/**
* Render the legend to an SVG object
*
* @param RenderContext $ctx The context to use for rendering this legend
*
* @return DOMElement The SVG representation of this legend
*/
public function toSvg(RenderContext $ctx)
{
$outer = new Canvas('legend', new LayoutBox(0, 0, 100, 100));
$outer->getLayout()->setPadding(2, 2, 2, 2);
$nrOfColumns = 4;
$topstep = 10 / $nrOfColumns + 2;
$top = 0;
$left = 0;
$lastLabelEndPos = -1;
foreach ($this->dataset as $color => $text) {
$leftstep = 100 / $nrOfColumns + strlen($text);
// Make sure labels don't overlap each other
while ($lastLabelEndPos >= $left) {
$left += $leftstep;
}
// When a label is longer than the available space, use the next line
if ($left + strlen($text) > 100) {
$top += $topstep;
$left = 0;
}
$colorBox = new Rect($left, $top, 2, 2);
$colorBox->setFill($color)->setStrokeWidth(2);
$colorBox->keepRatio();
$outer->addElement($colorBox);
$textBox = new Text($left + 5, $top + 2, $text);
$textBox->setFontSize('2em');
$outer->addElement($textBox);
// readjust layout
$lastLabelEndPos = $left + strlen($text);
$left += $leftstep;
}
$svg = $outer->toSvg($ctx);
return $svg;
}
/**
* Render the SVG-document
*
* @return string The resulting XML structure
*/
public function render()
{
$this->createRootDocument();
$ctx = $this->createRenderContext();
$this->svg->appendChild($this->rootCanvas->toSvg($ctx));
$this->document->formatOutput = true;
return $this->document->saveXML();
}
/**
* Render the content of the graph, i.e. the draw stack
*
* @param Canvas $innerBox The inner canvas of the graph to add the content to
*/
private function renderGraphContent(Canvas $innerBox)
{
foreach ($this->graphs as $axisName => $graphs) {
$axis = $this->axis[$axisName];
$graphObj = null;
foreach ($graphs as $dataset => $graph) {
// determine the type and create a graph object for it
switch ($graph['graphType']) {
case self::TYPE_BAR:
$graphObj = new BarGraph($axis->transform($graph['data']), $graphs, $dataset, $this->tooltips);
break;
case self::TYPE_LINE:
$graphObj = new LineGraph($axis->transform($graph['data']), $graphs, $dataset, $this->tooltips);
break;
default:
continue;
}
$el = $this->setupGraph($graphObj, $graph);
if ($el) {
$innerBox->addElement($el);
}
}
}
}
/**
* Create the content for this PieChart
*
* @param Canvas $innerBox The innerbox to add the clip mask to
*/
private function createContentClipBox(Canvas $innerBox)
{
$clipBox = new Canvas('clip', new LayoutBox(0, 0, 100, 100));
$clipBox->toClipPath();
$innerBox->addElement($clipBox);
$rect = new Rect(0.1, 0, 100, 99.90000000000001);
$clipBox->addElement($rect);
}
