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[[nichteuklidische_geometrie|← Back to project page]]

====== Sourcecode ======

Download the release version here:\\
{{:ss20:neg-world-engine.zip}}

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

==== Folder Structure: ====


**[[neg_sourcecode|Root]]:** [[neg_sourcecode#readme|README]], [[neg_sourcecode#main|main]]

  * **[[neg_datatypes|Datatypes]]:** [[neg_datatypes#vector|Vector]], [[neg_datatypes#matrix|Matrix]]

  * **[[neg_drawables|Drawables]]:** [[neg_drawables#drawable|drawable]], [[neg_drawables#ray|Ray]], [[neg_drawables#polygon|Polygon]], [[neg_drawables#floor|Floor]], [[neg_drawables#portal|Portal]]

  * **[[neg_utility|Utility]]:** [[neg_utility#colors|colors]], [[neg_utility#generate|generate]], [[neg_utility#draw|draw]]

===== Objects =====

----


==== drawable ====
<file python drawable.py>
import colors
from vector import *


class drawable(list):
    """
    Abstract superclass for all objects drawable on canvas.
    A drawable is a list of points ('Vector') with a 'color' attribute.
    """


    def __init__(self, *points, color=colors.BLACK):
        """
        Overrides '__init__' method of 'list' class.
        Will only accept point-like objects and adds 'color' attribute.
        """

        list.__init__(self)
        for point in points:
            drawable.append(self, point)
        self.color = color


    def append(self, item):
        """
        Overrides 'append' method of 'list' class.
        Will only accept point-like objects.
        """

        try:
            list.append(self, Vector(*item))
        except:
            raise TypeError(f"Expected vector/point, but got {item.__class__.__name__}")


    def __str__(self):
        """
        Override '__str__' method of 'list' class.
        Return string with classname, points in 'self' and additional attributes.
        """

        return f"{self.__class__.__name__}({list.__repr__(self)[1:-1]}) with {self.__dict__.__repr__()[1:-1].replace(':', ' =').replace(' ', '')}"


    def __repr__(self):
        """
        Override '__repr__' method of 'list' class.
        Return string with classname, points in 'self' and additional attributes.
        """

        return f"{self.__class__.__name__}({list.__repr__(self)[1:-1]}, {self.__dict__.__repr__()[1:-1].replace(':', ' =').replace(' ', '')})"


    def draw(self, screen, offset):
        """Abstract method to draw 'self' on 'screen'."""
        raise NotImplementedError


    def draw_shadow(self, screen, offset, source, color=(31,31,31)):
        """Abstract method to draw a shadow of 'self' on 'screen'."""
        raise NotImplementedError


    def dist_to(self, source):
        """Abstract method to calculate the distance to the player ('source')."""
        raise NotImplementedError


    def cut(self, source, portal):
        """Abstract method to cut 'self' to fit in the portal view."""
        raise NotImplementedError

</file>

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----


==== Ray ====
<file python ray.py>
import pygame.gfxdraw
import colors
from drawable import *
from matrix import *


class Ray(drawable):
    """
    Ray class as drawable object for visual debug.
    A Ray has a starting point and a direction vector.
    """


    def __init__(self, start, dir, color=colors.BRIGHT_RED):
        """Initilise 'self' with standard color 'BRIGHT_RED'."""
        drawable.__init__(self, start, dir, color=color)


    def __getattr__(self, attr):
        """
        Return 'self[0]' and 'self[1]' as attribute 'start' and 'dir'.
        """

        if attr == 'start':
            return self[0]
        if attr == 'dir':
            return self[1]


    def point_at(self, value):
        """
        Return the point 'self.start + value * self.dir'.
        """

        if type(value) in (int, float):
            return self.start + value * self.dir

        raise TypeError(f"Expected int or float, but {value.__class__.__name__} found")


    def value_at(self, point):
        """
        Return the value with 'point_at(value) == point'.
        """

        if type(point) is Vector:
            if self.dir.multiple_of(point - self.start):
                value = (point - self.start) / self.dir
                if value is not None:
                    return value

