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NormVecDecorator.cc
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NormVecDecorator.cc
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/***************************************************************************
NormVecDecorator.cc - description
-------------------
copyright : (C) 2004 by Marco Hugentobler
email : mhugent@geo.unizh.ch
***************************************************************************/
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
#include "NormVecDecorator.h"
#include "qgsfeedback.h"
#include "qgslogger.h"
#include <QApplication>
NormVecDecorator::~NormVecDecorator()
{
//remove all the normals
if ( !mNormVec->isEmpty() )
{
for ( int i = 0; i < mNormVec->count(); i++ )
{
delete ( *mNormVec )[i];
}
}
delete mNormVec;
delete mPointState;
if ( mTIN )
{
delete mTIN;
}
}
int NormVecDecorator::addPoint( QgsPoint *p )
{
if ( mTIN )
{
int pointno;
pointno = mTIN->addPoint( p );
if ( pointno == -100 )//a numerical error occurred
{
// QgsDebugMsg("warning, numerical error");
return -100;
}
//recalculate the necessary normals
if ( alreadyestimated )
{
estimateFirstDerivative( pointno );
//update also the neighbours of the new point
QList<int> *list = mTIN->getSurroundingTriangles( pointno );
QList<int>::iterator it = list->begin();//iterate through the list and analize it
while ( it != list->end() )
{
int point;
point = *it;
if ( point != -1 )
{
estimateFirstDerivative( point );
}
++it;
++it;
++it;
++it;
}
delete list;
}
return pointno;
}
return -1;
}
bool NormVecDecorator::calcNormal( double x, double y, Vector3D *result )
{
if ( !alreadyestimated )
{
estimateFirstDerivatives();
alreadyestimated = true;
}
if ( mInterpolator )
{
bool b = mInterpolator->calcNormVec( x, y, result );
return b;
}
else
{
QgsDebugMsg( "warning, null pointer" );
return false;
}
}
bool NormVecDecorator::calcNormalForPoint( double x, double y, int point, Vector3D *result )
{
if ( !alreadyestimated )
{
estimateFirstDerivatives();
alreadyestimated = true;
}
if ( result )
{
int numberofbreaks = 0;//number of breaklines around the point
int ffirstbp = -1000; //numbers of the points related to the first breakline
int lfirstbp = -1000;
bool pointfound = false;//is set to true, if the triangle with the point in is found
int numberofruns = 0;//number of runs of the loop. This integer can be used to prevent endless loops
int limit = 100000;//ater this number of iterations, the method is terminated
result->setX( 0 );
result->setY( 0 );
result->setZ( 0 );
QList<int> *vlist = getSurroundingTriangles( point );//get the value list
if ( !vlist )//an error occurred in 'getSurroundingTriangles'
{
return false;
}
if ( ( ( vlist->count() ) % 4 ) != 0 ) //number of items in vlist has to be a multiple of 4
{
QgsDebugMsg( "warning, wrong number of items in vlist" );
return false;
}
QList<int>::iterator it = vlist->begin();
bool firstrun;
while ( true )//endless loop to analyze vlist
{
numberofruns++;
if ( numberofruns > limit )
{
QgsDebugMsg( "warning, a probable endless loop is detected" );
return false;
}
int p1, p2, p3, line;
firstrun = false;//flag which tells, if it is the first run with a breakline
p1 = ( *it );
++it;
p2 = ( *it );
++it;
p3 = ( *it );
++it;
line = ( *it );
if ( numberofbreaks > 0 )
{
if ( p1 != -1 && p2 != -1 && p3 != -1 )
{
if ( MathUtils::pointInsideTriangle( x, y, getPoint( p1 ), getPoint( p2 ), getPoint( p3 ) ) )
{
pointfound = true;
}
Vector3D addvec( 0, 0, 0 );
MathUtils::normalFromPoints( getPoint( p1 ), getPoint( p2 ), getPoint( p3 ), &addvec );
result->setX( result->getX() + addvec.getX() );
result->setY( result->getY() + addvec.getY() );
result->setZ( result->getZ() + addvec.getZ() );
}
}
if ( line == -10 )//we found a breakline
{
if ( numberofbreaks == 0 )//it is the first breakline
{
firstrun = true;
ffirstbp = p2;//set the marks to recognize the breakline later
lfirstbp = p3;
}
if ( p2 == ffirstbp && p3 == lfirstbp && !firstrun )//we are back at the first breakline
{
if ( !pointfound )//the point with coordinates x, y was in no triangle
{
QgsDebugMsg( "warning: point (x,y) was in no triangle" );
return false;
}
result->standardise();
break;
}
if ( numberofbreaks > 0 && pointfound )//we found the second break line and the point is between the first and the second
{
result->standardise();
numberofbreaks++;//to make the distinction between endpoints and points on a breakline easier
break;
}
result->setX( 0 );
result->setY( 0 );
result->setZ( 0 );
numberofbreaks++;
}
++it;
