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SVGGraph.php
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SVGGraph.php
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<?php
/**
* Copyright (C) 2009-2015 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 <[email protected]>
*/
define('SVGGRAPH_VERSION', 'SVGGraph 2.18');
require_once 'SVGGraphColours.php';
class SVGGraph {
private $width = 100;
private $height = 100;
private $settings = array();
public $values = array();
public $links = NULL;
public $colours = NULL;
private $colour_sets = 0;
public function __construct($w, $h, $settings = NULL)
{
$this->width = $w;
$this->height = $h;
if(is_array($settings))
$this->settings = $settings;
// use mbstring if available, or fall back to 1-byte char strings
if(!function_exists('SVGGraphStrlen')) {
if(extension_loaded('mbstring')) {
function SVGGraphStrlen($s, $e) {
return mb_strlen($s, $e);
}
function SVGGraphSubstr($s, $b, $l, $e) {
return mb_substr($s, $b, $l, $e);
}
} else {
function SVGGraphStrlen($s, $e) {
return strlen($s);
}
function SVGGraphSubstr($s, $b, $l, $e) {
return is_null($l) ? substr($s, $b) : substr($s, $b, $l);
}
}
}
}
public function Values($values)
{
if(is_array($values))
$this->values = $values;
else
$this->values = func_get_args();
}
public function Links($links)
{
if(is_array($links))
$this->links = $links;
else
$this->links = func_get_args();
}
/**
* Assign a single colour set for use across datasets
*/
public function Colours($colours)
{
$this->colours = $colours;
}
/**
* Sets colours for a single dataset
*/
public function ColourSet($dataset, $colours)
{
if(!is_object($this->colours))
$this->colours = new SVGGraphColours();
$this->colours->Set($dataset, $colours);
}
/**
* Sets up RGB colour range
*/
public function ColourRangeRGB($dataset, $r1, $g1, $b1, $r2, $g2, $b2)
{
if(!is_object($this->colours))
$this->colours = new SVGGraphColours();
$this->colours->RangeRGB($dataset, $r1, $g1, $b1, $r2, $g2, $b2);
}
/**
* RGB colour range from hex codes
*/
public function ColourRangeHexRGB($dataset, $c1, $c2)
{
if(!is_object($this->colours))
$this->colours = new SVGGraphColours();
$this->colours->RangeHexRGB($dataset, $c1, $c2);
}
/**
* Sets up HSL colour range
*/
public function ColourRangeHSL($dataset, $h1, $s1, $l1, $h2, $s2, $l2,
$reverse = false)
{
if(!is_object($this->colours))
$this->colours = new SVGGraphColours();
$this->colours->RangeHSL($dataset, $h1, $s1, $l1, $h2, $s2, $l2, $reverse);
}
/**
* HSL colour range from hex codes
*/
public function ColourRangeHexHSL($dataset, $c1, $c2, $reverse = false)
{
if(!is_object($this->colours))
$this->colours = new SVGGraphColours();
$this->colours->RangeHexHSL($dataset, $c1, $c2, $reverse);
}
/**
* Sets up HSL colour range from RGB values
*/
public function ColourRangeRGBtoHSL($dataset, $r1, $g1, $b1, $r2, $g2, $b2,
$reverse = false)
{
if(!is_object($this->colours))
$this->colours = new SVGGraphColours();
$this->colours->RangeRGBtoHSL($dataset, $r1, $g1, $b1, $r2, $g2, $b2,
$reverse);
}
/**
* Instantiate the correct class
*/
private function Setup($class)
{
// load the relevant class file
if(!class_exists($class))
include 'SVGGraph' . $class . '.php';
$g = new $class($this->width, $this->height, $this->settings);
$g->Values($this->values);
$g->Links($this->links);
if(is_object($this->colours))
$g->colours = $this->colours;
else
$g->colours = new SVGGraphColours($this->colours);
return $g;
}
/**
* Fetch the content
