Rubik's Cube

How it works

Code

from ursina import *


app = Ursina()

cube_colors = [
    color.pink,     # right
    color.orange,   # left
    color.white,    # top
    color.yellow,   # bottom
    color.azure,    # back
    color.green,    # front
]

# make a model with a separate color on each face
combine_parent = Entity(enabled=False)
for i, direction in enumerate((Vec3.right, Vec3.up, Vec3.forward)):

    e = Entity(parent=combine_parent, model='plane', origin_y=-.5, texture='white_cube', color=cube_colors[i*2])
    e.look_at(direction, Vec3.up)

    e_flipped = Entity(parent=combine_parent, model='plane', origin_y=-.5, texture='white_cube', color=cube_colors[(i*2)+1])
    e_flipped.look_at(-direction, Vec3.up)

combine_parent.combine()


# place 3x3x3 cubes
cubes = []
for x in range(3):
    for y in range(3):
        for z in range(3):
            e = Entity(model=copy(combine_parent.model), position=Vec3(x,y,z) - (Vec3(3,3,3)/3), texture='white_cube')
            cubes.append(e)


# rotate a side when we click on it
collider = Entity(model='cube', scale=3, collider='box', visible=False)

def collider_input(key):
    if mouse.hovered_entity == collider:
        if key == 'left mouse down':
            rotate_side(mouse.normal, 1)
        elif key == 'right mouse down':
            rotate_side(mouse.normal, -1)

collider.input = collider_input


rotation_helper = Entity()


def rotate_side(normal, direction=1, speed=1):
    if normal == Vec3(1,0,0):
        [setattr(e, 'world_parent', rotation_helper) for e in cubes if e.x > 0]
        rotation_helper.animate('rotation_x', 90 * direction, duration=.15*speed, curve=curve.linear, interrupt='finish')
    elif normal == Vec3(-1,0,0):
        [setattr(e, 'world_parent', rotation_helper) for e in cubes if e.x < 0]
        rotation_helper.animate('rotation_x', -90 * direction, duration=.15*speed, curve=curve.linear, interrupt='finish')

    elif normal == Vec3(0,1,0):
        [setattr(e, 'world_parent', rotation_helper) for e in cubes if e.y > 0]
        rotation_helper.animate('rotation_y', 90 * direction, duration=.15*speed, curve=curve.linear, interrupt='finish')
    elif normal == Vec3(0,-1,0):
        [setattr(e, 'world_parent', rotation_helper) for e in cubes if e.y < 0]
        rotation_helper.animate('rotation_y', -90 * direction, duration=.15*speed, curve=curve.linear, interrupt='finish')

    elif normal == Vec3(0,0,1):
        [setattr(e, 'world_parent', rotation_helper) for e in cubes if e.z > 0]
        rotation_helper.animate('rotation_z', -90 * direction, duration=.15*speed, curve=curve.linear, interrupt='finish')
    elif normal == Vec3(0,0,-1):
        [setattr(e, 'world_parent', rotation_helper) for e in cubes if e.z < 0]
        rotation_helper.animate('rotation_z', 90 * direction, duration=.15*speed, curve=curve.linear, interrupt='finish')


    invoke(reset_rotation_helper, delay=.2*speed)

    if speed:
        collider.ignore_input = True
        @after(.25*speed)
        def _():
            collider.ignore_input = False
            check_for_win()


def reset_rotation_helper():
    [setattr(e, 'world_parent', scene) for e in cubes]
    rotation_helper.rotation = (0,0,0)


win_text_entity = Text(y=.35, text='', color=color.green, origin=(0,0), scale=3)

def check_for_win():
    if {e.world_rotation for e in cubes} == {Vec3(0,0,0)}:
        win_text_entity.text = 'SOLVED!'
        win_text_entity.appear()
    else:
        win_text_entity.text = ''


def randomize():
    faces = (Vec3(1,0,0), Vec3(0,1,0), Vec3(0,0,1), Vec3(-1,0,0), Vec3(0,-1,0), Vec3(0,0,-1))
    for i in range(20):
        rotate_side(normal=random.choice(faces), direction=random.choice((-1,1)), speed=0)

randomize_button = Button(text='randomize', color=color.azure, position=(.7,-.4), on_click=randomize)
randomize_button.fit_to_text()

window.color = color._16
EditorCamera()

app.run()