* @version 0.1b
*
* @see https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/transform
* @see http://stackoverflow.com/questions/14684846/flattening-svg-matrix-transforms-in-inkscape
* @see http://stackoverflow.com/questions/7742148/how-to-convert-text-to-svg-paths
*/
class EasySVG
{
protected $font;
protected $svg;
public function __construct()
{
// default font data
$this->font = new stdClass();
$this->font->id = '';
$this->font->horizAdvX = 0;
$this->font->unitsPerEm = 0;
$this->font->ascent = 0;
$this->font->descent = 0;
$this->font->glyphs = [];
$this->font->size = 20;
$this->font->color = '';
$this->font->lineHeight = 1;
$this->font->letterSpacing = 0;
$this->clearSVG();
}
public function clearSVG()
{
$this->svg = new SimpleXMLElement('');
}
/**
* Function takes UTF-8 encoded string and returns unicode number for every character.
* @param string $str
* @return string
*/
private function utf8ToUnicode($str)
{
$unicode = [];
$values = [];
$lookingFor = 1;
for ($i = 0; $i < strlen($str); $i++) {
$thisValue = ord($str[$i]);
if ($thisValue < 128) {
$unicode[] = $thisValue;
} else {
if (count($values) == 0) $lookingFor = ($thisValue < 224) ? 2 : 3;
$values[] = $thisValue;
if (count($values) == $lookingFor) {
$number = ($lookingFor == 3) ?
(($values[0] % 16) * 4096) + (($values[1] % 64) * 64) + ($values[2] % 64) :
(($values[0] % 32) * 64) + ($values[1] % 64);
$unicode[] = $number;
$values = [];
$lookingFor = 1;
}
}
}
return $unicode;
}
/**
* Set font params (short-hand method)
* @param string $filepath
* @param integer $size
* @param string $color
*/
public function setFont($filepath, $size, $color)
{
$this->setFontSVG($filepath);
$this->setFontSize($size);
$this->setFontColor($color);
}
/**
* Set font size for display
* @param int $size
* @return void
*/
public function setFontSize($size)
{
$this->font->size = $size;
}
/**
* Set font color
* @param string $color
* @return void
*/
public function setFontColor($color)
{
$this->font->color = $color;
}
/**
* Set the line height from default (1) to custom value
* @param float $value
* @return void
*/
public function setLineHeight($value)
{
$this->font->lineHeight = $value;
}
/**
* Set the letter spacing from default (0) to custom value
* @param float $value
* @return void
*/
public function setLetterSpacing($value)
{
$this->font->letterSpacing = $value;
}
/**
* Function takes path to SVG font (local path) and processes its xml
* to get path representation of every character and additional
* font parameters
* @param string $filepath
* @return void
*/
public function setFontSVG($filepath)
{
$this->font->glyphs = [];
$z = new XMLReader();
$z->open($filepath);
// move to the first node
while ($z->read()) {
$name = $z->name;
if ($z->nodeType == XMLReader::ELEMENT) {
if ($name == 'font') {
$this->font->id = $z->getAttribute('id');
$this->font->horizAdvX = $z->getAttribute('horiz-adv-x');
}
if ($name == 'font-face') {
$this->font->unitsPerEm = $z->getAttribute('units-per-em');
$this->font->ascent = $z->getAttribute('ascent');
$this->font->descent = $z->getAttribute('descent');
}
if ($name == 'glyph') {
$unicode = $z->getAttribute('unicode');
$unicode = $this->utf8ToUnicode($unicode);
if (isset($unicode[0])) {
$unicode = $unicode[0];
$this->font->glyphs[$unicode] = new stdClass();
$this->font->glyphs[$unicode]->horizAdvX = $z->getAttribute('horiz-adv-x');
if (empty($this->font->glyphs[$unicode]->horizAdvX)) {
$this->font->glyphs[$unicode]->horizAdvX = $this->font->horizAdvX;
}
$this->font->glyphs[$unicode]->d = $z->getAttribute('d');
// save em value for letter spacing (109 is unicode for the letter 'm')
if ($unicode == '109') {
$this->font->em = $this->font->glyphs[$unicode]->horizAdvX;
}
}
}
}
}
}
/**
* Add a path to the SVG
* @param string $def
* @param array $attributes
* @return SimpleXMLElement
*/
public function addPath($def, $attributes = [])
{
$path = $this->svg->addChild('path');
foreach ($attributes as $key => $value) {
$path->addAttribute($key, $value);
}
$path->addAttribute('d', $def);
return $path;
}
/**
* Add a text to the SVG
* @param string $def
* @param float $x
* @param float $y
* @param array $attributes
* @return SimpleXMLElement
*/
public function addText($text, $x = 0, $y = 0, $attributes = [])
{
$def = $this->textDef($text);
if ($x != 0 || $y != 0) {
$def = $this->defTranslate($def, $x, $y);
}
if ($this->font->color) {
$attributes['fill'] = $this->font->color;
}
return $this->addPath($def, $attributes);
}
/**
* Function takes UTF-8 encoded string and size, returns xml for SVG paths representing this string.