*/
public function Fetch($class, $header = TRUE, $defer_js = TRUE)
{
$this->g = $this->Setup($class);
return $this->g->Fetch($header, $defer_js);
}
/**
* Pass in the type of graph to display
*/
public function Render($class, $header = TRUE, $content_type = TRUE,
$defer_js = FALSE)
{
$this->g = $this->Setup($class);
return $this->g->Render($header, $content_type, $defer_js);
}
public function FetchJavascript()
{
if(isset($this->g))
return $this->g->FetchJavascript(true, true, true);
}
}
/**
* Base class for all graph types
*/
abstract class Graph {
protected $settings = array();
protected $values = array();
protected $link_base = '';
protected $link_target = '_blank';
protected $links = array();
protected $gradients = array();
protected $gradient_map = array();
protected $pattern_list = NULL;
protected $defs = array();
protected $back_matter = '';
protected $namespaces = array();
protected static $javascript = NULL;
private static $last_id = 0;
private static $precision = 5;
private static $decimal = '.';
private static $thousands = ',';
protected $legend_reverse = false;
protected $force_assoc = false;
protected $repeated_keys = 'error';
protected $require_structured = false;
protected $require_integer_keys = true;
protected $multi_graph = NULL;
public function __construct($w, $h, $settings = NULL)
{
$this->width = $w;
$this->height = $h;
// get settings from ini file that are relevant to this class
$ini_file = dirname(__FILE__) . DIRECTORY_SEPARATOR . 'svggraph.ini';
if(!file_exists($ini_file))
$ini_settings = FALSE;
else
$ini_settings = parse_ini_file($ini_file, TRUE);
if($ini_settings === FALSE)
die("Ini file [{$ini_file}] not found -- exiting");
$class = get_class($this);
$hierarchy = array($class);
while($class = get_parent_class($class))
array_unshift($hierarchy, $class);
while(count($hierarchy)) {
$class = array_shift($hierarchy);
if(array_key_exists($class, $ini_settings))
$this->settings = array_merge($this->settings, $ini_settings[$class]);
}
if(is_array($settings))
$this->Settings($settings);
}
/**
* Retrieves properties from the settings array if they are not
* already available as properties
*/
public function __get($name)
{
$this->{$name} = isset($this->settings[$name]) ? $this->settings[$name] : null;
return $this->{$name};
}
/**
* Make empty($this->option) more robust
*/
public function __isset($name)
{
return isset($this->settings[$name]);
}
/**
* Sets the options
*/
public function Settings(&$settings)
{
foreach($settings as $key => $value) {
$this->settings[$key] = $value;
$this->{$key} = $value;
}
}
/**
* Sets the graph values
*/
public function Values($values)
{
$new_values = array();
$v = func_get_args();
if(count($v) == 1)
$v = array_shift($v);
$set_values = true;
if(is_array($v)) {
reset($v);
$first_key = key($v);
if(!is_null($first_key) && is_array($v[$first_key])) {
foreach($v as $data_set)
$new_values[] = $data_set;
$set_values = false;
}
}
if($set_values)
$new_values[] = $v;
if($this->scatter_2d) {
$this->scatter_2d = false;
if(empty($this->structure))
$this->structure = array('key' => 0, 'value' => 1, 'datasets' => true);
}
if($this->structured_data || is_array($this->structure)) {
$this->structured_data = true;
require_once 'SVGGraphStructuredData.php';
if(is_array($this->structure)) {
$this->structure['_before'] = $this->units_before_x;
$this->structure['_after'] = $this->units_x;
$this->structure['_encoding'] = $this->encoding;
}
$this->values = new SVGGraphStructuredData($new_values,
