107 lines
3.7 KiB
PHP
107 lines
3.7 KiB
PHP
<?php
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/**
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* Signature to Image: A supplemental script for Signature Pad that
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* generates an image of the signature’s JSON output server-side using PHP.
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*
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* @project ca.thomasjbradley.applications.signaturetoimage
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* @author Thomas J Bradley <hey@thomasjbradley.ca>
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* @link http://thomasjbradley.ca/lab/signature-to-image
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* @link http://github.com/thomasjbradley/signature-to-image
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* @copyright Copyright MMXI–, Thomas J Bradley
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* @license New BSD License
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* @version 1.1.0
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*/
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/**
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* Accepts a signature created by signature pad in Json format
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* Converts it to an image resource
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* The image resource can then be changed into png, jpg whatever PHP GD supports
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*
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* To create a nicely anti-aliased graphic the signature is drawn 12 times it's original size then shrunken
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*
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* @param string|array $json
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* @param array $options OPTIONAL; the options for image creation
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* imageSize => array(width, height)
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* bgColour => array(red, green, blue) | transparent
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* penWidth => int
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* penColour => array(red, green, blue)
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* drawMultiplier => int
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*
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* @return object
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*/
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ini_set ('memory_limit', '256M');
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function sigJsonToImage ($json, $options = array()) {
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$defaultOptions = array(
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'imageSize' => array(198, 55)
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,'bgColour' => array(0xff, 0xff, 0xff)
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,'penWidth' => 2
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,'penColour' => array(0x14, 0x53, 0x94)
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,'drawMultiplier'=> 12
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);
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$options = array_merge($defaultOptions, $options);
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$img = imagecreatetruecolor($options['imageSize'][0] * $options['drawMultiplier'], $options['imageSize'][1] * $options['drawMultiplier']);
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if ($options['bgColour'] == 'transparent') {
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imagesavealpha($img, true);
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$bg = imagecolorallocatealpha($img, 0, 0, 0, 127);
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} else {
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$bg = imagecolorallocate($img, $options['bgColour'][0], $options['bgColour'][1], $options['bgColour'][2]);
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}
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$pen = imagecolorallocate($img, $options['penColour'][0], $options['penColour'][1], $options['penColour'][2]);
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imagefill($img, 0, 0, $bg);
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if (is_string($json))
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$json = json_decode(stripslashes($json));
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foreach ($json as $v)
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drawThickLine($img, $v->lx * $options['drawMultiplier'], $v->ly * $options['drawMultiplier'], $v->mx * $options['drawMultiplier'], $v->my * $options['drawMultiplier'], $pen, $options['penWidth'] * ($options['drawMultiplier'] / 2));
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$imgDest = imagecreatetruecolor($options['imageSize'][0], $options['imageSize'][1]);
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if ($options['bgColour'] == 'transparent') {
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imagealphablending($imgDest, false);
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imagesavealpha($imgDest, true);
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}
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imagecopyresampled($imgDest, $img, 0, 0, 0, 0, $options['imageSize'][0], $options['imageSize'][0], $options['imageSize'][0] * $options['drawMultiplier'], $options['imageSize'][0] * $options['drawMultiplier']);
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imagedestroy($img);
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return $imgDest;
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}
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/**
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* Draws a thick line
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* Changing the thickness of a line using imagesetthickness doesn't produce as nice of result
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*
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* @param object $img
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* @param int $startX
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* @param int $startY
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* @param int $endX
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* @param int $endY
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* @param object $colour
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* @param int $thickness
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*
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* @return void
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*/
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function drawThickLine ($img, $startX, $startY, $endX, $endY, $colour, $thickness) {
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$angle = (atan2(($startY - $endY), ($endX - $startX)));
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$dist_x = $thickness * (sin($angle));
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$dist_y = $thickness * (cos($angle));
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$p1x = ceil(($startX + $dist_x));
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$p1y = ceil(($startY + $dist_y));
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$p2x = ceil(($endX + $dist_x));
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$p2y = ceil(($endY + $dist_y));
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$p3x = ceil(($endX - $dist_x));
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$p3y = ceil(($endY - $dist_y));
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$p4x = ceil(($startX - $dist_x));
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$p4y = ceil(($startY - $dist_y));
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$array = array(0=>$p1x, $p1y, $p2x, $p2y, $p3x, $p3y, $p4x, $p4y);
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imagefilledpolygon($img, $array, (count($array)/2), $colour);
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}
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