/**
* creates bar chart of given data
* @param array $data data input
* @param int $width graphic width
* @param int $height graphic height
* @param int $barPadding spacing between bars
* @param array $dcolors colors of data fields
* @param int $zLine a "zero" line
* @param array $legende caption
*/
public function barChart($data, $width, $height, $barPadding, $dsColors, $zLine = null, $legende = null)
{
$this->data = $data;
$this->numSets = count($data);
$this->width = $width;
$this->height = $height;
$this->barPadding = $barPadding;
$this->colors = $dsColors;
$this->dsLen = count($this->data[0]);
if (isset($legende)) {
$this->legende = $legende;
} else {
unset($this->legende);
}
if (isset($zLine)) {
$this->zLine = $zLine;
} else {
unset($this->zLine);
}
// count data to find out width of single bar
$num = 0;
// number of bars
$maxY = 0;
// highest value
$minY = 0;
// lowest value
foreach ($this->data as $dp) {
$num += count($dp);
if (count($dp) != $this->dsLen) {
echo "Datasets sind verschieden lang!!";
// Datasets are of different length
pre($dp);
}
// search for maximum value
$max = max($dp);
$min = min($dp);
if ($max > $maxY) {
$maxY = $max;
}
if ($min < $minY) {
$minY = $min;
}
}
$pl = abs($minY);
$h = $maxY + $pl;
// mix up Arrays to group datasets
if ($this->numSets > 1) {
$i = 0;
while ($i != $this->dsLen) {
foreach ($this->data as $dp) {
$dsAll[] = $dp[$i];
}
$i++;
}
} else {
$dsAll = $this->data[0];
}
// numSets to gain double padding between groups
$groupPadding = 4 * $this->barPadding;
$padAll = $num * $this->barPadding + ($this->numSets - 1) * $groupPadding;
$wBar = ($this->width - $padAll) / $num;
// Init Image handle
parent::Init($this->width + 1, $this->height, "bars");
parent::imgFill("white", 1, 1);
$i = 0;
// number overall
$b = 0;
// to arrange groups
$d = 0;
// to pick color
$offs = 0;
// offset is needed for spacing between groups
$yz = $this->height - ($this->zLine + $pl) * ($this->height / $h);
// Zero Line
foreach ($dsAll as $p) {
if ($b == $this->dsLen && $this->numSets != 1) {
// next group ...
$offs += $groupPadding;
// ... -> increase offset
$b = 0;
}
if ($d == $this->numSets) {
$d = 0;
}
$x = round($i * $wBar + $i * $this->barPadding + $offs);
$y = round($p * ($this->height / $h)) - $this->zLine;
parent::imgRect($x, $yz, $wBar, -$y, $this->colors[$d], "filled");
$i++;
$b++;
$d++;
}
if (isset($this->zLine)) {
$y = $this->height - ($this->zLine + $pl) * ($this->height / $h);
parent::imgLine(0, $y, $this->width, $y, "black");
}
if (isset($this->legende)) {
$xw = 20;
$yh = imagefontheight(2) + 2;
parent::imgLine(0, $this->height - 1, $this->width, $this->height - 1, "black");
parent::Init($this->width + 1, $yh, "legendeY");
parent::imgFill("white", 1, 1);
$i = 1;
foreach ($this->legende as $txt) {
$center = $this->width / $this->numSets;
$fw = imagefontwidth(2) * strlen($txt);
$x = $center * $i - $fw / 2 - $center / 2;
parent::imgString(2, $x, 1, $txt, "black");
$lx = $center * $i;
parent::imgLine($lx, 0, $lx, 5, "black");
$i++;
}
$fh = imagefontheight(2);
if ($this->height > $fh * 2) {
parent::Init($xw, $this->height + $yh, "legendeX");
parent::imgFill("white", 1, 1);
parent::imgLine($xw - 1, 0, $xw - 1, $this->height - 1, "black");
parent::imgString(2, 2, -3, $maxY, "black");
parent::imgString(2, 2, $this->height - $fh, 0, "black");
} else {
$xw = 0;
}
parent::Init($this->width + 1 + $xw, $this->height + $yh, "container");
parent::imgFill("white", 1, 1);
@parent::mergeHandles("container", "legendeX", 0, 0);
parent::mergeHandles("container", "bars", $xw, 0);
parent::mergeHandles("container", "legendeY", $xw, $this->height);
parent::switchHandle("container");
}
}
