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+"""
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+GhostWalker.py is for avatars.
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+
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+A walker control such as this one provides:
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+ - creation of the collision nodes
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+ - handling the keyboard and mouse input for avatar movement
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+ - moving the avatar
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+
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+it does not:
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+ - play sounds
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+ - play animations
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+
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+although it does send messeges that allow a listener to play sounds or
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+animations based on walker events.
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+"""
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+
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+from ShowBaseGlobal import *
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+
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+import DirectNotifyGlobal
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+import NonPhysicsWalker
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+
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+class GhostWalker(NonPhysicsWalker.NonPhysicsWalker):
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+
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+ notify = DirectNotifyGlobal.directNotify.newCategory("GhostWalker")
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+
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+ def handleAvatarControls(self, task):
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+ """
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+ Check on the arrow keys and update the avatar.
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+ """
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+ # get the button states:
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+ forward = inputState.isSet("forward")
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+ reverse = inputState.isSet("reverse")
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+ turnLeft = inputState.isSet("turnLeft")
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+ turnRight = inputState.isSet("turnRight")
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+ # Ghosts slide instead of jump:
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+ slide = inputState.isSet("jump")
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+ # Determine what the speeds are based on the buttons:
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+ self.speed=(forward and self.avatarControlForwardSpeed or
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+ reverse and -self.avatarControlReverseSpeed)
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+ # Should fSlide be renamed slideButton?
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+ self.slideSpeed=slide and (
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+ (turnLeft and -self.avatarControlForwardSpeed) or
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+ (turnRight and self.avatarControlForwardSpeed))
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+ self.rotationSpeed=not slide and (
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+ (turnLeft and self.avatarControlRotateSpeed) or
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+ (turnRight and -self.avatarControlRotateSpeed))
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+
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+ # How far did we move based on the amount of time elapsed?
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+ dt=min(ClockObject.getGlobalClock().getDt(), 0.1)
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+ # Check to see if we're moving at all:
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+ if self.speed or self.slideSpeed or self.rotationSpeed:
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+ if self.stopThisFrame:
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+ distance = 0.0
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+ slideDistance = 0.0
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+ rotation = 0.0
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+ self.stopThisFrame = 0
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+ else:
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+ distance = dt * self.speed
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+ slideDistance = dt * self.slideSpeed
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+ rotation = dt * self.rotationSpeed
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+
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+ # Take a step in the direction of our previous heading.
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+ self.vel=Vec3(Vec3.forward() * distance +
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+ Vec3.right() * slideDistance)
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+ if self.vel != Vec3.zero():
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+ # rotMat is the rotation matrix corresponding to
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+ # our previous heading.
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+ rotMat=Mat3.rotateMatNormaxis(self.avatarNodePath.getH(), Vec3.up())
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+ step=rotMat.xform(self.vel)
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+ self.avatarNodePath.setFluidPos(Point3(self.avatarNodePath.getPos()+step))
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+ self.avatarNodePath.setH(self.avatarNodePath.getH()+rotation)
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+ messenger.send("avatarMoving")
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+ else:
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+ self.vel.set(0.0, 0.0, 0.0)
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+ return Task.cont
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Dave Schuyler