GEOS
3.9.1
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#include <OverlayLabel.h>
Public Types | |
enum | { DIM_UNKNOWN = -1 , DIM_NOT_PART = -1 , DIM_LINE = 1 , DIM_BOUNDARY = 2 , DIM_COLLAPSE = 3 } |
Public Member Functions | |
OverlayLabel (int p_index) | |
OverlayLabel (int p_index, Location p_locLeft, Location p_locRight, bool p_isHole) | |
int | dimension (int index) const |
void | initBoundary (int index, Location locLeft, Location locRight, bool p_isHole) |
void | initCollapse (int index, bool p_isHole) |
void | initLine (int index) |
void | initNotPart (int index) |
void | setLocationLine (int index, Location loc) |
void | setLocationAll (int index, Location loc) |
void | setLocationCollapse (int index) |
bool | isLine () const |
bool | isLine (int index) const |
bool | isLinear (int index) const |
bool | isKnown (int index) const |
bool | isNotPart (int index) const |
bool | isBoundaryEither () const |
bool | isBoundaryBoth () const |
bool | isBoundaryCollapse () const |
bool | isBoundaryTouch () const |
bool | isBoundary (int index) const |
bool | isLineLocationUnknown (int index) const |
bool | isBoundarySingleton () const |
bool | isLineInArea (int index) const |
bool | isHole (int index) const |
bool | isCollapse (int index) const |
Location | getLineLocation (int index) const |
bool | isInteriorCollapse () const |
bool | isCollapseAndNotPartInterior () const |
bool | isLineInterior (int index) const |
Location | getLocationBoundaryOrLine (int index, int position, bool isForward) const |
Location | getLocation (int index) const |
Location | getLocation (int index, int position, bool isForward) const |
bool | hasSides (int index) const |
OverlayLabel | copy () const |
void | toString (bool isForward, std::ostream &os) const |
Static Public Attributes | |
static constexpr Location | LOC_UNKNOWN = Location::NONE |
Friends | |
std::ostream & | operator<< (std::ostream &os, const OverlayLabel &ol) |
A label for a pair of OverlayEdges which records the topological information for the edge in the OverlayGraph containing it. The label is shared between both OverlayEdges of a symmetric pair. Accessors for orientation-sensitive information require the orientation of the containing OverlayEdge.
A label contains the topological geom::Locations for the two overlay input geometries. A labelled input geometry may be either a Line or an Area. In both cases, the label locations are populated with the locations for the edge geom::Positions once they are computed by topological evaluation. The label also records the dimension of each geometry, and in the case of area boundary edges, the role of the originating ring (which allows determination of the edge role in collapse cases).
For each input geometry, the label indicates that an edge is in one of the following states (identified by the "dim" field). Each state has some additional information about the edge.
Note that:
Location geos::operation::overlayng::OverlayLabel::getLocation | ( | int | index | ) | const |
Gets the linear location for the given source.
index | the source index |
Location geos::operation::overlayng::OverlayLabel::getLocationBoundaryOrLine | ( | int | index, |
int | position, | ||
bool | isForward | ||
) | const |
Gets the location for this label for either a Boundary or a Line edge. This supports a simple determination of whether the edge should be included as a result edge.
index | the source index |
position | the position for a boundary label |
isForward | the direction for a boundary label |
bool geos::operation::overlayng::OverlayLabel::isBoundaryCollapse | ( | ) | const |
Tests if the label is for a collapsed edge of an area which is coincident with the boundary of the other area.
bool geos::operation::overlayng::OverlayLabel::isBoundarySingleton | ( | ) | const |
Tests whether a label is for an edge which is a boundary of one geometry and not part of the other.
bool geos::operation::overlayng::OverlayLabel::isBoundaryTouch | ( | ) | const |
Tests if a label is for an edge where two area touch along their boundary.
bool geos::operation::overlayng::OverlayLabel::isCollapseAndNotPartInterior | ( | ) | const |
Tests if a label is a Collapse and NotPart with location INTERIOR for the other geometry.
bool geos::operation::overlayng::OverlayLabel::isInteriorCollapse | ( | ) | const |
Tests if a label is a Collapse has location INTERIOR, to at least one source geometry.
bool geos::operation::overlayng::OverlayLabel::isLineInArea | ( | int | index | ) | const |
Tests if a line edge is inside
index |
bool geos::operation::overlayng::OverlayLabel::isLineInterior | ( | int | index | ) | const |
Tests if a line is in the interior of a source geometry.
index | source geometry |
void geos::operation::overlayng::OverlayLabel::setLocationLine | ( | int | index, |
Location | loc | ||
) |
Sets the line location.
This is used to set the locations for linear edges encountered during area label propagation.
index | source to update |
loc | location to set |