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qwt_raster_data.cpp
/******************************************************************************
* Qwt Widget Library
* Copyright (C) 1997 Josef Wilgen
* Copyright (C) 2002 Uwe Rathmann
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the Qwt License, Version 1.0
*****************************************************************************/
#include "qwt_raster_data.h"
#include "qwt_point_3d.h"
#include "qwt_interval.h"
#include <qrect.h>
#include <qpolygon.h>
#include <qnumeric.h>
#include <qlist.h>
#include <qmap.h>
class QwtRasterData::ContourPlane
{
public:
explicit inline ContourPlane( double z ):
m_z( z )
{
}
inline bool intersect( const QwtPoint3D vertex[3],
QPointF line[2], bool ignoreOnPlane ) const;
inline double z() const { return m_z; }
private:
inline int compare( double z ) const;
inline QPointF intersection(
const QwtPoint3D& p1, const QwtPoint3D& p2 ) const;
double m_z;
};
inline bool QwtRasterData::ContourPlane::intersect(
const QwtPoint3D vertex[3], QPointF line[2],
bool ignoreOnPlane ) const
{
bool found = true;
// Are the vertices below (-1), on (0) or above (1) the plan ?
const int eq1 = compare( vertex[0].z() );
const int eq2 = compare( vertex[1].z() );
const int eq3 = compare( vertex[2].z() );
/*
(a) All the vertices lie below the contour level.
(b) Two vertices lie below and one on the contour level.
(c) Two vertices lie below and one above the contour level.
(d) One vertex lies below and two on the contour level.
(e) One vertex lies below, one on and one above the contour level.
(f) One vertex lies below and two above the contour level.
(g) Three vertices lie on the contour level.
(h) Two vertices lie on and one above the contour level.
(i) One vertex lies on and two above the contour level.
(j) All the vertices lie above the contour level.
*/
static const int tab[3][3][3] =
{
// jump table to avoid nested case statements
{ { 0, 0, 8 }, { 0, 2, 5 }, { 7, 6, 9 } },
{ { 0, 3, 4 }, { 1, 10, 1 }, { 4, 3, 0 } },
{ { 9, 6, 7 }, { 5, 2, 0 }, { 8, 0, 0 } }
};
const int edgeType = tab[eq1 + 1][eq2 + 1][eq3 + 1];
switch ( edgeType )
{
case 1:
// d(0,0,-1), h(0,0,1)
line[0] = vertex[0].toPoint();
line[1] = vertex[1].toPoint();
break;
case 2:
// d(-1,0,0), h(1,0,0)
line[0] = vertex[1].toPoint();
line[1] = vertex[2].toPoint();
break;
case 3:
// d(0,-1,0), h(0,1,0)
line[0] = vertex[2].toPoint();
line[1] = vertex[0].toPoint();
break;
case 4:
// e(0,-1,1), e(0,1,-1)
line[0] = vertex[0].toPoint();
line[1] = intersection( vertex[1], vertex[2] );
break;
case 5:
// e(-1,0,1), e(1,0,-1)
line[0] = vertex[1].toPoint();
line[1] = intersection( vertex[2], vertex[0] );
break;
case 6:
// e(-1,1,0), e(1,0,-1)
line[0] = vertex[2].toPoint();
line[1] = intersection( vertex[0], vertex[1] );
break;
case 7:
// c(-1,1,-1), f(1,1,-1)
line[0] = intersection( vertex[0], vertex[1] );
line[1] = intersection( vertex[1], vertex[2] );
break;
case 8:
// c(-1,-1,1), f(1,1,-1)
line[0] = intersection( vertex[1], vertex[2] );
line[1] = intersection( vertex[2], vertex[0] );
break;
case 9:
// f(-1,1,1), c(1,-1,-1)
line[0] = intersection( vertex[2], vertex[0] );
line[1] = intersection( vertex[0], vertex[1] );
break;
case 10:
// g(0,0,0)
// The CONREC algorithm has no satisfying solution for
// what to do, when all vertices are on the plane.