$this->force_assoc, $this->structure, $this->repeated_keys,
$this->require_integer_keys, $this->require_structured);
} else {
require_once 'SVGGraphData.php';
$this->values = new SVGGraphData($new_values, $this->force_assoc);
if(!$this->values->error && !empty($this->require_structured))
$this->values->error = get_class($this) . ' requires structured data';
}
}
/**
* Sets the links from each item
*/
public function Links()
{
$this->links = func_get_args();
}
protected function GetMinValue()
{
if(!is_null($this->multi_graph))
return $this->multi_graph->GetMinValue();
return $this->values->GetMinValue();
}
protected function GetMaxValue()
{
if(!is_null($this->multi_graph))
return $this->multi_graph->GetMaxValue();
return $this->values->GetMaxValue();
}
protected function GetMinKey()
{
if(!is_null($this->multi_graph))
return $this->multi_graph->GetMinKey();
return $this->values->GetMinKey();
}
protected function GetMaxKey()
{
if(!is_null($this->multi_graph))
return $this->multi_graph->GetMaxKey();
return $this->values->GetMaxKey();
}
protected function GetKey($i)
{
if(!is_null($this->multi_graph))
return $this->multi_graph->GetKey($i);
return $this->values->GetKey($i);
}
/**
* Draws the selected graph
*/
public function DrawGraph()
{
$canvas_id = $this->NewID();
$contents = $this->Canvas($canvas_id);
$contents .= $this->DrawTitle();
$contents .= $this->Draw();
$contents .= $this->DrawDataLabels();
$contents .= $this->DrawBackMatter();
$contents .= $this->DrawLegend();
// rounded rects might need a clip path
if($this->back_round && $this->back_round_clip) {
$group = array('clip-path' => "url(#{$canvas_id})");
return $this->Element('g', $group, NULL, $contents);
}
return $contents;
}
/**
* Adds any markup that goes after the graph
*/
protected function DrawBackMatter()
{
return $this->back_matter;
}
/**
* Draws the legend
*/
protected function DrawLegend()
{
if(empty($this->legend_entries))
return '';
// need to find the actual number of entries in the legend
$entry_count = 0;
$longest = 0;
foreach($this->legend_entries as $key => $value) {
$entry = $this->DrawLegendEntry($key, 0, 0, 20, 20);
if($entry != '') {
++$entry_count;
if(SVGGraphStrlen($value, $this->encoding) > $longest)
$longest = SVGGraphStrlen($value, $this->encoding);
}
}
if(!$entry_count)
return '';
$title = '';
$title_width = $entries_x = 0;
$text_columns = $entry_columns = array();
$start_y = $this->legend_padding;
$w = $this->legend_entry_width;
$x = 0;
$entry_height = max($this->legend_font_size, $this->legend_entry_height);
$text_y_offset = $entry_height / 2 + $this->legend_font_size / 2;
// make room for title
if($this->legend_title != '') {
$title_font = $this->GetFirst($this->legend_title_font,
$this->legend_font);
$title_font_size = $this->GetFirst($this->legend_title_font_size,
$this->legend_font_size);
$title_font_adjust = $this->GetFirst($this->legend_title_font_adjust,
$this->legend_font_adjust);
$title_colour = $this->GetFirst($this->legend_title_colour,
$this->legend_colour);
$start_y += $title_font_size + $this->legend_padding;
$title_width = $this->legend_padding * 2 +
$title_font_size * $title_font_adjust *
SVGGraphStrlen($this->legend_title, $this->encoding);
}
$columns = max(1, min(ceil($this->legend_columns), $entry_count));
$per_column = ceil($entry_count / $columns);
$columns = ceil($entry_count / $per_column);
$column = 0;
$text = array('x' => 0);
$legend_entries = $this->legend_reverse ?
