding is listed both upper and lowercase keys will work for that binding e ESC key discard number The escape key discards the numerical prefix for all actions useful when you mistyped a number Delete key up or previous Moves down two thirds of a window full or to the top of the previous page if already at the bottom of the page With a float argument moves down the corresponding frac tion of a window full By default the Space key is bound to the action unpause or next which does a similar thing see there The keep flag is ignored by these actions Space key unpause or next Moves down two thirds of a window full or to the next page if already at the bottom of the page When the option pause special string is used and the display is currenlty paused this key will instead display the next portion of the page until the next special string or the end of the page is encountered See the description of the pause option for details e Ctrl Home Xaw Ctrl osfBeginLine Motif goto page 1 Moves to the first page of the document e Ctrl End Xaw Ctrl osfEndLine Motif goto page Moves to the last page of the document e Home Xaw osfBeginLine Motif home or top Move to the home position of the page or to the top of the page if the keep flag is set in this case the page doesn t scroll horizontally e End Xaw osfEndLine Motif end or bott
7. XDVI XDVIK 1 DESCRIPTION Xdvi is a program for previewing dvi files as produced e g by the tex 1 program under the X window system Xdvi can show the file shrunken by various integer factors and it has a magnifying glass for viewing parts of the page enlarged see the section MAG NIFIER below This version of xdvi is also referred to as xdvik since it uses the kpathsea library to locate and generate font files In addition to that it supports the following features e hyperlinks in DVI files section HYPERLINKS e direct rendering of Postscriptjtm Typel fonts section T1LIB source specials in the DVI file section SOURCE SPECIALS string search in DVI files section STRING SEARCH saving or printing parts of the DVI file sections PRINT DIALOG and SAVE DIALOG Before displaying a page of a DVI file xdvi will check to see if the file has changed since the last time it was displayed If this is the case it will reload the file This feature allows you to preview many versions of the same file while running xdvi only once Since it cannot read partial DVI files xdvik versions starting from 22 74 3 will cre ate a temporary copy of the DVI file being viewed to ensure that the file can be viewed without interruptions The notempfile can be used to turn off this feature Xdvi can show PostScriptjtmj specials by any of three methods It will try first to use Display PostScriptjtmj then NeWS then it will try to
8. e page the mouse is located on Mouse 2 toggle mark Toggle the mark of the current page The marks are used by the Print and Save to file dialogs to select on ly marked pages from the DVI file When the mouse pointer is inside the page list the mouse wheel switch es to the next or previous page 6 SCROLLBARS The scrollbars if present behave in the standard way pushing Button 2 in a scrollbar moves the top or left edge of the scrollbar to that point and optionally drags it pushing Button 1 moves the image up or right by an amount equal to the distance from the button press to the upper left hand corner of the window pushing Button 3 moves the image down or left by the same amount The scrollbars can be removed via the expertmode flag keystroke which see Wheel mice are supported motion of the wheel on such a mouse moves the image up or down by the number of pixels indicated by the wheelu nit option To access this option via customization use the wheel ac tion This action takes one parameter giving the distance to scroll the image If the parameter contains a decimal point the distance is given in wheel units otherwise pixels 7 MAGNIFIER By default the mouse buttons 1 to 5 will pop up a magnifying glass that shows an unshrunken image of the page i e an image at the reso lution determined by the option X resource pixels or mfmode at varying sizes When the magnifier is moved small ruler like
9. e types the value of the resource unknownMimeSuffix is used by default appli cation x unknown If the mail cap entries do not list a viewer for a given mime type xdvi will show a warning popup If you want to avoid this warning and for example want to always use the netscape browser for unknown MIME types you could add the following line to your mailcap file application xdvi unknown netscape raise remote openURL 10 STRING SEARCH The keystroke Ctrl f or the menu entry File Find or the Binoc ulars symbol in the toolbar for Motif opens a dialog window to search for a text string or a regular expression in the DVI file The keystroke Ctrl g jumps to the next match like pressing the Find but ton in the search window By default the matches are highlighted in inverted color If the dis play isn t running in TrueColor or if the X resouce matchHighlightIn verted is set 10 to false or the command line option nomatchinverted is used xdvi will instead draw a rectangle in highlight color see the hl option around the match If a match crosses a page boundary only the part on the first page is high lighted Xdvi will scan up to 2 adjacent pages to match strings crossing page boundaries but note that header or footer lines or in tervening float pages will be treated as parts of the scanned text Such text will usually cause multi page matching to fail This emphasizes the fact that searching in the