if ( ignoreOnPlane )
found = false;
else
{
line[0] = vertex[2].toPoint();
line[1] = vertex[0].toPoint();
}
break;
default:
found = false;
}
return found;
}
inline int QwtRasterData::ContourPlane::compare( double z ) const
{
if ( z > m_z )
return 1;
if ( z < m_z )
return -1;
return 0;
}
inline QPointF QwtRasterData::ContourPlane::intersection(
const QwtPoint3D& p1, const QwtPoint3D& p2 ) const
{
const double h1 = p1.z() - m_z;
const double h2 = p2.z() - m_z;
const double x = ( h2 * p1.x() - h1 * p2.x() ) / ( h2 - h1 );
const double y = ( h2 * p1.y() - h1 * p2.y() ) / ( h2 - h1 );
return QPointF( x, y );
}
class QwtRasterData::PrivateData
{
public:
QwtRasterData::Attributes attributes;
};
QwtRasterData::QwtRasterData()
{
m_data = new PrivateData();
}
QwtRasterData::~QwtRasterData()
{
delete m_data;
}
void QwtRasterData::setAttribute( Attribute attribute, bool on )
{
if ( on )
m_data->attributes |= attribute;
else
m_data->attributes &= ~attribute;
}
bool QwtRasterData::testAttribute( Attribute attribute ) const
{
return m_data->attributes & attribute;
}
void QwtRasterData::initRaster( const QRectF& area, const QSize& raster )
{
Q_UNUSED( area );
Q_UNUSED( raster );
}
void QwtRasterData::discardRaster()
{
}
QRectF QwtRasterData::pixelHint( const QRectF& area ) const
{
Q_UNUSED( area );
return QRectF();
}
QwtRasterData::ContourLines QwtRasterData::contourLines(
const QRectF& rect, const QSize& raster,
const QList< double >& levels, ConrecFlags flags ) const
{
ContourLines contourLines;
if ( levels.size() == 0 || !rect.isValid() || !raster.isValid() )
return contourLines;
const double dx = rect.width() / raster.width();
const double dy = rect.height() / raster.height();
const bool ignoreOnPlane =
flags & QwtRasterData::IgnoreAllVerticesOnLevel;
const QwtInterval range = interval( Qt::ZAxis );
bool ignoreOutOfRange = false;
if ( range.isValid() )
ignoreOutOfRange = flags & IgnoreOutOfRange;
QwtRasterData* that = const_cast< QwtRasterData* >( this );
that->initRaster( rect, raster );
for ( int y = 0; y < raster.height() - 1; y++ )
{
enum Position
{
Center,
TopLeft,
TopRight,
BottomRight,
BottomLeft,
NumPositions
};
QwtPoint3D xy[NumPositions];
for ( int x = 0; x < raster.width() - 1; x++ )
{
const QPointF pos( rect.x() + x * dx, rect.y() + y * dy );
if ( x == 0 )
{
xy[TopRight].setX( pos.x() );
xy[TopRight].setY( pos.y() );
xy[TopRight].setZ(
value( xy[TopRight].x(), xy[TopRight].y() )
);
xy[BottomRight].setX( pos.x() );
xy[BottomRight].setY( pos.y() + dy );
xy[BottomRight].setZ(
value( xy[BottomRight].x(), xy[BottomRight].y() )
);
}
xy[TopLeft] = xy[TopRight];
xy[BottomLeft] = xy[BottomRight];
xy[TopRight].setX( pos.x() + dx );
xy[TopRight].setY( pos.y() );
xy[BottomRight].setX( pos.x() + dx );
xy[BottomRight].setY( pos.y() + dy );
xy[TopRight].setZ(
value( xy[TopRight].x(), xy[TopRight].y() )
);
xy[BottomRight].setZ(
value( xy[BottomRight].x(), xy[BottomRight].y() )
);
double zMin = xy[TopLeft].z();
double zMax = zMin;
double zSum = zMin;
for ( int i = TopRight; i <= BottomLeft; i++ )
{
const double z = xy[i].z();
zSum += z;
if ( z < zMin )
zMin = z;
if ( z > zMax )
zMax = z;
}
if ( qIsNaN( zSum ) )
{
// one of the points is NaN
continue;
}
if ( ignoreOutOfRange )
{
if ( !range.contains( zMin ) || !range.contains( zMax ) )
continue;
}
if ( zMax < levels[0] ||
zMin > levels[levels.size() - 1] )
{
continue;
}
xy[Center].setX( pos.x() + 0.5 * dx );
xy[Center].setY( pos.y() + 0.5 * dy );
xy[Center].setZ( 0.25 * zSum );
const int numLevels = levels.size();
for ( int l = 0; l < numLevels; l++ )
{
const double level = levels[l];
if ( level < zMin || level > zMax )
continue;
QPolygonF& lines = contourLines[level];
const ContourPlane plane( level );
QPointF line[2];
QwtPoint3D vertex[3];
for ( int m = TopLeft; m < NumPositions; m++ )
{
vertex[0] = xy[m];
vertex[1] = xy[0];
vertex[2] = xy[m != BottomLeft ? m + 1 : TopLeft];
const bool intersects =
plane.intersect( vertex, line, ignoreOnPlane );
if ( intersects )
{
lines += line[0];
lines += line[1];
}
}
}
}
}
that->discardRaster();
return contourLines;
}
QList< double >
QMap
Definition qwt_compass.h:19
QwtInterval
A class representing an interval.
