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% notcurses-demo(1)
% nick black < nickblack @ linux . com >
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% v2.3.10
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# NAME
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notcurses-demo - Show off some Notcurses features
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# SYNOPSIS
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**notcurses-demo** ** *path***] ** *delaymult***]
[**-l** ** *loglevel***] ** *renderfile***] [**-J** ** *jsonfile***] [**-m** ** *margins***]
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[**-V**|**--version**] [**-kc**] ** *demospec***
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# DESCRIPTION
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**notcurses-demo** demonstrates the capabilities of the Notcurses library. It
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can be run in any terminal emulator or console with a correct terminfo(5)
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database, but is at is best in a 24bpp TrueColor RGB environment. If
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**notcurses-demo** seems to generate garbage, something is likely configured in
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a way that is going to prevent Notcurses from working in other applications.
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The demonstrations include (see NOTES below):
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* (***a***)nimate—explore cycles within Unicode
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* (***b***)oxes—pulsating boxes with a transparent center
* (***c***)hunli—the strongest woman in the world
* (***d***)ragon—the Harter-Heighway dragon curve
* (***e***)agle—they took some time off my life, back in the day
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* (***f***)ission—the screen falls apart under heavy blows
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* (***g***)rid—a gradient of color lain atop a great grid
* (***h***)ighcon—high contrast text atop various colors
* (***i***)ntro—a setting of tone
* (***j***)ungle—low-bandwidth color cycling reveals ancient ruins
* (***k***)eller—the miracle of sight, and painting with Braille
* (***l***)uigi—a dashing Apennine plumber in a world of fire
* (***m***)ojibake—today's fresh catch of emoji (market price)
* (***n***)ormal—a normal map of a friend, with effects
* (***o***)utro—a message of hope from the library's author
* (***q***)rcode—quick response codes (from ISO/IEC 18004:2015)
* (***r***)eel—demonstration of the ncreel high-level widget
* (***s***)liders—a missing-piece puzzle made up of colorful blocks
* (***t***)rans—an exploration of various transparencies
* (***u***)niblocks—a series of blocks detailing Unicode pages
* (***v***)iew—images and a video are rendered as text
* (***w***)hiteout—a great Nothing slowly robs the world of color
* (***x***)ray—stimulate a logo with energy
* (***y***)ield—the best laid schemes o' mice an'men gang aft agley
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* (***z***)oo—see the marvelous widgets of the Notcurses world
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At any time, press 'q' to quit. The demo is best run in at least an 80x45
terminal, and will refuse to run in anything smaller than 80x24.
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# OPTIONS
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**-p** ** *path***: Look in the specified ** *path*** for data files.
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**-d** ** *delaymult***: Apply a non-negative rational multiplier to the standard delay of 1s.
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**-l** ** *loglevel***: Log between everything (loglevel 8) and nothing (loglevel 0) to stderr.
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**-f** ** *renderfile***: Render each frame to ** *renderfile*** in addition to the screen.
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**-J** ** *jsonfile***: Emit JSON summary of run to ** *jsonfile***.
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**-m** ** *margins***: Define rendering margins (see below).
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**-k**: Inhibit use of the alternate screen. Necessary if you want the output left on your terminal after the program exits.
**-c**: Do not attempt to seed the PRNG. This is useful when benchmarking.
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**-h**|**--help**: Print a usage message, and exit with success.
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**-V**|**--version**: Print the program name and version, and exit with success.
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***demospec***: Select which demos to run, and what order to run them in. The
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default is **ixetnchdmbkygarwuvlsfjqzo** . See above for a list of demos.
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Default margins are all 0, and thus the full screen will be rendered. Using
**-m**, margins can be supplied. Provide a single number to set all four margins
to the same value, or four comma-delimited values for the top, right, bottom,
and left margins respectively. Negative margins are illegal.
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# NOTES
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Proper display requires:
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* A terminal advertising the **rgb** terminfo(5) capability, or that the environment variable **COLORTERM** is defined to **24bit** (and that the terminal honors RGB escapes),
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* A monospaced font, and
* Good Unicode support in your libc, font, and terminal emulator.
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The Debian version of **notcurses-demo** leaves out certain multimedia
considered non-free under the Debian Free Software Guidelines. As a result, the
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**chunli**, **eagle** , **jungle** , **keller** , **luigi** , and **view** demos
are unavailable through the Debian package. This applies to any distro which
uses the DFSG source tarball, including Ubuntu and Fedora.
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If Notcurses is built without multimedia support, the **chunli** , **eagle** ,
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**keller**, **outro** , **view** , **xray** , and **yield** demos will be
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partially or wholly unavailable. If Notcurses is built without libqrcodegen,
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the **qrcode** demo will be unavailable.
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If **notcurses-demo** is run in a terminal lacking the **can_change** terminfo
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capability, the **jungle** demo will be skipped.
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The following keypresses are recognized (and are also available from the menu):
* **Ctrl-U**: Toggle the help screen.
* **H**: Toggle the HUD. The HUD shows the most recent and current demos'
runtime and number of rendered frames. It can be grabbed and moved
with the mouse.
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* **P**: Toggle the FPS graph.
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* **Ctrl-R**: Restart the demo.
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* **Alt-d**: Toggle a window with debugging information.
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* **q**: Quit.
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Benchmarking should be performed using ** -c** to get a well-defined PRNG seed.
JSON output via ** -J** will probably be useful.
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# BUGS
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Certain demos (especially **mojibake** and **uniblocks** ) heavily exercise the
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font rendering stack. If your font or rendering engine draws glyphs with width
different from that reported by the standard library's **wcwidth(3)** ,
Notcurses will have an incorrect notion of cursor placement, leading to
undesirable behavior.
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# COPYRIGHT
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* All code and design copyright Nick Black < nickblack @ linux . com > .
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* Images from Street Fighter II and Mega Man 2 copyright Capcom of America.
* Images from Super Mario Bros. copyright Nintendo of America.
* Images from Ninja Gaiden copyright Koei Tecmo America.
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* Images from Final Fantasy copyright Square Enix Co Ltd.
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* Images from Back to the Future copyright Universal Studios and U-Drive Joint Venture.
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* "Jungle with Rain" copyright Mark Ferrari/Living Worlds.
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# SEE ALSO
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**notcurses(3)**,
**ncurses(3NCURSES)**,
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**wcwidth(3)**,
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**terminfo(5)**
