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Vector

class miniworldmaker.board_positions.board_vector.Vector(x, y)

Describes a two dimensional vector.

It is used to describe a position, acceleration or velocity.

Examples

Create a circle which follows the mouse.

from miniworldmaker import *
board = Board(800, 800)

mover = Circle()
mover.velocity = Vector(0, 0)
mover.topspeed = 10


@board.register
def act(self):
    mouse_vec = Vector(board.get_mouse_x(), board.get_mouse_y())
    location = Vector.from_token_position(mover)
    acceleration = mouse_vec - location
    acceleration.normalize() * 2

mover.velocity.add(acceleration)
mover.velocity.limit(mover.topspeed)
mover.move_vector(mover.velocity)

board.run()

Public Data Attributes:

angle	describes the angle as miniworldmaker direction
x	the x compoonent of the vector
y	the y component of the vector

Public Methods:

__init__(x, y)
from_tokens(t1, t2)	Create a vector from two tokens.
from_direction(direction)	Creates a vector from miniworldmaker direction.
from_token_direction(token)	Creates a vector from token direction
from_token_position(token)	Creates a vector from token position
rotate(theta)	rotates Vector by theta degrees
to_direction()	Returns miniworldmaker direction from vector.
get_normal()
normalize()	sets length of vector to 1
length()	returns length of vector
neg()	returns -v for Vector v
multiply(other)	product self * other: * returns product, if other is scalar (return-type: Vector) * returns dot-product, if other is vector (return-type: float) :param other: a scalar or vector
dot(other)
add_to_position(position)	rtype Position
__str__()	Return str(self).
__neg__()
__mul__(other)
__sub__(other)
__add__(other)
sub(other)	adds vector other from self.
add(other)	adds vector other to self.
limit(value)	limits length of vector to value

---

add(other)

adds vector other to self.

Parameters

other (Vector) – other Vector

Returns

self + other

Examples

Add two vectors:

v = Vector(3, 1)
u = Vector(2, 5)
print(u.add(v)) # (5, 6)

Alternative:

print(u + v)

Return type

Vector

property angle

describes the angle as miniworldmaker direction

classmethod from_direction(direction)

Creates a vector from miniworldmaker direction.

classmethod from_token_direction(token)

Creates a vector from token direction

Examples

Creates rotating rectangle

from miniworldmaker import *

board = Board()

player = Rectangle((200,200),40, 40)
player.speed = 1
player.direction = 80

@player.register
def act(self):
    v1 = Vector.from_token_direction(self)
    v1.rotate(-1)
    self.direction = v1

board.run()

classmethod from_token_position(token)

Creates a vector from token position

classmethod from_tokens(t1, t2)

Create a vector from two tokens.

The vector desribes is generated from: token2.center - token1.center

length()

returns length of vector

Examples

Length of vector

w = Vector(4, 3)
print(w.length())     # 5

Return type

float

limit(value)

limits length of vector to value

multiply(other)

product self * other: * returns product, if other is scalar (return-type: Vector) * returns dot-product, if other is vector (return-type: float) :param other: a scalar or vector

Examples

Product and dot-product:

a = 5
u1 = Vector(2, 4)
u2 = Vector(2, 4)
v = Vector(3, 1)
print(u1.multiply(a)) # (10, 25)
print(u2.multiply(v)) # 11

Alternative:

print(u1 * a)  # 25
print(u1 * v) # 25

Return type

Union[float, Vector]

neg()

returns -v for Vector v

Examples

Inverse of vector:

u = Vector(2, 4)
print(u.neg()) # (-2, 5)

Alternative:

print(- u)  # (-2, 5)

Return type

Vector

normalize()

sets length of vector to 1

Examples

Normalized vector with length 1:

w = Vector(4, 3)
print(w.length())     # 5
print(w.normalize()) #  (0.8, 0.6)

Return type

Vector

rotate(theta)

rotates Vector by theta degrees

Return type

Vector

sub(other)

adds vector other from self.

Parameters

other (Vector) – other Vector

Returns

self + other

Examples

Subtracts two vectors:

v = Vector(3, 1)
u = Vector(2, 5)
print(u.sub(v)) # (1, -4)

Alternative:

print(u - v)

Return type

Vector

to_direction()

Returns miniworldmaker direction from vector.

Return type

float

property x

the x compoonent of the vector

property y

the y component of the vector

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