10. for turning off the greediness of and turing on this option will usually result in matches that are longer than desired The current checkbox settings are saved in the xdvire file 12 11 PRINT DIALOG The print dialog window allows you to print all pages marked pages click or drag Mouse 2 in the page list to mark them or a range of pages Note that the page numbers always refer to physical pages so if you re using the option use TeX pages you may want to disable it to make it easier to determine the correct page numbers or avoid this problem altogether by marking the pages to be printed The value of the Printer text filed is passed to dvips via the o mechanism as a single argument after the Any arguments listed in the Dvips options field are segmeted at whitespaces and passed as sepa rate arguments to dvips If you e g want to print the file 2 up you should enter the following string into the Printer field psnup 2 q lpr Plp There are several resources for customizing the behaviour and the de fault entries of the print dialog itemize dvipsPrinterString dvipsOptionsString These can be used to provide default entries for the Printer and the Dvips options text fields respectively If no paper size is speci fied in the DVI file via e g dvips geometry this is the preferred method the input field is initialized with the current value of the command line option X resource pa per E g t
11. formatted text the DVI out put works differently from searching in the source text Searching in the DVI file makes it easier to skip formatting instructions and makes it possible to search for e g hyphenation and equation numbers but sometimes the format ting results can also get in the way e g in the case of footnotes In these cases it s better to search in the TeX source instead The use of source specials will make switching between the xdvi display and the editor with the TeX source easier see the section SOURCE SPECIALS below for more information on this The text extracted from the DVI file is in encoded in UTF 8 you can view that text by saving the file in UTF 8 format via the File Save as menu item If xdvi has been compiled with locale nllangin fo and iconv support the search term is converted from the character set specified by the current locale into UTF 8 See the output of lo cale a for a list of locale settings available on your system If nllanginfo is not available but iconv is you can specify the input encoding for iconv via the X resource textEncoding see the output of iconv l for a list of valid encodings If iconv support is not avail able only the encodings ISO 8859 1 and UTF 8 are supported these names are case insensitive Ideographic characters from CJKV fonts are treated specially All white space spaces and newlines before and after such characters is ignored in the search string and
12. he option paper a4r is translated into the dvips options t a4 t landscape Note that no check is performed whether dvips actually understands these options it will ignore them if it can t currently not all options used by xdvi are also covered by dvips d dvipsFailHangTime These specify the time in milliseconds that the printing progress window will stay open after the dvips process has ter minated The value of dvipsHangTime is used if the process ter minates successfully dvips FailHangTime is used if it terminates with an error The default values are 1 5 and 5 seconds respec tively If both values are negative the window will stay open until it is closed by the user 12 SAVE DIALOG This dialog allows you to save all or selected marked pages in the cur rent DVI file You can save in one of the following formats e Postscript uses dvips to convert the DVI file to a Postscript file just like when printing to a Postscript file e PDF first uses dvips to convert the DVI file to a Postscript file then uses ps2pdf to convert the Postscript file to PDF 13 e Plain text in ISO 8859 1 or UTF 8 encoding the latter will pre serve more of the special LaTeX characters e g from mathematical mode If a character cannot be displayed in the selected charset it is replaced by followed by the hexadecimal character code If a character is not recognized at all it is replaced by If you think that xdvi should recog
13. he unit of the marks is determined by the X resource tickUnits mm by default This unit can be changed at runtime via the action switch magni fier units by default bound to the keystroke t see the de scription of that key and of switch magnifier units for more details on the units available The length of the tick marks can be changed via the X resource tickLength 4 by default A zero or negative value suppresses the tick marks Text Selection Mode This mode allows you to select a rectangular region of text in the DVI file by holding down Mouse 1 and moving the mouse The text is put into the X primary selection so that it can be past ed into other X applications with Mouse 2 as usual If xdvi has been compiled with locale nl_langinfo and iconv support the selected text is converted into the character set of the current locale see the output of locale a for a list of locale settings available on your system If nllanginfo is not available but iconv is you can specify the input encoding for iconv via the X resource textEncoding see the output of iconv l for a list of valid encodings If iconv support is not available only the encodings ISO 8859 1 and UTF 8 are supported these names 14 are case insensitive Note that UTF 8 is the only encoding that can render all charac ters e g mathematical symbols of a DVI file If ISO 8859 1 is active characters that cannot be displayed are replaced by followed by the he
