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# The contents of this file are subject to the Mozilla Public License Version
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# The Original Code is the Python Computer Graphics Kit.
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# The Initial Developer of the Original Code is Matthias Baas.
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# $Id: autocam.py,v 1.1.1.1 2004/12/12 14:30:54 mbaas Exp $
## \file autocam.py
## Contains the AutoCam class.
"""This module contains the AutoCam class."""
from Interfaces import *
import protocols
import slots
import _core
from eventmanager import eventManager
from scene import getScene
import events
from cgtypes import *
from component import *
# AutoCam
class AutoCam(Component):
"""AutoCam
"""
protocols.advise(instancesProvide=[ISceneItem])
def __init__(self, name="AutoCam"):
Component.__init__(self, name=name)
# Input
self.input_slot = slots.Vec3Slot()
self.addSlot("input", self.input_slot)
# Output
self.output_slot = slots.Vec3Slot()
self.addSlot("output", self.output_slot)
self.accel_factor = 0.5
self.out_offset = vec3(0,0,0)
self.out = vec3(0,0,0)
self.out_velocity = vec3(0,0,0)
eventManager().connect(events.STEP_FRAME, self)
def protocols(self):
return [ISceneItem, IComponent, IWorldObject, ICamera]
# def destroy(self):
# del self.fov_slot
# del self.target_slot
def onStepFrame(self):
dt = getScene().timer().timestep
diff = self.input-self.out
if (diff.length()<1.0):
a = -0.75*self.out_velocity
else:
a = self.accel_factor*(self.input-self.out)
self.out_velocity += dt*a
self.out = self.out + dt*self.out_velocity
self.output = self.out+self.out_offset
## protected:
# "input" property...
exec slotPropertyCode("input")
# "output" property...
exec slotPropertyCode("output")
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