function view_image($id = null)
{
if (is_numeric($id)) {
$question = $this->Question->findById($id);
$line_count = 0;
// array of lines
$question_text = array();
// Other kinds of newlines causing problems.
$question['Question']['question'] = str_replace(array("\r", "\r\n", "\n"), '\\n', $question['Question']['question']);
$question_wrapped = wordwrap(strip_tags(QH_urldecode($question['Question']['question'])), $this->number_of_characters, '\\n', true);
$question_text = array_merge($question_text, explode('\\n', $question_wrapped));
$line_count += count($question_text);
$answers = Set::combine($question['Answer'], '{n}.order', '{n}.answer');
$answer_text = array();
foreach ($answers as $answer) {
$answer_wrapped = wordwrap(strip_tags($answer), $this->number_of_characters - 4, '\\n', true);
$line_array = explode('\\n', $answer_wrapped);
$answer_text[] = $line_array;
$line_count += count($line_array);
}
$box_height = $this->padding * 2 + $this->line_height * $line_count;
$box_width = $this->padding * 2 + $this->number_of_characters * $this->character_width;
$image = imagecreatetruecolor($box_width, $box_height);
$background = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $background);
$black = imagecolorallocate($image, 0, 0, 0);
imagerectangle($image, 0, 0, $box_width - 1, $box_height - 1, $black);
$y = $this->padding + $this->character_height;
foreach ($question_text as $line) {
imagettftext($image, $this->font_size, 0, $this->padding, $y, $black, APP . 'Lib/unifont_5.1.20080907.ttf', html_entity_decode($line));
// h_e_d for preventing in the image... sometimes. Not clear on that, but
// this fixed #206.
$y += $this->line_height;
}
foreach ($answer_text as $order => $answer) {
if ($order == $question['Question']['correct_answer']) {
imagefilledellipse($image, $this->character_width * 3, $y - $this->character_height / 2, 8, 8, $black);
} else {
imageellipse($image, $this->character_width * 3, $y - $this->character_height / 2, 8, 8, $black);
}
foreach ($answer as $answer_line) {
$answer_line = ' ' . $answer_line;
imagettftext($image, $this->font_size, 0, $this->padding, $y, $black, APP . 'Lib/unifont_5.1.20080907.ttf', $answer_line);
$y += $this->line_height;
}
}
$this->layout = 'image';
header("Content-type: image/png");
imagepng($image);
imagedestroy($image);
$this->autoRender = false;
}
}
function view_text_box_image($type = 'one-line', $text = '')
{
$this->layout = 'image';
$text = QH_urldecode($text);
if ($type == 'one-line' || $type == 'multi-line') {
$string = ucfirst($type);
if (!empty($text)) {
$string .= ' free response: ' . $text;
}
} else {
$string = 'Image creation error!';
}
$string = wordwrap(strip_tags($string), $this->number_of_characters, '\\n', true);
$text = explode('\\n', $string);
$number_of_lines = count($text);
$box_height = $this->padding + $this->line_height * $number_of_lines;
$box_width = $this->padding * 2 + $this->number_of_characters * $this->character_width;
$image = imagecreatetruecolor($box_width, $box_height);
$black = imagecolorallocate($image, 0, 0, 0);
$white = imagecolorallocate($image, 255, 255, 255);
imagefill($image, 0, 0, $white);
imagerectangle($image, 0, 0, $box_width - 1, $box_height - 1, $black);
$y = $this->padding + $this->character_height;
foreach ($text as $line) {
imagettftext($image, $this->font_size, 0, $this->padding, $y, $black, APP . 'Lib/unifont_5.1.20080907.ttf', $line);
$y += $this->line_height;
}
header("Content-type: image/png");
imagepng($image);
imagedestroy($image);
$this->autoRender = false;
}
protected function _generateTextBoxHTML($matches)
{
$uuid = $this->uuid();
$type = htmlentities($matches[1], ENT_QUOTES, 'UTF-8');
$matches[2] = QH_urldecode(strip_tags($matches[2], allowed_tags('strip_tags')));
$matches[3] = QH_urldecode(strip_tags($matches[3], allowed_tags('strip_tags')));
$prompt = htmlentities($matches[2], ENT_QUOTES, 'UTF-8');
$placeholder = htmlentities($matches[3], ENT_QUOTES, 'UTF-8');
$name = "free-response[{$uuid}][{$prompt}]";
if ('one-line' == $type) {
return "<label for='{$name}'>{$prompt}<br /><input placeholder='{$placeholder}' class='text-box' name='{$name}' /></label>";
} elseif ('multi-line' == $type) {
return "<label for='{$name}'>{$prompt}<br /><textarea placeholder='{$placeholder}' " . "class='text-box' name='{$name}'></textarea></label>";
}
}
protected function _parseTextBoxes($step_content)
{
$text_box_pattern = '/\\<img[^>]*class\\="text-box"[^>]*src\\="tutorials\\/view_text_box_image\\/([^\\/]+)\\/([^"]+)"[^>]*>/';
$step_content = QH_urldecode(preg_replace_callback($text_box_pattern, array($this, '_generateTextBoxHTML'), $step_content));
return $step_content;
}
