Source code for direct.distributed.GridParent

from panda3d.core import *
from import *

# Any object that can be parented to the ocean grid
# (or any grid whose size is too large to represent in 16 bits),
# should derive from GridParent.  Can be used on client and AI code.

# GridParent will put a node inbetween the object and the grid so
# that the object is broadcasting its position relative to the gridCell
# it lies in.

[docs]class GridParent: # this lets GridParents share CellOrigins GridZone2CellOrigin = {} GridZone2count = {}
[docs] @staticmethod def getCellOrigin(grid, zoneId): tup = (grid, zoneId) if tup not in GridParent.GridZone2count: GridParent.GridZone2count[tup] = 0 # For readability when debugging, append the zone to the name GridParent.GridZone2CellOrigin[tup] = grid.attachNewNode("cellOrigin-%s" % zoneId) # Get grid cell origin cellPos = grid.getZoneCellOrigin(zoneId) # Set the gridNode's position GridParent.GridZone2CellOrigin[tup].setPos(*cellPos) GridParent.GridZone2count[tup] += 1 return GridParent.GridZone2CellOrigin[tup]
[docs] @staticmethod def releaseCellOrigin(grid, zoneId): tup = (grid, zoneId) GridParent.GridZone2count[tup] -= 1 if GridParent.GridZone2count[tup] == 0: del GridParent.GridZone2count[tup] GridParent.GridZone2CellOrigin[tup].removeNode() del GridParent.GridZone2CellOrigin[tup]
[docs] def __init__(self, av): # The object on the grid will need to broadcast his position relative to # his current grid cell in order to use 16 bit # telemetry. To do this, we will have a node attached to the # grid cell origin, and the object will wrtReparent himself to it when # crossing into that grid cell. We don't need to create a node for each # cell origin. We just need two nodes: one that we are currently parented # to, and the other that we will wrtReparentTo. Just before wrtReparenting # to the new node, set it's position to the new grid cell origin. self.av = av self.grid = None # NOTE: this node gets renamed when it is put on a zone, so if you # are looking for it by name, try cellOrigin*. self.ownCellOrigin = NodePath("cellOrigin") self.cellOrigin = self.ownCellOrigin
[docs] def delete(self): if self.av: if self.av.getParent() == self.cellOrigin: self.av.detachNode() del self.av self.av = None # Remove the gridNodes if self.ownCellOrigin is not None: self.ownCellOrigin.removeNode() self.ownCellOrigin = None if self.grid is not None: self.releaseCellOrigin(self.grid, self.zoneId) self.grid = None self.zoneId = None
[docs] def setGridParent(self, grid, zoneId, teleport=0): # If teleport=0, preserve the avatar's absolute position. If teleport=1 # the avatars previous world position is invalid, so don't wrtReparent, # just do a regular reparent, and let the cellOrigin give us our new position # Also, if the avatar has no parent, then force teleport=1 if self.av.getParent().isEmpty(): teleport = 1 if not teleport: # Stick the avatar under hidden while we move the cellOrigin into # position so we do not lose the avatars absolute position. self.av.wrtReparentTo(hidden) if self.grid is not None: self.releaseCellOrigin(self.grid, self.zoneId) self.grid = grid self.zoneId = zoneId self.cellOrigin = self.getCellOrigin(self.grid, self.zoneId) # Reparent our avatar to this node if not teleport: self.av.wrtReparentTo(self.cellOrigin) else: self.av.reparentTo(self.cellOrigin)
#print("gridParent: reparent to %s" % self.av) #print("gridParent: pos = %s, %s" % (self.av.getPos(), self.av.getParent().getPos()))