Docs For Class Image_Graph

Class: Image_Graph_Tool

Inherited Variables

Inherited Methods

Class Details

[line 45]
This class contains a set of tool-functions.

These functions are all to be called statically

Author: Stefan Neufeind <pear.neufeind@speedpartner.de>
Author: Jesper Veggerby <pear.nosey@veggerby.dk>
Version: Release: 0.8.0
Copyright: 2003-2009 The PHP Group
Link: http://pear.php.net/package/Image_Graph
License: LGPL License 2.1

Method Detail

bezier [line 117]

double bezier(
double
$t, double
$p1, double
$p2, double
$p3, double
$p4)

Calculates a Bezier point, this function must be called for BOTH X and Y coordinates (will it work for 3D coordinates!?)

Return: The bezier value of the point t between $p2 and $p3 using $p1 and $p4 to calculate control points

Parameters:

double	`$t`	—	A position between $p2 and $p3, value between 0 and 1
double	`$p1`	—	Point to use for calculating control points
double	`$p2`	—	Point 1 to calculate bezier curve between
double	`$p3`	—	Point 2 to calculate bezier curve between
double	`$p4`	—	Point to use for calculating control points

[ Top ]

calculateArcDimensionAndCenter [line 177]

array calculateArcDimensionAndCenter(
int
$v1, int
$v2)

Calculate the dimensions and center point (of gravity) for an arc

Return: An array with the dimensions in a fraction of a circle width radius 1 'rx', 'ry' and the center point of gravity ('cx', 'cy')

Parameters:

int	`$v1`	—	The angle at which the arc starts
int	`$v2`	—	The angle at which the arc ends

[ Top ]

calculateLinearRegression [line 268]

array calculateLinearRegression(
array
&$data)

Calculate linear regression on a dataset

Return: The slope and intersection of the "best-fit" line

Parameters:

array &$data — The data to calculate regression upon

[ Top ]

close2zero [line 158]

double close2zero(
double
$value, int
$decimal)

If a number is close 0 zero (i.e. 0 within $decimal decimals) it is rounded down to zero

Return: The value or zero if "close enough" to zero

Parameters:

double	`$value`	—	The value to round
int	`$decimal`	—	The number of decimals

[ Top ]

controlPoint [line 91]

double controlPoint(
double
$p1, double
$p2, double
$factor, [double
$smoothFactor = 0.75])

Calculates a Bezier control point, this function must be called for BOTH X and Y coordinates (will it work for 3D coordinates!?)

Return: P1 mirrored in P2 by Factor

Parameters:

double	`$p1`	—	1st point
double	`$p2`	—	2nd point
double	`$factor`	—	Mirror factor, 0 returns P2, 1 returns a pure mirror, i.e. P1 on the exact other side of P2
double	`$smoothFactor`	—	How much to smooth the curve (0..1)

[ Top ]

mid [line 57]

double mid(
double
$p1, double
$p2)

Return the average of 2 points

Return: The average of P1 and P2

Parameters:

double	`$p1`	—	1st point
double	`$p2`	—	2nd point

[ Top ]

mirror [line 73]

double mirror(
double
$p1, double
$p2, [double
$factor = 1])

Mirrors P1 in P2 by a amount of Factor

Return: mirrored in $p2 by Factor

Parameters:

double	`$p1`	—	1st point, point to mirror
double	`$p2`	—	2nd point, mirror point
double	`$factor`	—	Mirror factor, 0 returns $p2, 1 returns a pure mirror, ie $p1 on the exact other side of $p2

[ Top ]

rotate [line 138]

array rotate(
int
$x, int
$y, int
$xc, int
$yc, int
$angle)

For a given point (x,y) return a point rotated by a given angle aroung the center (xy,yc)

Return: the coordinate of the new point

Parameters:

int	`$x`	—	x coordinate of the point to rotate
int	`$y`	—	y coordinate of the point to rotate
int	`$xc`	—	x coordinate of the center of the rotation
int	`$yc`	—	y coordinate of the center of the rotation
int	`$angle`	—	angle of the rotation

[ Top ]

Class: Image_Graph_Tool

Class Overview

Author(s):

Version:

Copyright:

Methods

Inherited Variables

Inherited Methods

Class Details

Method Detail

bezier [line 117]

Parameters:

calculateArcDimensionAndCenter [line 177]

Parameters:

calculateLinearRegression [line 268]

Parameters:

close2zero [line 158]

Parameters:

controlPoint [line 91]

Parameters:

mid [line 57]

Parameters:

mirror [line 73]

Parameters:

rotate [line 138]

Parameters: