GLWidget Class Reference

#include <glwidget.h>

List of all members.

Public Slots
void	setBackgroundColors ()
void	setArrowColors ()
void	setStreamlineColors ()
void	setDrawBackground (bool state)
void	setBackgroundColorChannel (int channel)
void	setDrawArrows (bool state)
void	setArrowQuantity (int quantity)
void	setArrowColorChannel (int channel)
void	setDrawStreamlines (bool state)
void	setStreamlineMode (int mode)
void	setStreamlineDtest (int newDtest)
void	setStreamlineDsep (int newDsep)
void	setStreamlineDt (int newDt)
void	setStreamlinePeriod (int Period)
void	setStreamlineLineMode (int mode)
void	setStreamlineColorChannel (int channel)
Public Member Functions
	GLWidget (QWidget *parent=0)
QSize	minimumSizeHint () const
QSize	sizeHint () const
void	setFlowData (FlowData *newFlowData)
void	setBackgroundColorsPtr (QRgb *colorsPtr)
void	setArrowColorsPtr (QRgb *colorsPtr)
void	setStreamlineColorsPtr (QRgb *colorsPtr)
Protected Member Functions
void	initializeGL ()
void	paintGL ()
void	resizeGL (int width, int height)
void	mousePressEvent (QMouseEvent *event)
void	mouseReleaseEvent (QMouseEvent *event)
void	mouseMoveEvent (QMouseEvent *event)
void	wheelEvent (QWheelEvent *event)
Private Member Functions
void	draw ()
void	normalizeAngle (int *angle)
char *	file2string (const std::string &strFilename)
GLuint	loadShader (const std::string &strFilename)
void	printLog (GLuint obj)
void	drawArrowPlot (const int xScaler, const int yScaler)
void	calcEuler (float x, float y)
void	calcRunge (float x, float y)
void	calculateBackground ()
void	drawStreamline (int mode)
bool	testRange (vec3 point)
bool	testCell (int cellx, int celly, vec3 point)
float	getTapering (vec3 point, vector< vec3 > line, unsigned int i)
float	testCellTapering (int cellx, int celly, vec3 point, vector< vec3 > line, unsigned int i)
bool	testSLDist (vec3 point, vector< vec3 > line, unsigned int i)
void	calculateEvenStreamlines ()
void	addPoint2Grid (vec3 point)
void	calcStartCandidates (vec3 pos)
void	initStreamlines ()
void	removeLastPointfromCell (vec3 point)

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Detailed Description

Sets up a Qt OpenGl Canvas Widget.

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Constructor & Destructor Documentation

GLWidget::GLWidget

(

QWidget *

parent = 0

)

Sets up a Qt OpenGl Canvas.

Parameters:

parent

is the parent window of the canvas.

---

Member Function Documentation

QSize GLWidget::minimumSizeHint

(

)

const

Returns:

The minimum size for the Widget.

QSize GLWidget::sizeHint

(

)

const

Returns:

The size hint for the Widget.

void GLWidget::setFlowData

(

FlowData *

newFlowData

)

Sets up the Canvas for a new Flowdata object.

Parameters:

newFlowData

is the new Flowdata.

void GLWidget::setBackgroundColorsPtr

(

QRgb *

colorsPtr

)

Initializes the pointer to the background transferfunction array.

Parameters:

colorsPtr

is the pointer to the new array.

void GLWidget::setArrowColorsPtr

(

QRgb *

colorsPtr

)

Initializes the pointer to the arrow transferfunction array.

Parameters:

colorsPtr

is the pointer to the new array.

void GLWidget::setStreamlineColorsPtr

(

QRgb *

colorsPtr

)

Initializes the pointer to the streamline transferfunction array.

Parameters:

colorsPtr

is the pointer to the new array.

void GLWidget::setBackgroundColors

(

)

[slot]

Notifies that the background transferfunction has changed and redraws the scene.

void GLWidget::setArrowColors

(

)

[slot]

Notifies that the arrow transferfunction has changed and redraws the scene.

void GLWidget::setStreamlineColors

(

)

[slot]

Notifies that the streamline transferfunction has changed and redraws the scene.

void GLWidget::setDrawBackground

(

bool

state

)

[slot]

Sets the current background Rendermode.

