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Graph.php
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Graph.php
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<?php
/**
* Copyright (C) 2019-2023 Graham Breach
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* For more information, please contact <graham@goat1000.com>
*/
namespace Goat1000\SVGGraph;
/**
* Base class for all graph types
*/
abstract class Graph {
public $subgraph = false;
protected $width = 0;
protected $height = 0;
protected $pad_left = 0;
protected $pad_right = 0;
protected $pad_top = 0;
protected $pad_bottom = 0;
protected $settings = [];
protected $values = [];
protected $namespace = false;
protected $link_base = '';
protected $link_target = '_blank';
protected $links = [];
public $encoding = 'UTF-8';
protected $colours = null;
public $defs = null;
public $figures = null;
protected $subgraphs = [];
protected $back_matter = '';
protected $namespaces = [];
private static $last_id = 0;
public static $key_format = null;
protected $legend = null;
protected $data_label_style_cache = [];
protected $multi_graph;
private static $javascript = null;
private $data_labels = null;
private $context_menu = null;
private $shapes = null;
/**
* @arg $w = width
* @arg $h = height
* @arg $settings = user options
* @arg $fixed_settings = class options overriding user options
*/
public function __construct($w, $h, array $settings, array $fixed_settings = [])
{
$this->width = $w;
$this->height = $h;
$this->defs = new Defs($this);
// get settings from ini file that are relevant to this class
$class = get_class($this);
$ini_settings = $this->ini_settings($class);
// default option overrides - subclasses can override these
$fixed_setting_defaults = [
'repeated_keys' => 'error',
'sort_keys' => true,
'require_structured' => false,
'require_integer_keys' => true,
];
$this->settings = array_merge($this->settings, $ini_settings, $settings,
$fixed_setting_defaults, $fixed_settings);
// set up figures - it can't be dynamic because figures can refer
// to other figures via Markers
$this->figures = new Figures($this, $this->settings);
// copy some settings to member variables
$opts = ['namespace', 'link_base', 'link_target', 'encoding',
'pad_top', 'pad_bottom', 'pad_left', 'pad_right'];
foreach($opts as $opt)
$this->{$opt} = $this->getOption($opt);
}
/**
* Deprecated option/member access - display error and fail
*/
public function __get($name)
{
trigger_error('Attempt to get $this->' . $name, E_USER_WARNING);
debug_print_backtrace(0, 1);
exit;
}
public function __isset($name)
{
trigger_error('Isset attempt on option $this->' . $name, E_USER_WARNING);
debug_print_backtrace(0, 1);
exit;
}
public function __set($name, $value)
{
trigger_error('Attempt to set $this->' . $name, E_USER_WARNING);
debug_print_backtrace(0, 1);
exit;
}
/**
* Returns the settings from the ini file for a class
*/
protected function ini_settings($class)
{
$ini_file = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'svggraph.ini';
$ini_settings = false;
if(file_exists($ini_file))
$ini_settings = parse_ini_file($ini_file, true);
if($ini_settings === false)
throw new \Exception('INI file [' . $ini_file . '] could not be loaded');
$hierarchy = [$class];
while($class = get_parent_class($class))
array_unshift($hierarchy, $class);
$settings = [];
while(count($hierarchy)) {
$class = array_shift($hierarchy);
$ns = strrpos($class, '\\');
$class = substr($class, $ns + 1);
if(array_key_exists($class, $ini_settings))
$settings = array_merge($settings, $ini_settings[$class]);
}
return $settings;
}
/**
* Sets the graph values
*/
public function values($values)