14. in the DVI file To match a newline character use in the search string to match the string use n If the checkbox Regular Expression is activated the string is treated as a regular expression in extended POSIX syntax with the following properties e a matches a zero or one times e a matches a zero or more times e a matches a one or more times Note that and are greedy i e they match the longest possible substring e The pattern matches any character except for newline To also match a newline use e an matches a exactly n times e an m matches a at least n and no more than m times 11 e a b matches a or b Brackets can be used for grouping e g a b c e The string matched by the nth group can be referenced by e g refers to the first match e The characters nd match the beginning and the end of a line respectively abc matches any of the letters a b c and a z matches all characters from a to z e Each item in a regular expression can also be one of the following POSIX character classes alnum alpha blank cntrl digit graph lower print space wpper These can be negated by inserting a ymbolafterthe firstbrack et l alpha For more details on POSIX regular expressions see e g the IEEE Std 1003 1 standard definition available online from http www opengroup org onlinepubs 007904975 basedefs xbd_ ha
15. ithout a prefix argument all of the mentioned GUI elements are either switched on if they had been invisible before or off Toggling the scrollbars may behave erratically with the Xaw wid gets e g the scrollbars may reappear after resizing the win dow and at certain window sizes one of the scrollbars may fail to disappear See also the option expertmode the numbers above correspond to the bits in the argument to expertmode MOUSE ACTIONS IN THE MAIN WINDOW e Mouse 1 do href magnifier 1 Mouse 2 do href newwindow magnifier 2 Usually if a binding speci fies more then one action all actions are executed in a se quence The hyperlink bindings do href and do href newwindow are special in that they are used as an alternative to other ac tions that might follow them if the mouse is currently located on a hyperlink In this case none of the other actions will be executed Otherwise only the other actions are executed The action do href jumps to the link target in the current xd vi window eventually switching to another page and do href newwin dow opens a new instance of xdvi for the link target In both cases the location of the target is indicated by a small arrow drawn in the same color as a visited link in the left corner of the window e Mouse 3 magnifier 3 The actions magnifier n will pop up a magni fying glass which shows the unshrunk image of the region around the mouse pointer The magnifier
16. n these specials to stderr With prefix 1 show every bounding box on the page This is for debugging purposes mainly V set gs alpha This key toggles the anti aliasi PostScriptjtm specials when Ghostscript is used as renderer In addition the key sequences OV and 1V clear and set this flag respectively See also the gsalpha option v set ps This key toggles the rendering of PostScriptjtm cials between 3 states specials like EPS graphics are displayed specials are displayed along with their bounding box if available only the bounding box is displayed The states can also be selected directly by using lv 2v and Ov respec tively See also the postscript option Ctrl x source what special Display information about the source spe cial next to the mouse cursor in the statusline This is the same special that would be found by source special but with out invoking the editor For debugging purposes x set expert mode Toggles expert mode in which th tusline the scroll bars the menu buttons the toolbar Motif only and the page list are not shown Typing 1x toggles the display of the statusline at the bottom of the window Typing 2x toggles the scrollbars if available For Xaw 3x tog gles the menu buttons and the page list for Motif it toggles the page list In Motif the additional bindings 4x toggle the toolbar and 5x the menu bar W
17. nize a character but doesn t please send a feature request to the address given in AUTHORS be low Likewise if you observe spurious spaces or unwanted line breaks in the output please report this as a bug The programs for Postscript and PDF conversion can be customized via the command line options or X resources dvipspath dvipsPath and ps2pdfpath ps2pdfPath respectively see the explanation of these op tions above for more details 13 MODES The keystroke Ctrl m switch mode switches between three different bindings for Mouse 1 which can also be activated via the Modes menu in Motif this is a submenu of the Options menu called Mouse Mode The default mode at startup can be customized via the X resource mouse Mode or the command line option mousemode The default startup mode is Magnifier Mode Note The modes are implemented by changing the magnifier action Switching the mode will not work if Mouse 1 has been customized to an ac tion sequence that does not contain the magnifier action Magnifier Mode In this mode the mouse buttons 1 to 5 pop up a magnifying glass that shows an unshrunken image of the page ie an im age at the resolution determined by the option X resource pixels or mfmode at varying sizes When the magnifier is moved small ruler like tick marks are displayed at the edges of the magnifi er unless the X resource delayRulers is set to false in which case the tick marks are always displayed T
18. om Move to the end position of the page the lower right hand corner or to the bottom of the page if the keep flag is set in this case the page doesn t scroll horizon tally e Down arrow down 0 015 Scrolls page down e Up arrow up 0 015 Scrolls page up Right arrow right 0 015 Scrolls page right Left arrow left 0 015 Scrolls page left Alt Ctrl change density 25 Increase the darkness of the fonts in the DVI window by adding to the gamma value see also the S keystroke Alt Ctrl change density 25 Decrease the darkness of the fonts in the DVI window by subtracting from the gamma value see also the S keystroke Ctrl set shrink factor Increase the shrink factor see also the s keystroke Ctrl set shrink factor Decrease the shrink factor see also the s keystroke Ctr pagehistory delete backward Delete the current item in the page history and move to the history item before the deleted one With a prefix argument n delete n previous history items See PAGE HISTORY for details pagehistory back Move back in the page history see PAGE HIS TORY for details With a prefix argument n move back n his tory items Ctr pagehistory delete forward Delete the current item in the page history and move to the history item after the deleted one With a prefix argument n delete n next history items See PAGE HISTORY for details pagehistory f