Parameters:

state

holds if the backround should be drawn or not.

void GLWidget::setBackgroundColorChannel

(

int

channel

)

[slot]

Sets the current FlowChannel for the background transferfunction.

Parameters:

channel

the new Channel.

void GLWidget::setDrawArrows

(

bool

state

)

[slot]

Sets the current arrow Rendermode.

Parameters:

state

holds if the backround should be drawn or not.

void GLWidget::setArrowQuantity

(

int

quantity

)

[slot]

Sets the current arrow quantity.

Parameters:

quantity

holds how many arrows should be drawn.

void GLWidget::setArrowColorChannel

(

int

channel

)

[slot]

Sets the current FlowChannel for the arrow transferfunction.

Parameters:

channel

the new Channel.

void GLWidget::setDrawStreamlines

(

bool

state

)

[slot]

Sets the current streamline Rendermode.

Parameters:

state

holds if the backround should be drawn or not.

void GLWidget::setStreamlineMode

(

int

mode

)

[slot]

Sets the current streamline integrationmode.

Parameters:

mode

holds the integrationmode.

void GLWidget::setStreamlineDtest

(

int

newDtest

)

[slot]

Sets the relation of the dtest to the dsep parameter for the streamline algorithm.

Parameters:

newDtest

new dtest relation parameter.

void GLWidget::setStreamlineDsep

(

int

newDsep

)

[slot]

Sets the relation of the dsep parameter to the shorter dimension of the dataset.

Parameters:

newDsep

new dsep relation parameter.

void GLWidget::setStreamlineDt

(

int

newDt

)

[slot]

Sets the relation of the dt to the dtest parameter for the streamline algorithm.

Parameters:

newDt

new dt relation parameter.

void GLWidget::setStreamlinePeriod

(

int

newPeriod

)

[slot]

Sets length of the period for the streamline texture visualization mode.

Parameters:

newPeriod

new period length.

void GLWidget::setStreamlineLineMode

(

int

mode

)

[slot]

Sets the current streamline visualization style.

Parameters:

mode

holds the streamline visualization style.

void GLWidget::setStreamlineColorChannel

(

int

channel

)

[slot]

Sets the current FlowChannel for the streamline transferfunction.

Parameters:

channel

the new Channel.

void GLWidget::initializeGL

(

)

[protected]

Initialzes the OpenGl environment including antialiasing.

void GLWidget::paintGL

(

)

[protected]

Applys affine transformations and starts the drawing of the frame.

void GLWidget::resizeGL	(	int	width,
		int	height
	)			[protected]

Handles resizing of the OpenGl canvas.

Parameters:

	width	is the new width of the canvas.
	height	is the new height of the canvas.

void GLWidget::mousePressEvent

(

QMouseEvent *

event

)

[protected]

Reduces the stepsize of the raycastingshader and initialises volume rotations.

Parameters:

event

is the mousePressEvent.

void GLWidget::mouseReleaseEvent

(

QMouseEvent *

event

)

[protected]

Increases the stepsize of the raycastingshader after finished volume rotations.

Parameters:

event

is the mouseReleaseEvent.

void GLWidget::mouseMoveEvent

(

QMouseEvent *

event

)

[protected]

Handles mouse dragging and rotation of the volume.

Parameters:

event

is the mouseMoveEvent.

void GLWidget::wheelEvent

(

QWheelEvent *

event

)

[protected]

Handles mouseWheelEvents.

Parameters:

event

is the mouseWheelEvent.

void GLWidget::draw

(

)

[private]

Draws texture, arrow and streamline layers (if activated).

void GLWidget::normalizeAngle

(

int *

angle

)

[private]

Keeps angle within [0 360] interval.

Parameters:

angle

is the pointer to the angle.

char * GLWidget::file2string

(

const std::string &

strFilename

)

[private]

Loads a binary file into a Charpointer.

Parameters:

strFilename

ist the filename of the file to load.