{
$new_values = [];
$v = func_get_args();
if(count($v) == 1)
$v = array_shift($v);
$set_values = true;
if(is_array($v)) {
reset($v);
$first_key = key($v);
if($first_key !== null && is_array($v[$first_key])) {
foreach($v as $data_set)
$new_values[] = $data_set;
$set_values = false;
}
}
if($set_values)
$new_values[] = $v;
$require_structured = $this->getOption('require_structured');
$structured_data = $this->getOption('structured_data');
$structure = $this->getOption('structure');
$datetime_keys = $this->getOption('datetime_keys');
$datetime_key_format = $this->getOption('datetime_key_format');
$force_assoc = $this->getOption('force_assoc');
if($this->getOption('scatter_2d')) {
$this->setOption('scatter_2d', false);
if(empty($structure)) {
$structure = ['key' => 0, 'value' => 1, 'datasets' => true];
$this->setOption('structure', $structure);
}
}
if($datetime_keys && $datetime_key_format)
Graph::$key_format = $datetime_key_format;
if($structured_data || is_array($structure)) {
$this->setOption('structured_data', true);
$this->values = new StructuredData($new_values, $force_assoc,
$datetime_keys, $structure,
$this->getOption('repeated_keys'), $this->getOption('sort_keys'),
$this->getOption('require_integer_keys'), $require_structured);
} else {
$this->values = new Data($new_values, $force_assoc, $datetime_keys);
if(!$this->values->error && !empty($require_structured))
$this->values->error = get_class($this) . ' requires structured data';
}
if($this->values->error)
return;
$dataset = $this->getOption('dataset', 0);
if($dataset === 0)
return;
$dcount = count($this->values);
$dataset = $this->getOption(['dataset', 0], 0);
if($dcount <= $dataset) {
$this->values->error = 'No valid datasets selected';
return;
}
// dataset option doesn't work well without structured data
$this->values = StructuredData::convertFrom($this->values, $force_assoc,
$datetime_keys, $this->getOption('require_integer_keys'));
}
/**
* Sets the links from each item
*/
public function links()
{
$this->links = func_get_args();
}
/**
* Assigns the list of subgraphs
*/
public function subgraphs($subgraphs)
{
$this->subgraphs = $subgraphs;
}
/**
* Set up the colours
*/
public function colours(Colours $colours)
{
$this->colours = $colours;
}
public function getMinValue()
{
$d = $this->getOption(['dataset', 0], 0);
return $this->values->getMinValue($d);
}
public function getMaxValue()
{
$d = $this->getOption(['dataset', 0], 0);
return $this->values->getMaxValue($d);
}
public function getMinKey()
{
$d = $this->getOption(['dataset', 0], 0);
return $this->values->getMinKey($d);
}
public function getMaxKey()
{
$d = $this->getOption(['dataset', 0], 0);
return $this->values->getMaxKey($d);
}
public function getKey($i)
{
return $this->values->getKey($i);
}
/**
* Sets up the colours used for the graph
*/
protected function setup()
{
$dataset = $this->getOption(['dataset', 0], 0);
$this->colourSetup($this->values->itemsCount($dataset));
}
/**
* Returns the Javascript instance
*/
public function getJavascript()
{
if(!isset(Graph::$javascript))
Graph::$javascript = new Javascript($this);
return Graph::$javascript;
}
/**
* Returns the DataLabels instance
*/
public function getDataLabels()
{
if($this->data_labels === null)
$this->data_labels = new DataLabels($this);
return $this->data_labels;
}
/**
* Draws the selected graph
*/
public function drawGraph()
{
$canvas_id = $this->newID();
$this->initLegend();
$this->setup();
if(!is_numeric($this->width))
$this->width = 640;
if(!is_numeric($this->height))
$this->height = 480;
$contents = $this->canvas($canvas_id);
$contents .= $this->drawTitle();
$contents .= $this->draw();