Definition qwt_interval.h:23
QwtInterval::isValid
bool isValid() const
Definition qwt_interval.h:210
QwtInterval::contains
bool contains(double value) const
Definition qwt_interval.cpp:67
QwtPoint3D
QwtPoint3D class defines a 3D point in double coordinates.
Definition qwt_point_3d.h:23
QwtPoint3D::z
double z() const
Definition qwt_point_3d.h:115
QwtPoint3D::y
double y() const
Definition qwt_point_3d.h:109
QwtPoint3D::setY
void setY(double y)
Sets the y-coordinate of the point to the value specified by y.
Definition qwt_point_3d.h:145
QwtPoint3D::x
double x() const
Definition qwt_point_3d.h:103
QwtPoint3D::setZ
void setZ(double y)
Sets the z-coordinate of the point to the value specified by z.
Definition qwt_point_3d.h:151
QwtPoint3D::toPoint
QPointF toPoint() const
Definition qwt_point_3d.h:159
QwtPoint3D::setX
void setX(double x)
Sets the x-coordinate of the point to the value specified by x.
Definition qwt_point_3d.h:139
QwtRasterData
QwtRasterData defines an interface to any type of raster data.
Definition qwt_raster_data.h:43
QwtRasterData::pixelHint
virtual QRectF pixelHint(const QRectF &) const
Pixel hint.
Definition qwt_raster_data.cpp:267
QwtRasterData::testAttribute
bool testAttribute(Attribute) const
Definition qwt_raster_data.cpp:201
QwtRasterData::QwtRasterData
QwtRasterData()
Constructor.
Definition qwt_raster_data.cpp:171
QwtRasterData::ConrecFlags
QFlags< ConrecFlag > ConrecFlags
Definition qwt_raster_data.h:86
QwtRasterData::discardRaster
virtual void discardRaster()
Discard a raster.
Definition qwt_raster_data.cpp:237
QwtRasterData::value
virtual double value(double x, double y) const =0
QwtRasterData::initRaster
virtual void initRaster(const QRectF &, const QSize &raster)
Initialize a raster.
Definition qwt_raster_data.cpp:221
QwtRasterData::Attributes
QFlags< Attribute > Attributes
Definition qwt_raster_data.h:74
QwtRasterData::contourLines
virtual ContourLines contourLines(const QRectF &rect, const QSize &raster, const QList< double > &levels, ConrecFlags) const
Definition qwt_raster_data.cpp:286
QwtRasterData::~QwtRasterData
virtual ~QwtRasterData()
Destructor.
Definition qwt_raster_data.cpp:177
QwtRasterData::setAttribute
void setAttribute(Attribute, bool on=true)
Definition qwt_raster_data.cpp:189
QwtRasterData::Attribute
Attribute
Raster data attributes.
Definition qwt_raster_data.h:55
QwtRasterData::interval
virtual QwtInterval interval(Qt::Axis) const =0
QwtRasterData::IgnoreOutOfRange
@ IgnoreOutOfRange
Ignore all values, that are out of range.
Definition qwt_raster_data.h:83
QwtRasterData::IgnoreAllVerticesOnLevel
@ IgnoreAllVerticesOnLevel
Ignore all vertices on the same level.
Definition qwt_raster_data.h:80