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<?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);
}
}
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