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Файловый менеджер - Редактировать - /home/lmsyaran/public_html/j3/modules/mod_vertical_menu/classes/ImageHelper.php

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<?php /** * mod_vertical_menu - Vertical Menu * * @author Balint Polgarfi * @copyright 2014-2019 Offlajn.com All Rights Reserved * @license https://gnu.org/licenses/gpl-2.0.html * @link https://offlajn.com / defined('_JEXEC') or die('Restricted access'); if (!class_exists('OfflajnHelper7')) { require_once dirname(__FILE__) . '/ColorHelper.php'; class OfflajnHelper7 { public $cache; public $step = 1; public $c; public function __construct($cacheDir) { $this->cache = $cacheDir; $this->c = new OfflajnColor(); } public function generateRoundedCorner($r, $hex) { $r = $r 2 - 4; $rgb = $this->rgb2array($hex); $imnew = imagecreatetruecolor($r * 2 + 10, $r * 2 + 10); imagealphablending($imnew, false); imagesavealpha($imnew, true); $transparent = imagecolorallocatealpha($imnew, 255, 255, 255, 127); imagefilledrectangle($imnew, 0, 0, $r * 2 + 10, $r * 2 + 10, $transparent); $white = imagecolorallocate($imnew, 0, 0, 0); $this->imageSmoothArc($imnew, $r, $r, $r * 2, $r * 2, $white, 0, M_PI * 2); for ($x = 0; $x < $r * 2 + 10; $x++) { for ($y = 0; $y < $r * 2 + 10; $y++) { $rgba = ImageColorAt($imnew, $x, $y); $A = ($rgba >> 24) & 0xFF; if ($A == 127) { imagesetpixel($imnew, $x, $y, imagecolorallocatealpha($imnew, $rgb[0], $rgb[1], $rgb[2], 0)); } else { imagesetpixel($imnew, $x, $y, imagecolorallocatealpha($imnew, $rgb[0], $rgb[1], $rgb[2], -$A + 127)); } } } $img = array(); $imtl = imagecreatetruecolor($r, $r); imagealphablending($imtl, false); imagesavealpha($imtl, true); $transparent = imagecolorallocatealpha($imtl, 255, 255, 255, 127); imagefilledrectangle($imtl, 0, 0, $r, $r, $transparent); imagecopyresampled($imtl, $imnew, 0, 0, 0, 0, $r, $r, $r, $r); $img[] = $hash = md5($r . $hex) . 'tl.png'; imagepng($imtl, $this->cache . '/' . $hash); imagedestroy($imtl); $imtr = imagecreatetruecolor($r, $r); imagealphablending($imtr, false); imagesavealpha($imtr, true); $transparent = imagecolorallocatealpha($imtr, 255, 255, 255, 127); imagefilledrectangle($imtr, 0, 0, $r, $r, $transparent); imagecopyresampled($imtr, $imnew, 0, 0, $r + 2, 0, $r, $r, $r, $r); $img[] = $hash = md5($r . $hex) . 'tr.png'; imagepng($imtr, $this->cache . '/' . $hash); imagedestroy($imtr); $imbl = imagecreatetruecolor($r, $r); imagealphablending($imbl, false); imagesavealpha($imbl, true); $transparent = imagecolorallocatealpha($imbl, 255, 255, 255, 127); imagefilledrectangle($imbl, 0, 0, $r, $r, $transparent); imagecopyresampled($imbl, $imnew, 0, 0, 0, $r + 2, $r, $r, $r, $r); $img[] = $hash = md5($r . $hex) . 'bl.png'; imagepng($imbl, $this->cache . '/' . $hash); imagedestroy($imbl); $imbr = imagecreatetruecolor($r, $r); imagealphablending($imbr, false); imagesavealpha($imbr, true); $transparent = imagecolorallocatealpha($imbr, 255, 255, 255, 127); imagefilledrectangle($imbr, 0, 0, $r, $r, $transparent); imagecopyresampled($imbr, $imnew, 0, 0, $r + 2, $r + 2, $r, $r, $r, $r); $img[] = $hash = md5($r . $hex) . 