From 575bb997f52f1cab882546d82d0c76e88e84d1b5 Mon Sep 17 00:00:00 2001
From: Dave Schuyler <nthparameter@gmail.com>
Date: Wed, 8 Oct 2003 00:40:16 +0000
Subject: [PATCH] *** empty log message ***

---
 direct/src/showbase/ShadowPlacer.py | 91 +++++++++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 direct/src/showbase/ShadowPlacer.py

diff --git a/direct/src/showbase/ShadowPlacer.py b/direct/src/showbase/ShadowPlacer.py
new file mode 100755
index 0000000000..65778db02d
--- /dev/null
+++ b/direct/src/showbase/ShadowPlacer.py
@@ -0,0 +1,91 @@
+"""
+ShadowPlacer.py places a shadow.
+
+It traces a line from a light source to the opposing surface.
+Or it may do that later, right now it puts a node on the surface under
+the its parent node.
+"""
+
+from ShowBaseGlobal import *
+
+import DirectNotifyGlobal
+import DirectObject
+
+class ShadowPlacer(DirectObject.DirectObject):
+    notify = DirectNotifyGlobal.directNotify.newCategory("ShadowPlacer")
+
+    # special methods
+    def __init__(self, cTrav, shadowNodePath, 
+            wallCollideMask, floorCollideMask):
+        DirectObject.DirectObject.__init__(self)
+        self.setup(cTrav, shadowNodePath, 
+            wallCollideMask, floorCollideMask)
+
+    def setup(self, cTrav, shadowNodePath, 
+            wallCollideMask, floorCollideMask):
+        """
+        Set up the collisions
+        """
+        assert not shadowNodePath.isEmpty()
+        
+        self.cTrav = cTrav
+        self.shadowNodePath = shadowNodePath
+
+        floorOffset = 0.025
+        # Set up the collison ray
+        # This is a ray cast from floorOffset down to detect floor polygons
+        self.cRay = CollisionRay(0.0, 0.0, 4.0, 0.0, 0.0, -1.0)
+        self.cRayNode = CollisionNode('shadowPlacer')
+        self.cRayNode.addSolid(self.cRay)
+        self.cRayNodePath = shadowNodePath.attachNewNode(self.cRayNode)
+        self.cRayBitMask = floorCollideMask
+        self.cRayNode.setFromCollideMask(self.cRayBitMask)
+        self.cRayNode.setIntoCollideMask(BitMask32.allOff())
+
+        # set up floor collision mechanism
+        self.lifter = CollisionHandlerFloor()
+        #self.lifter.setInPattern("on-floor")
+        #self.lifter.setOutPattern("off-floor")
+        self.lifter.setOffset(floorOffset)
+
+        # activate the collider with the traverser and pusher
+        self.on()
+        
+        self.lifter.addColliderNode(self.cRayNode, shadowNodePath.node())
+
+    def delete(self):
+        del self.cTrav
+
+        del self.shadowNodePath
+
+        del self.cRay
+        del self.cRayNode
+        self.cRayNodePath.removeNode()
+        del self.cRayNodePath
+
+        del self.lifter
+
+    def off(self):
+        self.cTrav.removeCollider(self.cRayNode)
+        # Now that we have disabled collisions, make one more pass
+        # right now to ensure we aren't standing in a wall.
+        self.oneTimeCollide()
+
+    def on(self):
+        self.cTrav.addCollider(self.cRayNode, self.lifter)
+
+    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()
+        tempCTrav.addCollider(self.cRayNode, self.lifter)
+        tempCTrav.traverse(render)
+    
+    if __debug__:
+        def debugPrint(self, message):
+            """for debugging"""
+            return self.notify.debug(
+                    str(id(self))+' '+message)