PENGUINLIONG / pyxel

A retro game engine for Python

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Pyxel is a retro game engine for Python.

Thanks to its simple specifications inspired by retro gaming consoles, such as only 16 colors can be displayed and only 4 sounds can be played back at the same time, you can feel free to enjoy making pixel art style games.

The specifications of Pyxel are referring to awesome PICO-8 and TIC-80.

Pyxel is open source and free to use. Let's start making a retro game with Pyxel!

Specifications

  • Run on Windows, Mac, and Linux
  • Programming with Python
  • 16 color palette
  • 256x256 sized 3 image banks
  • 256x256 sized 8 tilemaps
  • 4 channels with 64 definable sounds
  • 8 musics which can combine arbitrary sounds
  • Keyboard, mouse, and gamepad inputs
  • Image and sound editor

Color Palette

How to Install

There are two types of Pyxel, a packaged version and a standalone version.

Install Packaged Version

The packaged version of Pyxel uses Pyxel as a Python extension module.

Recommended for those who are familiar with managing Python packages using the pip command or who want to develop full-fledged Python applications.

Windows

After installing Python3 (version 3.7 or higher), run the following command:

pip install -U pyxel

Mac

After installing Python3 (version 3.7 or higher), run the following command:

pip3 install -U pyxel

Linux

After installing the SDL2 package (libsdl2-dev for Ubuntu), Python3 (version 3.7 or higher), and python3-pip, run the following command:

sudo pip3 install -U pyxel

If the above doesn't work, try self-building by following the steps below after installing cmake and rust:

git clone https://github.com/kitao/pyxel.git
cd pyxel
make clean all
sudo pip3 install .

Install Standalone Version

The standalone version of Pyxel uses Pyxel as a standalone tool that does not depend on Python.

Recommended for those who want to start programming easily without worrying about Python settings, or those who want to play Pyxel games immediately.

Windows

Download and run the latest version of the Windows installer (pyxel-[version]-windows-setup.exe) from the Download Page.

Mac

After installing Homebrew, run the following commands:

brew tap kitao/pyxel
brew install pyxel

Linux

After installing the SDL2 package (libsdl2-dev for Ubuntu) and installing Homebrew, run the following commands:

brew tap kitao/pyxel
brew install pyxel

If the above doesn't work, try self-building the packaged version.

Try Pyxel Examples

After installing Pyxel, the examples of Pyxel will be copied to the current directory with the following command:

pyxel copy_examples

The examples to be copied are as follows:

An examples can be executed with the following commands:

cd pyxel_examples
pyxel run 01_hello_pyxel.py

How to Use

Create Pyxel Application

After importing the Pyxel module in your python script, specify the window size with init function first, then starts the Pyxel application with run function.

import pyxel

pyxel.init(160, 120)

def update():
    if pyxel.btnp(pyxel.KEY_Q):
        pyxel.quit()

def draw():
    pyxel.cls(0)
    pyxel.rect(10, 10, 20, 20, 11)

pyxel.run(update, draw)

The arguments of run function are update function to update each frame and draw function to draw screen when necessary.

In an actual application, it is recommended to wrap pyxel code in a class as below:

import pyxel

class App:
    def __init__(self):
        pyxel.init(160, 120)
        self.x = 0
        pyxel.run(self.update, self.draw)

    def update(self):
        self.x = (self.x + 1) % pyxel.width

    def draw(self):
        pyxel.cls(0)
        pyxel.rect(self.x, 0, 8, 8, 9)

App()

It is also possible to write simple code using show function and flip function to draw simple graphics and animations.

show function displays the screen and waits until the Esc key is pressed.

import pyxel

pyxel.init(120, 120)
pyxel.cls(1)
pyxel.circb(60, 60, 40, 7)
pyxel.show()

flip function updates the screen once.

import pyxel

pyxel.init(120, 80)

while True:
    pyxel.cls(3)
    pyxel.rectb(pyxel.frame_count % 160 - 40, 20, 40, 40, 7)
    pyxel.flip()