'br.png'; imagepng($imbr, $this->cache . '/' . $hash); imagedestroy($imbr); imagedestroy($imnew); return $img; } public function ColorizeImage($img, $hex) { $im = imagecreatefrompng($img); $height = imagesy($im); $width = imagesx($im); $imnew = imagecreatetruecolor($width, $height); imagealphablending($imnew, false); imagesavealpha($imnew, true); $transparent = imagecolorallocatealpha($imnew, 255, 255, 255, 127); imagefilledrectangle($imnew, 0, 0, $width, $height, $transparent); $rgb = $this->rgb2array($hex); for ($x = 0; $x < $width; $x++) { for ($y = 0; $y < $height; $y++) { $rgba = ImageColorAt($im, $x, $y); $R = (($rgba >> 16) & 0xFF) + $rgb[0]; $G = (($rgba >> 8) & 0xFF) + $rgb[1]; $B = ($rgba & 0xFF) + $rgb[2]; $A = ($rgba >> 24) & 0xFF; if ($R > 255) { $R = 255; } if ($G > 255) { $G = 255; } if ($B > 255) { $B = 255; } imagesetpixel($imnew, $x, $y, imagecolorallocatealpha($imnew, $R, $G, $B, $A)); } } $hash = md5($img . $hex) . '.png'; imagepng($imnew, $this->cache . '/' . $hash); imagedestroy($imnew); imagedestroy($im); return $hash; } public function NewColorizeImage($img, $targetColor, $baseColor) { if ($targetColor == '#000000') { $targetColor = '#000001'; } $img = str_replace(JURI::root(), JPATH_BASE . '/', $img); if (strpos($img, JPATH_BASE) !== 0) { $img = JPATH_BASE . $img; } $img = preg_replace('~//+~', '/', $img); $targetHexArr = $this->c->hex82hex($targetColor); $targetColor = $targetHexArr[0]; $alpha = $targetHexArr[1]; $c1 = $this->c->hex2hsl($baseColor); $c2 = $this->c->hex2hsl($targetColor); $im = imagecreatefrompng($img); $height = imagesy($im); $width = imagesx($im); $imnew = imagecreatetruecolor($width, $height); imagealphablending($imnew, false); imagesavealpha($imnew, true); $transparent = imagecolorallocatealpha($imnew, 255, 255, 255, 127); imagefilledrectangle($imnew, 0, 0, $width, $height, $transparent); $rgb = $this->rgb2array($targetColor); for ($x = 0; $x < $width; $x++) { for ($y = 0; $y < $height; $y++) { $rgba = ImageColorAt($im, $x, $y); $rgb = array((($rgba >> 16) & 0xFF), (($rgba >> 8) & 0xFF), $rgba & 0xFF); $hsl = $this->c->rgb2hsl($rgb); $a[0] = $hsl[0] + ($c2[0] - $c1[0]); $a[1] = $hsl[1] * ($c2[1] / $c1[1]); if ($a[1] > 1) { $a[1] = 1; } $a[2] = exp(log($hsl[2]) * log($c2[2]) / log($c1[2])); if ($a[2] > 1) { $a[2] = 1; } $rgb = $this->c->hsl2rgb($a); $A = 0xFE - (($rgba >> 24) * 2) & 0xFF; $A = (int) ($A * (hexdec($alpha) / 0xFE)); if ($A > 0xFF) { $A = 0xFF; } $A = (int) ((0xFE - $A) / 2); imagesetpixel($imnew, $x, $y, imagecolorallocatealpha($imnew, $rgb[0], $rgb[1], $rgb[2], $A)); } } $hash = md5($img . $targetColor . $alpha) . '.png'; imagepng($imnew, $this->cache . '/' . $hash); imagedestroy($imnew); imagedestroy($im); return $hash; } public function generateAlphaColor($c) { $im = imagecreatetruecolor(1, 1); imagealphablending($im, false); imagesavealpha($im, true); $transparent = imagecolorallocatealpha($im, 255, 255, 255, 127); imagefilledrectangle($im, 0, 0, 1, 1, $transparent); $color = $this->c->hex2rgba($c); $fillcolor = imagecolorallocatealpha($im, $color[0], $color[1], $color[2], 127 - $color[3]); imagefilledrectangle($im, 0, 0, 1, 1, $fillcolor); $hash = md5($c) . '.png'; imagepng($im, $this->cache . '/' . $hash); imagedestroy($im); return $hash; } public function generateGradient($w, $h, $c1, $c2, $direction) { $im = imagecreatetruecolor($w, $h); $this->fill($im, $direction, $c1, $c2); $hash = md5($w . $h . $c1 . $c2 . $direction) . '.png'; imagepng($im, $this->cache . '/' . $hash); imagedestroy($im); return $hash; } public function fill($im, $direction, $start, $end) { switch ($direction) { case 'horizontal': $line_numbers = imagesx($im); $line_width = imagesy($im); list($r1, $g1, $b1) = $this->hex2rgb($start); list($r2, $g2, $b2) = $this->hex2rgb($end); break; case 'vertical': $line_numbers = imagesy($im); $line_width = imagesx($im); list($r1, $g1, $b1) = $this->hex2rgb($start); list($r2, $g2, $b2) = $this->hex2rgb($end); break; case 'ellipse': $width = imagesx($im); $height = imagesy($im); $rh = $height > $width ? 