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php-plotlib.class.php
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php-plotlib.class.php
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<?php
/** php-plotlib.class.php
*
* Class for generate graphs similar to python matplotlib
*
* @author Rafael Martin Soto
* @author {@link https://www.inatica.com/ Inatica}
* @blog {@link https://rafamartin10.blogspot.com/ Blog Rafael Martin Soto}
* @since October 2021
* @version 1.0.0
* @license GNU General Public License v3.0
*
* */
require_once __DIR__ . '/graph-php/graph-php.class.php';
class php_plotlib extends graph{
/**
* Define array of php_plotlib's
*/
public $subplots = [];
public function __construct( $cfg = null) {
parent::__construct( $cfg );
} // / __construct
/**
* Method to divide GD in subplots
*
* @param integer $numyplots = null
* @param integer $numxplots = null
* @param string $bordertype = 'square'
*/
public function subplots( $numyplots = null, $numxplots = null, $cfg = [ 'bordertype' => 'square', 'figsize' => [6.4, 4.8], 'paddingleft' => .2, 'paddingbottom' => .15 ]){
// if all params are null or their values are 1, return. We use our own GD graph
$yplots = ((is_null($numyplots))?1:$numyplots);
$xplots = ((is_null($numxplots))?1:$numxplots);
if( $yplots <= 1 && $xplots <= 1 ){
return;
}
if( !isset($cfg['bordertype']) ){
$cfg['bordertype'] = 'square';
}
if( !isset($cfg['figsize']) ){
$cfg['figsize'] = [ $this->cfg['width'], $this->cfg['height' ]];
}
if( !isset($cfg['paddingleft']) ){
$cfg['paddingleft'] = .2;
}
if( !isset($cfg['paddingbottom']) ){
$cfg['paddingbottom'] = .15;
}
$figurewidth = $cfg['figsize'][0];
$figureheight = $cfg['figsize'][1];
// Initialize $this->subplots
$this->subplots = [];
$widthsubplots = $figurewidth/$xplots;
$heightsubplots = $figureheight/$yplots;
$dinamicleftpadding = $cfg['paddingleft'];
$dinamicbottompadding = $cfg['paddingbottom'];
for( $i=0; $i<$yplots; $i++ ){
if( $xplots>1 ){
$subplotsx = [];
for( $j=0; $j<$xplots; $j++ ){
$subplotsx[] = new php_plotlib();
$subplotsx[$j]->width( $widthsubplots );
$subplotsx[$j]->height( $heightsubplots );
if( $j>0 ){
$subplotsx[$j]->cfg['yshowlabelticks'] = false;
$subplotsx[$j]->cfg['paddingleft'] -= $dinamicleftpadding; // less padding. No need to draw ticks labels
} else {
//$subplotsx[$j]->cfg['paddingleft'] += $dinamicleftpadding + 2; // Add more padding for draw Y Label
//$subplotsx[$j]->width( $widthsubplots + $dinamicleftpadding + 1.5 );
$subplotsx[$j]->width( $widthsubplots + $dinamicleftpadding );
$subplotsx[$j]->cfg['paddingleft'] += $dinamicleftpadding; // Add more padding for draw Y Label
}
if( $i<$yplots-1 ){
$subplotsx[$j]->cfg['xshowlabelticks'] = false;
$subplotsx[$j]->cfg['paddingbottom'] -= $dinamicbottompadding; // less padding. No need to draw ticks labels
} else {
$subplotsx[$j]->height( $heightsubplots + $dinamicbottompadding );
$subplotsx[$j]->cfg['paddingbottom'] += $dinamicbottompadding; // Add more padding for draw Y Label
}
$subplotsx[$j]->cfg['paddingtop'] = 0; // less padding. No need to draw nothing
$subplotsx[$j]->cfg['paddingright'] = 0; // less padding. No need to draw nothing
$subplotsx[$j]->cfg['bordertype'] = $cfg['bordertype'];
}
} else {
$subplotsx = new php_plotlib();
$subplotsx->width( $widthsubplots );
$subplotsx->height( $heightsubplots );
if( $i<$yplots-1 ){
$subplotsx->cfg['xshowlabelticks'] = false;
$subplotsx->cfg['paddingbottom'] -= $dinamicbottompadding; // less padding. No need to draw ticks labels
} else {
$subplotsx->height( $heightsubplots + $dinamicleftpadding );
$subplotsx->cfg['paddingbottom'] += $dinamicbottompadding; // Add more padding for draw Y Label
}
$subplotsx->cfg['paddingtop'] = 0; // less padding. No need to draw nothing
$subplotsx->cfg['paddingright'] = 0; // less padding. No need to draw nothing
$subplotsx->cfg['bordertype'] = $cfg['bordertype'];
}
$this->subplots[] = $subplotsx;
}
unset( $i );
unset( $j );
unset( $yplots );
unset( $xplots );
unset( $subplotsx );
unset( $widthsubplots );
unset( $heightsubplots );
