Bottom-Left Placement Heuristic. More...

#include <rplacementbottomleft.h>

Inheritance diagram for RPlacementBottomLeft:
Collaboration diagram for RPlacementBottomLeft:

Public Member Functions

 RPlacementBottomLeft (size_t maxobjs, bool calc, bool use, RRandom &r, RParamStruct *dist, RParamStruct *area, bool firstrandom, bool ori)
virtual void Init (RProblem2D *prob, RLayout *layout, RGrid *grid)
virtual void SearchValidPositions (RGeoInfo *info)
virtual void PostPlace (RGeoInfo *info, const RPoint &pos)
- Public Member Functions inherited from RPlacementHeuristic
 RPlacementHeuristic (size_t maxobjs, bool calc, bool use, RRandom &r, RParamStruct *dist, RParamStruct *area, bool firstrandom, bool ori)
RGeoInfoNextObject (void)
void Run (RProblem2D *prob, RLayout *layout, RGrid *grid)
void AddValidPosition (RPoint &pos)
virtual void PostRun (void)
RRect GetResult (void)
double GetDistances (void)
bool IsEnd (void)
size_t GetNbObjsOk (void)
RFreePolygonsGetFreePolygons (void)
RLayoutGetLayout (void) const
virtual ~RPlacementHeuristic (void)

Private Attributes

RPoint NextObj
RPoint NextLine

Additional Inherited Members

- Protected Member Functions inherited from RPlacementHeuristic
virtual RGeoInfoSelectNextObject (void)
- Protected Attributes inherited from RPlacementHeuristic
RSize Limits
bool WeightedDistances
size_t NbObjs
size_t NbObjsOk
RRect Result
double Distances
RGeoInfo ** Order
RFreePolygons Free
bool CalcFree
bool UseFree
bool AllOri
RContainer< ObjectPos, true,
false > 
RPromKernel Prom
const RParamDistParams
const RParamAreaParams
bool FirstRandom

Detailed Description

Bottom-Left Placement Heuristic.

This class implements a bottom-left heuristic. This heuristic handles objects "line after line". The first object is place in bottom-left part of the rectangle representing the limits. After that, the heuristic try to place so much objects as possible to the right of the first object. When it is not more possible, the next object is place top of the first one. The heuristic try then to put the rest of the objects to the right and so on.

Constructor & Destructor Documentation

RPlacementBottomLeft ( size_t  maxobjs,
bool  calc,
bool  use,
RRandom r,
RParamStruct dist,
RParamStruct area,
bool  firstrandom,
bool  ori 

Construct the bottom-left heuristic.

maxobjsMaximal number of objects to place.
calcMust free polygons be calculated.
useMust free polygons be used.
rThe random generator to use.
distDistance criteria parameters.
areaArea criteria parameters.
firstrandomMust the first object be placed randomly?
oriMust all orientation be tested.

Member Function Documentation

virtual void Init ( RProblem2D prob,
RLayout layout,
RGrid grid 

Initialize the heuristic.

probThe problem.

Reimplemented from RPlacementHeuristic.

virtual void SearchValidPositions ( RGeoInfo info)

Calculate all the possible positions to place a given object. The method must register these valid positions with the 'AddValidPosition' method.

infoGeometric information representing the object placed.

Implements RPlacementHeuristic.

virtual void PostPlace ( RGeoInfo info,
const RPoint pos 

This method is called each time a given object is placed at a given position. It can be used to make some specific computational updates.

This method must update Result, the rectangle bounding all placed objects.

infoGeometric information representing the object placed.
posThe position where it is placed.

Implements RPlacementHeuristic.

Member Data Documentation

RPoint NextObj

Position where to place the next object.

RPoint NextLine

Where the next line begin.