/usr/share/php/Image/Text.php is in php-image-text 0.7.0-2.
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/**
* Image_Text.
*
* This is the main file of the Image_Text package. This file has to be included for
* usage of Image_Text.
*
* This is a simple example script, showing Image_Text's facilities.
*
* PHP version 5
*
* @category Image
* @package Image_Text
* @author Tobias Schlitt <toby@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.php.net/license/3_01.txt PHP License
* @version CVS: $Id$
* @link http://pear.php.net/package/Image_Text
* @since File available since Release 0.0.1
*/
require_once 'Image/Text/Exception.php';
/**
* Image_Text - Advanced text manipulations in images.
*
* Image_Text provides advanced text manipulation facilities for GD2 image generation
* with PHP. Simply add text clippings to your images, let the class automatically
* determine lines, rotate text boxes around their center or top left corner. These
* are only a couple of features Image_Text provides.
*
* @category Image
* @package Image_Text
* @author Tobias Schlitt <toby@php.net>
* @copyright 1997-2005 The PHP Group
* @license http://www.php.net/license/3_01.txt PHP License
* @version Release: @package_version@
* @link http://pear.php.net/package/Image_Text
* @since 0.0.1
*/
class Image_Text
{
/**
* Regex to match HTML style hex triples.
*/
const IMAGE_TEXT_REGEX_HTMLCOLOR
= "/^[#|]([a-f0-9]{2})?([a-f0-9]{2})([a-f0-9]{2})([a-f0-9]{2})$/i";
/**
* Defines horizontal alignment to the left of the text box. (This is standard.)
*/
const IMAGE_TEXT_ALIGN_LEFT = "left";
/**
* Defines horizontal alignment to the center of the text box.
*/
const IMAGE_TEXT_ALIGN_RIGHT = "right";
/**
* Defines horizontal alignment to the center of the text box.
*/
const IMAGE_TEXT_ALIGN_CENTER = "center";
/**
* Defines vertical alignment to the to the top of the text box. (This is
* standard.)
*/
const IMAGE_TEXT_ALIGN_TOP = "top";
/**
* Defines vertical alignment to the to the middle of the text box.
*/
const IMAGE_TEXT_ALIGN_MIDDLE = "middle";
/**
* Defines vertical alignment to the to the bottom of the text box.
*/
const IMAGE_TEXT_ALIGN_BOTTOM = "bottom";
/**
* TODO: This constant is useless until now, since justified alignment does not
* work yet
*/
const IMAGE_TEXT_ALIGN_JUSTIFY = "justify";
/**
* Options array. these options can be set through the constructor or the set()
* method.
*
* Possible options to set are:
* <pre>
* 'x' | This sets the top left coordinates (using x/y) or the
* 'y' | center point coordinates (using cx/cy) for your text
* 'cx' | box. The values from cx/cy will overwrite x/y.
* 'cy' |
*
* 'canvas' | You can set different values as a canvas:
* | - A gd image resource.
* | - An array with 'width' and 'height'.
* | - Nothing (the canvas will be measured after the real
* | text size).
*
* 'antialias' | This is usually true. Set it to false to switch
* | antialiasing off.
*
* 'width' | The width and height for your text box.
* 'height' |
*
* 'halign' | Alignment of your text inside the textbox. Use
* 'valign' | alignment constants to define vertical and horizontal
* | alignment.
*
* 'angle' | The angle to rotate your text box.
*
* 'color' | An array of color values. Colors will be rotated in the
* | mode you choose (linewise or paragraphwise). Can be in
* | the following formats:
* | - String representing HTML style hex couples
* | (+ unusual alpha couple in the first place,
* | optional).
* | - Array of int values using 'r', 'g', 'b' and
* | optionally 'a' as keys.
*
* 'color_mode' | The color rotation mode for your color sets. Does only
* | apply if you defined multiple colors. Use 'line' or
* | 'paragraph'.