$contents .= $this->drawDataLabels();
$contents .= $this->drawBackMatter();
$contents .= $this->drawLegend();
foreach($this->subgraphs as $subgraph)
$contents .= $subgraph->fetch($this);
// magnifying means everything must be in a group for transformation
if(!$this->subgraph && $this->getOption('magnify')) {
$this->getJavascript()->magnifier();
$group = ['class' => 'svggraph-magnifier'];
$contents = $this->element('g', $group, null, $contents);
}
// rounded rects might need a clip path
if($this->getOption('back_round') && $this->getOption('back_round_clip')) {
$group = ['clip-path' => 'url(#' . $canvas_id . ')'];
return $this->element('g', $group, null, $contents);
}
return $contents;
}
/**
* Adds any markup that goes after the graph
*/
protected function drawBackMatter()
{
return $this->back_matter;
}
/**
* Sets up the legend class
*/
protected function initLegend()
{
$this->legend = null;
// see if the legend is needed
if(!$this->getOption('show_legend'))
return;
$entries = $this->getOption('legend_entries');
$structure = $this->getOption('structure');
if(empty($entries) && !isset($structure['legend_text']))
return;
$this->legend = new Legend($this);
}
/**
* Returns the ordering for legend entries
*/
public function getLegendOrder()
{
// null for no special order
return null;
}
/**
* Draws the legend
*/
protected function drawLegend()
{
if($this->legend === null)
return '';
return $this->legend->draw();
}
/**
* Parses a position string, returning x and y coordinates
*/
public function parsePosition($pos, $w = 0, $h = 0, $pad = 0)
{
$inner = true;
$parts = preg_split('/\s+/', $pos);
if(count($parts)) {
// if 'outer' is found after 'inner', it takes precedence
$parts = array_reverse($parts);
$inner_at = array_search('inner', $parts);
$outer_at = array_search('outer', $parts);
if($outer_at !== false && ($inner_at === false || $inner_at < $outer_at))
$inner = false;
}
if($inner) {
$t = $this->pad_top;
$l = $this->pad_left;
$b = $this->height - $this->pad_bottom;
$r = $this->width - $this->pad_right;
// make sure it fits to keep RelativePosition happy
if($w > $r - $l) $w = $r - $l;
if($h > $b - $t) $h = $b - $t;
} else {
$t = $l = 0;
$b = $this->height;
$r = $this->width;
}
// ParsePosition is always inside canvas or graph, defaulted to top left
$pos = 'top left ' . str_replace('outer', 'inner', $pos);
return Graph::relativePosition($pos, $t, $l, $b, $r, $w, $h, $pad);
}
/**
* Returns [hpos,vpos,offset_x,offset_y] positions derived from full
* position string
*/
public static function translatePosition($pos)
{
$parts = preg_split('/\s+/', strtolower($pos));
$offset_x = $offset_y = 0;
$inside = true;
$vpos = 'm';
$hpos = 'c';
// translated positions:
// ot, t, m, b, ob = outside top, top, middle, bottom, outside bottom
// ol, l, c, r, or = outside left, left, centre, right, outside right
while(count($parts)) {
$part = array_shift($parts);
switch($part) {
case 'outer' :
case 'outside' : $inside = false;
break;
case 'inner' :
case 'inside' : $inside = true;
break;
case 'top' : $vpos = $inside ? 't' : 'ot';
break;
case 'bottom' : $vpos = $inside ? 'b' : 'ob';
break;
case 'left' : $hpos = $inside ? 'l' : 'ol';
break;
case 'right' : $hpos = $inside ? 'r' : 'or';
break;
case 'above' : $inside = false; $vpos = 'ot';
break;
case 'below' : $inside = false; $vpos = 'ob';
break;
default:
if(is_numeric($part)) {
$offset_x = $part;
if(count($parts) && is_numeric($parts[0]))
$offset_y = array_shift($parts);
}
}
}
return [$hpos, $vpos, $offset_x, $offset_y];
}
/**
* Returns [x,y,text-anchor,hpos,vpos] position that is $pos relative to the
* top, left, bottom and right.