1 : $width / $height; $rw = $width > $height ? 1 : $height / $width; $line_numbers = min($width, $height); $center_x = $width / 2; $center_y = $height / 2; list($r1, $g1, $b1) = $this->hex2rgb($end); list($r2, $g2, $b2) = $this->hex2rgb($start); imagefilledrectangle($im, 0, 0, $width, $height, imagecolorallocate($im, $r1, $g1, $b1)); break; case 'ellipse2': $width = imagesx($im); $height = imagesy($im); $rh = $height > $width ? 1 : $width / $height; $rw = $width > $height ? 1 : $height / $width; $line_numbers = sqrt(pow($width, 2) + pow($height, 2)); $center_x = $width / 2; $center_y = $height / 2; list($r1, $g1, $b1) = $this->hex2rgb($end); list($r2, $g2, $b2) = $this->hex2rgb($start); break; case 'circle': $width = imagesx($im); $height = imagesy($im); $line_numbers = sqrt(pow($width, 2) + pow($height, 2)); $center_x = $width / 2; $center_y = $height / 2; $rh = $rw = 1; list($r1, $g1, $b1) = $this->hex2rgb($end); list($r2, $g2, $b2) = $this->hex2rgb($start); break; case 'circle2': $width = imagesx($im); $height = imagesy($im); $line_numbers = min($width, $height); $center_x = $width / 2; $center_y = $height / 2; $rh = $rw = 1; list($r1, $g1, $b1) = $this->hex2rgb($end); list($r2, $g2, $b2) = $this->hex2rgb($start); imagefilledrectangle($im, 0, 0, $width, $height, imagecolorallocate($im, $r1, $g1, $b1)); break; case 'square': case 'rectangle': $width = imagesx($im); $height = imagesy($im); $line_numbers = max($width, $height) / 2; list($r1, $g1, $b1) = $this->hex2rgb($end); list($r2, $g2, $b2) = $this->hex2rgb($start); break; case 'diamond': list($r1, $g1, $b1) = $this->hex2rgb($end); list($r2, $g2, $b2) = $this->hex2rgb($start); $width = imagesx($im); $height = imagesy($im); $rh = $height > $width ? 1 : $width / $height; $rw = $width > $height ? 1 : $height / $width; $line_numbers = min($width, $height); break; } for ($i = 0; $i < $line_numbers; $i = $i + 1 + $this->step) { // old values : $old_r = isset($r) ? $r : null; $old_g = isset($g) ? $g : null; $old_b = isset($b) ? $b : null; // new values : $r = ($r2 - $r1 != 0) ? intval($r1 + ($r2 - $r1) * ($i / $line_numbers)) : $r1; $g = ($g2 - $g1 != 0) ? intval($g1 + ($g2 - $g1) * ($i / $line_numbers)) : $g1; $b = ($b2 - $b1 != 0) ? intval($b1 + ($b2 - $b1) * ($i / $line_numbers)) : $b1; // if new values are really new ones, allocate a new color, otherwise reuse previous color. // There's a "feature" in imagecolorallocate that makes this function // always returns '-1' after 255 colors have been allocated in an image that was created with // imagecreate (everything works fine with imagecreatetruecolor) if ("$old_r,$old_g,$old_b" != "$r,$g,$b") { $fill = imagecolorallocate($im, $r, $g, $b); } switch ($direction) { case 'vertical': imagefilledrectangle($im, 0, $i, $line_width, $i + $this->step, $fill); break; case 'horizontal': imagefilledrectangle($im, $i, 0, $i + $this->step, $line_width, $fill); break; case 'ellipse': case 'ellipse2': case 