Run Pyxel Application

The created Python script can be executed with the following command:

pyxel run PYTHON_SCRIPT_FILE

For the packaged version, it can be executed like a normal Python script:

cd pyxel_examples
python3 PYTHON_SCRIPT_FILE

(For Windows, type python instead of python3)

Special Controls

The following special controls can be performed while a Pyxel application is running:

  • Esc
    Quit the application
  • Alt(Option)+1
    Save the screenshot to the desktop
  • Alt(Option)+2
    Reset the recording start time of the screen capture video
  • Alt(Option)+3
    Save the screen capture video to the desktop (up to 10 seconds)
  • Alt(Option)+0
    Toggle the performance monitor (fps, update time, and draw time)
  • Alt(Option)+Enter
    Toggle full screen

How to Create Resource

Pyxel Editor can create images and sounds used in a Pyxel application.

It starts with the following command:

pyxel edit [PYXEL_RESOURCE_FILE]

If the specified Pyxel resource file (.pyxres) exists, the file is loaded, and if it does not exist, a new file is created with the specified name. If the resource file is omitted, the name is my_resource.pyxres.

After starting Pyxel Editor, the file can be switched by dragging and dropping another resource file. If the resource file is dragged and dropped while holding down Ctrl(Cmd) key, only the resource type (Image/Tilemap/Sound/Music) that is currently being edited will be loaded. This operation enables to combine multiple resource files into one.

The created resource file can be loaded with load function.

Pyxel Editor has the following edit modes.

Image Editor:

The mode to edit the image banks.

By dragging and dropping an image file (png/gif/jpeg) onto the Image Editor screen, the image can be loaded into the currently selected image bank.

Tilemap Editor:

The mode to edit tilemaps in which images of the image banks are arranged in a tile pattern.

Sound Editor:

The mode to edit sounds.

Music Editor:

The mode to edit musics in which the sounds are arranged in order of playback.

Other Resource Creation Methods

Pyxel images and tilemaps can also be created by the following methods:

  • Create an image from a list of strings with Image.set function or Tilemap.set function
  • Load an image file (png/gif/jpeg) in Pyxel palette with Image.load function

Pyxel sounds can also be created in the following method:

  • Create a sound from strings with Sound.set function or Music.set function

Please refer to the API reference for usage of these functions.

How to Distribute Application

Pyxel supports a dedicated application distribution file format (Pyxel application file) that works across platforms.

Create the Pyxel application file (.pyxapp) with the following command:

pyxel package APP_ROOT_DIR STARTUP_SCRIPT_FILE

If the application should include resources or additional modules, place them in the application folder.

The created application file can be executed with the following command:

pyxel play PYXEL_APP_FILE

API Reference

System

  • width, height
    The width and height of the screen

  • frame_count
    The number of the elapsed frames

  • init(width, height, [title], [fps], [quit_key], [capture_scale], [capture_sec])
    Initialize the Pyxel application with screen size (width, height). The following can be specified as options: the window title with title, the frame rate with fps, the key to quit the application with quit_key, the scale of the screen capture with capture_scale, and the maximum recording time of the screen capture video with capture_sec.
    e.g. pyxel.init(160, 120, title="My Pyxel App", fps=60, quit_key=pyxel.KEY_NONE, capture_scale=3, capture_sec=0)

  • run(update, draw)
    Start the Pyxel application and call update function for frame update and draw function for drawing.

  • show()
    Show the screen and wait until the Esc key is pressed. (Do not use in normal applications)

  • flip()
    Updates the screen once. (Do not use in normal applications)

  • quit()
    Quit the Pyxel application.

Resource

  • load(filename, [image], [tilemap], [sound], [music])
    Load the resource file (.pyxres). If False is specified for the resource type (image/tilemap/sound/music), the resource will not be loaded.

