Open CASCADE Technology 6.6.0
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An Explorer is a Tool to visit a Topological Data
Structure form the TopoDS package.
An Explorer is built with :
* The Shape to explore.
* The type of Shapes to find : e.g VERTEX, EDGE.
This type cannot be SHAPE.
* The type of Shapes to avoid. e.g SHELL, EDGE.
By default this type is SHAPE which means no
restriction on the exploration.
The Explorer visits all the structure to find
shapes of the requested type which are not
contained in the type to avoid.
Example to find all the Faces in the Shape S :
TopExp_Explorer Ex;
for (Ex.Init(S,TopAbs_FACE); Ex.More(); Ex.Next()) {
ProcessFace(Ex.Current());
}
// an other way
TopExp_Explorer Ex(S,TopAbs_FACE);
while (Ex.More()) {
ProcessFace(Ex.Current());
Ex.Next();
}
To find all the vertices which are not in an edge :
for (Ex.Init(S,TopAbs_VERTEX,TopAbs_EDGE); ...)
To find all the faces in a SHELL, then all the
faces not in a SHELL :
TopExp_Explorer Ex1, Ex2;
for (Ex1.Init(S,TopAbs_SHELL),...) {
// visit all shells
for (Ex2.Init(Ex1.Current(),TopAbs_FACE),...) {
// visit all the faces of the current shell
}
}
for (Ex1.Init(S,TopAbs_FACE,TopAbs_SHELL),...) {
// visit all faces not in a shell
}
If the type to avoid is the same or is less
complex than the type to find it has no effect.
For example searching edges not in a vertex does
not make a difference.
#include <TopExp_Explorer.hxx>
Public Member Functions | |
TopExp_Explorer () | |
Creates an empty explorer, becomes usefull after Init. | |
TopExp_Explorer (const TopoDS_Shape &S, const TopAbs_ShapeEnum ToFind, const TopAbs_ShapeEnum ToAvoid=TopAbs_SHAPE) | |
Creates an Explorer on the Shape <S>. <ToFind> is the type of shapes to search. TopAbs_VERTEX, TopAbs_EDGE, ... <ToAvoid> is the type of shape to skip in the exploration. If <ToAvoid> is equal or less complex than <ToFind> or if <ToAVoid> is SHAPE it has no effect on the exploration. | |
void | Init (const TopoDS_Shape &S, const TopAbs_ShapeEnum ToFind, const TopAbs_ShapeEnum ToAvoid=TopAbs_SHAPE) |
Resets this explorer on the shape S. It is initialized to search the shape S, for shapes of type ToFind, that are not part of a shape ToAvoid. If the shape ToAvoid is equal to TopAbs_SHAPE, or if it is the same as, or less complex than, the shape ToFind it has no effect on the search. | |
Standard_Boolean | More () const |
Returns True if there are more shapes in the exploration. | |
void | Next () |
Moves to the next Shape in the exploration. Exceptions Standard_NoMoreObject if there are no more shapes to explore. | |
const TopoDS_Shape & | Current () const |
Returns the current shape in the exploration. Exceptions Standard_NoSuchObject if this explorer has no more shapes to explore. | |
void | ReInit () |
Reinitialize the exploration with the original arguments. | |
Standard_Integer | Depth () const |
Returns the current depth of the exploration. 0 is the shape to explore itself. | |
void | Clear () |
Clears the content of the explorer. It will return False on More(). | |
void | Destroy () |
~TopExp_Explorer () |
TopExp_Explorer::TopExp_Explorer | ( | ) |
TopExp_Explorer::TopExp_Explorer | ( | const TopoDS_Shape & | S, |
const TopAbs_ShapeEnum | ToFind, | ||
const TopAbs_ShapeEnum | ToAvoid = TopAbs_SHAPE |
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) |
TopExp_Explorer::~TopExp_Explorer | ( | ) | [inline] |
void TopExp_Explorer::Clear | ( | ) |
const TopoDS_Shape& TopExp_Explorer::Current | ( | ) | const |
Standard_Integer TopExp_Explorer::Depth | ( | ) | const |
void TopExp_Explorer::Destroy | ( | ) |
void TopExp_Explorer::Init | ( | const TopoDS_Shape & | S, |
const TopAbs_ShapeEnum | ToFind, | ||
const TopAbs_ShapeEnum | ToAvoid = TopAbs_SHAPE |
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) |
Standard_Boolean TopExp_Explorer::More | ( | ) | const |
void TopExp_Explorer::Next | ( | ) |
void TopExp_Explorer::ReInit | ( | ) |