StreamlineRenderer Class Reference

Baseclass for all streamlineRenderer. More...

#include <StreamlineRenderer.h>

Inheritance diagram for StreamlineRenderer:

[legend]Collaboration diagram for StreamlineRenderer:


Public Types
enum	StreamlineMode { Regular, Interactive, EvenlySpaced }
	How seed points are placed. More...
enum	Direction { Front, Back, Both }
	The direction in which streamlines should grow. More...
Public Member Functions
	StreamlineRenderer (const Data &aData)
virtual void	render (QPixmap *pixmap)
	Render data into a provided pixmap.
void	setStreamlinePen (QPen pen)
	Sets the pen with which to draw streamlines.
void	setStreamlineMode (StreamlineMode mode)
	Sets the streamline mode.
void	clearStreamlines ()
	Remove all existing streamline points.
void	addStreamLinePoint (const Vector<> &aPoint, Direction dir)
	Adds a streamline point using world coordinates.
void	addStreamLinePoint (int x, int y, Direction dir)
	Adds a streamline point using device coordinates.
void	setDT (float dt)
	Sets dt for integration.
void	setDSep (float dsep)
	Sets dsep, the minimum distance between two streamlines.
void	setDTest (float dtest)
	Sets dtest, the fraction of dsep after which to stop growing a streamline.
Protected Member Functions
Vector	v (const Vector<> &s) const
Protected Attributes
float	mDT
Private Types
typedef std::vector< std::pair< Vector<>, Direction > >	PointList
Private Member Functions
virtual Vector	newPoint (const Vector<> &oldPoint, Direction dir) const =0
void	drawStreamline (QPainter &painter, const Vector<> &point, Direction dir)
void	streamLinePoints (const Vector<> &point, Direction dir, QVector< QPointF > &pointPairs)
	Calculates the points for a streamline starting at a point, forward or backwards.
void	markSamplePoint (const QPointF &p)
	Marks a sample point as having a streamline (used for distance calculation).
float	minDistance (const QPointF &p)
	Finds the minimum distance to other sample points.
float	minDistance (const Vector<> &v)
Private Attributes
std::vector< QPointF >	mSamplePoints
std::queue< Vector<> >	mPendingSeedPoints
QPen	mStreamlinePen
PointList	mStreamlinePoints
StreamlineMode	mMode
float	mDSep
float	mDTest

Detailed Description

Baseclass for all streamlineRenderer.

These render the specified data as streamlines, starting from seed points. The way the seed points are calculated/specified can be set using setStreamlineMode().

Member Typedef Documentation

typedef std::vector< std::pair<Vector<>, Direction> > StreamlineRenderer::PointList [private]

Member Enumeration Documentation

enum StreamlineRenderer::Direction

The direction in which streamlines should grow.

Enumerator:

Front Forward (in the direction of the flow).

Back Backwards (against the direction of the flow).

Both Both directions.

enum StreamlineRenderer::StreamlineMode

How seed points are placed.

Enumerator:

Regular Seed points are placed on a regular grid.

Interactive Seed points are specified using addStreamLinePoint().

EvenlySpaced distance to existing stream lines. See setDSep()

Constructor & Destructor Documentation

StreamlineRenderer::StreamlineRenderer ( const Data & aData )

Member Function Documentation

void StreamlineRenderer::addStreamLinePoint ( int x,

int y,

Direction dir

) [inline]

Adds a streamline point using device coordinates.

void StreamlineRenderer::addStreamLinePoint ( const Vector<> & aPoint,

Direction dir

) [inline]

Adds a streamline point using world coordinates.

void StreamlineRenderer::clearStreamlines ( ) [inline]

Remove all existing streamline points.

void StreamlineRenderer::drawStreamline ( QPainter & painter,

const Vector<> & point,

Direction dir

) [private]

void StreamlineRenderer::markSamplePoint ( const QPointF & p ) [private]

Marks a sample point as having a streamline (used for distance calculation).

float StreamlineRenderer::minDistance ( const Vector<> & v ) [inline, private]

float StreamlineRenderer::minDistance ( const QPointF & p ) [private]

Finds the minimum distance to other sample points.
Returns a large value if no other sample point exists.

virtual Vector StreamlineRenderer::newPoint ( const Vector<> & oldPoint,

Direction dir

) const [private, pure virtual]

void StreamlineRenderer::render ( QPixmap * pixmap ) [virtual]

Render data into a provided pixmap.
The size of the pixmap must be getImageSize().
Implements ARender.

void StreamlineRenderer::setDSep ( float dsep ) [inline]

Sets dsep, the minimum distance between two streamlines.

void StreamlineRenderer::setDT ( float dt ) [inline]

Sets dt for integration.

void StreamlineRenderer::setDTest ( float dtest ) [inline]

Sets dtest, the fraction of dsep after which to stop growing a streamline.

void StreamlineRenderer::setStreamlineMode ( StreamlineMode mode ) [inline]

Sets the streamline mode.
See StreamlineMode.

void StreamlineRenderer::setStreamlinePen ( QPen pen ) [inline]

Sets the pen with which to draw streamlines.
Defaults to solid black.

void StreamlineRenderer::streamLinePoints ( const Vector<> & point,

Direction dir,

QVector< QPointF > & pointPairs

) [private]

Calculates the points for a streamline starting at a point, forward or backwards.
(will return an even number of points). The points will be appended to pointPairs (i.e. it will not be cleared beforehand)