*
* 'background_color' | defines the background color. NULL sets it transparent
* 'enable_alpha' | if alpha channel should be enabled. Automatically
* | enabled when background_color is set to NULL
*
* 'font_path' | Location of the font to use. The path only gives the
* | directory path (ending with a /).
* 'font_file' | The fontfile is given in the 'font_file' option.
*
* 'font_size' | The font size to render text in (will be overwriten, if
* | you use automeasurize).
*
* 'line_spacing' | Measure for the line spacing to use. Default is 0.5.
*
* 'min_font_size' | Automeasurize settings. Try to keep this area as small
* 'max_font_size' | as possible to get better performance.
*
* 'image_type' | The type of image (use image type constants). Is
* | default set to PNG.
*
* 'dest_file' | The destination to (optionally) save your file.
* </pre>
*
* @var array
* @see Image_Text::set()
*/
private $_options = array(
// orientation
'x' => 0,
'y' => 0,
// surface
'canvas' => null,
'antialias' => true,
// text clipping
'width' => 0,
'height' => 0,
// text alignment inside the clipping
'halign' => self::IMAGE_TEXT_ALIGN_LEFT,
'valign' => self::IMAGE_TEXT_ALIGN_TOP,
// angle to rotate the text clipping
'angle' => 0,
// color settings
'color' => array('#000000'),
'color_mode' => 'line',
'background_color' => '#000000',
'enable_alpha' => false,
// font settings
'font_path' => "./",
'font_file' => null,
'font_size' => 2,
'line_spacing' => 0.5,
// automasurizing settings
'min_font_size' => 1,
'max_font_size' => 100,
//max. lines to render
'max_lines' => 100,
// misc settings
'image_type' => IMAGETYPE_PNG,
'dest_file' => ''
);
/**
* Contains option names, which can cause re-initialization force.
*
* @var array
*/
private $_reInits = array(
'width', 'height', 'canvas', 'angle', 'font_file', 'font_path', 'font_size'
);
/**
* The text you want to render.
*
* @var string
*/
private $_text;
/**
* Resource ID of the image canvas.
*
* @var resource
*/
private $_img;
/**
* Tokens (each word).
*
* @var array
*/
private $_tokens = array();
/**
* Fullpath to the font.
*
* @var string
*/
private $_font;
/**
* Contains the bbox of each rendered lines.
*
* @var array
*/
private $_bbox = array();
/**
* Defines in which mode the canvas has be set.
*
* @var array
*/
private $_mode = '';
/**
* Color indices returned by imagecolorallocatealpha.
*
* @var array
*/
private $_colors = array();
/**
* Width and height of the (rendered) text.
*
* @var array
*/
private $_realTextSize = array('width' => false, 'height' => false);
/**
* Measurized lines.
*
* @var array
*/
private $_lines = false;
/**
* Fontsize for which the last measuring process was done.
*
* @var array
*/
private $_measurizedSize = false;
/**
* Is the text object initialized?
*
* @var bool
*/
private $_init = false;
/**
* Constructor
*
* Set the text and options. This initializes a new Image_Text object. You must
* set your text here. Optionally you can set all options here using the $options
* parameter. If you finished switching all options you have to call the init()
* method first before doing anything further! See Image_Text::set() for further
* information.
*
* @param string $text Text to print.
* @param array $options Options.
*
* @see Image_Text::set(), Image_Text::construct(), Image_Text::init()
*/
public function __construct($text, $options = null)
{
$this->set('text', $text);
if (!empty($options)) {
$this->_options = array_merge($this->_options, $options);
}
}
/**
* Construct and initialize an Image_Text in one step.
* This method is called statically and creates plus initializes an Image_Text
* object. Beware: You will have to recall init() if you set an option afterwards
* manually.
*
* @param string $text Text to print.
* @param array $options Options.
