FlowGeometry Class Reference

class for handling the geometry == rectangular grids organized in vertices and cells More...

#include <FlowGeometry.h>

Collaboration diagram for FlowGeometry:

[legend]

List of all members.

Public Member Functions
	FlowGeometry ()
	~FlowGeometry ()
	deletes the allocated geometry storage
bool	getInterpolationAt (vec3 pos, int *vtxID, float *coef)
	Returns true if inside. Stores the vertex indices and interpolation weights for the given position in the arrays.
bool	readFromFile (char *header, FILE *fp, bool bigEndian)
	reads the geometry gris data from a file
int	getDimX ()
	returns the number of vertices in X dimension
int	getDimY ()
	returns the number of vertices in Y dimension
int	getDimZ ()
	returns the number of vertices in Z dimension, is always 1
float	getMinX ()
	returns the minimum in the X dimension
float	getMaxX ()
	returns the maximum in the X dimension
float	getMinY ()
	returns the minimum in the Y dimension
float	getMaxY ()
	returns the maximum in the Y dimension
int	getRightNeigh (int vtxID)
	returns the vertex ID of the neighbour on its right
int	getTopNeigh (int vtxID)
	returns the vertex ID of the neighbour on its top
int	getLeftNeigh (int vtxID)
	returns the vertex ID of the neighbour on its left
int	getBottomNeigh (int vtxID)
	returns the vertex ID of the neighbour on its bottom
vec3	normalizeCoords (vec3 pos)
	compression of coordinates in each dimension separately, returns values scaled to <0,1>
vec3	unNormalizeCoords (vec3 pos)
	inverts the compression. From values of <0,1> it restores the real geometrical coordinates
Private Member Functions
int	getVtx (int x, int y)
	returns general vtxID for the vertex array indexes
int	getVtxX (int vtxID)
	returns X index for the general vtxID
int	getVtxY (int vtxID)
	returns Y index for the general vtxID
int	getXYvtx (vec3 pos)
	returns X index of the last vertex lying left to the position x and the Y index of the last vertex lying under the position y
vec3	getPos (int vtxID)
	returns the position of the vertex
float	getPosX (int vtxID)
	returns the x position of the vertex
float	getPosY (int vtxID)
	returns the y position of the vertex
int	getNearestVtx (vec3 pos)
	a very slow and dumb routine, that finds the nearest vertex to the given position
Private Attributes
int	dim [2]
	resolution of the data for the dimensions X, Y
vec3	boundaryMin
	minimum boundary values for the dataset geometry sotred as {minX, minY)
vec3	boundaryMax
	maximum boundary values for the dataset geometry sotred as (maxX, maxY)
vec3	boundarySize
	boundary sizes for the dataset geometry sotred as (maX - minX, maxY - minY)
vec3 *	geometryData
	Storage for the geometry.
bool	isFlipped
	indicates whether the x and y axes have to be swaped
int	counter
Friends
class	FlowData

---

Detailed Description

class for handling the geometry == rectangular grids organized in vertices and cells

---

Constructor & Destructor Documentation

FlowGeometry::FlowGeometry

(

)

FlowGeometry::~FlowGeometry

(

)

deletes the allocated geometry storage

---

Member Function Documentation

int FlowGeometry::getBottomNeigh

(

int

vtxID

)

returns the vertex ID of the neighbour on its bottom

int FlowGeometry::getDimX

(

)

[inline]

returns the number of vertices in X dimension

int FlowGeometry::getDimY

(

)

[inline]

returns the number of vertices in Y dimension

int FlowGeometry::getDimZ

(

)

[inline]

returns the number of vertices in Z dimension, is always 1

bool FlowGeometry::getInterpolationAt	(	vec3	pos,
		int *	vtxID,
		float *	coef
	)

Returns true if inside. Stores the vertex indices and interpolation weights for the given position in the arrays.

Interpolates the value for a point using its four neighbor vertices.

Stores the indexes and weights of vertices surrounding the given position. This information can be used later on for interpolation of channel values.

Parameters:

	pos	geometrical position for the lookup
	vtxID	list of surrounding vertices (given by vertex ID)
	coef	list of surrounding vertex weights (sum == 1.0)

Returns:

true if the given position is inside of the geometrical boundaries

int FlowGeometry::getLeftNeigh

(

int

vtxID

)

returns the vertex ID of the neighbour on its left

float FlowGeometry::getMaxX

(

)

[inline]

returns the maximum in the X dimension

float FlowGeometry::getMaxY

(

)

[inline]

returns the maximum in the Y dimension

float FlowGeometry::getMinX

(

)

[inline]

returns the minimum in the X dimension

float FlowGeometry::getMinY

(

)

[inline]

returns the minimum in the Y dimension

int FlowGeometry::getNearestVtx

(

vec3

pos

)

[private]

a very slow and dumb routine, that finds the nearest vertex to the given position

Improved version of getNearestVtx(). Compares the distance only to the four surrounding neighbor vertices and returns the closest.

vec3 FlowGeometry::getPos

(

int

vtxID

)

[inline, private]

returns the position of the vertex

float FlowGeometry::getPosX

(

int

vtxID

)

[inline, private]

returns the x position of the vertex

float FlowGeometry::getPosY

(

int

vtxID

)

[inline, private]

returns the y position of the vertex

int FlowGeometry::getRightNeigh

(

int

vtxID

)

returns the vertex ID of the neighbour on its right

int FlowGeometry::getTopNeigh

(

int

vtxID

)

returns the vertex ID of the neighbour on its top

int FlowGeometry::getVtx	(	int	x,
		int	y
	)			[private]

returns general vtxID for the vertex array indexes

int FlowGeometry::getVtxX

(

int

vtxID

)

[private]

returns X index for the general vtxID

int FlowGeometry::getVtxY

(

int

vtxID

)

[private]

returns Y index for the general vtxID

int FlowGeometry::getXYvtx

(

vec3

pos

)

[private]

returns X index of the last vertex lying left to the position x and the Y index of the last vertex lying under the position y

vec3 FlowGeometry::normalizeCoords

(

vec3

pos

)

compression of coordinates in each dimension separately, returns values scaled to <0,1>

bool FlowGeometry::readFromFile	(	char *	header,
		FILE *	fp,
		bool	bigEndian
	)

reads the geometry gris data from a file

vec3 FlowGeometry::unNormalizeCoords

(

vec3

pos

)

inverts the compression. From values of <0,1> it restores the real geometrical coordinates

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Friends And Related Function Documentation

friend class FlowData [friend]

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Member Data Documentation

vec3 FlowGeometry::boundaryMax [private]

maximum boundary values for the dataset geometry sotred as (maxX, maxY)

vec3 FlowGeometry::boundaryMin [private]

minimum boundary values for the dataset geometry sotred as {minX, minY)

vec3 FlowGeometry::boundarySize [private]

boundary sizes for the dataset geometry sotred as (maX - minX, maxY - minY)

int FlowGeometry::counter [private]

int FlowGeometry::dim[2] [private]

resolution of the data for the dimensions X, Y

vec3* FlowGeometry::geometryData [private]

Storage for the geometry.

bool FlowGeometry::isFlipped [private]

indicates whether the x and y axes have to be swaped

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The documentation for this class was generated from the following files:

• Desktop/Visualisuerung/Bsp2/FlowVisFramework/header/FlowGeometry.h
• Desktop/Visualisuerung/Bsp2/FlowVisFramework/src/FlowGeometry.cpp