            # hotfix
            h = (point - self.start).dot(self.dir) / self.dir.dot(self.dir)
            print(f"Warning: returned nearest value for 'value_at' of point {((point - self.start) - h * self.dir).length()} off the ray)")
            return h

        raise TypeError(f"Expected Vector, but {point.__class__.__name__} found")


    def offscreen(self, screen, offset):
        """
        Return a point of the ray that is not on the rect 'screen'.
        This assumes all rays go away from the 'screen' center.
        """

        if not self.dir: # == 0
            return self.start

        x, y = float('inf'), float('inf')

        if self.dir.x > 0:
            x = (offset.x + screen.get_rect()[2] / 2 - self.start.x) / self.dir.x
        elif self.dir.x < 0:
            x = (offset.x - screen.get_rect()[2] / 2 - self.start.x) / self.dir.x

        if self.dir.y > 0:
            y = (offset.y + screen.get_rect()[3] / 2 - self.start.y) / self.dir.y
        elif self.dir.y < 0:
            y = (offset.y - screen.get_rect()[3] / 2 - self.start.y) / self.dir.y

        return self.point_at(max(0, min(x, y)))


    def intersect(self, other):
        """
        Return list of intersections sorted by distance to 'self.start'.
        """

        if self.dir.length() == 0:
            return []

        # point
        if isinstance(other, Vector):
            if self.dir.multiple_of(other - self.start): # point on self
                if self.value_at(other) is not None:
                    return [other]
            return []

        if isinstance(other, drawable):
            if type(other) is Ray:
                if self.dir.multiple_of(other.dir): # linear depentant
                    return self.intersect(other.start)

                if self.dir.x == 0:
                    # switch vectors for gauss algorithm
                    return other.intersect(self)

                matrix = [
                    [self.dir.x, -other.dir.x, other.start.x - self.start.x],
                    [self.dir.y, -other.dir.y, other.start.y - self.start.y],
                ]

                # gauss algorithm
                matrix[0][1] /= matrix[0][0]
                matrix[0][2] /= matrix[0][0]
                matrix[1][1] -= matrix[1][0] * matrix[0][1]
                matrix[1][2] -= matrix[1][0] * matrix[0][2]
                matrix[1][2] /= matrix[1][1]
                matrix[0][2] -= matrix[0][1] * matrix[1][2]

                if matrix[0][2] >= 0 and matrix[1][2] >= 0:
                    return [self.point_at(matrix[0][2])]
                return []

            raise NotImplementedError # for other drawables

        raise TypeError(f"Expected drawable objects or vector, but '{other.__class__.__name__}' found")


    def draw(self, screen, offset):
        """
        Draw 'self' as an infinite ray on 'screen'.
        """

        ray = Ray(self.start, self.offscreen(screen, offset))

        # calculate real position on screen
        rect = Vector(*screen.get_rect()[2:])
        for i, _ in enumerate(ray):
            ray[i] = round(ray[i] - offset + rect / 2)

        if ray.dir: # != 0
            pygame.draw.aaline(screen, self.color, ray[0], ray[1])

</file>

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----


==== Polygon ====
<file python polygon.py>
from drawable import *
from ray import *


class Polygon(drawable):
    """
    Polygon class as drawable object. Implements functionality of abstract drawable class.
    """


    # constructor: create self as drawable object
    def __init__(self, *points, color=(0,0,0)):
        drawable.__init__(self, *points, color=color)


    # Implements draw() method of abstract drawable class
    def draw(self, screen, offset):
        if not self: # empty
            return

        polygon = self.copy()

        # move to real position on screen
        rect = Vector(*screen.get_rect()[2:])
        for i, _ in enumerate(polygon):
            polygon[i] = round(polygon[i] - offset + rect / 2)
            if polygon[i].length2() > 30000:
                return

        if len(polygon) == 1:
            pygame.gfxdraw.pixel(screen, *polygon[0], self.color)
        elif len(polygon) == 2:
            pygame.draw.aaline(screen, self.color, polygon[0], polygon[1])
        else:
            pygame.gfxdraw.aapolygon(screen, polygon, self.color)
            pygame.gfxdraw.filled_polygon(screen, polygon, self.color)


    # Implements draw_shadow() from abstract drawable class
    def draw_shadow(self, screen, offset, source, color=(31,31,31)):
        if len(self) == 0:
            return

        elif len(self) == 1:
            Ray(self[0], self[0] - source, color=color).draw(screen, offset)

        elif len(self) == 2:
            if not self[0].onscreen(screen, offset) and not self[1].onscreen(screen, offset):
                return

            if self[0] == source or self[1] == source:
                for point in self:
                    Ray(point, point - source, color=color).draw(screen, offset)
            else:
                rect = screen.get_rect()
                corner = Vector(*rect[2:]) / 2
                corners = [
                    corner * Vector( 1, 1),
                    corner * Vector(-1, 1),
                    corner * Vector(-1,-1),
                    corner * Vector( 1,-1),
                    corner * Vector( 1, 1),
                    corner * Vector( 1,-1),
                ]

                ray1 = Ray(self[0], self[0] - source)
                ray2 = Ray(self[1], self[1] - source)
                if ray1.dir.angle_to(ray2.dir) > 180:
                    ray1, ray2 = ray2, ray1