*
* @return Image_Text
* @see Image_Text::set(), Image_Text::Image_Text(), Image_Text::init()
*/
public static function construct($text, $options)
{
$itext = new Image_Text($text, $options);
$itext->init();
return $itext;
}
/**
* Set options
*
* Set a single or multiple options. It may happen that you have to reinitialize
* the Image_Text object after changing options. For possible options, please
* take a look at the class options array!
*
* @param array|string $option A single option name or the options array.
* @param mixed $value Option value if $option is string.
*
* @return void
* @see Image_Text::Image_Text()
* @throws Image_Text_Exception setting the value failed
*/
public function set($option, $value = null)
{
$reInits = array_flip($this->_reInits);
if (!is_array($option)) {
if (!isset($value)) {
throw new Image_Text_Exception('No value given.');
}
$option = array($option => $value);
}
foreach ($option as $opt => $val) {
switch ($opt) {
case 'color':
$this->setColors($val);
break;
case 'text':
if (is_array($val)) {
$this->_text = implode('\n', $val);
} else {
$this->_text = $val;
}
break;
default:
$this->_options[$opt] = $val;
break;
}
if (isset($reInits[$opt])) {
$this->_init = false;
}
}
}
/**
* Set the color-set
*
* Using this method you can set multiple colors for your text. Use a simple
* numeric array to determine their order and give it to this function. Multiple
* colors will be cycled by the options specified 'color_mode' option. The given
* array will overwrite the existing color settings!
*
* The following colors syntaxes are understood by this method:
* <ul>
* <li>"#ffff00" hexadecimal format (HTML style), with and without #.</li>
* <li>"#08ffff00" hexadecimal format (HTML style) with alpha channel (08),
* with and without #.</li>
* <li>array with 'r','g','b' and (optionally) 'a' keys, using int values.</li>
* </ul>
* A single color or an array of colors are allowed here.
*
* @param array|string $colors Single color or array of colors.
*
* @return void
* @see Image_Text::setColor(), Image_Text::set()
* @throws Image_Text_Exception
*/
public function setColors($colors)
{
$i = 0;
if (is_array($colors) && (is_string($colors[0]) || is_array($colors[0]))) {
foreach ($colors as $color) {
$this->setColor($color, $i++);
}
} else {
$this->setColor($colors, $i);
}
}
/**
* Set a color
*
* This method is used to set a color at a specific color ID inside the color
* cycle.
*
* The following colors syntaxes are understood by this method:
* <ul>
* <li>"#ffff00" hexadecimal format (HTML style), with and without #.</li>
* <li>"#08ffff00" hexadecimal format (HTML style) with alpha channel (08), with
* and without #.</li>
* <li>array with 'r','g','b' and (optionally) 'a' keys, using int values.</li>
* </ul>
*
* @param array|string $color Color value.
* @param int $id ID (in the color array) to set color to.
*
* @return void
* @see Image_Text::setColors(), Image_Text::set()
* @throws Image_Text_Exception
*/
function setColor($color, $id = 0)
{
if (is_array($color)) {
if (isset($color['r']) && isset($color['g']) && isset($color['b'])) {
$color['a'] = isset($color['a']) ? $color['a'] : 0;
$this->_options['colors'][$id] = $color;
} else if (isset($color[0]) && isset($color[1]) && isset($color[2])) {
$color['r'] = $color[0];
$color['g'] = $color[1];
$color['b'] = $color[2];
$color['a'] = isset($color[3]) ? $color[3] : 0;
$this->_options['colors'][$id] = $color;
} else {
throw new Image_Text_Exception(
'Use keys 1,2,3 (optionally) 4 or r,g,b and (optionally) a.'
);
}
} elseif (is_string($color)) {
$color = $this->convertString2RGB($color);
if ($color) {
$this->_options['color'][$id] = $color;
} else {
throw new Image_Text_Exception('Invalid color.');
}
}
if ($this->_img) {
$aaFactor = ($this->_options['antialias']) ? 1 : -1;
if (function_exists('imagecolorallocatealpha') && isset($color['a'])) {
$this->_colors[$id] = $aaFactor *
imagecolorallocatealpha(
$this->_img,
$color['r'], $color['g'], $color['b'], $color['a']
);
} else {
$this->_colors[$id] = $aaFactor *
imagecolorallocate(
$this->_img,
$color['r'], $color['g'], $color['b']
);
}
if ($this->_colors[$id] == 0 && $aaFactor == -1) {
// correction for black with antialiasing OFF
// since color cannot be negative zero
$this->_colors[$id] = -256;
}
}
}
/**
* Initialize the Image_Text object.
