Free software released under the GNU Affero General Public License. Some bundled assets are copyright by other authors and available under Creative Commons licensing terms. See "Copying and License" section for further details.

User Notes

BesoGo can be used as a web-based SGF editor, an embeddable SGF viewer, or a board diagram renderer

Online usage

SGF editor based on the latest code snapshot at http://yewang.github.io/besogo/testing.html

With realistic board rendering http://yewang.github.io/besogo/testing.html?theme=wood&realstones=on

Other experimental themes include:

SGF editor based on the latest release (lagging behind the latest snapshot) at http://yewang.github.io/besogo/stable.html

Offline usage

Download the source distribution and open testing.html

left previous node
right next node
page up jump back 10 nodes
page down jump forward 10 nodes
home jump to first node
end jump to last node
delete remove current branch

Shift-clicking with the auto-move/navigate tool will jump to the move that plays at that point

When entering moves, overwrite, suicide, and basic ko moves are not allowed, but can be enabled by holding down ctrl while clicking

BesoGo supports the SGF standard for Go game records. BesoGo should always output SGF files that comply with the standard (besides the exceptions listed below). BesoGo permissively imports SGF file input, allowing many common SGF syntax errors, while attempting to fix any issues and converting to valid SGF on output.

Exceptions in SGF standard support

Some properties are unsupported and ignored:
- Time left OB, OW, BL, WL
- Move annotations BM, DO, IT, TE
- Control annotations KO, MN, PL
- Some general annotations DM, GB, GW, HO, N , UC, V
- Some markup AR, LN, TB, TW, DD, FG, PM, VW
No special validation is performed on game info properties: PB, BR, BT, PW, WR, WT, HA, KM, RU, TM, OT, DT, EV, GN, PC, RO, ON, RE, AN, CP, SO, US. All are merely treated as "simple text" (all whitespace converted to spaces), except for GC which is treated as text (allowing new lines and spaces).
Some root properties (FF, GM, CA, AP) are ignored on file input and set to fixed values on output.

Web Dev Guide

See http://yewang.github.io/besogo/ and http://yewang.github.io/besogo/fixedSize.html for some examples of how to embed BesoGo

To embed BesoGo editor/viewer in your website

Link the style sheet css/besogo.css and one of the css/board-*.css sheets, which select different board themes (simple, flat, book, dark, wood, etc.). These sheets provide essential rendering parameters and can be modified to customize the layout and style.
Include the combined and minified javascript file besogo-all-min.js.
Add divs with the class besogo-editor, besogo-viewer, or besogo-diagram, e.g.,
```
<div class="besogo-editor"></div>
<div class="besogo-viewer" sgf="gameRecord.sgf"></div>
<div class="besogo-diagram" panels="comment">
(;FF[4]GM[1]SZ[9]AB[bb:dd]AW[ee][ff][gg]
C[This diagram shows a 9x9 board with 9 black stones and 3 white stones placed on it.
Be sure to properly escape HTML special characters such as &gt;, &lt;, etc.])</div>
```
Call the auto-initialization function besogo.autoInit() to create widgets for the above divs.

The contents of the div should either be empty or contain SGF text. If SGF text is detected (by starting with "(;", ignoring whitespace), it will be loaded into BesoGo. BesoGo will remove all children from the div and then insert sub-divs building up the GUI.

Security Warning: If your site inserts user-input SGF text directly into the inner HTML of a div, remember to escape any HTML special characters ("<", ">", "&") to avoid XSS vulnerabilities. BesoGo will properly load the intended characters. This is not a security vulnerability within BesoGo, but rather a reminder to use secure practices in your surrounding code.

Options settable via div attributes

sgf sets the URL (from same domain or server with CORS enabled) of the SGF file to load. If an URL is provided, BesoGo ignores the text within the div.
size sets the size of the empty board loaded if no SGF text or URL is provided. Square sizes can be specified by a single number (e.g., "19", "13") and rectangular sizes are specified by two numbers separated by a colon (e.g., "9:15"). Sizes from "1:1" to "52:52" are supported.
realstones sets board rendering to use realistic stone images if set to a truthy value. Otherwise, defaults to flat SVG stones.
shadows selects whether shadows will be added beneath the stones. If omitted or set to auto, shadows will be added for realistic stones, but not for SVG stones. If set to off, shadows will not be added. If set to any other truthy value, shadows will always be added.
coord sets the initial coordinate system, which is by default none, and can be choosen from the following options:
- none no coordinate labels
- western chess-style coordinates using numbers and letters
- eastern coordinates using numbers and CJK symbols
- numeric coordinates using only numbers
- corner corner-relative system using numbers and letters
- eastcor corner-relative system using numbers and CJK symbols
panels plus-separated list of which GUI elements are added in the GUI. The following panels are supported:
- control navigation control buttons
- names player names, ranks, and captures
- comment comments and game info
- tool editing tool selector buttons
- tree game tree visualization
- file save, load, and new board buttons
tool sets the selected tool.
variants sets the variant style, formatted as number 0-3 according to SGF standard.
path string to set the initial position in the game tree of the loaded SGF. The letter N or n sets to next mode. The letter B or b sets to branch mode. One or more digits specifies the number of nodes to move forward always taking the first child (when in next mode), or the child to select (when in branch mode). All other characters are ignored but used to separate numbers. Next is the default mode. Zero in branch mode selects the last child. Examples:
- 20 moves to the 21st node in the mainline of the game tree, which typically contains the 20th move assuming no move in the root and no empty/setup nodes besides the root.
- n5b1b1-1z1-1n10 does the same as 20, but overly verbose and redundant.
- b2,3,0,1 navigates following the 2nd child, 3rd child, last child, and first child over four steps.
nokeys turns off navigation key bindings if set to a truthy value. Otherwise, by default, navigation keys are enabled and the tabindex attribute of the container div is set to 0 (to enable keypress focus), if not already set.
nowheel turns off mousewheel navigation if set to a truthy value. Otherwise, by default, mousewheel navigation is enabled.
resize sets the resizing behavior of the widget, defaulting to auto if not set, with the following options:
- auto is the default responsive resizing behavior, which depends on the settings of the following companion parameters
  - orient can be set to landscape, portrait, auto or view
    - portrait or landscape fixes the orientation of the widget as specified
    - auto is the default behavior, which switches from landscape to portrait if the parent container width is less than transwidth
    - view is the same as auto, but also switches from landscape to portrait if the parent container width is less than viewport height
  - transwidth sets the width to transition from landscape to portrait for auto and view orientation modes, defaulting 600 pixels if not set
  - maxwidth sets a limit on the maximum width, otherwise the widget will fill the width of the parent container if omitted
  - portratio sets the height-to-width ratio for portrait mode, expressed as a percentage. Defaults to 200% if not set. If set to a truthy value that converts to NaN, then the GUI panels will have a compact automatic height.
  - landratio sets the width-to-height ratio for landscape mode, expressed as a percentage. Defaults to 200% if not set.
  - minpanelswidth sets the smallest width for the GUI panels in landscape mode, where the board and widget height would be shrunk to ensure that this minimum is met, defaulting to 350 pixels if not set
  - minpanelsheight sets the smallest height for the GUI panels in portrait mode (if height is computed using portratio), defaulting to 400 pixels if not set
- fixed requires the width and height of the container div to be set, as they will be accordingly
- none or any other truthy value that is not auto or fixed disables all resizing