if ( it == vlist->end() )//restart at the beginning of the loop
{it = vlist->begin();}
}
delete vlist;
return true;
}
else
{
QgsDebugMsg( "warning, null pointer" );
return false;
}
}
bool NormVecDecorator::calcPoint( double x, double y, QgsPoint *result )
{
if ( !alreadyestimated )
{
estimateFirstDerivatives();
alreadyestimated = true;
}
if ( mInterpolator )
{
bool b = mInterpolator->calcPoint( x, y, result );
return b;
}
else
{
QgsDebugMsg( "warning, null pointer" );
return false;
}
}
bool NormVecDecorator::getTriangle( double x, double y, QgsPoint *p1, Vector3D *v1, QgsPoint *p2, Vector3D *v2, QgsPoint *p3, Vector3D *v3 )
{
if ( p1 && p2 && p3 && v1 && v2 && v3 )
{
int *nr1 = new int();
int *nr2 = new int();
int *nr3 = new int();
if ( TriDecorator::getTriangle( x, y, p1, nr1, p2, nr2, p3, nr3 ) )//everything allright
{
if ( ( *mNormVec )[( *nr1 )] && ( *mNormVec )[( *nr2 )] && ( *mNormVec )[( *nr3 )] )
{
v1->setX( ( *mNormVec )[( *nr1 )]->getX() );
v1->setY( ( *mNormVec )[( *nr1 )]->getY() );
v1->setZ( ( *mNormVec )[( *nr1 )]->getZ() );
v2->setX( ( *mNormVec )[( *nr2 )]->getX() );
v2->setY( ( *mNormVec )[( *nr2 )]->getY() );
v2->setZ( ( *mNormVec )[( *nr2 )]->getZ() );
v3->setX( ( *mNormVec )[( *nr3 )]->getX() );
v3->setY( ( *mNormVec )[( *nr3 )]->getY() );
v3->setZ( ( *mNormVec )[( *nr3 )]->getZ() );
}
else
{
QgsDebugMsg( "warning, null pointer" );
delete nr1;
delete nr2;
delete nr3;
return false;
}
delete nr1;
delete nr2;
delete nr3;
return true;
}
else
{
delete nr1;
delete nr2;
delete nr3;
return false;
}
}
else
{
QgsDebugMsg( "warning, null pointer" );
return false;
}
}
NormVecDecorator::PointState NormVecDecorator::getState( int pointno ) const
{
if ( pointno >= 0 )
{
return mPointState->at( pointno );
}
else
{
QgsDebugMsg( "warning, number below 0" );
return mPointState->at( 0 );//just to avoid a compiler warning
}
}
bool NormVecDecorator::getTriangle( double x, double y, QgsPoint *p1, int *ptn1, Vector3D *v1, PointState *state1, QgsPoint *p2, int *ptn2, Vector3D *v2, PointState *state2, QgsPoint *p3, int *ptn3, Vector3D *v3, PointState *state3 )
{
if ( p1 && p2 && p3 && v1 && v2 && v3 && ptn1 && ptn2 && ptn3 && state1 && state2 && state3 )
{
if ( TriDecorator::getTriangle( x, y, p1, ptn1, p2, ptn2, p3, ptn3 ) )//everything allright
{
v1->setX( ( *mNormVec )[( *ptn1 )]->getX() );
v1->setY( ( *mNormVec )[( *ptn1 )]->getY() );
v1->setZ( ( *mNormVec )[( *ptn1 )]->getZ() );
( *state1 ) = ( *mPointState )[( *ptn1 )];
v2->setX( ( *mNormVec )[( *ptn2 )]->getX() );
v2->setY( ( *mNormVec )[( *ptn2 )]->getY() );
v2->setZ( ( *mNormVec )[( *ptn2 )]->getZ() );
( *state2 ) = ( *mPointState )[( *ptn2 )];
v3->setX( ( *mNormVec )[( *ptn3 )]->getX() );
v3->setY( ( *mNormVec )[( *ptn3 )]->getY() );
v3->setZ( ( *mNormVec )[( *ptn3 )]->getZ() );
( *state3 ) = ( *mPointState )[( *ptn3 )];
return true;
}
else
{
return false;
}
}
else
{
QgsDebugMsg( "warning, null pointer" );
return false;
}
}
bool NormVecDecorator::estimateFirstDerivative( int pointno )
{
if ( pointno == -1 )
{
return false;
}
Vector3D part;
Vector3D total;
total.setX( 0 );
total.setY( 0 );
total.setZ( 0 );
int numberofbreaks = 0;//number of counted breaklines
double weights = 0;//sum of the weights
double currentweight = 0;//current weight
PointState status;
QList<int> *vlist = getSurroundingTriangles( pointno );//get the value list
if ( !vlist )
{
//something went wrong in getSurroundingTriangles, set the normal to (0,0,0)
if ( mNormVec->size() <= mNormVec->count() )//allocate more memory if necessary
{
QgsDebugMsg( QString( "resizing mNormVec from %1 to %2" ).arg( mNormVec->size() ).arg( mNormVec->size() + 1 ) );
mNormVec->resize( mNormVec->size() + 1 );
}
//todo:resize mNormVec if necessary
if ( !( ( *mNormVec )[pointno] ) ) //insert a pointer to a Vector3D, if there is none at this position
{
Vector3D *vec = new Vector3D( total.getX(), total.getY(), total.getZ() );
mNormVec->insert( pointno, vec );
}
else
{
( *mNormVec )[pointno]->setX( 0 );
( *mNormVec )[pointno]->setY( 0 );
( *mNormVec )[pointno]->setZ( 0 );
}
return false;
}
if ( ( vlist->count() % 4 ) != 0 ) //number of items in vlist has to be a multiple of 4
{
QgsDebugMsg( "warning, wrong number of items in vlist" );
return false;
}
QList<int>::iterator it = vlist->begin();//iterate through the list and analize it
while ( it != vlist->end() )
{
int p1, p2, p3, flag;
part.setX( 0 );
part.setY( 0 );
part.setZ( 0 );
currentweight = 0;
p1 = ( *it );
++it;
p2 = ( *it );
++it;
p3 = ( *it );
++it;
flag = ( *it );
if ( flag == -10 )//we found a breakline.
