<?php
/*
Created by David Frendin, 2011
Published at http://www.phpclasses.org/
This class is considered public domain by author as is.
:: Version history
1.0.1 Fixed issues with possible file locks and real numbers, credits to Jaroslav
1.0.0 Initial release
:: Usage
See samples included with this package, or download them from phpclasses.
:: Contact the author
david.frendin@gmail.com
*/
class TinyPie
{
/*
Private properties
*/
private $values;
private $width;
private $height;
private $gdimage;
/*
Constructor
*/
public function __construct($size)
{
$this->width = $size;
$this->height = $size;
$this->gdimage = imagecreatetruecolor($this->width, $this->height);
imagealphablending($this->gdimage, true);
$this->values = array();
}
/*
Destructor
*/
public function __destruct()
{
imagedestroy($this->gdimage);
}
/*
Static method of GetAsImg
*/
public static function QuickImg($size, $values)
{
$g = new TinyPie($size);
foreach ($values as $value)
{
$g->AddValue($value[0], $value[1]);
}
return $g->GetAsImg();
}
/*
Static method of GetAsDiv
*/
public static function QuickDiv($size, $values)
{
$g = new TinyPie($size);
foreach ($values as $value)
{
$g->AddValue($value[0], $value[1]);
}
return $g->GetAsDiv();
}
/*
Add values to graph, includes numeric value and a color representation
*/
public function AddValue($value, $color)
{
$c = imagecolorallocate($this->gdimage, hexdec(substr($color, 0, 2)), hexdec(substr($color, 2, 2)), hexdec(substr($color, 4, 2)));
$this->values[] = array((int)$value, $c);
}
/*
Generate a div-element with background style set to base64 of image
*/
public function GetAsDiv()
{
return '<div style="background: #fff url(data:image/png;base64,' . $this->GetBase64Image() . ') no-repeat; width: ' . $this->width . 'px; height: ' . $this->height . 'px;"></div>';
}
/*
Generate a img-element with url set to base64 of image
*/
public function GetAsImg()
{
return '<img src="data:image/png;base64,' . $this->GetBase64Image() . '" width="' . $this->width . '" height="' . $this->height . '" alt="" />';
}
/*
Save image to disk instead of generating html elements
*/
public function SaveToFile($filename)
{
$this->InternalRendering();
imagepng($this->gdimage, $filename);
}
/*
Determine the sum of all values
*/
private function SumValues()
{
$sum = 0;
foreach ($this->values as $value)
{
$sum = (int)$sum + (int)$value[0];
}
return (int)$sum;
}
/*
Save temporary image to disk and return its contents as a base64 string
*/
private function GetBase64Image()
{
$tempfile = str_replace (' ', '_', microtime());
$this->SaveToFile($tempfile);
$imgbinary = fread(fopen($tempfile, "r"), filesize($tempfile));
@unlink ($tempfile);
return base64_encode($imgbinary);
}
/*
The actual code that renders the graph
*/
private function InternalRendering()
{
$black = imagecolorallocate($this->gdimage, 0, 0, 0);
imagecolortransparent($this->gdimage, $black);
$sum = $this->SumValues();
$totalcovered = 0;
foreach ($this->values as $value)
{
$step = round((((int)$value[0] / $sum) * 360));
$color = (int)$value[1];
imagefilledarc($this->gdimage, $this->width * 0.5, $this->height * 0.5, $this->width-1, $this->height-1, $totalcovered, $step + (int)$totalcovered, $color, IMG_ARC_PIE);
$totalcovered = $totalcovered + $step;
}
imageantialias($this->gdimage, true);
}
}
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