* When $text is true, x and y are adjusted for text-anchor position
*/
public static function relativePosition($pos, $top, $left,
$bottom, $right, $width, $height, $pad, $text = false)
{
list($hpos, $vpos, $offset_x, $offset_y) = Graph::translatePosition($pos);
// if the containers have no thickness, position outside
$translate = ['l' => 'ol', 'r' => 'or', 't' => 'ot', 'b' => 'ob'];
if($top == $bottom && isset($translate[$vpos]))
$vpos = $translate[$vpos];
if($left == $right && isset($translate[$hpos]))
$hpos = $translate[$hpos];
switch($vpos) {
case 'ot' : $y = $top - $height - $pad; break;
case 't' : $y = $top + $pad; break;
case 'b' : $y = $bottom - $height - $pad; break;
case 'ob' : $y = $bottom + $pad; break;
case 'm' :
default :
$y = $top + ($bottom - $top - $height) / 2; break;
}
if(($hpos == 'r' || $hpos == 'l') && $right - $left - $pad - $width < 0)
$hpos = 'c';
switch($hpos) {
case 'ol' : $x = $left - $width - $pad; break;
case 'l' : $x = $left + $pad; break;
case 'r' : $x = $right - $width - $pad; break;
case 'or' : $x = $right + $pad; break;
case 'c' :
default :
$x = $left + ($right - $left - $width) / 2; break;
}
$y += $offset_y;
$x += $offset_x;
// third return value is text alignment
$align_map = [
'ol' => 'end', 'l' => 'start', 'c' => 'middle',
'r' => 'end', 'or' => 'start'
];
$text_align = $align_map[$hpos];
// in text mode, adjust X for text alignment
if($text && $hpos != 'l' && $hpos != 'or') {
if($hpos == 'c')
$x += $width / 2;
else
$x += $width;
}
return [$x, $y, $text_align, $hpos, $vpos];
}
/**
* Sets the style info for the legend
*/
protected function setLegendEntry($dataset, $index, $item, $style_info)
{
if($this->legend === null)
return;
$this->legend->setEntry($dataset, $index, $item, $style_info);
}
/**
* Subclasses must draw the entry, if they can
*/
protected function drawLegendEntry($x, $y, $w, $h, $entry)
{
return '';
}
/**
* Returns details of title and subtitle
*/
protected function getTitle()
{
$info = [
'title' => $this->getOption('graph_title'),
'font' => $this->getOption('graph_title_font'),
'font_size' => 0, // 0 font size = no title
'sfont_size' => 0, // 0 = no subtitle
];
$svg_text = new Text($this, $info['font']);
if($svg_text->strlen($info['title']) <= 0)
return $info;
$info['font_size'] = Number::units($this->getOption('graph_title_font_size'));
$info['weight'] = $this->getOption('graph_title_font_weight');
$info['colour'] = $this->getOption('graph_title_colour');
$info['pos'] = $this->getOption('graph_title_position');
$info['space'] = $this->getOption('graph_title_space');
$info['line_spacing'] = Number::units($this->getOption('graph_title_line_spacing'));
if($info['line_spacing'] === null || $info['line_spacing'] < 1)
$info['line_spacing'] = $info['font_size'];
if($info['pos'] != 'bottom' && $info['pos'] != 'left' && $info['pos'] != 'right')
$info['pos'] = 'top';
list($width, $height) = $svg_text->measure($info['title'], $info['font_size'],
0, $info['line_spacing']);
$info['width'] = $width;
$info['height'] = $height;
// now deal with sub-title
$info['stitle'] = $this->getOption('graph_subtitle');
$info['sfont'] = $this->getOption('graph_subtitle_font', 'graph_title_font');
$svg_subtext = new Text($this, $info['sfont']);
if($svg_subtext->strlen($info['stitle']) > 0) {
$info['sfont_size'] = Number::units($this->getOption('graph_subtitle_font_size',
'graph_title_font_size'));
$info['sweight'] = $this->getOption('graph_subtitle_font_weight',