array_reverse($this->legend_entries, true) : $this->legend_entries;
$column_entry = 0;
$y = $start_y;
foreach($legend_entries as $key => $value) {
if(!empty($value)) {
$entry = $this->DrawLegendEntry($key, $x, $y, $w, $entry_height);
if(!empty($entry)) {
$text['y'] = $y + $text_y_offset;
if(isset($text_columns[$column]))
$text_columns[$column] .= $this->Element('text', $text, NULL, $value);
else
$text_columns[$column] = $this->Element('text', $text, NULL, $value);
if(isset($entry_columns[$column]))
$entry_columns[$column] .= $entry;
else
$entry_columns[$column] = $entry;
$y += $entry_height + $this->legend_padding;
if(++$column_entry == $per_column) {
$column_entry = 0;
$y = $start_y;
++$column;
}
}
}
}
// if there's nothing to go in the legend, stop now
if(empty($entry_columns))
return '';
$text_space = $longest * $this->legend_font_size *
$this->legend_font_adjust;
if($this->legend_text_side == 'left') {
$text_x_offset = $text_space + $this->legend_padding;
$entries_x_offset = $text_space + $this->legend_padding * 2;
} else {
$text_x_offset = $w + $this->legend_padding * 2;
$entries_x_offset = $this->legend_padding;
}
$longest_width = $this->legend_padding * (2 * $columns + 1) +
($this->legend_entry_width + $text_space) * $columns;
$column_width = $this->legend_padding * 2 + $this->legend_entry_width +
$text_space;
$width = max($title_width, $longest_width);
$height = $start_y + $per_column * ($entry_height + $this->legend_padding);
// centre the entries if the title makes the box bigger
if($width > $longest_width) {
$offset = ($width - $longest_width) / 2;
$entries_x_offset += $offset;
$text_x_offset += $offset;
}
$text_group = array('transform' => "translate($text_x_offset,0)");
if($this->legend_text_side == 'left')
$text_group['text-anchor'] = 'end';
$entries_group = array('transform' => "translate($entries_x_offset,0)");
$parts = '';
foreach($entry_columns as $col) {
$parts .= $this->Element('g', $entries_group, null, $col);
$entries_x_offset += $column_width;
$entries_group['transform'] = "translate($entries_x_offset,0)";
}
foreach($text_columns as $col) {
$parts .= $this->Element('g', $text_group, null, $col);
$text_x_offset += $column_width;
$text_group['transform'] = "translate($text_x_offset,0)";
}
// create box and title
$box = array(
'fill' => $this->ParseColour($this->legend_back_colour),
'width' => $width,
'height' => $height,
);
if($this->legend_round > 0)
$box['rx'] = $box['ry'] = $this->legend_round;
if($this->legend_stroke_width) {
$box['stroke-width'] = $this->legend_stroke_width;
$box['stroke'] = $this->legend_stroke_colour;
}
$rect = $this->Element('rect', $box);
if($this->legend_title != '') {
$text['x'] = $width / 2;
$text['y'] = $this->legend_padding + $title_font_size;
$text['text-anchor'] = 'middle';
if($title_font != $this->legend_font)
$text['font-family'] = $title_font;
if($title_font_size != $this->legend_font_size)
$text['font-size'] = $title_font_size;
if($this->legend_title_font_weight != $this->legend_font_weight)
$text['font-weight'] = $this->legend_title_font_weight;
if($title_colour != $this->legend_colour)
$text['fill'] = $title_colour;
$title = $this->Element('text', $text, NULL, $this->legend_title);
}
// create group to contain whole legend
list($left, $top) = $this->ParsePosition($this->legend_position,
$width, $height);
$group = array(
'font-family' => $this->legend_font,
'font-size' => $this->legend_font_size,
'fill' => $this->legend_colour,
'transform' => "translate($left,$top)",
);
if($this->legend_font_weight != 'normal')
$group['font-weight'] = $this->legend_font_weight;
// add shadow if not completely transparent
if($this->legend_shadow_opacity > 0) {
$box['x'] = $box['y'] = 2 + ($this->legend_stroke_width / 2);
$box['fill'] = '#000';
$box['opacity'] = $this->legend_shadow_opacity;
