diff options
Diffstat (limited to 'css_shadow.php')
| -rw-r--r-- | css_shadow.php | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/css_shadow.php b/css_shadow.php new file mode 100644 index 0000000..bdd4adb --- /dev/null +++ b/css_shadow.php @@ -0,0 +1,151 @@ +<?php +class css_shadow { + /** Create a point */ + public static function xy($x, $y) { + return array('x'=>$x, 'y'=>$y); + } + + /** Draw a "line" of shadows between two points */ + public static function draw_line($p1, $p2, $steps, $color) { + $x1 = $p1['x']; + $y1 = $p1['y']; + $x2 = $p2['x']; + $y2 = $p2['y']; + + $xstep = ($x2-$x1)/($steps-1); + $ystep = ($y2-$y1)/($steps-1); + + $x = $x1; + $y = $y1; + $str = ''; + for ($i=0; $i<$steps; $i++) { + $str.= sprintf ("\t%fem %fem %s,\n", $x, $y, $color); + $x+=$xstep; + $y+=$ystep; + } + return $str; + } + + /** Connect the dots */ + public static function draw_multiline($points, $steps, $color) { + $str = ''; + foreach ($points as $point) { + if (isset($prev_point)) { + $str.= self::draw_line($prev_point, $point, $steps, $color); + } + $prev_point = $point; + } + return $str; + } + + public static function points_border($args) { + $left = $right = $top = $bottom = $xoffset = $yoffset = 0; + if (isset($args['width'])) { + $left = $right = $top = $bottom = $args['width']; + } + if (isset($args['x'])) { + $left = $right = $args['x']; + } + if (isset($args['y'])) { + $top = $bottom = $args['y']; + } + if (isset($args['left'])) { + $left = $args['left']; + } + if (isset($args['right'])) { + $right = $args['right']; + } + if (isset($args['top'])) { + $top = $args['top']; + } + if (isset($args['bottom'])) { + $bottom = $args['bottom']; + } + if (isset($args['xoffset'])) { + $xoffset = $args['xoffset']; + } + if (isset($args['yoffset'])) { + $yoffset = $args['yoffset']; + } + $p = array('tl'=>self::xy($xoffset-$left , $yoffset-$top ), + 'tr'=>self::xy($xoffset+$right, $yoffset-$top ), + 'bl'=>self::xy($xoffset-$left , $yoffset+$bottom), + 'br'=>self::xy($xoffset+$right, $yoffset+$bottom)); + return $p; + } + public static function points_border_drop($args) { + $xoffset = $yoffset = $xdrop = $ydrop = 0; + if (isset($args['xoffset'])) { + $xoffset = $args['xoffset']; + } + if (isset($args['yoffset'])) { + $yoffset = $args['yoffset']; + } + if (isset($args['drop'])) { + $xdrop = $ydrop = $args['drop']; + } + if (isset($args['xdrop'])) { + $xdrop = $args['xdrop']; + } + if (isset($args['ydrop'])) { + $ydrop = $args['ydrop']; + } + + $base = self::points_border($args); + if ($xdrop==$ydrop && $xdrop==0) { return $base; } + $args['xoffset'] = $xoffset+$xdrop; + $args['yoffset'] = $yoffset+$ydrop; + $drop = self::points_border($args); + + $right = ($xdrop > 0); + $bottom = ($ydrop > 0); + + /* 0|1 + * -+- + * 2|3 + */ + $q = 0; + if ($right) $q+=1; + if ($bottom) $q+=2; + + switch ($q) { + case 0: // top-left (or bottom-right) + // clockwise, start in top-left + $ret = array($drop['tl'], + $drop['tr'], + $base['tr'], + $base['br'], + $base['bl'], + $drop['bl'], + $drop['tl']); + return $ret; + case 1: // top-right (or bottom-left) + // clockwise, start in top-right + $ret = array($drop['tr'], + $drop['br'], + $base['br'], + $base['bl'], + $base['tl'], + $drop['tl'], + $drop['tr']); + return $ret; + case 2: /* TODO */ break; + case 3: // top-left (or bottom-right) + // clockwise, start in top-left + $ret = array($base['tl'], + $base['tr'], + $drop['tr'], + $drop['br'], + $drop['bl'], + $base['bl'], + $base['tl']); + return $ret; + } + } + public static function draw_border($args) { + $steps = 0; $color = '#000000'; + if (isset($args['steps'])) { $steps = $args['steps']; } + if (isset($args['color'])) { $color = $args['color']; } + return self::draw_multiline(self::points_border_drop($args), $steps, $color); + } +} |