{
numberofbreaks++;
}
if ( p1 != -1 && p2 != -1 && p3 != -1 )//don't calculate normal, if a point is a virtual point
{
MathUtils::normalFromPoints( getPoint( p1 ), getPoint( p2 ), getPoint( p3 ), &part );
double dist1 = getPoint( p3 )->distance3D( *getPoint( p1 ) );
double dist2 = getPoint( p3 )->distance3D( *getPoint( p2 ) );
//don't add the normal if the triangle is horizontal
if ( ( getPoint( p1 )->z() != getPoint( p2 )->z() ) || ( getPoint( p1 )->z() != getPoint( p3 )->z() ) )
{
currentweight = 1 / ( dist1 * dist1 * dist2 * dist2 );
total.setX( total.getX() + part.getX()*currentweight );
total.setY( total.getY() + part.getY()*currentweight );
total.setZ( total.getZ() + part.getZ()*currentweight );
weights += currentweight;
}
}
++it;
}
if ( total.getX() == 0 && total.getY() == 0 && total.getZ() == 0 )//we have a point surrounded by horizontal triangles
{
total.setZ( 1 );
}
else
{
total.setX( total.getX() / weights );
total.setY( total.getY() / weights );
total.setZ( total.getZ() / weights );
total.standardise();
}
if ( numberofbreaks == 0 )
{
status = Normal;
}
else if ( numberofbreaks == 1 )
{
status = EndPoint;
}
else
{
status = BreakLine;
}
delete vlist;
//insert the new calculated vector
if ( mNormVec->size() <= mNormVec->count() )//allocate more memory if necessary
{
mNormVec->resize( mNormVec->size() + 1 );
}
if ( !( ( *mNormVec )[pointno] ) ) //insert a pointer to a Vector3D, if there is none at this position
{
Vector3D *vec = new Vector3D( total.getX(), total.getY(), total.getZ() );
mNormVec->insert( pointno, vec );
}
else
{
( *mNormVec )[pointno]->setX( total.getX() );
( *mNormVec )[pointno]->setY( total.getY() );
( *mNormVec )[pointno]->setZ( total.getZ() );
}
//insert the new status
if ( pointno >= mPointState->size() )
{
mPointState->resize( mPointState->size() + 1 );
}
( *mPointState )[pointno] = status;
return true;
}
//weighted method of little
bool NormVecDecorator::estimateFirstDerivatives( QgsFeedback *feedback )
{
int numberPoints = getNumberOfPoints();
for ( int i = 0; i < numberPoints; i++ )
{
if ( feedback )
{
feedback->setProgress( 100.0 * static_cast< double >( i ) / numberPoints );
}
estimateFirstDerivative( i );
}
return true;
}
void NormVecDecorator::eliminateHorizontalTriangles()
{
if ( mTIN )
{
if ( alreadyestimated )
{
mTIN->eliminateHorizontalTriangles();
estimateFirstDerivatives();
}
else
{
mTIN->eliminateHorizontalTriangles();
}
}
else
{
QgsDebugMsg( "warning, null pointer" );
}
}
void NormVecDecorator::setState( int pointno, PointState s )
{
if ( pointno >= 0 )
{
( *mPointState )[pointno] = s;
}
else
{
QgsDebugMsg( "warning, pointno>0" );
}
}
bool NormVecDecorator::swapEdge( double x, double y )
{
if ( mTIN )
{
bool b = false;
if ( alreadyestimated )
{
QList<int> *list = getPointsAroundEdge( x, y );
if ( list )
{
b = mTIN->swapEdge( x, y );
QList<int>::iterator it;
for ( it = list->begin(); it != list->end(); ++it )
{
estimateFirstDerivative( ( *it ) );
}
delete list;
}
}
else
{
b = mTIN->swapEdge( x, y );
}
return b;
}
else
{
QgsDebugMsg( "warning, null pointer" );
return false;
}
}
bool NormVecDecorator::saveAsShapefile( const QString &fileName ) const
{
if ( !mTIN )
{
return false;
}
return mTIN->saveAsShapefile( fileName );
}