unset( $figurewidth );
unset( $figureheigth );
} // /subplots()
/**
* return a png stream of graph base64
*
* @param array $cfg
* @return string $png_stream
*/
public function output_gd_png_base64( $cfg = null){
$yplots = count( $this->subplots );
if($yplots>0){
$xplots = count( $this->subplots[0] );
} else {
return parent::output_gd_png_base64( $cfg );
}
// Generate graphs
$height = 0;
for( $i=0; $i<$yplots; $i++ ){
$widthsubplot = 0;
for( $j=0; $j<$xplots; $j++ ){
// Create graph on subplot
$this->subplots[$i][$j]->draw_to_output( $cfg );
$widthsubplot += imagesx($this->subplots[$i][$j]->gd);
$heigthsubplot = imagesy($this->subplots[$i][$j]->gd);
}
$height += $heigthsubplot;
}
$this->gd = @imagecreatetruecolor( $widthsubplot, $height ) or die("Cannot Initialize new GD image stream");
$y = 0;
for( $i=0; $i<$yplots; $i++ ){
$x = 0;
for( $j=0; $j<$xplots; $j++ ){
$widthsubplot = imagesx($this->subplots[$i][$j]->gd);
$heigthsubplot = imagesy($this->subplots[$i][$j]->gd);
// Copy gd image created in each subplot to $this->gd
imagecopy( $this->gd, $this->subplots[$i][$j]->gd, $x, $y, 0, 0, $widthsubplot, $heigthsubplot);
$x += $widthsubplot;
}
$y += $heigthsubplot;
}
unset( $i );
unset( $j );
unset( $x );
unset( $y );
unset( $yplots );
unset( $xplots );
unset( $widthsubplots );
return 'data:image/png;base64,' . base64_encode( $this->output_gd_png_raw( ) );
} // /output_gd_png_base64()
/**
* Method to set width in plot & subplots
*
* @param float $width = 6.4
*/
public function width( $width = 6.4){
$this->cfg['width'] = $width;
$yplots = count( $this->subplots );
if($yplots>0){
$xplots = count( $this->subplots[0] );
} else {
parent::width( $width );
return;
}
$widthsubplots = $this->cfg['width']/$xplots;
for( $i=0; $i<$yplots; $i++ ){
for( $j=0; $j<$xplots; $j++ ){
$this->subplots[$i][$j]->width( $widthsubplots );
}
}
unset( $i );
unset( $j );
unset( $yplots );
unset( $xplots );
unset( $widthsubplots );
} // /width()
/**
* Method to set height in plot & subplots
*
* @param float $height = 4.8
*/
public function height( $height = 4.8){
$this->cfg['height'] = $height;
$yplots = count( $this->subplots );
if($yplots>0){
$xplots = count( $this->subplots[0] );
} else {
parent::height( $height );
return;
}
$heightsubplots = $this->cfg['height']/$yplots;
for( $i=0; $i<$yplots; $i++ ){
for( $j=0; $j<$xplots; $j++ ){
$this->subplots[$i][$j]->height( $heightsubplots );
}
}
unset( $i );
unset( $j );
unset( $yplots );
unset( $xplots );
unset( $heightsubplots );
} // /height()
/**
* Method to create graph between each field in dataset
*
* NOTE: The system assumes that the first line contains the name of each field
*
* @param array $dataset
*/
public function pairplot( $dataset, $cfg = null ){
$widthmarker = ((isset($cfg['widthmarker']))?$cfg['widthmarker']:5);
$colnames = $dataset[0];
$numcols = count( $colnames );
$numrows = count( $dataset ) - 1; // First row is colnames. Need to substract it
$widthsubplot = 6.4 / 2; // Default size
$heightsubplot = 4.8 / 2; // Default size
$cfg = ['figsize'=>[$numcols * $widthsubplot, $numcols * $heightsubplot], 'bordertype'=>'halfsquare'];
$this->subplots( $numcols, $numcols, $cfg );
for( $i=0; $i<$numcols; $i++ ){
for( $j=0; $j<$numcols; $j++ ){
$this->subplots[$i][$j]->cfg['width_marker_o'] = $widthmarker;
$this->subplots[$i][$j]->cfg['height_marker_o'] = $widthmarker;
$this->subplots[$i][$j]->cfg['ymarginleftlabel'] = 10;
$arrdatasetcolj = $this->math->arrdatasetcol($dataset, $j, 1); // 1 = skip 1 row that is the name fields
if( $i == $j){
$this->subplots[$i][$j]->hist( $arrdatasetcolj );
} else {
$arrdatasetcoli = $this->math->arrdatasetcol($dataset, $i, 1); // 1 = skip 1 row that is the name fields
$arr_values = [ [ $arrdatasetcolj, $arrdatasetcoli ] ];
$this->subplots[$i][$j]->scatter( $arr_values );
}
if( $j==0 ){
$this->subplots[$i][$j]->ylabel( $dataset[0][$i] );
}
if( $i==$numcols-1 ){
$this->subplots[$i][$j]->xlabel( $dataset[0][$j] );
}
}
}
unset( $colnames );
unset( $numcols );
unset( $numrows );
unset( $i );
unset( $j );
} // /pairplot()
}// /php_plotlib
?>