'graph_title_font_weight');
$info['scolour'] = $this->getOption('graph_subtitle_colour',
'graph_title_colour');
$info['sspace'] = $this->getOption('graph_subtitle_space',
'graph_title_space');
$info['sline_spacing'] = Number::units($this->getOption('graph_subtitle_line_spacing'));
if($info['sline_spacing'] === null || $info['sline_spacing'] < 1)
$info['sline_spacing'] = $info['sfont_size'];
list($swidth, $sheight) = $svg_subtext->measure($info['stitle'],
$info['sfont_size'], 0, $info['sline_spacing']);
$info['swidth'] = $swidth;
$info['sheight'] = $sheight;
}
return $info;
}
/**
* Draws the graph title, if there is one
*/
protected function drawTitle()
{
$info = $this->getTitle();
if($info['font_size'] == 0)
return '';
$svg_text = new Text($this, $info['font']);
$baseline = $svg_text->baseline($info['font_size']);
$text = [
'font-size' => $info['font_size'],
'font-family' => $info['font'],
'font-weight' => $info['weight'],
'text-anchor' => 'middle',
'fill' => new Colour($this, $info['colour']),
];
// ensure outside padding is at least the title space
$pad_side = 'pad_' . $info['pos'];
if($this->{$pad_side} < $info['space'])
$this->{$pad_side} = $info['space'];
$xform = new Transform;
switch($info['pos']) {
case 'left':
$text['x'] = $this->pad_left + $baseline;
$text['y'] = $this->height / 2;
$xform->rotate(270, $text['x'], $text['y']);
$text['transform'] = $xform;
break;
case 'right':
$text['x'] = $this->width - $this->pad_right - $baseline;
$text['y'] = $this->height / 2;
$xform->rotate(90, $text['x'], $text['y']);
$text['transform'] = $xform;
break;
case 'bottom':
$text['x'] = $this->width / 2;
$text['y'] = $this->height - $this->pad_bottom - $info['height'] + $baseline;
break;
default:
$text['x'] = $this->width / 2;
$text['y'] = $this->pad_top + $baseline;
}
// increase padding by size of text
$this->{$pad_side} += $info['height'] + $info['space'];
// now deal with sub-title
$subtitle_text = '';
if($info['sfont_size'] != 0) {
$svg_subtext = new Text($this, $info['sfont']);
$sbaseline = $svg_subtext->baseline($info['sfont_size']);
$stext = [
'font-size' => $info['sfont_size'],
'font-family' => $info['sfont'],
'font-weight' => $info['sweight'],
'text-anchor' => 'middle',
'fill' => new Colour($this, $info['scolour']),
];
$sxform = new Transform;
$sub_offset = $sbaseline + $info['sspace'] - $info['space'];
switch($info['pos']) {
case 'left':
$stext['x'] = $this->pad_left + $sub_offset;
$stext['y'] = $text['y'];
$sxform->rotate(270, $stext['x'], $stext['y']);
$stext['transform'] = $sxform;
break;
case 'right':
$stext['x'] = $this->width - $this->pad_right - $sub_offset;
$stext['y'] = $text['y'];
$sxform->rotate(90, $stext['x'], $stext['y']);
$stext['transform'] = $sxform;
break;
case 'bottom':
// complicates things - need to shift title up
$stext['x'] = $text['x'];
$stext['y'] = $text['y'] - $baseline + $info['height'] + $sbaseline - $info['sheight'];
$text['y'] -= $info['sheight'] + $info['sspace'];
break;
default:
$stext['x'] = $text['x'];
$stext['y'] = $this->pad_top + $sub_offset;
}
$this->{$pad_side} += $info['sheight'] + $info['sspace'];
$subtitle_text = $svg_subtext->text($info['stitle'], $info['sline_spacing'], $stext);
}
// the Text function will break it into lines
$title_text = $svg_text->text($info['title'], $info['line_spacing'], $text);
return $title_text . $subtitle_text;
}
/**
* This should be overridden by subclass!