Returns:

The Charpointer with the content of the file.

GLuint GLWidget::loadShader

(

const std::string &

strFilename

)

[private]

Handels loading, compiling and attaching of a vertex-, fragmentshader pair to a shader program. * Loading requires 2 glsl shader files with "<filepath>.vert" and "<filepath>.frag" extension to be successful.

Parameters:

strFilename

is the filepath of the shaders without extension.

Returns:

The id of the new shaderprogram.

void GLWidget::printLog

(

GLuint

obj

)

[private]

Prints the shaderobject debug log.

Parameters:

obj

specifies the shaderobject.

void GLWidget::drawArrowPlot	(	const int	xScaler,
		const int	yScaler
	)			[private]

Draws the Arrowlayer.

Parameters:

	xScaler	density of arrows in x-direction.
	yScaler	density of arrows in y-direction.

void GLWidget::calcEuler	(	float	x,
		float	y
	)			[private]

Calculates a streamline in both directions of the given point using the Euler integration method.

Parameters:

	x	component of the startpoint.
	y	component of the startpoint.

void GLWidget::calcRunge	(	float	x,
		float	y
	)			[private]

Calculates a streamline in both directions of the given point using the Runge-Kutta integration method.

Parameters:

	x	component of the startpoint.
	y	component of the startpoint.

void GLWidget::calculateBackground

(

)

[private]

Creates the background texture layer.

void GLWidget::drawStreamline

(

int

mode

)

[private]

Draws the streamline layer with the given visualization mode.

Parameters:

mode

line draw mode (0: normal | 1: tapered | 2: glyphs | 3: texture)

bool GLWidget::testRange

(

vec3

point

)

[private]

Tests if the given point is within dtest range to an already existing point.

Parameters:

point

point to test.

bool GLWidget::testCell	(	int	cellx,
		int	celly,
		vec3	point
	)			[private]

Tests if the given point is within dtest range to a point in the specified cell.

Parameters:

	cellx	x-coordinate of the cell.
	celly	y-coordinate of the cell.
	point	point to test.

float GLWidget::getTapering	(	vec3	point,
		vector< vec3 >	line,
		unsigned int	i
	)			[private]

Tests if the given point is within dsep range to an already existing point and returns tapering thickness.

Parameters:

	point	point to test.
	line	the line containing the testpoint.
	i	index of the testpoint within the line (to prevent getting hits from neighbours).

float GLWidget::testCellTapering	(	int	cellx,
		int	celly,
		vec3	point,
		vector< vec3 >	line,
		unsigned int	i
	)			[private]

Tests if the given point is within dsep range to a point in the specified cell and returns distance to the nearest point.

Parameters:

	cellx	x-coordinate of the cell.
	celly	y-coordinate of the cell.
	point	point to test.
	line	the line containing the testpoint.
	i	index of the testpoint within the line (to prevent getting hits from neighbours)

bool GLWidget::testSLDist	(	vec3	point,
		vector< vec3 >	line,
		unsigned int	i
	)			[private]

Tests if the given point is member of the given line and at least ceil(dsep/dt) indices away from i.

Parameters:

	point	point to test.
	line	the line containing the testpoint.
	i	index of the testpoint within the line.

void GLWidget::calculateEvenStreamlines

(

)

[private]

Calculates evenly-spaced streamlines according to the method of Bruno Jobard and Wilfrid Lefer.

void GLWidget::addPoint2Grid

(

vec3

point

)

[private]

Adds the given point to the correct cell of the grid.

Parameters:

point

point to add.

void GLWidget::calcStartCandidates

(

vec3

pos

)

[private]

Calculates two new startpoints from the origin, validates and adds them to the startCandidates queue.

Parameters:

pos

origin point.

void GLWidget::initStreamlines

(

)

[private]

Sets up the environment to recalculate the streamlines.

void GLWidget::removeLastPointfromCell

(

vec3

point

)

[private]

Removes the last added point from the cell of the given point.

Parameters:

point

reference to the cell.

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

• glwidget.h
• glwidget.cpp