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Graph: ezcGraphDataSetAveragePolynom

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Class: ezcGraphDataSetAveragePolynom

Extension of basic dataset to represent averation. [source]
Algorithm: http://en.wikipedia.org/wiki/Least_squares

Parents

ezcGraphDataSet
   |
   --ezcGraphDataSetAveragePolynom

Properties

int read/write  $polynomOrder
Maximum order of polygon to interpolate from points
int read/write  $resolution
Resolution used to draw line in graph

Member Variables

protected float $max = false
Maximum key
protected float $min = false
Minimum key
protected ezcGraphPolynom $polynom = false
Calculated averation polynom
protected int $position = 0
Position of the data iterator. Depends on the configured resolution.
protected array(string=>mixed) $properties
Container to hold the properties
protected ezcGraphDataSet $source
Source dataset to base averation on.

Inherited Member Variables

From ezcGraphDataSet:
protected  ezcGraphDataSet::$current
protected  ezcGraphDataSet::$data
protected  ezcGraphDataSet::$keys
protected  ezcGraphDataSet::$pallet

Method Summary

protected void buildPolynom( )
Build the polynom based on the given points.
public int count( )
Returns the number of elements in this dataset
public string current( )
Returns the currently selected datapoint.
protected float getKey( $position )
Get the x coordinate for the current position
public ezcGraphPolynom getPolynom( )
Returns a polynom of the defined order witch matches the datapoints using the least squares algorithm.
public string key( )
Returns the key of the currently selected datapoint.
public float next( )
Returns the next datapoint and selects it or false on the last datapoint.
public bool offsetExists( $key )
Returns true if the given datapoint exists Allows isset() using ArrayAccess.
public float offsetGet( $key )
Returns the value for the given datapoint Get an datapoint value by ArrayAccess.
public void offsetSet( $key, $value )
Throws a ezcBasePropertyPermissionException because single datapoints cannot be set in average datasets.
public float rewind( )
Selects the very first datapoint and returns it.
public bool valid( )
Returns if the current datapoint is valid.
public mixed __get( $propertyName )
Property get access.
public mixed __set( $propertyName, $propertyValue )
Options write access

Inherited Methods

From ezcGraphDataSet :
public string ezcGraphDataSet::current()
Returns the currently selected datapoint.
public string ezcGraphDataSet::key()
Returns the key of the currently selected datapoint.
public float ezcGraphDataSet::next()
Returns the next datapoint and selects it or false on the last datapoint.
public bool ezcGraphDataSet::offsetExists()
Returns true if the given datapoint exists Allows isset() using ArrayAccess.
public float ezcGraphDataSet::offsetGet()
Returns the value for the given datapoint Get an datapoint value by ArrayAccess.
public void ezcGraphDataSet::offsetSet()
Sets the value for a datapoint.
public void ezcGraphDataSet::offsetUnset()
Unset an option.
public float ezcGraphDataSet::rewind()
Selects the very first datapoint and returns it.
public bool ezcGraphDataSet::valid()
Returns if the current datapoint is valid.
public mixed ezcGraphDataSet::__get()
Property get access.

Methods

buildPolynom

void buildPolynom( )
Build the polynom based on the given points.

count

int count( )
Returns the number of elements in this dataset

current

string current( )
Returns the currently selected datapoint.
This method is part of the Iterator interface to allow access to the datapoints of this row by iterating over it like an array (e.g. using foreach).

Redefinition of

Method Description
ezcGraphDataSet::current() Returns the currently selected datapoint.

getKey

float getKey( int $position )
Get the x coordinate for the current position

Parameters

Name Type Description
$position int Position

getPolynom

ezcGraphPolynom getPolynom( )
Returns a polynom of the defined order witch matches the datapoints using the least squares algorithm.

key

string key( )
Returns the key of the currently selected datapoint.
This method is part of the Iterator interface to allow access to the datapoints of this row by iterating over it like an array (e.g. using foreach).

Redefinition of

Method Description
ezcGraphDataSet::key() Returns the key of the currently selected datapoint.

next

float next( )
Returns the next datapoint and selects it or false on the last datapoint.
This method is part of the Iterator interface to allow access to the datapoints of this row by iterating over it like an array (e.g. using foreach).

Redefinition of

Method Description
ezcGraphDataSet::next() Returns the next datapoint and selects it or false on the last datapoint.

offsetExists

bool offsetExists( string $key )
Returns true if the given datapoint exists Allows isset() using ArrayAccess.

Parameters

Name Type Description
$key string The key of the datapoint to get.

Redefinition of

Method Description
ezcGraphDataSet::offsetExists() Returns true if the given datapoint exists Allows isset() using ArrayAccess.

offsetGet

float offsetGet( string $key )
Returns the value for the given datapoint Get an datapoint value by ArrayAccess.

Parameters

Name Type Description
$key string The key of the datapoint to get.

Redefinition of

Method Description
ezcGraphDataSet::offsetGet() Returns the value for the given datapoint Get an datapoint value by ArrayAccess.

offsetSet

void offsetSet( string $key, float $value )
Throws a ezcBasePropertyPermissionException because single datapoints cannot be set in average datasets.

Parameters

Name Type Description
$key string The kex of a datapoint to set.
$value float The value for the datapoint.

Throws

ClassDescription
ezcBasePropertyPermissionException Always, because access is readonly.

Redefinition of

Method Description
ezcGraphDataSet::offsetSet() Sets the value for a datapoint.

rewind

float rewind( )
Selects the very first datapoint and returns it.
This method is part of the Iterator interface to allow access to the datapoints of this row by iterating over it like an array (e.g. using foreach).

Redefinition of

Method Description
ezcGraphDataSet::rewind() Selects the very first datapoint and returns it.

valid

bool valid( )
Returns if the current datapoint is valid.
This method is part of the Iterator interface to allow access to the datapoints of this row by iterating over it like an array (e.g. using foreach).

Redefinition of

Method Description
ezcGraphDataSet::valid() Returns if the current datapoint is valid.

__get

mixed __get( string $propertyName )
Property get access.
Simply returns a given option.

Parameters

Name Type Description
$propertyName string The name of the option to get.

Throws

ClassDescription
ezcBasePropertyNotFoundException If a the value for the property options is not an instance of

Redefinition of

Method Description
ezcGraphDataSet::__get() Property get access.

__set

mixed __set( mixed $propertyName, mixed $propertyValue )
Options write access

Parameters

Name Type Description
$propertyName mixed Option name
$propertyValue mixed Option value;

Throws

ClassDescription
ezcBaseValueException If value is out of range
ezcBasePropertyNotFoundException If Option could not be found

Last updated: Mon, 21 Dec 2009