* @param string $text UTF-8 encoded text
* @return string xml for text converted into SVG paths
*/
public function textDef($text)
{
$def = [];
$horizAdvX = 0;
$horizAdvY = $this->font->ascent + $this->font->descent;
$fontSize = (float) $this->font->size / $this->font->unitsPerEm;
$text = $this->utf8ToUnicode($text);
$counter = count($text);
for ($i = 0; $i < $counter; $i++) {
$letter = $text[$i];
// line break support (10 is unicode for linebreak)
if ($letter == 10) {
$horizAdvX = 0;
$horizAdvY += $this->font->lineHeight * ($this->font->ascent + $this->font->descent);
continue;
}
// extract character definition
$d = $this->font->glyphs[$letter]->d;
// transform typo from original SVG format to straight display
$d = $this->defScale($d, $fontSize, -$fontSize);
$d = $this->defTranslate($d, $horizAdvX, $horizAdvY * $fontSize * 2);
$def[] = $d;
// next letter's position
$horizAdvX += $this->font->glyphs[$letter]->horizAdvX * $fontSize +
$this->font->em * $this->font->letterSpacing * $fontSize;
}
return implode(' ', $def);
}
/**
* Function takes UTF-8 encoded string and size, returns width and height of the whole text
* @param string $text UTF-8 encoded text
* @return array ($width, $height)
*/
public function textDimensions($text)
{
$fontSize = (float) $this->font->size / $this->font->unitsPerEm;
$text = $this->utf8ToUnicode($text);
$lineWidth = 0;
$lineHeight = ($this->font->ascent + $this->font->descent) * $fontSize * 2;
$width = 0;
$height = $lineHeight;
$counter = count($text);
for ($i = 0; $i < $counter; $i++) {
$letter = $text[$i];
// line break support (10 is unicode for linebreak)
if ($letter == 10) {
$width = $lineWidth > $width ? $lineWidth : $width;
$height += $lineHeight * $this->font->lineHeight;
$lineWidth = 0;
continue;
}
$lineWidth += $this->font->glyphs[$letter]->horizAdvX * $fontSize +
$this->font->em * $this->font->letterSpacing * $fontSize;
}
// only keep the widest line's width
$width = $lineWidth > $width ? $lineWidth : $width;
return [$width, $height];
}
/**
* Function takes unicode character and returns the UTF-8 equivalent
* @param string $str
* @return string
*/
public function unicodeDef($unicode)
{
$horizAdvY = $this->font->ascent + $this->font->descent;
$fontSize = (float) $this->font->size / $this->font->unitsPerEm;
// extract character definition
$d = $this->font->glyphs[hexdec($unicode)]->d;
// transform typo from original SVG format to straight display
$d = $this->defScale($d, $fontSize, -$fontSize);
$d = $this->defTranslate($d, 0, $horizAdvY * $fontSize * 2);
return $d;
}
/**
* Returns the character width, as set in the font file
* @param string $str
* @param boolean $is_unicode
* @return float
*/
public function characterWidth($char, $is_unicode = false)
{
if ($is_unicode) {
$letter = hexdec($char);
} else {
$letter = $this->utf8ToUnicode($char);
}
if (!isset($this->font->glyphs[$letter])) {
return null;
}
$fontSize = (float) $this->font->size / $this->font->unitsPerEm;
return $this->font->glyphs[$letter]->horizAdvX * $fontSize;
}
/**
* Applies a translate transformation to definition
* @param string $def definition
* @param float $x
* @param float $y
* @return string
*/
public function defTranslate($def, $x = 0, $y = 0)
{
return $this->defApplyMatrix($def, [1, 0, 0, 1, $x, $y]);
}
/**
* Applies a translate transformation to definition
* @param string $def Definition
* @param integer $angle Rotation angle (degrees)
* @param integer $x X coordinate of rotation center
* @param integer $y Y coordinate of rotation center
