panda3d/direct/src/controls/ObserverWalker.py

"""
ObserverWalker.py is for avatars.

A walker control such as this one provides:

- creation of the collision nodes
- handling the keyboard and mouse input for avatar movement
- moving the avatar

it does not:

- play sounds
- play animations

although it does send messages that allow a listener to play sounds or
animations based on walker events.
"""

from panda3d.core import *
from direct.directnotify import DirectNotifyGlobal
from . import NonPhysicsWalker

class ObserverWalker(NonPhysicsWalker.NonPhysicsWalker):
    notify = DirectNotifyGlobal.directNotify.newCategory("ObserverWalker")

    # Ghosts slide instead of jump:
    slideName = "jump"

    def initializeCollisions(self, collisionTraverser, avatarNodePath,
            avatarRadius = 1.4, floorOffset = 1.0, reach = 1.0):
        """
        Set up the avatar for collisions
        """
        """
        Set up the avatar for collisions
        """
        assert not avatarNodePath.isEmpty()

        self.cTrav = collisionTraverser
        self.avatarNodePath = avatarNodePath

        # Set up the collision sphere
        # This is a sphere on the ground to detect barrier collisions
        self.cSphere = CollisionSphere(0.0, 0.0, 0.0, avatarRadius)
        cSphereNode = CollisionNode('Observer.cSphereNode')
        cSphereNode.addSolid(self.cSphere)
        self.cSphereNodePath = avatarNodePath.attachNewNode(cSphereNode)

        cSphereNode.setFromCollideMask(self.cSphereBitMask)
        cSphereNode.setIntoCollideMask(BitMask32.allOff())

        # set up wall collision mechanism
        self.pusher = CollisionHandlerPusher()
        self.pusher.setInPattern("enter%in")
        self.pusher.setOutPattern("exit%in")

        self.pusher.addCollider(self.cSphereNodePath, avatarNodePath)

        # activate the collider with the traverser and pusher
        self.setCollisionsActive(1)

        class Foo:
            def hasContact(self):
                return 1

        self.lifter = Foo()

    def deleteCollisions(self):
        del self.cTrav

        del self.cSphere
        self.cSphereNodePath.removeNode()
        del self.cSphereNodePath

        del self.pusher

    def setCollisionsActive(self, active = 1):
        assert self.debugPrint("setCollisionsActive(active%s)"%(active,))
        if self.collisionsActive != active:
            self.collisionsActive = active
            if active:
                self.cTrav.addCollider(self.cSphereNodePath, self.pusher)
            else:
                self.cTrav.removeCollider(self.cSphereNodePath)

                # Now that we have disabled collisions, make one more pass
                # right now to ensure we aren't standing in a wall.
                self.oneTimeCollide()

    def oneTimeCollide(self):
        """
        Makes one quick collision pass for the avatar, for instance as
        a one-time straighten-things-up operation after collisions
        have been disabled.
        """
        tempCTrav = CollisionTraverser("oneTimeCollide")
        tempCTrav.addCollider(self.cSphereNodePath, self.pusher)
        tempCTrav.traverse(render)

    def enableAvatarControls(self):
        """
        Activate the arrow keys, etc.
        """
        assert self.debugPrint("enableAvatarControls")
        pass

    def disableAvatarControls(self):
        """
        Ignore the arrow keys, etc.
        """
        assert self.debugPrint("disableAvatarControls")
        pass