Input

  • mouse_x, mouse_y
    The current position of the mouse cursor

  • mouse_wheel
    The current value of the mouse wheel

  • btn(key)
    Return True if key is pressed, otherwise return False. (Key definition list)

  • btnp(key, [hold], [period])
    Return True if key is pressed at that frame, otherwise return False. When hold and period are specified, True will be returned at the period frame interval when the key is held down for more than hold frames.

  • btnr(key)
    Return True if key is released at that frame, otherwise return False.

  • mouse(visible)
    If visible is True, show the mouse cursor. If False, hide it. Even if the mouse cursor is not displayed, its position is updated.

Graphics

  • colors
    List of the palette display colors. The display color is specified by a 24-bit numerical value. Use colors.from_list and colors.to_list to directly assign and retrieve Python lists.
    e.g. org_colors = pyxel.colors.to_list(); pyxel.colors[15] = 0x112233; pyxel.colors.from_list(org_colors)

  • image(img)
    Operate the image bank img (0-2). (See the Image class)
    e.g. pyxel.image(0).load(0, 0, "title.png")

  • tilemap(tm)
    Operate the tilemap tm (0-7). (See the Tilemap class)

  • clip(x, y, w, h)
    Set the drawing area of the screen from (x, y) to width w and height h. Reset the drawing area to full screen with clip().

  • camera(x, y)
    Change the upper left corner coordinates of the screen to (x, y). Reset the upper left corner coordinates to (0, 0) with camera().

  • pal(col1, col2)
    Replace color col1 with col2 at drawing. pal() to reset to the initial palette.

  • cls(col)
    Clear screen with color col.

  • pget(x, y)
    Get the color of the pixel at (x, y).

  • pset(x, y, col)
    Draw a pixel of color col at (x, y).

  • line(x1, y1, x2, y2, col)
    Draw a line of color col from (x1, y1) to (x2, y2).

  • rect(x, y, w, h, col)
    Draw a rectangle of width w, height h and color col from (x, y).

  • rectb(x, y, w, h, col)
    Draw the outline of a rectangle of width w, height h and color col from (x, y).

  • circ(x, y, r, col)
    Draw a circle of radius r and color col at (x, y).

  • circb(x, y, r, col)
    Draw the outline of a circle of radius r and color col at (x, y).

  • tri(x1, y1, x2, y2, x3, y3, col)
    Draw a triangle with vertices (x1, y1), (x2, y2), (x3, y3) and color col.

  • trib(x1, y1, x2, y2, x3, y3, col)
    Draw the outline of a triangle with vertices (x1, y1), (x2, y2), (x3, y3) and color col.

  • blt(x, y, img, u, v, w, h, [colkey])
    Copy the region of size (w, h) from (u, v) of the image bank img (0-2) to (x, y). If negative value is set for w and/or h, it will reverse horizontally and/or vertically. If colkey is specified, treated as transparent color.

  • bltm(x, y, tm, u, v, w, h, [colkey])
    Copy the region of size (w, h) from (u, v) of the tilemap tm (0-7) to (x, y). If negative value is set for w and/or h, it will reverse horizontally and/or vertically. If colkey is specified, treated as transparent color. The size of a tile is 8x8 pixels and is stored in a tilemap as a tuple of (x in tile, y in tile).

  • text(x, y, s, col)
    Draw a string s of color col at (x, y).

Audio

  • sound(snd)
    Operate the sound snd (0-63). (See the Sound class)
    e.g. pyxel.sound(0).speed = 60

  • music(msc)
    Operate the music msc (0-7). (See the Music class)

  • play_pos(ch)
    Get the sound playback position of channel ch (0-3) as a tuple of (sound no, note no). Returns None when playback is stopped.

  • play(ch, snd, loop=False)
    Play the sound snd (0-63) on channel ch (0-3). If snd is a list, it will be played in order. If True is specified for loop, loop playback is performed.

  • playm(msc, loop=False)
    Play the music msc (0-7). If True is specified for loop, loop playback is performed.