*/
abstract protected function draw();
/**
* Displays the background image
*/
protected function backgroundImage($shadow, $clip_path)
{
$image_src = $this->getOption('back_image');
if(!$image_src)
return '';
$width = $this->getOption('back_image_width');
$height = $this->getOption('back_image_height');
$left = $this->getOption('back_image_left');
$top = $this->getOption('back_image_top');
$mode = $this->getOption('back_image_mode');
if($shadow) {
if($width === '100%')
$width = new Number($this->width - $shadow);
if($height === '100%')
$height = new Number($this->height - $shadow);
}
$image = [
'width' => $width, 'height' => $height,
'x' => $left, 'y' => $top,
'xlink:href' => $image_src,
'preserveAspectRatio' =>
($mode == 'stretch' ? 'none' : 'xMinYMin')
];
if($clip_path !== null)
$image['clip-path'] = 'url(#' . $clip_path . ')';
$style = [];
if($this->getOption('back_image_opacity'))
$style['opacity'] = $this->getOption('back_image_opacity');
$contents = '';
if($mode == 'tile') {
$image['x'] = 0; $image['y'] = 0;
$im = $this->element('image', $image, $style);
$pattern = [
'id' => $this->newID(),
'width' => $width, 'height' => $height,
'x' => $left, 'y' => $top,
'patternUnits' => 'userSpaceOnUse'
];
// tiled image becomes a pattern to replace background colour
$this->defs->add($this->element('pattern', $pattern, null, $im));
$this->setOption('back_colour', 'url(#' . $pattern['id'] . ')');
} else {
$im = $this->element('image', $image, $style);
$contents .= $im;
}
return $contents;
}
/**
* Displays the background
*/
protected function canvas($id)
{
$round = $this->getOption('back_round');
$stroke_width = $this->getOption('back_stroke_width');
$stroke_colour = new Colour($this, $this->getOption('back_stroke_colour'));
$shadow_opacity = $this->getOption('back_shadow_opacity');
$shadow_blur = $this->getOption('back_shadow_blur');
$shadow = $this->getOption('back_shadow');
if($shadow === true)
$shadow = 2;
// background image can replace the back_colour option
$bg = $this->backgroundImage($shadow, $round ? $id : null);
$colour = new Colour($this, $this->getOption('back_colour'));
$canvas = [
'width' => '100%', 'height' => '100%',
'fill' => $colour,
'stroke-width' => 0,
];
$c_el = '';
if($shadow) {
// shadow means canvas cannot be 100% of document
$canvas['x'] = $canvas['y'] = new Number($stroke_width / 2);
// blurring means using a filter and a larger offset
if($shadow_blur) {
$filter_opts = [
'offset_x' => $shadow,
'offset_y' => $shadow,
'blur' => $shadow_blur,
'opacity' => $shadow_opacity,
'shadow_only' => true,
];
$shadow += $shadow_blur;
$filter = $this->defs->addFilter('shadow', $filter_opts);
}
$canvas['width'] = new Number($this->width - $shadow - $stroke_width);
$canvas['height'] = new Number($this->height - $shadow - $stroke_width);
$filled = [
//'x' => $shadow, 'y' => $shadow,
'width' => new Number($this->width - $shadow),
'height' => new Number($this->height - $shadow),
'fill' => '#000',
'stroke-width' => 0,
//'opacity' => $shadow_opacity,
];
if($shadow_blur) {
$filled['filter'] = 'url(#' . $filter . ')';
} else {
$filled['x'] = $shadow;
$filled['y'] = $shadow;
$filled['opacity'] = $shadow_opacity;
}
if($round)
$filled['rx'] = $filled['ry'] = new Number($round);
$c_el .= $this->element('rect', $filled);
// increase padding to clear shadow
$this->pad_right += $shadow;
$this->pad_bottom += $shadow;
}
if($colour->opacity() < 1)
$canvas['opacity'] = $colour->opacity(true);
if($round)
$canvas['rx'] = $canvas['ry'] = new Number($round);
if($bg == '' && $stroke_width) {
$canvas['stroke-width'] = $stroke_width;
$canvas['stroke'] = $stroke_colour;
