Histogram Class Reference

#include <Histogram.h>

Inherits GuiComponent.

List of all members.

Public Member Functions
	Histogram ()
	~Histogram ()
void	update (unsigned short *data, unsigned int &size)
void	render (int x, int y, int width, int height)
void	onLeftMouseClick (int x, int y)
void	onMouseDrag (int x, int y)
void	getColorByDensity (unsigned short &density, float &red, float &green, float &blue, float &alpha)
bool	isInitialised ()
bool	removeControlPoint ()
Public Attributes
TxPoint *	grabbedPoint

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Detailed Description

This class defines a histogram. The Histrogram shows the density distribution of the voxelData wich had been loaded by the RawReader. Thus we give a pointer to the voxelData array and count therein the occurrence of the density values (in the range of 2^12 = 4096).

Definition at line 33 of file Histogram.h.

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Constructor & Destructor Documentation

Histogram::Histogram (   )

The constructor of the Histogram creates the window wich shows the histogram. Definition at line 18 of file Histogram.cpp. References grabbedPoint.

Histogram::~Histogram (   )  [inline]

The destructor deletes the pointes that are initialised by the contructor. Definition at line 71 of file Histogram.h. References grabbedPoint.

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Member Function Documentation

void Histogram::getColorByDensity (  unsigned short &  density, float &  red, float &  green, float &  blue, float &  alpha )

This function takes a specific density and computes the resulting color responding to the histogram attached control points. Parameters: density  for wich your want to know the color red  component green  component blue  component alpha  component Definition at line 176 of file Histogram.cpp. References TxFunction::getLinearInterpolatedColor().

bool Histogram::isInitialised (   )  [inline]

Return the flag wether the histogram is initalised Definition at line 133 of file Histogram.h.

void Histogram::onLeftMouseClick (  int  x, int  y )

This method is called, when the user hit the histogram at a given position x and y - e.g. when clicked with the mouse. The function determines if: 1. the user clicked on an empty space 2. the user selected an existing controlpoint In the first case, the program will add a new controlpoint at the given position. In the second case the program will ask the user if her wants to delete or change the controlpoint. Parameters: x  position of the cursor y  position of the cursor Definition at line 62 of file Histogram.cpp. References TxFunction::addControlPoint(), OrthographicCamera::getLocalWorldCoordinates(), grabbedPoint, GuiComponent::hit(), and TxFunction::hitTxPoint().

void Histogram::onMouseDrag (  int  x, int  y )

This method is called, each time the user drag the mouse over the histogram. This usually happens when a controlpoint is moved. Parameters: x  position of the cursor y  position of the cursor Definition at line 99 of file Histogram.cpp. References OrthographicCamera::getLocalWorldCoordinates(), grabbedPoint, GuiComponent::hit(), TxFunction::moveControlPoint(), and TxPoint::rgba.

bool Histogram::removeControlPoint (   )

Remove the current grabbed point. If the point is NULL, the method returns false and nothing is removed. Definition at line 202 of file Histogram.cpp. References grabbedPoint, and TxFunction::removeControlPoint().

void Histogram::render (  int  x, int  y, int  width, int  height )

This function is responsible for the drawing of the histogram. Therefore it takes 4 parameters wich determine the viewport - e.g. where the histogram is drawn and wich size it has. Internal the histogram is always drawn with an orthographic projection. Parameters: x  position of the histogram y  position of the histogram width  of the histogram height  of the histogram Definition at line 114 of file Histogram.cpp. References TxFunction::render(), OrthographicCamera::startCamera(), and OrthographicCamera::stopCamera().

void Histogram::update (  unsigned short *  data, unsigned int &  size )

This method initialise the frequency of occurrence of the density by reading each densiy value from the given array and adding +1 to the entry occurenceArray[density]. This function should be called each time, a new file is opened Parameters: *data  a reference to the voxelData of the RawReader &size  the size of the array read Definition at line 26 of file Histogram.cpp. References GuiComponent::enable(), and GuiComponent::hide().

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Member Data Documentation

TxPoint* Histogram::grabbedPoint

Pointer to the slected TxPoint. Definition at line 60 of file Histogram.h. Referenced by Histogram(), onLeftMouseClick(), onMouseDrag(), removeControlPoint(), and ~Histogram().

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

• D:/Study/9.Semester/Visualisierung/Lu/1/final5/Histogram.h
• D:/Study/9.Semester/Visualisierung/Lu/1/final5/Histogram.cpp

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