Download the release version here:
neg-world-engine.zip

Or download the newest version from the Git repository:
https://gitlab.tubit.tu-berlin.de/srather/NEG-World-Engine.git

Root: README, main

• Datatypes: Vector, Matrix

• Drawables: drawable, Ray, Polygon, Floor, Portal

• Utility: colors, generate, draw

colors.py

WHITE           = (0xff, 0xff, 0xff)
LIGHT_GRAY      = (0xc0, 0xc0, 0xc0)
GRAY            = (0x80, 0x80, 0x80)
DARK_GRAY       = (0x40, 0x40, 0x40)
BLACK           = (0x00, 0x00, 0x00)
 
LIGHT_RED       = (0xff, 0x40, 0x40)
LIGHT_ORANGE    = (0xff, 0xa0, 0x40)
LIGHT_YELLOW    = (0xff, 0xff, 0x40)
LIGHT_GREEN     = (0x40, 0xff, 0x40)
LIGHT_CYAN      = (0x40, 0xff, 0xff)
LIGHT_BLUE      = (0x40, 0x40, 0xff)
LIGHT_PURPLE    = (0xa0, 0x40, 0xff)
LIGHT_MAGENTA   = (0xff, 0x40, 0xff)
 
BRIGHT_RED      = (0xff, 0x00, 0x00)
BRIGHT_ORANGE   = (0xff, 0x80, 0x00)
BRIGHT_YELLOW   = (0xff, 0xff, 0x00)
BRIGHT_GREEN    = (0x00, 0xff, 0x00)
BRIGHT_CYAN     = (0x00, 0xff, 0xff)
BRIGHT_BLUE     = (0x00, 0x00, 0xff)
BRIGHT_PURPLE   = (0x80, 0x00, 0xff)
BRIGHT_MAGENTA  = (0xff, 0x00, 0xff)
 
RED             = (0xc0, 0x00, 0x00)
ORANGE          = (0xc0, 0x60, 0x00)
YELLOW          = (0xc0, 0xc0, 0x00)
GREEN           = (0x00, 0xc0, 0x00)
CYAN            = (0x00, 0xc0, 0xc0)
BLUE            = (0x00, 0x00, 0xc0)
PURPLE          = (0x60, 0x00, 0xc0)
MAGENTA         = (0xc0, 0x00, 0xc0)
 
DARK_RED        = (0x80, 0x00, 0x00)
DARK_ORANGE     = (0x80, 0x40, 0x00)
DARK_YELLOW     = (0x80, 0x80, 0x00)
DARK_GREEN      = (0x00, 0x80, 0x00)
DARK_CYAN       = (0x00, 0x80, 0x80)
DARK_BLUE       = (0x00, 0x00, 0x80)
DARK_PURPLE     = (0x40, 0x00, 0x80)
DARK_MAGENTA    = (0x80, 0x00, 0x80)

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generate.py

import math
from polygon import *
from matrix import *
 
 
def polygon(edges, center, radius, phase=0, M=((1,0),(0,1)), color=(0,0,0)):
    """
    Return a regular polygon.
 
    edges (int) -- number of sides
    center (Vector) -- position of center
    radius (float) -- radius to vertex
    phase (float) -- rotates polygon 'phase' vertics
    M (Matrix) -- distortion matrix
    """
 
    poly = Polygon(color=color)
    for n in range(edges):
        x = radius * math.sin((n + phase) * math.tau / edges)
        y = radius * math.cos((n + phase) * math.tau / edges)
        poly.append(Vector(*center) + Matrix(*M).prod(Vector(x, y)))
 
    return poly
 
 
def star(edges, center, radius, ratio=0.5, phase=0, M=Matrix((1,0),(0,1)), color=(0,0,0)):
    """
    Return a regular star polygon.
 
    edges (int) -- number of convex vertices
    center (Vector) -- position of center
    radius (float) -- radius to vertex
    ratio (float) -- radius ratio to inner vertices
    phase (float) -- rotates polygon 'phase' vertics
    M (Matrix) -- distortion matrix
    """
 
    poly = Polygon(color=color)
    for n in range(edges):
        x = radius * math.sin((n + phase) * math.tau / edges)
        y = radius * math.cos((n + phase) * math.tau / edges)
        poly.append(Vector(*center) + M.prod(Vector(x, y)))
 
        x = ratio * radius * math.sin((n + 0.5 + phase) * math.tau / edges)
        y = ratio * radius * math.cos((n + 0.5 + phase) * math.tau / edges)
        poly.append(Vector(*center) + M.prod(Vector(x, y)))
 
    return poly
 
 
def border(polygon):
    """
    Turn a polygon into a border.
    (split it into its sides)
    """
 
    bor = []
    for i, _ in enumerate(polygon):
        bor.append(Polygon(polygon[i-1], polygon[i]))
    return bor
 
 
def door(start, end, part):
    """
    Turn a wall into a door.
    (make a hole in the middle with relative size 'part')
    """
 
    return (Polygon(start, start+(1-part)/2*(end-start)), Polygon(end+(1-part)/2*(start-end), end))