'circle': case 'circle2': imagefilledellipse($im, $center_x, $center_y, ($line_numbers - $i) * $rh, ($line_numbers - $i) * $rw, $fill); break; case 'square': case 'rectangle': imagefilledrectangle($im, $i * $width / $height, $i * $height / $width, $width - ($i * $width / $height), $height - ($i * $height / $width), $fill); break; case 'diamond': imagefilledpolygon($im, array( $width / 2, $i * $rw - 0.5 * $height, $i * $rh - 0.5 * $width, $height / 2, $width / 2, 1.5 * $height - $i * $rw, 1.5 * $width - $i * $rh, $height / 2, ), 4, $fill); break; } } } // #ff00ff -> array(255,0,255) or #f0f -> array(255,0,255) public function hex2rgb($color) { $color = str_replace('#', '', $color); $s = strlen($color) / 3; $rgb[] = hexdec(str_repeat(substr($color, 0, $s), 2 / $s)); $rgb[] = hexdec(str_repeat(substr($color, $s, $s), 2 / $s)); $rgb[] = hexdec(str_repeat(substr($color, 2 * $s, $s), 2 / $s)); return $rgb; } /* Param: ff0000 / public function rgb2array($rgb) { return array( base_convert(substr($rgb, 0, 2), 16, 10), base_convert(substr($rgb, 2, 2), 16, 10), base_convert(substr($rgb, 4, 2), 16, 10), ); } public function imageSmoothArcDrawSegment(&$img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $start, $stop, $seg) { // Originally written from scratch by Ulrich Mierendorff, 06/2006 // Rewritten and improved, 04/2007, 07/2007 // Please do not use THIS function directly. Scroll down to imageSmoothArc(...). $fillColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], $color[3]); $xStart = abs($a cos($start)); $yStart = abs($b * sin($start)); $xStop = abs($a * cos($stop)); $yStop = abs($b * sin($stop)); $dxStart = 0; $dyStart = 0; $dxStop = 0; $dyStop = 0; if ($xStart != 0) { $dyStart = $yStart / $xStart; } if ($xStop != 0) { $dyStop = $yStop / $xStop; } if ($yStart != 0) { $dxStart = $xStart / $yStart; } if ($yStop != 0) { $dxStop = $xStop / $yStop; } if (abs($xStart) >= abs($yStart)) { $aaStartX = true; } else { $aaStartX = false; } if ($xStop >= $yStop) { $aaStopX = true; } else { $aaStopX = false; } //$xp = +1; $yp = -1; $xa = +1; $ya = 0; for ($x = 0; $x < $a; $x += 1) { /$y = $b sqrt( 1 - ($x$x)/($a$a) ); $error = $y - (int)($y); $y = (int)($y); $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])$error );/ $_y1 = $dyStop * $x; $_y2 = $dyStart * $x; if ($xStart > $xStop) { $error1 = $_y1 - (int) ($_y1); $error2 = 1 - $_y2 + (int) $_y2; $_y1 = $_y1 - $error1; $_y2 = $_y2 + $error2; } else { $error1 = 1 - $_y1 + (int) $_y1; $error2 = $_y2 - (int) ($_y2); $_y1 = $_y1 + $error1; $_y2 = $_y2 - $error2; } /* if ($aaStopX) $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])$error1 ); if ($aaStartX) $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])$error2 ); / if ($seg == 0 \|\| $seg == 2) { $i = $seg; if (!($start > $i M_PI / 2 && $x > $xStart)) { if ($i == 0) { $xp = +1; $yp = -1; $xa = +1; $ya = 0; } else { $xp = -1; $yp = +1; $xa = 0; $ya = +1; } if ($stop < ($i + 1) * (M_PI / 2) && $x <= $xStop) { $diffColor1 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error1); $y1 = $_y1;if ($aaStopX) { imageSetPixel($img, $cx + $xp * ($x) + $xa, $cy + $yp * ($y1 + 1) + $ya, $diffColor1); } } else { $y = $b * sqrt(1 - ($x * $x) / ($a * $a)); $error = $y - (int) ($y); $y = (int) ($y); $diffColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error); $y1 = $y;if ($x < $aaAngleX) { imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y1 + 1) + $ya, $diffColor); } } if ($start > $i * M_PI / 2 && $x <= $xStart) { $diffColor2 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error2); $y2 = $_y2;if ($aaStartX) { imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y2 - 1) + $ya, $diffColor2); } } else { $y2 = 0; } if ($y2 <= $y1) { imageLine($img, $cx + $xp * $x + $xa, $cy + $yp * $y1 + $ya, $cx + $xp * $x + $xa, $cy + $yp * $y2 + $ya, $fillColor); } } } if ($seg == 1 \|\| $seg == 3) { $i = $seg; if (!($stop < ($i + 1) * M_PI / 2 && $x > $xStop)) { if ($i == 1) { $xp = -1; $yp = -1; $xa = 0; $ya = 0; } else { $xp = +1; $yp = +1; $xa = 1; $ya = 1; } if ($start > $i * M_PI / 2 && $x < $xStart) { $diffColor2 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error2); $y1 = $_y2;if ($aaStartX) { imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y1 + 1) + $ya, $diffColor2); } } else { $y = $b * sqrt(1 - ($x * $x) / ($a * $a)); $error = $y - (int) ($y); $y = (int) $y; $diffColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error); $y1 = $y;if ($x < $aaAngleX) { imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y1 + 1) + $ya, $diffColor); } } if ($stop < ($i + 1) * M_PI / 2 && $x <= $xStop) { $diffColor1 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error1); $y2 = $_y1;if ($aaStopX) { imageSetPixel($img, $cx + $xp * $x + $xa, $cy + $yp * ($y2 - 1) + $ya, $diffColor1); } } else { $y2 = 0; } if ($y2 <= $y1) { imageLine($img, $cx + $xp * $x + $xa, $cy + $yp * $y1 + $ya, $cx + $xp * $x + $xa, $cy + $yp * $y2 + $ya, $fillColor); } } } } ///YYYYY for ($y = 0; $y < $b; $y += 1) { /$x = $a sqrt( 1 - ($y$y)/($b$b) ); $error = $x - (int)($x); $x = (int)($x); $diffColor = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])$error ); / $_x1 = $dxStop * $y; $_x2 = $dxStart * $y; if ($yStart > $yStop) { $error1 = $_x1 - (int) ($_x1); $error2 = 1 - $_x2 + (int) $_x2; $_x1 = $_x1 - $error1; $_x2 = $_x2 + $error2; } else { $error1 = 1 - $_x1 + (int) $_x1; $error2 = $_x2 - (int) ($_x2); $_x1 = $_x1 + $error1; $_x2 = $_x2 - $error2; } /* if (!$aaStopX) $diffColor1 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])$error1 ); if (!$aaStartX) $diffColor2 = imageColorExactAlpha( $img, $color[0], $color[1], $color[2], 127-(127-$color[3])$error2 ); / if ($seg == 0 \|\| $seg == 2) { $i = $seg; if (!($start > $i M_PI / 2 && $y > $yStop)) { if ($i == 0) { $xp = +1; $yp = -1; $xa = 1; $ya = 0; } else { $xp = -1; $yp = +1; $xa = 0; $ya = 1; } if ($stop < ($i + 1) * (M_PI / 2) && $y <= $yStop) { $diffColor1 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error1); $x1 = $_x1;if (!$aaStopX) { imageSetPixel($img, $cx + $xp * ($x1 - 1) + $xa, $cy + $yp * ($y) + $ya, $diffColor1); } } if ($start > $i * M_PI / 2 && $y < $yStart) { $diffColor2 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error2); $x2 = $_x2;if (!$aaStartX) { imageSetPixel($img, $cx + $xp * ($x2 + 1) + $xa, $cy + $yp * ($y) + $ya, $diffColor2); } } else { $x = $a * sqrt(1 - ($y * $y) / ($b * $b)); $error = $x - (int) ($x); $x = (int) ($x); $diffColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error); $x1 = $x;if ($y < $aaAngleY && $y <= $yStop) { imageSetPixel($img, $cx + $xp * ($x1 + 1) + $xa, $cy + $yp * $y + $ya, $diffColor); } } } } if ($seg == 1 \|\| $seg == 3) { $i = $seg; if (!