# canvasprintbox - Create and manipulate a canvas print box widget

## SYNOPSIS

canvasprintbox pathName ?options?

## INHERITANCE

itk::Widget <- Canvasprintbox

## STANDARD OPTIONS

activeBackground foreground insertBackground insertWidth selectBackground | background highlightBackground insertBorderWidth relief selectBorderWidth | borderWidth highlightColor insertOffTime repeatDelay selectForeground | cursor highlightThickness insertOnTime repeatInterval

See the "options" manual entry for details on the standard options.

## ASSOCIATED OPTIONS

## WIDGET-SPECIFIC OPTIONS

    Name:                   filename
    Class:                  FileName
    Command-Line Switch:	-filename

The file to write the postscript output to (Only when output is set to "file"). If posterizing is turned on and hpagecnt and/or vpagecnt is more than 1, x.y is appended to the filename where x is the horizontal page number and y the vertical page number.

    Name:                   hpagecnt
    Class:                  PageCnt
    Command-Line Switch:	-hpagecnt

Is used in combination with posterize to determine over how many pages the output should be distributed. This attribute specifies how many pages should be used horizontaly. Any change to this attribute will automatically update the "stamp". Defaults to 1.

    Name:                   orient
    Class:                  Orient
    Command-Line Switch:	-orient

Determines the orientation of the output to the printer (or file). It can take the value "portrait" or "landscape" (default). Changes to this attribute will be reflected immediately in the "stamp". Defaults to "landscape" but will be changed automaticaly to the value deemed appropiate for the current canvas. Setting this attribute when the canvasprintbox is first constructed (instead of using the "configure" method) will turn off the auto adjustment of this attribute.

    Name:                   output
    Class:                  Output
    Command-Line Switch:	-output

Specifies where the postscript output should go: to the printer or to a file. Can take on the values "printer" or "file". The corresponding entry-widget will reflect the contents of either the printcmd attribute or the filename attribute. Defaults to "printer".

    Name:                   pageSize
    Class:                  PageSize
    Command-Line Switch:	-pagesize

The pagesize the printer supports. Changes to this attribute will be reflected immediately in the "stamp". Defaults to "a4".

    Name:                   posterize
    Class:                  Posterize
    Command-Line Switch:	-posterize

Indicates if posterizing is turned on or not. Posterizing the output means that it is possible to distribute the output over more than one page. This way it is possible to print a canvas/region which is larger than the specified pagesize without stretching. If used in combination with stretching it can be used to "blow up" the contents of a canvas to as large as size as you want (See attributes: hpagecnt and vpagecnt). Any change to this attribute will automatically update the "stamp". Defaults to 0.

    Name:                   printCmd
    Class:                  PrintCmd
    Command-Line Switch:	-printcmd

The command to execute when printing the postscript output. The command will get the postscript directed to its standard input (Only when output is set to "printer"). Defaults to "lpr".

    Name:                   printRegion
    Class:                  PrintRegion
    Command-Line Switch:	-printregion

A list of four coordinates specifying which part of the canvas to print. An empty list means that the canvas' entire scrollregion should be printed. Any change to this attribute will automatically update the "stamp". Defaults to an empty list.

    Name:                   stretch
    Class:                  Stretch
    Command-Line Switch:	-stretch

Determines if the output should be stretched to fill the page (as defined by the attribute pagesize) as large as possible. The aspect-ratio of the output will be retained and the output will never fall outside of the boundaries of the page. Defaults to 0 but will be changed automaticaly to the value deemed appropiate for the current canvas. Setting this attribute when the canvasprintbox is first constructed (instead of using the "configure" method) will turn off the auto adjustment of this attribute.

    Name:                   vPageCnt
    Class:                  PageCnt
    Command-Line Switch:	-vpagecnt

Is used in combination with "posterize" to determine over how many pages the output should be distributed. This attribute specifies how many pages should be used verticaly. Any change to this attribute will automatically update the "stamp". Defaults to 1.

## DESCRIPTION

Implements a print box for printing the contents of a canvas widget to a printer or a file. It is possible to specify page orientation, the number of pages to print the image on and if the output should be stretched to fit the page. Options exist to control the appearance and actions of the widget.

## METHODS

The canvasprintbox command creates a new Tcl command whose name is pathName. This command may be used to invoke various operations on the widget. It has the following general form:

    pathName option ?arg arg ...?

Option and the args determine the exact behavior of the command. The following commands are possible for canvasprintbox widgets:

## WIDGET-SPECIFIC METHODS

pathName cget option

  Returns the current value of the configuration option given by option. Option may have any of the values accepted by the canvasprintbox command.
  pathName configure ?option? ?value option value ...?
    Query or modify the configuration options of the widget. If no option is specified, returns a list describing all of the available options for pathName (see Tk_ConfigureInfo for information on the format of this list). If option is specified with no value, then the command returns a list describing the one named option (this list will be identical to the corresponding sublist of the value returned if no option is specified). If one or more option-value pairs are specified, then the command modifies the given widget option(s) to have the given value(s); in this case the command returns an empty string. Option may have any of the values accepted by the canvasprintbox command.
  pathName getoutput
    Returns the value of the printercmd or filename option depending on the current setting of output.
  pathName print
    Perfrom the actual printing of the canvas using the current settings of all the attributes. Returns a boolean indicating wether the printing was successful or not.
  pathName refresh
    Retrieves the current value for all edit fields and updates the stamp accordingly. Is useful for Apply-buttons.
  pathName setcanvas canvas
    This is used to set the canvas that has to be printed. A stamp-sized copy will automatically be drawn to show how the output would look with the current settings.
  pathName stop
    Stops the drawing of the "stamp". I'm currently unable to detect when a Canvasprintbox gets destroyed or withdrawn. It's therefore advised that you perform a stop before you do something like that.

  ## COMPONENTS

      Name:                   prtflentry
      Class:                  Entry

  The prtflentry component is the entry field for user input of the filename or printer command (depending on the value of output).

      Name:                   hpcnt
      Class:                  Entry

  The hpcnt component is the entry field for user input of the number of pages to use horizontaly when posterize is turned on.

      Name:                   vpcnt
      Class:                  Entry

  The vpcnt component is the entry field for user input of the number of pages to use verticaly when posterize is turned on.

  ## EXAMPLE

      canvasprintbox .fsb -orient landscape -stretch 1
      pack .fsb -padx 10 -pady 10 -fill both -expand yes

  ## AUTHOR

  Tako Schotanus

  Tako.Schotanus@bouw.tno.nl

  ## KEYWORDS

  canvasprintbox, widget