*
* This method has to be called after setting the options for your Image_Text
* object. It initializes the canvas, normalizes some data and checks important
* options. Be sure to check the initialization after you switched some options.
* The set() method may force you to reinitialize the object.
*
* @return void
* @see Image_Text::set()
* @throws Image_Text_Exception
*/
public function init()
{
// Does the fontfile exist and is readable?
$fontFile = rtrim($this->_options['font_path'], '/\\');
$fontFile .= defined('OS_WINDOWS') && OS_WINDOWS ? '\\' : '/';
$fontFile .= $this->_options['font_file'];
$fontFile = realpath($fontFile);
if (empty($fontFile)) {
throw new Image_Text_Exception('You must supply a font file.');
} elseif (!file_exists($fontFile)) {
throw new Image_Text_Exception('Font file was not found.');
} elseif (!is_readable($fontFile)) {
throw new Image_Text_Exception('Font file is not readable.');
} elseif (!imagettfbbox(1, 1, $fontFile, 1)) {
throw new Image_Text_Exception('Font file is not valid.');
}
$this->_font = $fontFile;
// Is the font size to small?
if ($this->_options['width'] < 1) {
throw new Image_Text_Exception('Width too small. Has to be > 1.');
}
// Check and create canvas
$image_canvas = false;
switch (true) {
case (empty($this->_options['canvas'])):
// Create new image from width && height of the clipping
$this->_img = imagecreatetruecolor(
$this->_options['width'], $this->_options['height']
);
if (!$this->_img) {
throw new Image_Text_Exception('Could not create image canvas.');
}
break;
case (is_resource($this->_options['canvas']) &&
get_resource_type($this->_options['canvas']) == 'gd'):
// The canvas is an image resource
$image_canvas = true;
$this->_img = $this->_options['canvas'];
break;
case (is_array($this->_options['canvas']) &&
isset($this->_options['canvas']['width']) &&
isset($this->_options['canvas']['height'])):
// Canvas must be a width and height measure
$this->_img = imagecreatetruecolor(
$this->_options['canvas']['width'],
$this->_options['canvas']['height']
);
break;
case (is_array($this->_options['canvas']) &&
isset($this->_options['canvas']['size']) &&
($this->_options['canvas']['size'] = 'auto')):
case (is_string($this->_options['canvas']) &&
($this->_options['canvas'] = 'auto')):
$this->_mode = 'auto';
break;
default:
throw new Image_Text_Exception('Could not create image canvas.');
}
if ($this->_img) {
$this->_options['canvas'] = array();
$this->_options['canvas']['width'] = imagesx($this->_img);
$this->_options['canvas']['height'] = imagesy($this->_img);
}
if ($this->_options['enable_alpha']) {
imagesavealpha($this->_img, true);
imagealphablending($this->_img, false);
}
if ($this->_options['background_color'] === null) {
$this->_options['enable_alpha'] = true;
imagesavealpha($this->_img, true);
imagealphablending($this->_img, false);
$colBg = imagecolorallocatealpha($this->_img, 255, 255, 255, 127);
} else {
$arBg = $this->convertString2RGB($this->_options['background_color']);
if ($arBg === false) {
throw new Image_Text_Exception('Background color is invalid.');
}
$colBg = imagecolorallocatealpha(
$this->_img, $arBg['r'], $arBg['g'], $arBg['b'], $arBg['a']
);
}
if ($image_canvas === false) {
imagefilledrectangle(
$this->_img,
0, 0,
$this->_options['canvas']['width'] - 1,
$this->_options['canvas']['height'] - 1,
$colBg
);
}
// Save and repair angle
$angle = $this->_options['angle'];
while ($angle < 0) {
$angle += 360;
}
if ($angle > 359) {
$angle = $angle % 360;
}
$this->_options['angle'] = $angle;
// Set the color values
$this->setColors($this->_options['color']);
$this->_lines = null;
// Initialization is complete
$this->_init = true;
}
/**
* Auto measurize text
*
* Automatically determines the greatest possible font size to fit the text into
* the text box. This method may be very resource intensive on your webserver. A
* good tweaking point are the $start and $end parameters, which specify the
* range of font sizes to search through. Anyway, the results should be cached if
* possible. You can optionally set $start and $end here as a parameter or the
* settings of the options array are used.