($stop < ($i + 1) * M_PI / 2 && $y > $yStart)) { if ($i == 1) { $xp = -1; $yp = -1; $xa = 0; $ya = 0; } else { $xp = +1; $yp = +1; $xa = 1; $ya = 1; } if ($start > $i * M_PI / 2 && $y < $yStart) { $diffColor2 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error2); $x1 = $_x2;if (!$aaStartX) { imageSetPixel($img, $cx + $xp * ($x1 - 1) + $xa, $cy + $yp * $y + $ya, $diffColor2); } } if ($stop < ($i + 1) * M_PI / 2 && $y <= $yStop) { $diffColor1 = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error1); $x2 = $_x1;if (!$aaStopX) { imageSetPixel($img, $cx + $xp * ($x2 + 1) + $xa, $cy + $yp * $y + $ya, $diffColor1); } } else { $x = $a * sqrt(1 - ($y * $y) / ($b * $b)); $error = $x - (int) ($x); $x = (int) ($x); $diffColor = imageColorExactAlpha($img, $color[0], $color[1], $color[2], 127 - (127 - $color[3]) * $error); $x1 = $x;if ($y < $aaAngleY && $y < $yStart) { imageSetPixel($img, $cx + $xp * ($x1 + 1) + $xa, $cy + $yp * $y + $ya, $diffColor); } } } } } } public function imageSmoothArc(&$img, $cx, $cy, $w, $h, $color, $start, $stop) { // Originally written from scratch by Ulrich Mierendorff, 06/2006 // Rewritten and improved, 04/2007, 07/2007 // compared to old version: // + Support for transparency added // + Improved quality of edges & antialiasing // note: This function does not represent the fastest way to draw elliptical // arcs. It was written without reading any papers on that subject. Better // algorithms may be twice as fast or even more. // what it cannot do: It does not support outlined arcs, only filled // Parameters: // $cx - Center of ellipse, X-coord // $cy - Center of ellipse, Y-coord // $w - Width of ellipse ($w >= 2) // $h - Height of ellipse ($h >= 2 ) // $color - Color of ellipse as a four component array with RGBA // $start - Starting angle of the arc, no limited range! // $stop - Stop angle of the arc, no limited range! // $start _can_ be greater than $stop! // If any value is not in the given range, results are undefined! // This script does not use any special algorithms, everything is completely // written from scratch; see http://de.wikipedia.org/wiki/Ellipse for formulas. while ($start < 0) { $start += 2 * M_PI; } while ($stop < 0) { $stop += 2 * M_PI; } while ($start > 2 * M_PI) { $start -= 2 * M_PI; } while ($stop > 2 * M_PI) { $stop -= 2 * M_PI; } if ($start > $stop) { $this->imageSmoothArc($img, $cx, $cy, $w, $h, $color, $start, 2 * M_PI); $this->imageSmoothArc($img, $cx, $cy, $w, $h, $color, 0, $stop); return; } $a = 1.0 * round($w / 2); $b = 1.0 * round($h / 2); $cx = 1.0 * round($cx); $cy = 1.0 * round($cy); $aaAngle = atan(($b * $b) / ($a * $a) * tan(0.25 * M_PI)); $aaAngleX = $a * cos($aaAngle); $aaAngleY = $b * sin($aaAngle); $a -= 0.5; // looks better... $b -= 0.5; for ($i = 0; $i < 4; $i++) { if ($start < ($i + 1) * M_PI / 2) { if ($start > $i * M_PI / 2) { if ($stop > ($i + 1) * M_PI / 2) { $this->imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $start, ($i + 1) * M_PI / 2, $i); } else { $this->imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $start, $stop, $i); break; } } else { if ($stop > ($i + 1) * M_PI / 2) { $this->imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $i * M_PI / 2, ($i + 1) * M_PI / 2, $i); } else { $this->imageSmoothArcDrawSegment($img, $cx, $cy, $a, $b, $aaAngleX, $aaAngleY, $color, $i * M_PI / 2, $stop, $i); break; } } } } } } }

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