guess you already had the Idea of this class. It create a Dynamic Bar Chart of your Dynamic Report, This class can be used for Finance Report, Site Log Report, or any other application that need Bar Chart Auto Generation

By : hermawan

<?php
/***
Class Name : easyChart Class
Purpose : Create Simple Bar Chart for Statistic
Input : Retrieved Data from DB
Author : Hermawan Haryanto
Email : hermawan@codewalkers.com
Website : http://hermawan.com
Create Date: Sept 28 2001
Update Date: Nov 27 2002
***/
class easyChart {
var $title;
var $width;
var $height;
var $bartitle;
var $barheight;
var $barwidth;
var $background;
var $multiply;
var $spacebar;
var $leftspace;
var $rightspace;
var $upspace;
var $bottomspace;
var $leftlegend;
var $linecolor;
var $barcolor;
var $titlecolor;
var $legendcolor;
var $barinfocolor;
function easyChart () {
$this->title = "Chart Title";
$this->background = Array(153,204,102);
$this->linecolor = Array(240,240,240);
$this->barcolor = Array(255,255,153);
$this->titlecolor = Array(111,166,55);
$this->legendcolor = Array(0,0,0);
$this->barinfocolor = Array(0,0,0);
$this->width = 600;
$this->height = 500;
$this->barwidth = 20;
$this->leftspace = 75;
$this->rightspace = 25;
$this->upspace = 50;
$this->bottomspace = 50;
$this->leftlegend = 10;
$this->chartlegend = "UG93ZXJlZCBieTogSGVyb";
}
function setTitleColor ($color) {
$this->titlecolor = explode(",",$color);
}
function setLegendColor ($color) {
$this->legendcolor = explode(",",$color);
}
function setBarInfoColor ($color) {
$this->barinfocolor = explode(",",$color);
}
function setBarColor ($color) {
$this->barcolor = explode(",",$color);
}
function setLineColor ($color) {
$this->linecolor = explode(",",$color);
}
function setLeftLegend ($leftlegend) {
$this->leftlegend = $leftlegend;
}
function setLeftSpace ($leftspace) {
$this->leftspace = $leftspace;
}
function setRightSpace ($rightspace) {
$this->rightspace = $rightspace;
}
function setTitle ($title) {
$this->title = $title;
}
function setBackground ($color) {
$this->background = explode (",", $color);
}
function setWidth ($width) {
$this->width = $width;
}
function setHeight ($height) {
$this->height = $height;
}
function setBarWidth ($barwidth) {
$this->barwidth = $barwidth;
}
function addBar ($bartitle, $barheight) {
$this->bartitle[] = $bartitle;
$this->barheight[] = $barheight;
}
function prepare() {
$this->chartlegend .= "WF3YW4gSGFyeWFudG8gZWFzeUNoYXJ0LmNs";
$arr = $this->barheight;
sort ($arr);
reset ($arr);
$this->highestvalue = end($arr);
$this->valueincriement = $this->highestvalue / $this->leftlegend;
$this->multiply = ( ($this->height-($this->upspace + $this->bottomspace)) / $this->highestvalue);
$this->spacebar = ( ($this->width - ($this->leftspace + $this->rightspace)) - ($this->barwidth * count($arr) ) ) / (count($arr)+1);
$this->legendspace = ($this->height - ($this->upspace+$this->bottomspace)) / $this->leftlegend;
if ($this->barwidth * count($this->barheight) > ($this->width-($this->upspace+$this->bottomspace))) $err = "Bar width is to large";
if ($err!="") {
print $err;
exit;
}
}
function generateChart() {
$im = ImageCreate($this->width,$this->height);
$white = ImageColorAllocate($im,255,255,255);
$background = ImageColorAllocate($im,$this->background[0],$this->background[1],$this->background[2]);
$black = ImageColorAllocate($im,0,0,0);
$gray = ImageColorAllocate($im,100,100,100);
$linecolor = ImageColorAllocate($im,$this->linecolor[0],$this->linecolor[1],$this->linecolor[2]);
$barcolor = ImageColorAllocate($im,$this->barcolor[0],$this->barcolor[1],$this->barcolor[2]);
$titlecolor = ImageColorAllocate($im,$this->titlecolor[0],$this->titlecolor[1],$this->titlecolor[2]);
$legendcolor = ImageColorAllocate($im,$this->legendcolor[0],$this->legendcolor[1],$this->legendcolor[2]);
$barinfocolor = ImageColorAllocate($im,$this->barinfocolor[0],$this->barinfocolor[1],$this->barinfocolor[2]);
@ImageFilledRectangle($im,0,25,$this->width,$this->height-15,$background);
@ImageFilledRectangle($im,1,26,$this->width-2,$this->height-16,$white);
@ImageFilledRectangle($im,2,27,$this->width-3,$this->height-17,$background);
@ImageFilledRectangle($im,$this->leftspace,$this->upspace-10,$this->width-$this->rightspace,$this->height-($this->bottomspace-20),$white);
$titlewidth = strlen($this->title) * ImageFontWidth(5);
$titlexpos = ($this->width - $titlewidth)/2;
@ImageString ($im, 5, $titlexpos, 5, $this->title, $titlecolor);
@ImageString ($im, 1, 0, $this->height - 10, base64_decode($this->chartlegend."YXNzIC0gaHR0cDovL2hlcm1hd2FuLmRtb25zdGVyLmNvbSAtIEdQTA=="), $black);
for($i=0;$i<=$this->leftlegend;$i++){
$legendx = 5;
$legendy = $this->upspace + ($this->legendspace * $i) - 6;
@ImageString($im, 2, $legendx, $legendy, $this->highestvalue-($this->valueincriement*$i), $legendcolor);
@ImageLine ($im, $this->leftspace, $legendy+6, $this->width - $this->rightspace, $legendy+6, $linecolor);
}
for($i=0;$i<count($this->barheight);$i++){
$j=$i+1;
$x1 = ($j * $this->spacebar) + ($i * $this->barwidth) + $this->leftspace;
$y1 = $this->height - ($this->barheight[$i]*$this->multiply) - $this->upspace;
$x2 = $x1 + $this->barwidth;
$y2 = $this->height - $this->bottomspace;
$bartitlewidth = strlen($this->bartitle[$i]) * ImageFontWidth(2);
$centerofbar = $x1 + ($this->barwidth / 2);
$bartitlex = $centerofbar - ($bartitlewidth/2);
$bartitley = $y2 + 5;
@ImageFilledRectangle($im, $x1, $y1, $x2, $y2, $barcolor);
@ImageString($im, 2, $bartitlex, $bartitley, $this->bartitle[$i], $barinfocolor);
}
@ImageJPEG($im);
@ImageDestroy($im);
}
};