*
* @param int|bool $start Fontsize to start testing with.
* @param int|bool $end Fontsize to end testing with.
*
* @return int Fontsize measured
* @see Image_Text::measurize()
* @throws Image_Text_Exception
* @todo Beware of initialize
*/
public function autoMeasurize($start = false, $end = false)
{
if (!$this->_init) {
throw new Image_Text_Exception('Not initialized. Call ->init() first!');
}
$start = (empty($start)) ? $this->_options['min_font_size'] : $start;
$end = (empty($end)) ? $this->_options['max_font_size'] : $end;
// Run through all possible font sizes until a measurize fails
// Not the optimal way. This can be tweaked!
for ($i = $start; $i <= $end; $i++) {
$this->_options['font_size'] = $i;
$res = $this->measurize();
if ($res === false) {
if ($start == $i) {
$this->_options['font_size'] = -1;
throw new Image_Text_Exception("No possible font size found");
}
$this->_options['font_size'] -= 1;
$this->_measurizedSize = $this->_options['font_size'];
break;
}
// Always the last couple of lines is stored here.
$this->_lines = $res;
}
return $this->_options['font_size'];
}
/**
* Measurize text into the text box
*
* This method makes your text fit into the defined textbox by measurizing the
* lines for your given font-size. You can do this manually before rendering (or
* use even Image_Text::autoMeasurize()) or the renderer will do measurizing
* automatically.
*
* @param bool $force Optionally, default is false, set true to force
* measurizing.
*
* @return array Array of measured lines.
* @see Image_Text::autoMeasurize()
* @throws Image_Text_Exception
*/
public function measurize($force = false)
{
if (!$this->_init) {
throw new Image_Text_Exception('Not initialized. Call ->init() first!');
}
$this->_processText();
// Precaching options
$font = $this->_font;
$size = $this->_options['font_size'];
$space = (1 + $this->_options['line_spacing'])
* $this->_options['font_size'];
$max_lines = (int)$this->_options['max_lines'];
if (($max_lines < 1) && !$force) {
return false;
}
$block_width = $this->_options['width'];
$block_height = $this->_options['height'];
$colors_cnt = sizeof($this->_colors);
$text_line = '';
$lines_cnt = 0;
$lines = array();
$text_height = 0;
$text_width = 0;
$i = 0;
$para_cnt = 0;
$width = 0;
$beginning_of_line = true;
// Run through tokens and order them in lines
foreach ($this->_tokens as $token) {
// Handle new paragraphs
if ($token == "\n") {
$bounds = imagettfbbox($size, 0, $font, $text_line);
if ((++$lines_cnt >= $max_lines) && !$force) {
return false;
}
if ($this->_options['color_mode'] == 'paragraph') {
$c = $this->_colors[$para_cnt % $colors_cnt];
$i++;
} else {
$c = $this->_colors[$i++ % $colors_cnt];
}
$lines[] = array(