Code Doc

Everything is (or at least should be) encapsulated within the name space object besogo

Combining and minifying the JavaScript

./build.sh automatically generates the combined and minified versions (requires shell, cat, curl, and internet access)

Alternatively, you can manually combine and minify as follows

Cobmine the js files into a single file (just ensure that besogo.js is first), e.g., with cat js/* > besogo.all.js
Use the Google Closure Compiler to minify the combined file

JavaScript files in `js/` folder

besogo.js establishes name space, core functions autoInit and create compose the editor and GUI objects
editor.js core editor logic managing game tree, handling input from GUI panels, and notifying GUI panels of state changes
gameRoot.js data structure that internally represents the game tree
boardDisplay.js essential board display GUI panel
controlPanel.js GUI panel for navigation control buttons
namesPanel.js GUI panel for player names, ranks, and captures
commentPanel.js GUI panel for comments and game info
toolPanel.js GUI panel for tool selector buttons
treePanel.js GUI panel for game tree visualization
filePanel.js GUI panel for save, load, and new board buttons
coord.js utility functions for coordinate system labels
svgUtil.js utility functions for SVG composition
parseSgf.js parses and extracts data structure from SGF text
loadSgf.js loads SGF data structure into game tree
saveSgf.js composes SGF file from game tree data structure

CSS files in `css/` folder

besoso.css defines GUI layout and main rendering options
besogo-flat.css default flat board theme
besogo-bold.css bold board theme
besogo-book.css book (black and white) board theme
besogo-dark.css dark (night mode) board theme
besogo-wood.css wood grain board theme
besogo-eidogo.css board theme mimicking EidoGo
besogo-glift.css board theme mimicking Glift
besogo-kibitz.css board theme mimicking GoKibitz
besogo-sensei.css board theme mimicking Sensei's Library

Graphical assets in `img/` folder

These images are used for realistic board and stone rendering

black0.png ... black3.png black stone slate textures
white0.png ... white10.png white stone shell textures
shinkaya1.jpg ... shinkaya4.jpg shinkaya board textures

Change Log

0.0.2-alpha

Redesigned responsive behavior
Added realistic stone and board rendering
Added and modified themes
Added mousewheel navigation
Converted index.html to demo page, moved old index.html to stable.html
Added fixedSize.html examples page
Fixed minor tree panel bug
Tweaked margin for coordinate labels slightly
Added build script for generating combined and minified releases
Reorganized code into folders

0.0.1-alpha

Tweaked widget auto-resize behavior
Refactored for CSS based board themes
Removed board hover effects for touch devices (fixes iOS issues)
History remembered during tree navigation
Favicon added to repository

0.0.0-alpha

Initial preview release

Copying and License

Software Code

The following copyright and license terms only apply to the software code, which consists of all of the files excluding the contents of the img/ directory.

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Graphical Assets

The contents of the img/ directory are copyright by other authors and available under the license terms specified below

The following images are from the go-assets repository, available under a Creative Commons Attribution-ShareAlike 4.0 International license. Copyright (C) 2016 Andreas Tarnowsky andreas.tarnowsky@googlemail.com

4 black stone images img/black0.png ... img/black3.png
11 white stone images img/white0.png ... img/white10.png

The following images are from (or derived from) the jgoboard repository, available under a Creative Commons Attribution-NonCommercial 4.0 International license. Copyright (C) 2013 Joonas Pihlajamaa github@joonaspihlajamaa.com

img/shinkaya1.jpg and its derivatives img/shinkaya2.jpg ... img/shinkaya4.jpg

Keywords

weiqi

baduk

sgf

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Package last updated on 18 Feb 2020

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besogo

BesoGo