19. orward Move forward in the page history see PAGE HISTORY for details With a prefix argument n move for ward n history items home Movetothe home positionof thepage T hnormallytheupperle ft handcornerofthepage dependingonthemar ginsasdescribedinthe marginsoption above help Same as the h key which B htex back This key jumps back to the previous hyperlin chor See the section HYPERLINKS for more information on navi gating the links b back page Moves to the previous page or back n p Synonyms are p and Ctrl h C set color This key toggles the use of color specials key sequences OC and 1C turn interpretation of color spe cials off and on respectively See also the nocolor option c center Moves the page so that the point currently b the mouse cursor is moved to the middle of the window and warps the mouse cursor to the same place d down Moves page down two thirds of a window full float argument to down moves down the corresponding frac tion of a window full Ctrl f find Pop up a window to search for a string in the DVI file See the section STRING SEARCH below for more details f forward page Moves to the next page or to the nth nex if a number is given Synonyms are n Return and Line Feed G set greyscaling This key toggles the use of greyscale aliasing for displaying shrunken bitmaps In addition the key sequences 0G and
20. p09 html As a non standard extension the following Perl like abbreviations can be used instead of the POSIX classes Symbol Meaning POSIX Class an alphanumeric character alnum a non alphanumeric character l alnum Jladigitcharacter digit anon digitcharacter digit awhitespacecharacter space anon whitespacecharacter space The following characters are special symbols they need to be es caped with in order to match them literally Matches of length zero are silently skipped The dialog also provides checkboxes to search backwards match in a case sensitive manner the default is to ignore case i e a search string Test will match both the strings test and TEST in the DVI file ignore line breaks and hyphens This removes all hyphens at the ends of lines and the following newline characters and replaces all remaining newline characters by white spaces So hyphenated words will appear as one word to the search and a search for two words with a space in between will also match the words if they are separated by a linebreak Note that the hyphen removal may cause unwanted side effects for compound words containing hyphens that are wrapped after the hy phen and that replacing the newlines affects the interpretation of regular expressions as follows The pattern will also match new lines and nd won t match begin and end of lines any more Since currently there is no option
21. reen option for more information on this This is even more flaky than using the command line option There is no universal standard how a window could change its own geometry or window decorations at run time so this will not work with most window managers or desktops Generally it s bet ter to use the window manager controls to change the size or decorations of the xdvi window 1 left Moves page left two thirds of a window M set margins Sets the margins so that the point current der the mouse cursor defines the upper left hand corner of the text in the page Note that the command does not move the im age but only determines the margins for the page switching com mands For details on how the margins are used see the margins option m toggle mark Toggles the mark for the current page i page list When a page is marked it is displayed with a small star next to the page number The marked pages can then be printed or saved to a file A page or several pages can also be marked by clicking or dragging Mouse 2 in the page list Ctrl n toggle mark forward page Toggles the mark for the current page in the page list and moves to the next page This lets you quickly mark a series of subsequent pages n forward page Moves to the next page or to the nth nex if a number is given Synonyms are f Return and Line Feed Ctrl o select dvi file Read a new dvi file A file selection widget is popped up
22. rresponding to the pointer location in the DVI file See the section on SOURCE SPECIALS below for more information on this UNBOUND ACTIONS The following actions are not bound to a key by default but are avail able for customization quit confirm Pops up a confirmation window to quit xdvi To bind it to the q key instead of the default quit action put the follow ing into your Xdefaults file xdvi mainTranslations override j Key q quit confirm down or next Similar to unpause or next Moves down two thirds of a window full or to the next page if already at the bottom of the page shrink to dpi This action takes one required argument It sets the shrink factor to an integer so as to approximate the use of fonts with the corresponding number of dots per inch If xdvi is using fonts scaled for p dots per inch and the argument to shrink to dpi is n then the corre sponding shrink factor is the ratio p n rounded to the nearest integer CUSTOMIZATION Key and mouse button assignments can be changed by setting the main Trans lations resource to a string of translations as defined in the documentation for the X toolkit The actions should take the form of action names listed in the KEYSTROKES and MOUSE ACTIONS sections see xdvi man for further in formation 5 PAGE LIST The scrollable page list on the right of the main window allows you to jump directly to a page in the DVI file Mouse 1 Jumps to th