'string' => $text_line,
'width' => $bounds[2] - $bounds[0],
'height' => $bounds[1] - $bounds[7],
'bottom_margin' => $bounds[1],
'left_margin' => $bounds[0],
'color' => $c
);
$text_width = max($text_width, ($bounds[2] - $bounds[0]));
$text_height += (int)$space;
if (($text_height > $block_height) && !$force) {
return false;
}
$para_cnt++;
$text_line = '';
$beginning_of_line = true;
continue;
}
// Usual lining up
if ($beginning_of_line) {
$text_line = '';
$text_line_next = $token;
$beginning_of_line = false;
} else {
$text_line_next = $text_line . ' ' . $token;
}
$bounds = imagettfbbox($size, 0, $font, $text_line_next);
$prev_width = isset($prev_width) ? $width : 0;
$width = $bounds[2] - $bounds[0];
// Handling of automatic new lines
if ($width > $block_width) {
if ((++$lines_cnt >= $max_lines) && !$force) {
return false;
}
if ($this->_options['color_mode'] == 'line') {
$c = $this->_colors[$i++ % $colors_cnt];
} else {
$c = $this->_colors[$para_cnt % $colors_cnt];
$i++;
}
$lines[] = array(
'string' => $text_line,
'width' => $prev_width,
'height' => $bounds[1] - $bounds[7],
'bottom_margin' => $bounds[1],
'left_margin' => $bounds[0],
'color' => $c
);
$text_width = max($text_width, ($bounds[2] - $bounds[0]));
$text_height += (int)$space;
if (($text_height > $block_height) && !$force) {
return false;
}
$text_line = $token;
$bounds = imagettfbbox($size, 0, $font, $text_line);
$width = $bounds[2] - $bounds[0];
$beginning_of_line = false;
} else {
$text_line = $text_line_next;
}
}
// Store remaining line
$bounds = imagettfbbox($size, 0, $font, $text_line);
$i++;
if ($this->_options['color_mode'] == 'line') {
$c = $this->_colors[$i % $colors_cnt];
} else {
$c = $this->_colors[$para_cnt % $colors_cnt];
}
$lines[] = array(
'string' => $text_line,
'width' => $bounds[2] - $bounds[0],
'height' => $bounds[1] - $bounds[7],
'bottom_margin' => $bounds[1],
'left_margin' => $bounds[0],
'color' => $c
);
// add last line height, but without the line-spacing
$text_height += $this->_options['font_size'];
$text_width = max($text_width, ($bounds[2] - $bounds[0]));
if (($text_height > $block_height) && !$force) {
return false;
}
$this->_realTextSize = array(
'width' => $text_width, 'height' => $text_height
);
$this->_measurizedSize = $this->_options['font_size'];
return $lines;
}
/**
* Render the text in the canvas using the given options.
*
* This renders the measurized text or automatically measures it first. The
* $force parameter can be used to switch of measurizing problems (this may cause
* your text being rendered outside a given text box or destroy your image
* completely).
*
* @param bool $force Optional, initially false, set true to silence measurize
* errors.
