pysfml-net 1.1.3

Python wrapper for SFML via C# (SFML.NET) and pythonnet

pysfml-net

A Python wrapper around SFML via C# (SFML.NET) and pythonnet.
Write 2D games in Python — with the performance of native C++.

Python → pysfml → pysfmllib.dll (C# / SFML.NET) → csfml → SFML (C++)

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Requirements

Dependency	Version
Python	3.10+
pythonnet	3.x
.NET	6+ (coreclr)
SFML	2.6.x / 3.x
SFML.NET	matching SFML version

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Installation

pip install pysfml-net

pysfml-net installs only the Python wrapper.
You must place the following DLLs in the same folder as your script:

csfml-system.dll
csfml-window.dll
csfml-graphics.dll
csfml-audio.dll
sfml-system-3.dll     (or sfml-system-2.dll depending on your SFML version)
sfml-window-3.dll
sfml-graphics-3.dll
sfml-audio-3.dll

Download SFML from sfml-dev.org — make sure the bitness matches your Python (x64).

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Quick Start

from pysfml import Window, Sprite, Label, Sound

win = Window(800, 600, "My Game")

player = Sprite(48, 48)
player.set_fill_color(100, 180, 255)
player.set_position(100, 270)

label = Label("roboto.ttf", 24)
label.set_text("Score: 0")
label.set_position(16, 12)

while win.is_open():
    win.dispatch_events()
    dt = win.get_delta_time()

    if win.is_key_pressed("Escape"):
        win.close()

    win.clear()
    player.draw(win)
    label.draw(win)
    win.display()

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API

Window

win = Window(width: int, height: int, title: str)

Method	Returns	Description
is_open()	bool	False after window is closed
dispatch_events()	—	Process OS events — call every frame
get_delta_time()	float	Seconds since last frame
clear()	—	Clear screen
display()	—	Present frame
close()	—	Close the window
draw(sprite)	—	Draw a Sprite
is_key_pressed(key)	bool	Check keyboard key by name
is_button_pressed(btn)	bool	Check mouse button by name
get_mouse_position()	Vector2i	Current mouse position

Key names: "Left", "Right", "Up", "Down", "Space", "Escape", "A"–"Z", "Num0"–"Num9" — full list at SFML Keyboard.Key

Mouse button names: "Left", "Right", "Middle"

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Sprite

sp = Sprite(width: float, height: float)

Method	Description
set_position(x, y)	Set position
set_size(w, h)	Resize the sprite
set_fill_color(r, g, b, a=255)	Set fill color (0–255 each)
load_texture(path)	Load texture from file — path is resolved to absolute automatically
set_texture_sprite(x, y, w, h)	Select a frame from a spritesheet
draw(win)	Draw to window

Note: after load_texture() set FillColor to white in your C# Sprite class,
otherwise the texture will be tinted by the fill color.

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Label

lbl = Label(font_path: str, size: int)

Method	Description
set_text(value)	Set displayed text (auto-converts to str)
set_position(x, y)	Set position
draw(win)	Draw to window

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Sound

snd = Sound(path: str)

Method	Description
play()	Play the sound
stop()	Stop playback
pause()	Pause playback
set_volume(v)	Volume from 0.0 to 100.0

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Movement with delta time

player = Sprite(48, 48)
player.set_fill_color(255, 100, 100)
player.set_position(400, 300)

vx, vy = 0.0, 0.0
x,  y  = 400.0, 300.0
SPEED  = 250.0

while win.is_open():
    win.dispatch_events()
    dt = win.get_delta_time()

    if win.is_key_pressed("Escape"): win.close()

    vx = 0.0
    vy = 0.0
    if win.is_key_pressed("Left"):  vx = -SPEED
    if win.is_key_pressed("Right"): vx =  SPEED
    if win.is_key_pressed("Up"):    vy = -SPEED
    if win.is_key_pressed("Down"):  vy =  SPEED

    x += vx * dt
    y += vy * dt
    player.set_position(x, y)

    win.clear()
    player.draw(win)
    win.display()

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Project layout

your_game/
├── main.py
├── pysfmllib.dll         ← C# bridge
├── SFML.*.dll            ← managed SFML.NET
├── csfml-*.dll           ← native C bindings
├── sfml-*-3.dll          ← native SFML
└── assets/
    ├── textures/
    ├── fonts/
    └── sounds/

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Troubleshooting

Failed to load SFML assemblies
All DLLs must be in the same folder as your script. Run your script from that folder:

cd your_game
python main.py

Failed to activate OpenGL context
Install Visual C++ Redistributable x64.

Texture loads but sprite stays white
Set FillColor = Color.White inside LoadTexture() in your C# Sprite class.

Wrong bitness error
Check your Python bitness:

import struct; print(struct.calcsize("P") * 8)  # 32 or 64

All DLLs must match (all x64 or all x32).

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License

MIT — © 2025 Neyzi