  • stop([ch])
    Stops playback of the specified channel ch (0-3). stop() to stop playing all channels.

Image Class

  • width, height
    The width and height of the image

  • set(x, y, data)
    Set the image at (x, y) by a list of strings.
    e.g. pyxel.image(0).set(10, 10, ["0123", "4567", "89ab", "cdef"])

  • load(x, y, filename)
    Load the image file (png/gif/jpeg) at (x, y).

  • pget(x, y)
    Get the pixel color at (x, y).

  • pset(x, y, col)
    Draw a pixel of color col at (x, y).

Tilemap Class

  • width, height
    The width and height of the tilemap

  • refimg
    The image bank (0-2) referenced by the tilemap

  • set(x, y, data)
    Set the tilemap at (x, y) by a list of strings.
    e.g. pyxel.tilemap(0).set(0, 0, ["000102", "202122", "a0a1a2", "b0b1b2"])

  • pget(x, y)
    Get the tile at (x, y). A tile is a tuple of (x in tile, y in tile).

  • pset(x, y, tile)
    Draw a tile at (x, y). A tile is a tuple of (x in tile, y in tile).

Sound Class

  • notes
    List of notes (0-127). The higher the number, the higher the pitch, and at 33 it becomes 'A2'(440Hz). The rest is -1.

  • tones
    List of tones (0:Triangle / 1:Square / 2:Pulse / 3:Noise)

  • volumes
    List of volumes (0-7)

  • effects
    List of effects (0:None / 1:Slide / 2:Vibrato / 3:FadeOut)

  • speed
    Playback speed. 1 is the fastest, and the larger the number, the slower the playback speed. At 120, the length of one note becomes 1 second.

  • set(notes, tones, volumes, effects, speed)
    Set notes, tones, volumes, and effects with a string. If the tones, volumes, and effects length are shorter than the notes, it is repeated from the beginning.

  • set_notes(notes)
    Set the notes with a string made of 'CDEFGAB'+'#-'+'0123' or 'R'. Case-insensitive and whitespace is ignored.
    e.g. pyxel.sound(0).set_note("G2B-2D3R RF3F3F3")

  • set_tones(tones)
    Set the tones with a string made of 'TSPN'. Case-insensitive and whitespace is ignored.
    e.g. pyxel.sound(0).set_tone("TTSS PPPN")

  • set_volumes(volumes)
    Set the volumes with a string made of '01234567'. Case-insensitive and whitespace is ignored.
    e.g. pyxel.sound(0).set_volume("7777 7531")

  • set_effects(effects)
    Set the effects with a string made of 'NSVF'. Case-insensitive and whitespace is ignored.
    e.g. pyxel.sound(0).set_effect("NFNF NVVS")

Music Class

  • sequences
    Two-dimensional list of sounds (0-63) listed by the number of channels

  • set(seq0, seq1, seq2, seq3)
    Set the lists of sound (0-63) of all channels. If an empty list is specified, that channel is not used for playback.
    e.g. pyxel.music(0).set([0, 1], [2, 3], [4], [])

Advanced APIs

Pyxel has "advanced APIs" that are not mentioned in this reference because they "may confuse users" or "need specialized knowledge to use".

If you are familiar with your skills, try to create amazing works with this as a clue!

How to Contribute

Submitting Issue

Use the Issue Tracker to submit bug reports and feature/enhancement requests. Before submitting a new issue, ensure that there is no similar open issue.

Manual Testing

Anyone manually testing the code and reporting bugs or suggestions for enhancements in the Issue Tracker are very welcome!

Submitting Pull Request

Patches/fixes are accepted in form of pull requests (PRs). Make sure the issue the pull request addresses is open in the Issue Tracker.

Submitted pull request is deemed to have agreed to publish under MIT License.

Other Information

License

Pyxel is under MIT License. It can be reused within proprietary software, provided that all copies of the software or its substantial portions include a copy of the terms of the MIT License and also a copyright notice.

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A retro game engine for Python

License:MIT License


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