## ~boringcactus/turtle3D-grasshopper

turtle3D-grasshopper/turtle3D.py -rw-r--r-- 5.4 KiB
c7eda59f — Melody Horn move primary links to github 1 year, 7 months ago
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```import math
import rhinoscriptsyntax as rs

__all__ = ['Turtle']

class Turtle:
"""Represents a turtle in 3D space."""
def __init__(self):
"""Creates a turtle at the origin, looking along the Y axis with its right side towards the X axis."""
self._forward = rs.CreateVector(0, 1, 0)
self._right = rs.CreateVector(1, 0, 0)
self._position = rs.CreatePoint(0, 0, 0)
self._this_line = []
self._lines = []
self._pen_down = False

def forward(self, distance):
"""Moves the turtle forward by the given distance. If the pen is down, adds a line along the path moved."""
new_position = rs.PointAdd(self._position, rs.VectorScale(self._forward, distance))
if self._pen_down:
self._this_line.append(new_position)
self._position = new_position

def backward(self, distance):
"""Moves the turtle backward by the given distance. If the pen is down, adds a line along the path moved."""
self.forward(-distance)

def left(self, angle):
"""Turns the turtle to the left by the given angle in degrees."""
up = rs.VectorCrossProduct(self._right, self._forward)
self._forward = rs.VectorRotate(self._forward, angle, up)
self._right = rs.VectorRotate(self._right, angle, up)

def right(self, angle):
"""Turns the turtle to the right by the given angle in degrees."""
self.left(-angle)

def tiltup(self, angle):
"""Tilts the turtle upwards by the given angle in degrees."""
self._forward = rs.VectorRotate(self._forward, angle, self._right)

def tiltdown(self, angle):
"""Tilts the turtle downwards by the given angle in degrees."""
self.tiltup(-angle)

def spincw(self, angle):
"""Spins the turtle clockwise by the given angle in degrees."""
self._right = rs.VectorRotate(self._right, angle, self._forward)

def spinccw(self, angle):
"""Spines the turtle counterclockwise by the given angle in degrees."""
self.spincw(-angle)

def setpos(self, x, y=None, z=None):
"""Sets the turtle's position to the given coordinates. If the pen is down, adds a line along the path moved.

If y and z are omitted, assumes x is a point.
If z is omitted, assumes z is 0."""
if y is None and z is None:
x, y, z = x
if z is None:
z = 0
new_position = rs.CreatePoint(x, y, z)
if self._pen_down:
self._this_line.append(new_position)
self._position = new_position

def setx(self, x):
"""Sets the X coordinate of the turtle's position to the given coordinates. If the pen is down, adds a line along the path moved."""
self.setpos(x, self._position.Y, self._position.Z)

def sety(self, y):
"""Sets the Y coordinate of the turtle's position to the given coordinates. If the pen is down, adds a line along the path moved."""
self.setpos(self._position.X, y, self._position.Z)

def setz(self, z):
"""Sets the Z coordinate of the turtle's position to the given coordinates. If the pen is down, adds a line along the path moved."""
self.setpos(self._position.X, self._position.Y, z)

#def settilt(self, angle):
#    pass # uhhhhhh

#def setturn(self, angle):
#    pass # uhhhhhh

#def setspin(self, angle):
#    pass # uhhhhhhh

def home(self):
"""Resets the position, direction, pen status, and lines of this turtle."""
self.__init__()

def position(self):
"""Gets the position of this turtle as a point."""
return rs.CreatePoint(self._position)

def xcor(self):
"""Gets the X coordinate of the turtle's position."""
return self._position.X

def ycor(self):
"""Gets the Y coordinate of the turtle's position."""
return self._position.Y

def zcor(self):
"""Gets the Z coordinate of the turtle's position."""
return self._position.Z

def tilt(self):
"""Gets the turtle's current tilt angle in degrees, with positive angles denoting an upwards tilt."""
return math.degrees(math.atan2(self._forward.Z, math.sqrt(self._forward.X ** 2 + self._forward.Y ** 2)))

def turn(self):
"""Gets the turtle's current turn angle in degrees, with positive angles denoting a rightwards turn."""
return math.degrees(math.atan2(self._forward.X, self._forward.Y))

def spin(self):
"""Gets the turtle's current spin angle in degrees, with positive angles denoting a clockwise spin."""
return math.degrees(math.atan2(self._right.Z, math.sqrt(self._right.X ** 2 + self._right.Y ** 2)))

def pendown(self):
"""Puts the turtle's pen down, so it starts drawing lines."""
self._pen_down = True
if len(self._this_line) == 0:
self._this_line.append(self._position)

def penup(self):
"""Lifts the turtle's pen up, so it stops drawing lines."""
self._pen_down = False
if len(self._this_line) > 1:
self._this_line = []

def lines(self):
"""Gets the list of (poly)lines the turtle has drawn."""
if self._pen_down:
self.penup()
return list(self._lines)

_implicit_turtle = Turtle()
for key in Turtle.__dict__.keys():
if not key.startswith('__'):
globals()[key] = getattr(_implicit_turtle, key)
__all__.append(key)
```