                shadow = Polygon(color=color)
                shadow.append(ray2.offscreen(screen, offset))
                shadow.append(ray2.start)
                shadow.append(ray1.start)
                shadow.append(ray1.offscreen(screen, offset))

                for i, _ in enumerate(corners[1:-1]):
                    if corners[i].is_between(ray1.dir, ray2.dir):
                        if corners[i-1].is_between(ray1.dir, ray2.dir):
                            shadow.append(offset + corners[i-1])
                        shadow.append(offset + corners[i])
                        if corners[i+1].is_between(ray1.dir, ray2.dir):
                            shadow.append(offset + corners[i+1])
                        break

                shadow.draw(screen, offset)

        else:
            for i, _ in enumerate(self[:-1]):
                Polygon(self[i], self[i+1]).draw_shadow(screen, offset, source)
            Polygon(self[-1], self[0]).draw_shadow(screen, offset, source)


    # Implements dist_to() method of abstract drawable class
    def dist_to(self, source):
        def sdf_line(a, b, p):
            b_a = b - a
            p_a = p - a
            if b == a:
                h = 0
            else:
                h = min(1, max(0, p_a.dot(b_a) / b_a.dot(b_a)))
            return (p_a - h * b_a).length()

        if len(self) == 0:
            return float('inf')

        if len(self) == 1:
            return (source - self[0]).length()

        else:
            m = float('inf')
            for i, _ in enumerate(self):
                m = min(m, sdf_line(self[i-1], self[i], source))
            return m


    # Implements cut() from abstract drawable class
    def cut(self, source, portal):
        def position(point):
            vec = point - source
            if vec.is_between(ray1.dir, ray2.dir):
                if (point - ray1.start).is_between(ray1.dir, border.dir):
                    return 1
                else:
                    return -1

            if vec.is_between(null, ray1.dir):
                return 0
            if vec.is_between(ray2.dir, null):
                return 2

        ray1 = Ray(portal[0], portal[0] - source)
        ray2 = Ray(portal[1], portal[1] - source)
        border = Ray(ray1.start, ray2.start - ray1.start)
        if ray1.dir.angle_to(ray2.dir) > 180:
            ray1, ray2 = ray2, ray1
        rest = Polygon()
        rest.__dict__ = self.__dict__
        null = -(ray1.dir + ray2.dir)

        if len(self) == 0:
            return rest

        if len(self) == 2:
            if self[0] in portal and self[1] in portal:
                return rest

        nxt_pos = position(self[-1])
        for i, _ in enumerate(self):
            cur_pos = nxt_pos
            nxt_pos = position(self[i])

            if cur_pos == 1:
                rest.append(self[i-1])

            if nxt_pos == cur_pos:
                continue

            inter = []

            if 1 in (cur_pos, nxt_pos):
                if 0 in (cur_pos, nxt_pos):
                    inter += ray1.intersect(Ray(self[i-1], self[i] - self[i-1]))
                elif 2 in (cur_pos, nxt_pos):
                    inter += ray2.intersect(Ray(self[i-1], self[i] - self[i-1]))
                if not inter: # empty
                    inter += border.intersect(Ray(self[i-1], self[i] - self[i-1]))

            elif -1 in (cur_pos, nxt_pos):
                if 0 in (cur_pos, nxt_pos):
                    inter += [ray1.start]
                else: # 2
                    inter += [ray2.start]

            else: # 0 and 2
                if cur_pos == 0:
                    inter += ray1.intersect(Ray(self[i-1], self[i] - self[i-1]))
                    inter += ray2.intersect(Ray(self[i-1], self[i] - self[i-1]))
                else: # 2
                    inter += ray2.intersect(Ray(self[i-1], self[i] - self[i-1]))
                    inter += ray1.intersect(Ray(self[i-1], self[i] - self[i-1]))

            for pt in inter:
                if pt.length2() > 10000:
                    print(f"CalculationError while cutting {self} at {ray1, ray2}:\n    {pt} is very big")
                else:
                    rest.append(pt)

        if nxt_pos == 1:
            rest.append(self[-1])

        return rest

</file>

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----


==== Floor ====
<file python floor.py>
import colors
from polygon import *

class Floor(Polygon):
    """
    Class for polygons just drawn on the floor as drawable object. Implements functionality of abstract drawable class.
    """


    # constructor: create self as drawable object
    def __init__(self, *points, color=colors.DARK_RED):
        Polygon.__init__(self, *points, color=color)


    # Implements draw_shadow() from abstract drawable class
    def draw_shadow(self, screen, offset, source, color=None):
        pass


