---
name: "Games::Go::Sgf2Dg::Dg2Mp"
section: "3pm"
platform: "linux"
package: "sgf2dg"
version: "4.252-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Games::Go::Sgf2Dg::Dg2Mp"
---

# Games::Go::Sgf2Dg::Dg2Mp(3pm)

Perl extension to convert Games::Go::Sgf2Dg::Diagrams to John Hobby's MetaPost (which is adapted from Donald Knuth's Metafont).

## NAME

Games::Go::Sgf2Dg::Dg2Mp - Perl extension to convert Games::Go::Sgf2Dg::Diagrams to John Hobby's MetaPost (which is adapted from Donald Knuth's Metafont).

## SYNOPSIS

use Games::Go::Sgf2Dg::Dg2Mp

```
 my $dg2mp = B<Games::Go::Sgf2Dg::Dg2Mp-E<gt>new> (options);
 $dg2mp->convertDiagram($diagram);
```

## DESCRIPTION

A Games::Go::Sgf2Dg::Dg2Mp object converts a Games::Go::Sgf2Dg::Diagram object into a TeX (.tex) and a MetaPost (.mp) file.  The MetaPost file contains figures for each of the diagrams and overstones required to make the complete game diagram.  Running MetaPost (mpost or possibly mp) on the .mp file creates a set of figure files, each of which is an Encapsulated PostScript figure.  Running TeX (tex) on the .tex file creates a .dvi file which tries to include the Encapsulated PostScript figures.  Running dvips on the .dvi file (from TeX) creates the final PostScript (.ps) file containing the complete game diagram.

See 'man mpost' (or possibly 'man 'mp') for more details of the overall MetaPost system and environment.

## NEW

- my $dg2mp = **Games::Go::Sgf2Dg::Dg2Mp-\>new** (?options?)

  A **new** Games::Go::Sgf2Dg::Dg2Mp takes the following options:

- **boardSizeX** =\> number

  - **boardSizeY** =\> number

  Sets the size of the board.

  Default: 19

- **doubleDigits** =\> true \| false

  Numbers on stones are wrapped back to 1 after they reach 100. Numbers associated with comments and diagram titles are not affected.

  Default: false

- **stone\_width** =\> points

  - **stone\_height** =\> points

  The **stone\_width** and **stone\_height** determine the size of the stones and diagrams.

  If **stone\_width** is not explicitly set, it is calculated from the **stone\_fontSize** to allow up to three digits on a stone .  The default **stone\_fontSize** allows for three diagrams (with -coords) per 'letter' page if comments don't take up extra space below diagrams.  If **doubleDigits** is specified, the stones and board are slightly smaller (stone 100 may look a bit cramped).

  If **stone\_height** is not explicitly set, it will be 1.05 \* **stone\_width**, creating a slightly rectangular diagram.

  Default: undef - determined from **stone\_fontSize**

- **coords** =\> true \| false

  Generates a coordinate grid.

  Default: false

- **topLine** =\> number (Default: 1)

  - **bottomLine** =\> number (Default: 19)

  - **leftLine** =\> number (Default: 1)

  - **rightLine** =\> number (Default: 19)

  The edges of the board that should be displayed.  Any portion of the board that extends beyond these numbers is not included in the output.

- **diaCoords** =\> sub { # convert $x, $y to Diagram coordinates }

  This callback defines a subroutine to convert coordinates from `$x`, `$y` to whatever coordinates are used in the Games::Go::Sgf2Dg::Diagram object.  The default **diaCoords** converts 1-based `$x`, `$y` to the same coordinates used in SGF format files.  You only need to define this if you're using a different coordinate system in the Diagram.

  Default:

  ```
      sub { my ($x, $y) = @_;
            $x = chr($x - 1 + ord('a')); # convert 1 to 'a', etc
            $y = chr($y - 1 + ord('a'));
            return("$x$y"); },           # concatenate two letters
  ```

  See also the **diaCoords** method below.

- **print** =\> sub { my ($dg2mp, @tex) = @\_; ... }

  A user defined subroutine to replace the default printing method. This callback is called from the **print** method (below) with the reference to the **Dg2Mp** object and a list of lines that are part of the TeX diagram source.

- **stone\_fontName** =\> 'font' Default: 'cmssbx10'

  Quoting from the discussion on fonts in section 7 of \_A User's Manual for MetaPost\_ (by John D. Hobby):

  "...the new font name should be something that TEX would understand since MetaPost gets height and width information by reading the tfm file. (This is explained in The TEXbook. \[5\] ) It should be possible to use built-in PostScript fonts, but the names for them are system-dependent. Some systems may use rptmr or ps-times-roman instead of Times-Roman. A TEX font such as cmr10 is a little dangerous because it does not have a space character or certain ASCII symbols. In addition, MetaPost does not use the ligatures and kerning information that comes with a TEX font."

- **stone\_fontSize** =\> points

  The stone\_fontSize determines the size of the stones and diagrams. Stone size is chosen to allow up to three digits on a stone.

  If **doubleDigits** is specified, the stones and board are slightly smaller (stone 100 may look a bit cramped).

  Default: 8

## METHODS

- $dg2mp-\>**configure** (option =\> value, ?...?)

  Change Dg2Mp options from values passed at **new** time.

- my $coord = $dg2mp-\>**diaCoords** ($x, $y)

  Provides access to the **diaCoords** option (see above).  Returns coordinates in the converter's coordinate system for board coordinates ($x, `$y`).  For example, to get a specific intersection structure:

  ```
      my $int = $diagram->get($dg2mp->diaCoords(3, 4));
  ```

- $dg2mp-\>**print** ($tex ? , ... ?)

  **print**s raw TeX code to **file** as defined at **new** time. Whether or not **file** was defined, **print** accumulates the TeX code for later retrieval with **converted**. The TeX output filename is derived from the MetaPost filename by changing the .mp extension to .tex.

- $dg2mp-\>**print** ($tex ? , ... ?)

  **print**s raw MetaPost code to MetaPost output file (as defined at -\>**new** or -\>**configure** time).

- my $tex = $dg2mp-\>**converted** ($replacement\_tex)

  Returns the TeX source code converted so far for the **Dg2Mp** object.  If `$replacement_tex` is defined, the accumulated TeX source code is replaced by `$replacement_tex`.

- $dg2mp-\>**comment** ($comment ? , ... ?)

  Inserts the TeX comment character ('%') in front of each line of each comment and **print**s it to **file**.

- my $tex\_source = $dg2mp-\>**convertDiagram** ($diagram)

  Converts a *Games::Go::Sgf2Dg::Diagram* into TeX/MetaPost.  If **file** was defined in the **new** method, the TeX source is dumped into the **file**.tex and the MetaPost source into **file**.mp.  In any case, the TeX source is returned as a string scalar.

- my $tex = $dg2mp-\>**convertText** ($text)

  Converts `$text` into TeX code by changing certain characters that are not available in TeX cmr10 font, and by converting \\n\\n into \\hfil\\break.  **convertText** behavior is modified by **texComments** and **simple** options.

  Returns the converted text.

- $dg2mp-\>**close**

  **print** the TeX closer (\\bye) and close the dg2mp object.  Also closes **file** if appropriate.

## SEE ALSO

- sgf2dg(1)

  Script to convert SGF format files to Go diagrams

## BUGS

Is this a trick question?