unset($box['stroke'], $box['stroke-width']);
$rect = $this->Element('rect', $box) . $rect;
}
if($this->legend_autohide)
$this->AutoHide($group);
if($this->legend_draggable)
$this->SetDraggable($group);
return $this->Element('g', $group, NULL, $rect . $title . $parts);
}
/**
* Parses a position string, returning x and y coordinates
*/
protected function ParsePosition($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 array($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
$translate = array('l' => 'ol', 'r' => 'or', 't' => 'ot', 'b' => 'ob');
if($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 = array(
'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 += $width;
}
return array($x, $y, $text_align, $hpos, $vpos);
}
/**
* Subclasses must draw the entry, if they can
*/
protected function DrawLegendEntry($key, $x, $y, $w, $h)
{
return '';
}
/**
* Draws the graph title, if there is one
*/
protected function DrawTitle()
{
// graph_title is available for all graph types
if(SVGGraphStrlen($this->graph_title, $this->encoding) <= 0)
return '';
$pos = $this->graph_title_position;
$text = array(
'font-size' => $this->graph_title_font_size,
'font-family' => $this->graph_title_font,
'font-weight' => $this->graph_title_font_weight,
'text-anchor' => 'middle',
'fill' => $this->graph_title_colour
);
$lines = $this->CountLines($this->graph_title);
$title_space = $this->graph_title_font_size * $lines +
$this->graph_title_space;
if($pos != 'top' && $pos != 'bottom' && $pos != 'left' && $pos != 'right')
$pos = 'top';
$pad_side = 'pad_' . $pos;
// ensure outside padding is at least the title space
if($this->{$pad_side} < $this->graph_title_space)
$this->{$pad_side} = $this->graph_title_space;
if($pos == 'left') {
$text['x'] = $this->pad_left + $this->graph_title_font_size;
$text['y'] = $this->height / 2;
$text['transform'] = "rotate(270,$text[x],$text[y])";
} elseif($pos == 'right') {
$text['x'] = $this->width - $this->pad_right -
$this->graph_title_font_size;
$text['y'] = $this->height / 2;
$text['transform'] = "rotate(90,$text[x],$text[y])";
} elseif($pos == 'bottom') {
$text['x'] = $this->width / 2;
$text['y'] = $this->height - $this->pad_bottom -
$this->graph_title_font_size * ($lines-1);
} else {
$text['x'] = $this->width / 2;
$text['y'] = $this->pad_top + $this->graph_title_font_size;
}
// increase padding by size of text
$this->{$pad_side} += $title_space;
// the Text function will break it into lines
return $this->Text($this->graph_title, $this->graph_title_font_size,
$text);
}
/**
* This should be overridden by subclass!
*/
abstract protected function Draw();
/**
* Displays the background image
*/
protected function BackgroundImage()
{
if(!$this->back_image)
return '';
$image = array(
'width' => $this->back_image_width,
'height' => $this->back_image_height,
'x' => $this->back_image_left,
'y' => $this->back_image_top,
'xlink:href' => $this->back_image,
'preserveAspectRatio' =>
($this->back_image_mode == 'stretch' ? 'none' : 'xMinYMin')
);
$style = array();
if($this->back_image_opacity)
$style['opacity'] = $this->back_image_opacity;
$contents = '';
if($this->back_image_mode == 'tile') {
$image['x'] = 0; $image['y'] = 0;
$im = $this->Element('image', $image, $style);
$pattern = array(
'id' => $this->NewID(),
'width' => $this->back_image_width,
'height' => $this->back_image_height,
'x' => $this->back_image_left,
'y' => $this->back_image_top,
'patternUnits' => 'userSpaceOnUse'
);
// tiled image becomes a pattern to replace background colour
$this->defs[] = $this->Element('pattern', $pattern, NULL, $im);
$this->back_colour = "url(#{$pattern['id']})";
} else {
$im = $this->Element('image', $image, $style);
$contents .= $im;
}
return $contents;
}
/**
* Displays the background
*/
protected function Canvas($id)
