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<?php |
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/** |
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* Copyright (C) 2013-2022 Graham Breach |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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/** |
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* For more information, please contact <graham@goat1000.com> |
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*/ |
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|
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namespace Goat1000\SVGGraph; |
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|
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/** |
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* BubbleGraph - scatter graph with bubbles instead of markers |
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*/ |
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class BubbleGraph extends PointGraph { |
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|
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public function __construct($w, $h, array $settings, array $fixed_settings = []) |
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{ |
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$fs = [ |
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'repeated_keys' => 'accept', |
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'require_integer_keys' => false, |
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'require_structured' => ['area'], |
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]; |
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$fs = array_merge($fs, $fixed_settings); |
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parent::__construct($w, $h, $settings, $fs); |
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} |
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|
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protected function draw() |
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{ |
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$body = $this->grid() . $this->underShapes(); |
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$dataset = $this->getOption(['dataset', 0], 0); |
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|
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$bnum = 0; |
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$y_axis = $this->y_axes[$this->main_y_axis]; |
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$series = ''; |
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|
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foreach($this->values[$dataset] as $item) { |
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$area = $item->area; |
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$x = $this->gridPosition($item, $bnum); |
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$y = null; |
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if($item->value !== null && $x !== null) |
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$y = $this->gridY($item->value); |
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|
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if($y !== null) { |
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$r = $this->getOption('bubble_scale') * $y_axis->unit() * sqrt(abs($area) / M_PI); |
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$circle = ['cx' => $x, 'cy' => $y, 'r' => $r]; |
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$colour = $this->getColour($item, $bnum, $dataset); |
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$circle_style = ['fill' => $colour]; |
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if($area < 0) { |
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// draw negative bubbles with a checked pattern |
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$pattern = [$colour, 'pattern' => 'check', 'size' => 8]; |
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$pid = $this->defs->addPattern($pattern); |
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$circle_style['fill'] = 'url(#' . $pid . ')'; |
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} |
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$this->setStroke($circle_style, $item, $bnum, $dataset); |
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$this->addDataLabel($dataset, $bnum, $circle, $item, |
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$x - $r, $y - $r, $r * 2, $r * 2); |
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|
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if($this->getOption('show_tooltips')) |
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$this->setTooltip($circle, $item, $dataset, $item->key, $area, true); |
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if($this->getOption('show_context_menu')) |
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$this->setContextMenu($circle, $dataset, $item, true); |
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if($this->getOption('semantic_classes')) |
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$circle['class'] = 'series0'; |
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$bubble = $this->element('circle', array_merge($circle, $circle_style)); |
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$series .= $this->getLink($item, $item->key, $bubble); |
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|
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$this->addMarker($x, $y, $item, null, $dataset, false); |
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$this->setLegendEntry($dataset, $bnum, $item, $circle_style); |
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} |
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|
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++$bnum; |
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} |
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|
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$group = []; |
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if($this->getOption('semantic_classes')) |
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$group['class'] = 'series'; |
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$shadow_id = $this->defs->getShadow(); |
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if($shadow_id !== null) |
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$group['filter'] = 'url(#' . $shadow_id . ')'; |
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if(!empty($group)) |
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$series = $this->element('g', $group, null, $series); |
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|
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list($best_fit_above, $best_fit_below) = $this->bestFitLines(); |
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$body .= $best_fit_below; |
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$body .= $series; |
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$body .= $this->overShapes(); |
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$body .= $this->axes(); |
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$body .= $this->drawMarkers(); |
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$body .= $best_fit_above; |
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return $body; |
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} |
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|
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/** |
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* Checks that the data produces a 2-D plot |
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*/ |
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protected function checkValues() |
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{ |
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parent::checkValues(); |
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|
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// using force_assoc makes things work properly |
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if($this->values->associativeKeys()) |
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$this->setOption('force_assoc', true); |
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|
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// prevent drawing actual markers |
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$this->setOption('marker_size', 0); |
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} |
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|
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/** |
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* Return bubble for legend |
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*/ |
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public function drawLegendEntry($x, $y, $w, $h, $entry) |
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{ |
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$bubble = [ |
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'cx' => $x + $w / 2, |
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'cy' => $y + $h / 2, |
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'r' => min($w, $h) / 2 |
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]; |
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return $this->element('circle', array_merge($bubble, $entry->style)); |
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} |
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} |
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|
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|
