def __init__(self, pos=DEFAULT_POS, vpn=DEFAULT_VPN, up=DEFAULT_UP, \
moveSpeed=DEFAULT_MOVESPEED, rotateSpeed=DEFAULT_ROTATESPEED):
# Cacheable: keep track of observers
self.__dict__['observers'] = []
self.pos = pos
self.vpn = normalize3D(vpn)
self.up = normalize3D(up)
self.moveSpeed = moveSpeed
self.rotateSpeed = rotateSpeed
# Tracking parameters that are used when drawing
self.trackPosOffset = None
self.trackRotMatrix = None
def __getattr__(self, name):
"""dynamic attributes:
- Camera.yz: the vector mutually perpendicular to up and vpn
- Camera.lookAt: world-space point the camera looks at"""
# cross product lifted from
# http://www.physics.uoguelph.ca/tutorials/torque/Q.torque.cross.html
if name == 'yz':
yz = ( # Cx = AyBz - AzBy
self.vpn[Y_AXIS] * self.up[Z_AXIS] - \
self.vpn[Z_AXIS] * self.up[Y_AXIS], # Cy = AzBx - AxBz
self.vpn[Z_AXIS] * self.up[X_AXIS] - \
self.vpn[X_AXIS] * self.up[Z_AXIS], #Cz = AxBy - AyBx:
self.vpn[X_AXIS] * self.up[Y_AXIS] - \
self.vpn[Y_AXIS] * self.up[X_AXIS])
return normalize3D(yz)
elif name == 'lookAt':
# Add the vpn to the current world-space position
return (self.pos[0] + self.vpn[0],
self.pos[1] + self.vpn[1],
self.pos[2] + self.vpn[2])
raise AttributeError, "Camera object has no attribute '%s'" % (name)
#!/usr/bin/python2.3
from math import tan, atan, atan2, cos, acos, sin, asin, sqrt, pi
from utilities import diff3D, dist3D, add3D, normalize3D, rotate3D, dot_product
import sys
try:
from twisted.spread import pb
except ImportError:
from fakepb import pb
DEFAULT_POS = (0.0, 0.0, 40.0)
DEFAULT_TAIL = normalize3D((-2.0, -2.0, 0.0))
DEFAULT_ROT = (1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0)
DEFAULT_COLOR = (0.6, 0.6, 0.9)
DEFAULT_ALPHA = 1.0
class Cursor(pb.Cacheable):
"""
A 3D active cursor, designed to be controlled by
an active 3D input device.
Important to note - the cursor's native position is relative to
the camera and is in camera coordinates (i.e. +Z is away from the
camera, +X is on camera's left)
"""
def __init__(self, pos=DEFAULT_POS, rot=DEFAULT_ROT, color=DEFAULT_COLOR, alpha=DEFAULT_ALPHA):
