PHP : BAR MAKER

/*

The Bar chart generator by Ashish Kasturia (http://www.123ashish.com)
Copyright (C) 2003 Ashish Kasturia (ashish at 123ashish.com)


The Bar chart generator is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
USA.

*/




class Bar
{
var $width = 400;
var $height = 300;
var $bgCol;

var $title = "Bar Graph - 123ashish.com";
var $titleCol;

var $dataValues = array();
var $dataXLabels = array();
var $dataSeriesLabels = array();
var $barCol = array();
var $axesCol;
var $image;

function InitializeColors()
{
$this->bgCol = ImageColorAllocate($this->image, 255, 255, 255);
$this->titleCol = ImageColorAllocate($this->image, 0, 0, 0);

$this->barCol[0] = ImageColorAllocate($this->image, 0, 0, 255);
$this->barCol[1] = ImageColorAllocate($this->image, 0, 255, 0);
$this->barCol[2] = ImageColorAllocate($this->image, 255, 0, 0);
$this->barCol[3] = ImageColorAllocate($this->image, 0, 255, 255);
$this->barCol[4] = ImageColorAllocate($this->image, 255, 0, 255);
$this->barCol[5] = ImageColorAllocate($this->image, 255, 255, 0);
$this->barCol[6] = ImageColorAllocate($this->image, 100, 100, 55);
$this->barCol[7] = ImageColorAllocate($this->image, 55, 100, 100);
$this->barCol[8] = ImageColorAllocate($this->image, 100, 55, 100);

$this->axesCol = ImageColorAllocate($this->image, 200, 200, 200);
}

function Bar()
{
$this->image = ImageCreate($this->width, $this->height);
$this->InitializeColors();
ImageFill($this->image, 0, 0, $this->bgCol);
}

function SetDimensions($width, $height)
{
ImageDestroy($this->image);
$this->height = $height;
$this->width = $width;

$this->image = ImageCreate($this->width, $this->height);
InitializeColors();
ImageFill($this->image, 0, 0, $this->bgCol);
}

function SetBGJPEGImage($file)
{
// SetBGJPEGImage() and SetDimensions() cannot be used together
ImageDestroy($this->image);
$this->image = ImageCreateFromJPEG($file);
$this->width = ImageSX($this->image);
$this->height = ImageSY($this->image);
$this->InitializeColors();
}
function SetBGPngImage($file)
{
// SetBGPngImage() and SetDimensions() cannot be used together
ImageDestroy($this->image);
$this->image = ImageCreateFromPng($file);
$this->width = ImageSX($this->image);
$this->height = ImageSY($this->image);
$this->InitializeColors();
}
function SetBGGifImage($file)
{
// SetBGGifImage() and SetDimensions() cannot be used together
ImageDestroy($this->image);
$this->image = ImageCreateFromGif($file);
$this->width = ImageSX($this->image);
$this->height = ImageSY($this->image);
$this->InitializeColors();
}
function SetBGColor($bgR, $bgG, $bgB)
{
ImageColorDeallocate($this->image, $this->bgCol);
$this->bgCol = ImagecolorAllocate($this->image, $bgR, $bgG, $bgB);
}

function SetTitle($title)
{
$this->title = $title;
}

function SetTitleColor($bgR, $bgG, $bgB)
{
ImageColorDeallocate($this->image, $this->titleCol);
$this->titleCol = ImagecolorAllocate($this->image, $bgR, $bgG, $bgB);
}

function AddValue($xVal, $yVal)
{
// $yVal is an array of y values
$this->dataValues[] = $yVal;
$this->dataXLabels[] = $xVal;
}

function SetSeriesLabels($labels)
{
$this->dataSeriesLabels = $labels;
}

function SetBarColor($bgR, $bgG, $bgB)
{
// ImageColorDeallocate($this->image, $this->barCol);
// $this->barCol = ImagecolorAllocate($this->image, $bgR, $bgG, $bgB);
}

function SetAxesColor($bgR, $bgG, $bgB)
{
ImageColorDeallocate($this->image, $this->axesCol);
$this->axesCol = ImagecolorAllocate($this->image, $bgR, $bgG, $bgB);
}

function spit($type)
{
// spit out the graph

$black = ImageColorAllocate($this->image, 0, 0, 0);