    # Implements cut() from abstract drawable class
    def cut(self, source, portal):
        rest = Polygon.cut(self, source, portal)
        if len(rest) > 2:
            return Floor(*rest, color=self.color)

        return Polygon()


    def dist_to(self, source):
        return float('inf')

</file>

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----


==== Portal ====
<file python portal.py>
from polygon import *
from matrix import *
import colors


class Portal(Polygon):
    """
    Portal class as drawable object. Implements functionality of abstract drawable class.
    """


    # constructor: create self as Polygon object
    def __init__(self, start, end, M=((1,0),(0,1)), M2=None, offset=None, offset2=None, color=(0,0,255)):
        Polygon.__init__(self, start, end, color=color)
        self.M = Matrix(*M)
        if M2 is None:
            self.M2 = self.M.inverse()
        else:
            self.M2 = Matrix(*M2)
        if offset is None:
            self.offset = None
        else:
            self.offset = Vector(*offset)
        if offset2 is None:
            self.offset2 = None
        else:
            self.offset2 = Vector(*offset2)


    # Overrides attribute access
    def __getattr__(self, attr):
        """
        Return 'self[0]' and 'self[1]' as attribute 'start' and 'end'.
        """

        if attr == 'start':
            return self[0]
        if attr == 'end':
            return self[1]
        if attr == 'M':
            return self.__dict__['M']
        if attr == 'offset':
            return self.__dict__['offset']
        if attr == 'color':
            return self.__dict__['color']

        raise AttributeError(f"{self.__class__.__name__} has no Attribute {attr}.")


    def go_through(self, dir, world):
        portal_world = []

        for object in world:
            port = object.__class__(*object)
            port.__dict__ = object.__dict__

            if dir.is_between(self.end - self.start, self.start - self.end):
                for i, _ in enumerate(object):
                    if self.offset is None:
                        offset = self.M.prod((self.start + self.end) / 2) - (self.start + self.end) / 2
                    else:
                        offset = self.offset

                    port[i] = self.M.prod(object[i]) - offset

                if type(object) is Portal:
                    if self.M.i.angle_to(self.M.j) > 180:
                        port[0], port[1] = port[1], port[0]
            else:
                for i, _ in enumerate(object):
                    if self.offset2 is None:
                        offset2 = self.M2.prod((self.start + self.end) / 2) - (self.start + self.end) / 2
                    else:
                        offset2 = self.offset2

                    port[i] = self.M2.prod(object[i]) - offset2

                if type(object) is Portal:
                    if self.M2.i.angle_to(self.M2.j) > 180:
                        port[0], port[1] = port[1], port[0]

            portal_world.append(port)

        return portal_world


    def portal_world(self, world, source):
        portal_world = []

        for object in world:
            port = object.__class__(*object)
            port.__dict__ = object.__dict__

            if (self.start - source).is_between(self.end - self.start, self.start - self.end):
                for i, _ in enumerate(object):
                    if self.offset is None:
                        offset = self.M.prod((self.start + self.end) / 2) - (self.start + self.end) / 2
                    else:
                        offset = self.offset

                    port[i] = self.M.prod(object[i]) - offset

                if type(object) is Portal:
                    if self.M.i.angle_to(self.M.j) > 180:
                        port[0], port[1] = port[1], port[0]
            else:
                for i, _ in enumerate(object):
                    if self.offset2 is None:
                        offset2 = self.M2.prod((self.start + self.end) / 2) - (self.start + self.end) / 2
                    else:
                        offset2 = self.offset2

                    port[i] = self.M2.prod(object[i]) - offset2

                if type(object) is Portal:
                    if self.M2.i.angle_to(self.M2.j) > 180:
                        port[0], port[1] = port[1], port[0]

            cut = port.cut(source, self)
            if cut: # not empty
                portal_world.append(cut)

        return portal_world


    def draw(self, screen, offset):
        pass

    # overrides draw_shadow() inherited from Polygon class
    def draw_shadow(self, screen, offset, source):
        """
        Draws shadow of portal
        Called by 'self.draw_shadow(screen, offset)'
        """

        Polygon.draw_shadow(self, screen, offset, source, color=colors.GRAY)
        # Polygon.draw_shadow(self, screen, offset, source, color=(150,150,150))

        for point in self:
            Ray(point, point - source, color=(0,0,0)).draw(screen, offset)


    # Implements cut() from abstract drawable class
    def cut(self, source, portal):
        rest = Polygon.cut(self, source, portal)
        if len(rest) >= 2:
            return Portal(*reversed(rest[:2]), M=self.M, color=self.color)

        return Polygon()

</file>

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