*
* @return void
* @throws Image_Text_Exception
*/
public function render($force = false)
{
if (!$this->_init) {
throw new Image_Text_Exception('Not initialized. Call ->init() first!');
}
if (!$this->_tokens) {
$this->_processText();
}
if (empty($this->_lines)
|| ($this->_measurizedSize != $this->_options['font_size'])
) {
$this->_lines = $this->measurize($force);
}
$lines = $this->_lines;
if ($this->_mode === 'auto') {
$this->_img = imagecreatetruecolor(
$this->_realTextSize['width'],
$this->_realTextSize['height']
);
if (!$this->_img) {
throw new Image_Text_Exception('Could not create image canvas.');
}
$this->_mode = '';
$this->setColors($this->_options['color']);
}
$block_width = $this->_options['width'];
$max_lines = $this->_options['max_lines'];
$angle = $this->_options['angle'];
$radians = round(deg2rad($angle), 3);
$font = $this->_font;
$size = $this->_options['font_size'];
$line_spacing = $this->_options['line_spacing'];
$align = $this->_options['halign'];
$offset = $this->_getOffset();
$start_x = $offset['x'];
$start_y = $offset['y'];
$sinR = sin($radians);
$cosR = cos($radians);
switch ($this->_options['valign']) {
case self::IMAGE_TEXT_ALIGN_TOP:
$valign_space = 0;
break;
case self::IMAGE_TEXT_ALIGN_MIDDLE:
$valign_space = ($this->_options['height']
- $this->_realTextSize['height']) / 2;
break;
case self::IMAGE_TEXT_ALIGN_BOTTOM:
$valign_space = $this->_options['height']
- $this->_realTextSize['height'];
break;
default:
$valign_space = 0;
}
$space = (1 + $line_spacing) * $size;
// Adjustment of align + translation of top-left-corner to bottom-left-corner
// of first line
$new_posx = $start_x + ($sinR * ($valign_space + $size));
$new_posy = $start_y + ($cosR * ($valign_space + $size));
$lines_cnt = min($max_lines, sizeof($lines));
$bboxes = array();
// Go thorugh lines for rendering
for ($i = 0; $i < $lines_cnt; $i++) {
// Calc the new start X and Y (only for line>0)
// the distance between the line above is used
if ($i > 0) {
$new_posx += $sinR * $space;
$new_posy += $cosR * $space;
}
// Calc the position of the 1st letter. We can then get the left and
// bottom margins 'i' is really not the same than 'j' or 'g'.
$left_margin = $lines[$i]['left_margin'];
$line_width = $lines[$i]['width'];
// Calc the position using the block width, the current line width and
// obviously the angle. That gives us the offset to slide the line.
switch ($align) {
case self::IMAGE_TEXT_ALIGN_LEFT:
$hyp = 0;
break;
case self::IMAGE_TEXT_ALIGN_RIGHT:
$hyp = $block_width - $line_width - $left_margin;
break;
case self::IMAGE_TEXT_ALIGN_CENTER:
$hyp = ($block_width - $line_width) / 2 - $left_margin;
break;
default:
$hyp = 0;
break;
}
$posx = $new_posx + $cosR * $hyp;
$posy = $new_posy - $sinR * $hyp;
$c = $lines[$i]['color'];
// Render textline
$bboxes[] = imagettftext(
$this->_img, $size, $angle, $posx, $posy,
$c, $font, $lines[$i]['string']
);
}
$this->_bbox = $bboxes;
}
/**
* Return the image ressource.
*
* Get the image canvas.
*
* @return resource Used image resource
*/
public function getImg()
{
return $this->_img;
}
/**
* Display the image (send it to the browser).
*
* This will output the image to the users browser. You can use the standard
* IMAGETYPE_* constants to determine which image type will be generated.
* Optionally you can save your image to a destination you set in the options.
*
* @param bool $save Save or not the image on printout.
* @param bool $free Free the image on exit.
*
* @return bool True on success
* @see Image_Text::save()
* @throws Image_Text_Exception
*/
public function display($save = false, $free = false)
{
if (!headers_sent()) {
header(
"Content-type: " .
image_type_to_mime_type($this->_options['image_type'])
);
} else {
throw new Image_Text_Exception('Header already sent.');
}
switch ($this->_options['image_type']) {
case IMAGETYPE_PNG:
$imgout = 'imagepng';
break;
case IMAGETYPE_JPEG:
$imgout = 'imagejpeg';
break;
case IMAGETYPE_BMP:
$imgout = 'imagebmp';
break;
default:
throw new Image_Text_Exception('Unsupported image type.');
}
if ($save) {
$imgout($this->_img);
$this->save();
} else {
$imgout($this->_img);
}
if ($free) {
$res = imagedestroy($this->_img);
if (!$res) {
throw new Image_Text_Exception('Destroying image failed.');
}
}
}
/**
* Save image canvas.
*
* Saves the image to a given destination. You can leave out the destination file
* path, if you have the option for that set correctly. Saving is possible with
* the display() method, too.
*
* @param bool|string $destFile The destination to save to (optional, uses
* options value else).