// draw the box
ImageLine($this->image, 0, 0, $this->width - 1, 0, $black);
ImageLine($this->image, $this->width - 1, 0, $this->width - 1, $this->height - 1, $black);
ImageLine($this->image, $this->width - 1, $this->height - 1, 0, $this->height - 1, $black);
ImageLine($this->image, 0, $this->height - 1, 0, 0, $black);

// draw the axes
// Y
for($i = 0; $i <= 4; $i++)
{
$tmpVal = 4 - $i;
$y1 = 40 + (($tmpVal * ($this->height - 80)) / 4);
ImageLine($this->image, 40, $y1, $this->width - 80, $y1, $this->axesCol);
}
// X
ImageLine($this->image, 40, $this->height - 40, 40, 40, $this->axesCol);
ImageLine($this->image, $this->width - 80, $this->height - 40, $this->width - 80, 40, $this->axesCol);

// calculate the max of each range
$tmpArray = Array();
$maxValues = Array();
$numSequences = sizeof($this->dataValues[0]);

for($i = 0; $i < $numSequences; $i++)
{
$tmpArray[$i] = Array();
for($j = 0; $j < sizeof($this->dataValues); $j++)
{
$tmpArray[$i][] = $this->dataValues[$j][$i];
}
}

for($i = 0; $i < $numSequences; $i++)
{
$maxValues[$i] = max($tmpArray[$i]);
}

// put the y axis values
for($i = 0; $i <= 4; $i++)
{
$tmpVal = 4 - $i;
$y1 = 40 + (($i * ($this->height - 80)) / 4);

for($j = 0; $j < $numSequences; $j++)
{
$str = sprintf("%.2f", ($maxValues[$j] * (4 - $i) / 4));
$strHeight = ImageFontHeight(2);
ImageString($this->image, 2, 5, $y1 + (($j - $numSequences / 2) * $strHeight), $str, $this->barCol[$j % 9]);
}
}

// put the title
$titleWidth = ImageFontWidth(3) * strlen($this->title);
ImageString($this->image, 3, ($this->width - $titleWidth) / 2, 10, $this->title, $this->titleCol);

// put the series legend
$legendWidth = ImageFontWidth(3) * strlen("Legend");
ImageString($this->image, 3, $this->width - $legendWidth - 5, 40, "Legend", $this->titleCol);
for($i = 0; $i < sizeof($this->dataSeriesLabels); $i++)
{
$legendWidth = ImageFontWidth(3) * strlen($this->dataSeriesLabels[$i]);
ImageString($this->image, 3, $this->width - $legendWidth - 5, 60 + $i * ImageFontWidth(2) * 2, $this->dataSeriesLabels[$i], $this->barCol[$i % 9]);
}

// divide the area for the values
$xUnit = ($this->width - 120) / sizeof($this->dataValues);

// finally draw the graphs
for($i = 0; $i < sizeof($this->dataValues); $i++)
{
$labelWidth = ImageFontWidth(1) * strlen($this->dataXLabels[$i]);
$labelHeight = ImageFontHeight(1);

ImageString($this->image, 1,
40 + $xUnit * ($i + 0.5) - $labelWidth / 2,
$this->height - 35 + ($i % 2) * $labelHeight,
$this->dataXLabels[$i], $this->titleCol);
$x1Unit = ($xUnit - 10) / sizeof($this->dataValues[$i]);

for($j = 0; $j < sizeof($this->dataValues[$i]); $j++)
{
$x1 = 40 + ($xUnit * $i) + 5 + ($x1Unit * $j);
$x2 = 40 + ($xUnit * $i) + 5 + ($x1Unit * ($j + 1));

// $maxValues[$j] corresponds to $this->height - 80
$tmpVal = $maxValues[$j] - $this->dataValues[$i][$j];
// $tmpVal corresponds to ($tmpVal * ($this->height - 80)) / $maxValues[$j];
$y1 = 40 + (($tmpVal * ($this->height - 80)) / $maxValues[$j]);
$y2 = $this->height - 40;
ImageFilledRectangle($this->image, $x1, $y1, $x2, $y2, $this->barCol[$j % 9]);
}
}

if($type == "jpg")
{
Header("Content-type: image/jpeg");
ImageJpeg($this->image);
}
if($type == "png")
{
Header("Content-type: image/png");
ImagePng($this->image);
}
if($type == "gif")
{
Header("Content-type: image/gif");
ImageGif($this->image);
}

ImageDestroy($this->image);

}
}


?>