// HERE IS THE EXAMPLE TO USE THE CHART CLASS
$chart = new easyChart(); // Object initialized
$chart->setTitle("This is my Bar Chart Title"); // Title of Chart
$chart->setBackground("153,204,102"); // Background of chart [opt]
$chart->setLineColor("225,225,225"); // Line color separator [opt]
$chart->setBarColor("255,255,153"); // Bar color [opt]
$chart->setTitleColor("111,166,55"); // Color Title [opt]
$chart->setLegendColor("0,0,0"); // Legend Color [opt]
$chart->setBarInfoColor("0,0,0"); // Bar Info Color [opt]
$chart->setWidth(600); // Width of Chart
$chart->setHeight(500); // Height of Chart
$chart->setBarWidth(20); // Bar Width
$chart->setLeftSpace(75); // Left Space
$chart->setRightSpace(25); // Right Space
$chart->setLeftLegend(10); // Left Legend

$chart->addBar("Jan",12000000); // Sample content of chart
$chart->addBar("Peb",15000000);
$chart->addBar("Mar",10000000);
$chart->addBar("Apr",9000000);
$chart->addBar("Mei",18000000);
$chart->addBar("Jun",12000000);
$chart->addBar("Jul",160000);
$chart->addBar("Ags",14000000);
$chart->addBar("Sept",12000000);
$chart->addBar("Okt",17000000);
$chart->addBar("Nop",14000000);
$chart->addBar("Des",9000000);

$chart->prepare(); // Chart Preparation
$chart->generateChart(); // Chart Generation
?>

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