23. tick marks are displayed at the edges of the magnifier unless the X resource de layRulers is set to false in which case the tick marks will always be displayed The unit of the marks is determined by the X resource tickUnits mm by default This unit can be changed at runtime via the action switch magnifier units by default bound to the keystroke t see the description of that key and of switch magnifier units for more details on the units available The length of the tick marks can be changed via the X resource tick Length 4 by default A zero or negative value suppresses the tick marks 8 PAGE HISTORY Xdvi keeps a history of viewed pages and you can move through the his tory and delete items using the keys pagehistory back page history forward Ctr pagehistory delete backward and Ctr pagehistory delete forward When one of the history commands is used the page history is displayed in the status line at the bottom of the window with the current list item marked by square brackets and a left and right context of at most 10 items File boundaries are marked by The size of the history can be customized with the X resource pageHis torySize the default size is 1000 items If the size is set to 0 the history commands are disabled 9 HYPERLINKS The actions do href and do href newwindow by default bound to Mouse 1 and Mouse 2 if the pointer is currently located on a h
24. use Ghostscript to render the images All of these options depend on additional software to work properly moreover some of them may not be compiled into this copy of xdvi For performance reasons xdvi does not render PostScript specials in the magnifying glass If no file name has been specified on the command line xdvi will try to open the most recently opened file if the file history accessible via the File Open Recent menu is empty or if none of the files in the history are valid DVI files it will pop up a file selector for choosing a file name In previous versions which didn t have a file history the file selector was always used you can set the X resource noFileArgUseHistory to false to get back the old behaviour 2 KEYSTROKES Xdvi recognizes the following keystrokes when typed in its window Each may optionally be preceded by a positive or negative number a prefix argument whose interpretation will depend on the particular keystroke This prefix argu ment can be discarded by pressing the Es cape key If present the Help Prior and Next keys are synonyms for b and P keys respectively The key bindings listed here are those that xdvi assigns by default The names appearing in brackets at the beginning of the descriptions are the names of the actions associated with the keys these can be used to customize the key bindings as explained in more detail in the section C
25. xadecimal character code For other encod ings such characters may trigger iconv error messages If a character is not recognized at all it is replaced by To extract larger portions of text you can alternatively save selected pages or the entire file in text format via the File j Save as menu Ruler Mode This mode provides a simple way of measuring distances on the page When this mode is activated the mouse cursor changes into a thin cross and a larger cross shaped ruler is drawn in the highlight color at the mouse location The ruler doesn t have units attached to it instead the current distance between the ruler and the mouse cursor is continously printed to the sta tusline When activating Ruler Mode the ruler is at first attached to the mouse and can be moved around It can then be positioned at a fixed place by clicking Mouse 1 After that the mouse cursor can be moved to measure the horizontal dx vertical dy and direct shortest dr distance between the ruler center point and the mouse Clicking Mouse 1 again will move the ruler to the current mouse position and holding down Mouse 1 will drag the ruler around In Ruler Mode the following special keybindings extend or re place the default bindings o ruler snap origin Snap the ruler back to the origin coordinate 0 0 t overrides switch magnifier units Toggle between vari ous ruler units which can be specified by the X resource tickUnits mm by
26. yperlink can be used to open the link target in the same window do href or in a new window do href newwindow If the link target is not a file on the local disk xdvi tries to launch a web browser as specified by the browser command line option the BROWSER environment variable or the wwwBrowser X resource in this order to retrieve the document See the description of the BROWSER en vironment variable below for an example setting If the file is a local file xdvi tries to determine if it is a DVI file If it is xdvi will try to display the file otherwise it will try to determine the MIME type of the file and from that an applica tion suitable for opening the file This is done by parsing the files specified by the environment variable EXTENSIONMAPS for a mapping of filename extensions to MIME types and the files determined by the en vironment variable MAILCAPS for a mapping of MIME types to application programs See the descriptions of these variables in the section ENVI RONMENT below for a more detailed description and the default values of these variables If no suitable files are found a set of built in default MIME types and applications is used Xdvi currently uses no heuristics apart from the filename suffix to de ter mine the mime type of a file If a filename has no suffix the value of the resource noMimeSuffix is used by default application x un known If the suf fix doesn t match any of the suffixes in mim
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