*
* @see Image_Text::display()
* @return void
* @throws Image_Text_Exception
*/
public function save($destFile = false)
{
if (!$destFile) {
$destFile = $this->_options['dest_file'];
}
if (!$destFile) {
throw new Image_Text_Exception("Invalid desitination file.");
}
switch ($this->_options['image_type']) {
case IMAGETYPE_PNG:
$imgout = 'imagepng';
break;
case IMAGETYPE_JPEG:
$imgout = 'imagejpeg';
break;
case IMAGETYPE_BMP:
$imgout = 'imagebmp';
break;
default:
throw new Image_Text_Exception('Unsupported image type.');
break;
}
$res = $imgout($this->_img, $destFile);
if (!$res) {
throw new Image_Text_Exception('Saving file failed.');
}
}
/**
* Get completely translated offset for text rendering.
*
* Get completely translated offset for text rendering. Important for usage of
* center coords and angles.
*
* @return array Array of x/y coordinates.
*/
private function _getOffset()
{
// Presaving data
$width = $this->_options['width'];
$height = $this->_options['height'];
$angle = $this->_options['angle'];
$x = $this->_options['x'];
$y = $this->_options['y'];
// Using center coordinates
if (!empty($this->_options['cx']) && !empty($this->_options['cy'])) {
$cx = $this->_options['cx'];
$cy = $this->_options['cy'];
// Calculation top left corner
$x = $cx - ($width / 2);
$y = $cy - ($height / 2);
// Calculating movement to keep the center point on himslf after rotation
if ($angle) {
$ang = deg2rad($angle);
// Vector from the top left cornern ponting to the middle point
$vA = array(($cx - $x), ($cy - $y));
// Matrix to rotate vector
// sinus and cosinus
$sin = round(sin($ang), 14);
$cos = round(cos($ang), 14);
// matrix
$mRot = array(
$cos, (-$sin),
$sin, $cos
);
// Multiply vector with matrix to get the rotated vector
// This results in the location of the center point after rotation
$vB = array(
($mRot[0] * $vA[0] + $mRot[2] * $vA[0]),
($mRot[1] * $vA[1] + $mRot[3] * $vA[1])
);
// To get the movement vector, we subtract the original middle
$vC = array(
($vA[0] - $vB[0]),
($vA[1] - $vB[1])
);
// Finally we move the top left corner coords there
$x += $vC[0];
$y += $vC[1];
}
}
return array('x' => (int)round($x, 0), 'y' => (int)round($y, 0));
}
/**
* Convert a color to an array.
*
* The following colors syntax must be used:
* "#08ffff00" hexadecimal format with alpha channel (08)
*
* @param string $scolor string of colorcode.
*
* @see Image_Text::IMAGE_TEXT_REGEX_HTMLCOLOR
* @return bool|array false if string can't be converted to array
*/
public static function convertString2RGB($scolor)
{
if (preg_match(self::IMAGE_TEXT_REGEX_HTMLCOLOR, $scolor, $matches)) {
return array(
'r' => hexdec($matches[2]),
'g' => hexdec($matches[3]),
'b' => hexdec($matches[4]),
'a' => hexdec(!empty($matches[1]) ? $matches[1] : 0),
);
}
return false;
}
/**
* Extract the tokens from the text.
*
* @return void
*/
private function _processText()
{
if (!isset($this->_text)) {
return;
}
$this->_tokens = array();
// Normalize linebreak to "\n"
$this->_text = preg_replace("[\r\n]", "\n", $this->_text);
// Get each paragraph
$paras = explode("\n", $this->_text);
// loop though the paragraphs
// and get each word (token)
foreach ($paras as $para) {
$words = explode(' ', $para);
foreach ($words as $word) {
$this->_tokens[] = $word;
}
// add a "\n" to mark the end of a paragraph
$this->_tokens[] = "\n";
}
// we do not need an end paragraph as the last token
array_pop($this->_tokens);
}
}
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