FGFS-4.1/OpenSceneGraph
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Added asGroup() and asTransform() methods to osg::Node to downcast nodes

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to these types without requiring an expensive dynamic_cast<>.

Also added asGeometry() to osg::Drawable for the same reasons.
This commit is contained in:
Robert Osfield
2002-09-12 15:34:31 +00:00
parent b5870857c4
commit f867dd81be
6 changed files with 33 additions and 2 deletions
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15
include/osg/Node
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@@ -17,6 +17,7 @@ namespace osg {
class NodeVisitor;
class Group;
class Transform;
/** META_Node macro define the standard clone, isSameKindAs, className
* and accept methods. Use when subclassing from Node to make it
@@ -60,6 +61,20 @@ class SG_EXPORT Node : public Object
/** return the name of the node's class type.*/
virtual const char* className() const { return "Node"; }
/** convert 'this' into a Group pointer if Node is a Group, otherwise return 0.
* Equivalent to dynamic_cast<Group*>(this).*/
virtual Group* asGroup() { return 0; }
/** convert 'const this' into a const Group pointer if Node is a Group, otherwise return 0.
* Equivalent to dynamic_cast<const Group*>(this).*/
virtual const Group* asGroup() const { return 0; }
/** convert 'this' into a Transform pointer if Node is a Transform, otherwise return 0.
* Equivalent to dynamic_cast<Transform*>(this).*/
virtual Transform* asTransform() { return 0; }
/** convert 'const this' into a const Transform pointer if Node is a Transform, otherwise return 0.
* Equivalent to dynamic_cast<const Transform*>(this).*/
virtual const Transform* asTransform() const { return 0; }
/** Visitor Pattern : calls the apply method of a NodeVisitor with this node's type.*/
virtual void accept(NodeVisitor& nv);
/** Traverse upwards : calls parents' accept method with NodeVisitor.*/