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draw.py

import pygame.gfxdraw
import colors
from drawable import *
from portal import *
 
 
def player(screen, offset, size):
    """
    Draw the player as a white circle in the middle of the screen.
    """
 
    rect = Vector(*screen.get_rect()[2:])
    pygame.gfxdraw.aacircle(screen, *round(rect / 2), size // 2, colors.WHITE)
    pygame.gfxdraw.filled_circle(screen, *round(rect / 2), size // 2, colors.WHITE)
 
 
def world(screen, wrld, offset, depth):
    """
    Draw all objects in 'wrld' in the right order with their shadows
    and portal worlds to the maximum recursion-'depth'.
    """
 
    # put all objects in a tuple with their distance to be sortable
    dists = []
    for object in wrld:
        dists.append((object.dist_to(offset), object))
 
    # draw the furtheset object first
    for object in reversed(sorted(dists)):
        if isinstance(object[1], drawable):
            # draw order: shadow, portal world, object
            object[1].draw_shadow(screen, offset, offset)
            if depth > 0 and type(object[1]) is Portal:
                world(screen, object[1].portal_world(wrld, offset), offset, depth - 1)
            object[1].draw(screen, offset)
        else:
            raise TypeError(f"draw_world() expected drawable objects, but '{object.__class__.__name__}' found")
 
 
def debug(screen, y, info, color):
    """
    Draw debug information 'info' to the top right corner.
    'y' is the textline and 'color' the color.
    """
 
    # binary representation of some chars
    chars = {
        '': [0b10101010, 0b01010101, 0b10101010, 0b01010101, 0b10101010, 0b01010101],
        '0': [0b00111110, 0b01000101, 0b01001001, 0b01010001, 0b00111110, 0b00000000],
        '1': [0b01000000, 0b01000000, 0b01111111, 0b01000010, 0b01000000, 0b00000000],
        '2': [0b01000110, 0b01001001, 0b01001001, 0b01010001, 0b01100010, 0b00000000],
        '3': [0b00110110, 0b01001001, 0b01001001, 0b01000001, 0b00100010, 0b00000000],
        '4': [0b01111111, 0b00010001, 0b00010010, 0b00010100, 0b00011000, 0b00000000],
        '5': [0b00111001, 0b01000101, 0b01000101, 0b01000101, 0b00100111, 0b00000000],
        '6': [0b00110000, 0b01001001, 0b01001001, 0b01001010, 0b00111100, 0b00000000],
        '7': [0b00000111, 0b00001001, 0b01110001, 0b00000001, 0b00000011, 0b00000000],
        '8': [0b00110110, 0b01001001, 0b01001001, 0b01001001, 0b00110110, 0b00000000],
        '9': [0b00011110, 0b00101001, 0b01001001, 0b01001001, 0b00000110, 0b00000000],
        '.': [0b01100000, 0b00000000],
        ',': [0b11100000, 0b00000000],
        '+': [0b00001000, 0b00001000, 0b00111110, 0b00001000, 0b00001000, 0b00000000],
        '-': [0b00001000, 0b00001000, 0b00001000, 0b00001000, 0b00001000, 0b00000000],
        ' ': [0b00000000, 0b00000000, 0b00000000],
        'F': [0b00000001, 0b00001001, 0b00001001, 0b00001001, 0b01111111, 0b00000000],
        'P': [0b00000110, 0b00001001, 0b00001001, 0b00001001, 0b01111111, 0b00000000],
        'S': [0b00110001, 0b01001001, 0b01001001, 0b01001001, 0b01000110, 0b00000000],
        'X': [0b01100011, 0b00010100, 0b00001000, 0b00010100, 0b01100011, 0b00000000],
        'Y': [0b00000011, 0b00000100, 0b01111000, 0b00000100, 0b00000011, 0b00000000],
    }
 
    pos = screen.get_rect()[2] - 4
    for char in reversed(str(info)):
        for line in chars.get(char, chars.get(char.upper(), chars[''])):
            for i in range(8):
                if line >> i & 0b1:
                    pygame.gfxdraw.pixel(screen, pos, i+3 + 10*y, color)
            pos -= 1

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