{
$bg = $this->BackgroundImage();
$colour = $this->ParseColour($this->back_colour);
$opacity = 1;
if(strpos($colour, ':') !== FALSE)
list($colour, $opacity) = explode(':', $colour);
$canvas = array(
'width' => '100%', 'height' => '100%',
'fill' => $colour,
'stroke-width' => 0
);
if($opacity < 1)
if($opacity <= 0)
$canvas['fill'] = 'none';
else
$canvas['opacity'] = $opacity;
if($this->back_round)
$canvas['rx'] = $canvas['ry'] = $this->back_round;
if($bg == '' && $this->back_stroke_width) {
$canvas['stroke-width'] = $this->back_stroke_width;
$canvas['stroke'] = $this->back_stroke_colour;
}
$c_el = $this->Element('rect', $canvas);
// create a clip path for rounded rectangle
if($this->back_round)
$this->defs[] = $this->Element('clipPath', array('id' => $id),
NULL, $c_el);
// if the background image is an element, insert it between the background
// colour and border rect
if($bg != '') {
$c_el .= $bg;
if($this->back_stroke_width) {
$canvas['stroke-width'] = $this->back_stroke_width;
$canvas['stroke'] = $this->back_stroke_colour;
$canvas['fill'] = 'none';
$c_el .= $this->Element('rect', $canvas);
}
}
return $c_el;
}
/**
* Fits text to a box - text will be bottom-aligned
*/
protected function TextFit($text, $x, $y, $w, $h, $attribs = NULL,
$styles = NULL)
{
$pos = array('onload' => "textFit(evt,$x,$y,$w,$h)");
if(is_array($attribs))
$pos = array_merge($attribs, $pos);
$txt = $this->Element('text', $pos, $styles, $text);
/** Uncomment to see the box
$rect = array('x' => $x, 'y' => $y, 'width' => $w, 'height' => $h,
'fill' => 'none', 'stroke' => 'black');
$txt .= $this->Element('rect', $rect);
**/
$this->AddFunction('textFit');
return $txt;
}
/**
* Returns a text element, with tspans for subsequent lines
*/
public function Text($text, $line_spacing, $attribs, $styles = NULL)
{
$lines = explode("\n", $text);
$content = array_shift($lines);
$content = ($content == '' ? ' ' : htmlspecialchars($content,
ENT_COMPAT, $this->encoding));
foreach($lines as $line) {
// blank tspan elements collapse to nothing, so insert a space
$line = ($line == '' ? ' ' : htmlspecialchars($line, ENT_COMPAT,
$this->encoding));
$content .= $this->Element('tspan',
array('x' => $attribs['x'], 'dy' => $line_spacing),
NULL, $line);
}
return $this->Element('text', $attribs, $styles, $content);
}
/**
* Returns [width,height] of text
* $text = string OR text length
*/
public static function TextSize($text, $font_size, $font_adjust, $encoding,
$angle = 0, $line_spacing = 0)
{
$height = $font_size;
if(is_int($text)) {
$len = $text;
} else {
// replace all entities with an underscore
$text = preg_replace('/&[^;]+;/', '_', $text);
if($line_spacing > 0) {
$len = 0;
$lines = explode("\n", $text);
foreach($lines as $l)
if(SVGGraphStrlen($l, $encoding) > $len)
$len = SVGGraphStrlen($l, $encoding);
$height += $line_spacing * (count($lines) - 1);
} else {
$len = SVGGraphStrlen($text, $encoding);
}
}
$width = $len * $font_size * $font_adjust;
if($angle % 180 != 0) {
if($angle % 90 == 0) {
$w = $height;
$height = $width;
$width = $w;
} else {
$a = deg2rad($angle);
$sa = abs(sin($a));
$ca = abs(cos($a));
$w = $ca * $width + $sa * $height;
$h = $sa * $width + $ca * $height;
$width = $w;
$height = $h;
}
}
return array($width, $height);
}
/**
* Returns the number of lines in a string
*/
public static function CountLines($text)
{
$c = 1;
$pos = 0;
while(($pos = strpos($text, "\n", $pos)) !== FALSE) {
++$c;
++$pos;
}
return $c;
}
/**
* Displays readable (hopefully) error message
*/
protected function ErrorText($error)
{
$text = array('x' => $this->pad_left, 'y' => $this->height - 3);
$style = array(
'font-family' => 'monospace',
'font-size' => '11px',
'font-weight' => 'bold',
);
$e = $this->ContrastText($text['x'], $text['y'], $error, 'blue',
'white', $style);
return $e;
}