90 lines
2.1 KiB
PHP
90 lines
2.1 KiB
PHP
<?php
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// {{{ICINGA_LICENSE_HEADER}}}
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// {{{ICINGA_LICENSE_HEADER}}}
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namespace Icinga\Chart\Graph;
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use DOMElement;
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use Icinga\Chart\Primitive\Drawable;
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use Icinga\Chart\Render\RenderContext;
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/**
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* Graph implementation that stacks several graphs and displays them in a cumulative way
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*/
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class StackedGraph implements Drawable
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{
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/**
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* All graphs displayed in this stackedgraph
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*
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* @var array
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*/
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private $stack = array();
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/**
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* An associative array containing x points as the key and an array of y values as the value
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*
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* @var array
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*/
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private $points = array();
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/**
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* Add a graph to this stack and aggregate the values on the fly
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*
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* This modifies the dataset as a side effect
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*
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* @param array $subGraph
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*/
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public function addGraph(array &$subGraph)
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{
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foreach ($subGraph['data'] as &$point) {
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$x = $point[0];
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if (!isset($this->points[$x])) {
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$this->points[$x] = 0;
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}
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// store old y-value for displaying the actual (non-aggregated)
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// value in the tooltip
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$point[2] = $point[1];
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$this->points[$x] += $point[1];
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$point[1] = $this->points[$x];
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}
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}
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/**
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* Add a graph to the stack
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*
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* @param $graph
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*/
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public function addToStack($graph)
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{
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$this->stack[] = $graph;
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}
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/**
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* Empty the stack
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*
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* @return bool
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*/
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public function stackEmpty()
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{
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return empty($this->stack);
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}
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/**
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* Render this stack in the correct order
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*
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* @param RenderContext $ctx The context to use for rendering
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*
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* @return DOMElement The SVG representation of this graph
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*/
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public function toSvg(RenderContext $ctx)
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{
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$group = $ctx->getDocument()->createElement('g');
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$renderOrder = array_reverse($this->stack);
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foreach ($renderOrder as $stackElem) {
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$group->appendChild($stackElem->toSvg($ctx));
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}
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return $group;
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}
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}
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