}
$c_el .= $this->element('rect', $canvas);
// create a clip path for rounded rectangle
if($round) {
$this->defs->add($this->element('clipPath', ['id' => $id], null,
$this->element('rect', $canvas)));
}
// if the background image is an element, insert it between the background
// colour and border rect
if($bg != '') {
$c_el .= $bg;
if($stroke_width) {
$canvas['stroke-width'] = $stroke_width;
$canvas['stroke'] = $stroke_colour;
$canvas['fill'] = 'none';
$c_el .= $this->element('rect', $canvas);
}
}
return $c_el;
}
/**
* Displays readable (hopefully) error message
*/
protected function errorText($error)
{
if(!is_numeric($this->height))
$this->height = 100;
$text = ['x' => 3, 'y' => $this->height - 3];
$style = [
'font-family' => 'Courier New',
'font-size' => '11px',
'font-weight' => 'bold',
];
$e = $this->contrastText($text['x'], $text['y'], $error, 'blue',
'white', $style);
return $e;
}
/**
* Displays high-contrast text
*/
protected function contrastText($x, $y, $text, $fcolour = 'black',
$bcolour = 'white', $properties = null, $styles = null)
{
$xform = new Transform;
$xform->translate($x, $y);
$props = ['transform' => $xform, 'fill' => $fcolour];
if(is_array($properties))
$props = array_merge($properties, $props);
$bg = $this->element('text', ['stroke-width' => '2px', 'stroke' => $bcolour],
null, $text);
$fg = $this->element('text', null, null, $text);
return $this->element('g', $props, $styles, $bg . $fg);
}
/**
* Builds an element
*/
public function element($name, $attribs = null, $styles = null,
$content = null, $no_whitespace = false)
{
if($this->namespace && strpos($name, ':') === false)
$name = 'svg:' . $name;
$element = '<' . $name;
if(is_array($attribs)) {
foreach($attribs as $attr => $val) {
$value = new Attribute($attr, $val, $this->encoding);
$element .= ' ' . $attr . '="' . $value . '"';
}
}
if(is_array($styles)) {
$element .= ' style="';
foreach($styles as $attr => $val) {
$value = new Attribute($attr, $val, $this->encoding);
$element .= $attr . ':' . $value . ';';
}
$element .= '"';
}
if($content === null)
$element .= "/>";
else
$element .= '>' . $content . '</' . $name . ">";
if(!$no_whitespace)
$element .= "\n";
return $element;
}
/**
* Returns a link URL or NULL if none
*/
public function getLinkURL($item, $key, $row = 0)
{
$link = ($item === null ? null : $item->link);
if(is_numeric($key))
$key = (int)round($key);
if($link === null && is_array($this->links[$row]) &&
isset($this->links[$row][$key])) {
$link = $this->links[$row][$key];
}
// check for absolute links
if($link !== null && strpos($link,'//') === false)
$link = $this->link_base . $link;
return $link;
}
/**
* Retrieves a link
*/
public function getLink($item, $key, $content, $row = 0)
{
$link = $this->getLinkURL($item, $key, $row);
if($link === null)
return $content;
$link_attr = ['xlink:href' => $link];
if(!empty($this->link_target))
$link_attr['target'] = $this->link_target;
return $this->element('a', $link_attr, null, $content);
}
/**
* Returns TRUE if the item is visible on the graph
*/
public function isVisible($item, $dataset = 0)
{
// default implementation is for all non-zero values to be visible
return ($item->value != 0);
}
/**
* Sets up the colour class
*/
protected function colourSetup($count, $datasets = null, $reverse = false)
{
$this->colours->setup($count, $datasets, $reverse);
}
/**
* Returns a Colour
*/
public function getColour($item, $key, $dataset, $allow_gradient = true,
$allow_pattern = true)
{
if($item !== null && $item->colour !== null)
return new Colour($this, $item->colour, $allow_gradient, $allow_pattern);