* @return string
*/
public function defRotate($def, $angle, $x = 0, $y = 0)
{
if ($x == 0 && $y == 0) {
$angle = deg2rad($angle);
return $this->defApplyMatrix($def, [cos($angle), sin($angle), -sin($angle), cos($angle), 0, 0]);
}
// rotate by a given point
$def = $this->defTranslate($def, $x, $y);
$def = $this->defRotate($def, $angle);
$def = $this->defTranslate($def, -$x, -$y);
return $def;
}
/**
* Applies a scale transformation to definition
* @param string $def definition
* @param integer $x
* @param integer $y
* @return string
*/
public function defScale($def, $x = 1, $y = 1)
{
return $this->defApplyMatrix($def, [$x, 0, 0, $y, 0, 0]);
}
/**
* Calculates the new definition with the matrix applied
* @param string $def
* @param array $matrix
* @return string
*/
public function defApplyMatrix($def, $matrix)
{
// if there are several shapes in this definition, do the operation for each
preg_match_all('/M[^zZ]*[zZ]/', $def, $shapes);
$shapes = $shapes[0];
if (count($shapes) > 1) {
foreach ($shapes as &$shape) {
$shape = $this->defApplyMatrix($shape, $matrix);
}
return implode(' ', $shapes);
}
preg_match_all('/[a-zA-Z]+[^a-zA-Z]*/', $def, $instructions);
$instructions = $instructions[0];
foreach ($instructions as &$instruction) {
$i = preg_replace('/[^a-zA-Z]*/', '', $instruction);
preg_match_all('/\-?[0-9\.]+/', $instruction, $coords);
$coords = $coords[0];
if (empty($coords)) {
continue;
}
$new_coords = [];
while (count($coords) > 0) {
// do the matrix calculation stuff
[$a, $b, $c, $d, $e, $f] = $matrix;
// exception for relative instruction
if (preg_match('/[a-z]/', $i)) {
$e = 0;
$f = 0;
}
// convert horizontal lineto (relative)
if ($i == 'h') {
$i = 'l';
$x = (float) array_shift($coords);
$y = 0;
// add new point's coordinates
$current_point = [$a * $x + $e, $b * $x + $f];
$new_coords = [...$new_coords, ...$current_point];
} elseif ($i == 'v') {
// convert vertical lineto (relative)
$i = 'l';
$x = 0;
$y = (float) array_shift($coords);
// add new point's coordinates
$current_point = [$c * $y + $e, $d * $y + $f];
$new_coords = [...$new_coords, ...$current_point];
} elseif ($i == 'q') {
// convert quadratic bezier curve (relative)
$x = (float) array_shift($coords);
$y = (float) array_shift($coords);
// add new point's coordinates
$current_point = [$a * $x + $c * $y + $e, $b * $x + $d * $y + $f];
$new_coords = [...$new_coords, ...$current_point];
// same for 2nd point
$x = (float) array_shift($coords);
$y = (float) array_shift($coords);
// add new point's coordinates
$current_point = [$a * $x + $c * $y + $e, $b * $x + $d * $y + $f];
$new_coords = array_merge($new_coords, $current_point);
} else {
// every other commands
// @TODO: handle 'a,c,s' (elliptic arc curve) commands
// cf. http://www.w3.org/TR/SVG/paths.html#PathDataCurveCommands
$x = (float) array_shift($coords);
$y = (float) array_shift($coords);
// add new point's coordinates
$current_point = [$a * $x + $c * $y + $e, $b * $x + $d * $y + $f];
$new_coords = [...$new_coords, ...$current_point];
}
}
$instruction = $i . implode(',', $new_coords);
// remove useless commas
$instruction = preg_replace('/,\-/', '-', $instruction);
}
return implode('', $instructions);
}
/**
*
* Short-hand methods
*
*/
/**
* Return full SVG XML
* @return string
*/
public function asXML()
{
return $this->svg->asXML();
}
/**
* Adds an attribute to the SVG
* @param string $key
* @param string $value
*/
public function addAttribute($key, $value)
{
return $this->svg->addAttribute($key, $value);
}
}