Polygon::Segment_Iterator Class Reference

Iterator over the edges (segments) of a polygon. More...

#include <polygon.H>

Inheritance diagram for Polygon::Segment_Iterator:

Collaboration diagram for Polygon::Segment_Iterator:

Public Member Functions
	Segment_Iterator (const Polygon &__poly)
	Construct segment iterator from a polygon.
bool	has_curr () const
	Check if there is a current segment.
Segment	get_current_segment () const
	Get the current segment (edge).

Private Attributes
Polygon &	poly
	Reference to the polygon being iterated.

Detailed Description

Iterator over the edges (segments) of a polygon.

Provides sequential access to all edges of the polygon. For a closed polygon, this includes the edge from the last vertex back to the first.

for (Polygon::Segment_Iterator it(poly); it.has_curr(); it.next())
{
  Segment edge = it.get_current_segment();
  std::cout << "Edge: " << edge.to_string() << "\n";
}

Definition at line 450 of file polygon.H.

Constructor & Destructor Documentation

Segment_Iterator()

Polygon::Segment_Iterator::Segment_Iterator ( const Polygon &  __poly )

inline

Construct segment iterator from a polygon.

Parameters

__poly

The polygon to iterate over.

Exceptions

std::domain_error

If the polygon has fewer than 2 vertices.

Definition at line 458 of file polygon.H.

References ah_domain_error_if, Aleph::Dlink::is_unitarian_or_empty(), poly, and Polygon::vertex_list.

Member Function Documentation

get_current_segment()

Segment Polygon::Segment_Iterator::get_current_segment ( ) const

inline

Get the current segment (edge).

Returns

The segment from current vertex to the next.

Exceptions

std::domain_error

If at last vertex of an open polygon.

Definition at line 479 of file polygon.H.

References ah_domain_error_if, Vertex::dlink_to_vertex(), Aleph::get_curr(), Polygon::get_first_vertex(), Polygon::is_closed(), Aleph::maps(), Vertex::next_vertex(), and poly.

Referenced by Polygon::close(), Polygon::contains_to(), and TEST_F().

has_curr()

bool Polygon::Segment_Iterator::has_curr ( ) const

inline

Check if there is a current segment.

Returns

True if a current segment exists.

Note

For open polygons, returns false when at the last vertex.

Definition at line 468 of file polygon.H.

References Aleph::Dlink::Iterator::has_curr(), Polygon::is_closed(), Aleph::maps(), and poly.

Referenced by Polygon::contains_to(), demo_coverage_area(), Aleph::CuttingEarsTriangulation::diagonalie(), Polygon::intersects_with(), TEST_F(), and TEST_F().

Member Data Documentation

poly

Polygon& Polygon::Segment_Iterator::poly

private

Reference to the polygon being iterated.

Definition at line 452 of file polygon.H.

Referenced by Segment_Iterator(), get_current_segment(), and has_curr().

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The documentation for this class was generated from the following file:

• polygon.H