/**
* Strips units from before and after label
*/
protected function StripLabel($label)
{
$before = $this->before_label;
$after = $this->after_label;
$enc = $this->encoding;
$llen = SVGGraphStrlen($label, $enc);
$blen = SVGGraphStrlen($before, $enc);
$alen = SVGGraphStrlen($after, $enc);
if ($alen > 0 && SVGGraphSubstr($label, $llen - $alen, $alen, $enc) == $after) {
$label = SVGGraphSubstr($label, 0, $llen - $alen, $enc);
}
if ($blen > 0 && SVGGraphSubstr($label, 0, $blen, $enc) == $before) {
$label = SVGGraphSubstr($label, $blen, NULL, $enc);
}
return $label;
}
/**
* Creates a single marker element and its link version
*/
private function CreateMarker($type, $size, $fill, $stroke_width, $stroke_colour)
{
$m_key = "{$type}:{$size}:{$fill}:{$stroke_width}:{$stroke_colour}";
if (isset($this->marker_types[$m_key])) {
return $this->marker_types[$m_key];
}
$id = $this->NewID();
$marker = array('id' => $id, 'cursor' => 'crosshair', 'fill' => $fill);
if (!empty($stroke_colour) && $stroke_colour != 'none') {
$marker['stroke'] = $stroke_colour;
if (!empty($stroke_width)) {
$marker['stroke-width'] = $stroke_width;
}
}
// check for image marker
if (strncmp($type, 'image:', 6) == 0) {
$image_path = SVGGraphSubstr($type, 6, NULL, $this->encoding);
$type = 'image';
}
$a = $size;
// will be repeated a lot, and 'a' is smaller
$element = 'path';
switch ($type) {
case 'triangle':
$o = $a * tan(M_PI / 6);
$h = $a / cos(M_PI / 6);
$marker['d'] = "M{$a},{$o} L0,-{$h} L-{$a},{$o} z";
break;
case 'diamond':
$marker['d'] = "M0 -{$a}L{$a} 0 0 {$a} -{$a} 0z";
break;
case 'square':
$element = 'rect';
$marker['x'] = $marker['y'] = -$a;
$marker['width'] = $marker['height'] = $a * 2;
break;
case 'x':
$marker['transform'] = 'rotate(45)';
// no break - 'x' is a cross rotated by 45 degrees
// no break - 'x' is a cross rotated by 45 degrees
case 'cross':
$t = $a / 4;
$marker['d'] = "M-{$a},-{$t} L-{$a},{$t} -{$t},{$t} -{$t},{$a} " . "{$t},{$a} {$t},{$t} {$a},{$t} " . "{$a},-{$t} {$t},-{$t} {$t},-{$a} " . "-{$t},-{$a} -{$t},-{$t} z";
break;
case 'octagon':
$t = $a * sin(M_PI / 8);
$marker['d'] = "M{$t} -{$a}L{$a} -{$t} {$a} {$t} {$t} {$a} -{$t} {$a} " . "-{$a} {$t} -{$a} -{$t} -{$t} -{$a}z";
break;
case 'star':
$t = $a * 0.382;
$x1 = $t * sin(M_PI * 0.8);
$y1 = $t * cos(M_PI * 0.8);
$x2 = $a * sin(M_PI * 0.6);
$y2 = $a * cos(M_PI * 0.6);
$x3 = $t * sin(M_PI * 0.4);
$y3 = $t * cos(M_PI * 0.4);
$x4 = $a * sin(M_PI * 0.2);
$y4 = $a * cos(M_PI * 0.2);
$marker['d'] = "M0 -{$a}L{$x1} {$y1} {$x2} {$y2} {$x3} {$y3} {$x4} {$y4} 0 {$t} " . "-{$x4} {$y4} -{$x3} {$y3} -{$x2} {$y2} -{$x1} {$y1} z";
break;
case 'threestar':
$t = $a / 4;
$t1 = $t * cos(M_PI / 6);
$t2 = $t * sin(M_PI / 6);
$a1 = $a * cos(M_PI / 6);
$a2 = $a * sin(M_PI / 6);
$marker['d'] = "M0 -{$a}L{$t1} -{$t2} {$a1} {$a2} 0 {$t} -{$a1} {$a2} -{$t1} -{$t2}z";
break;
case 'fourstar':
$t = $a / 4;
$marker['d'] = "M0 -{$a}L{$t} -{$t} {$a} 0 {$t} {$t} " . "0 {$a} -{$t} {$t} -{$a} 0 -{$t} -{$t}z";
break;
case 'eightstar':
$t = $a * sin(M_PI / 8);
$marker['d'] = "M0 -{$t}L{$t} -{$a} {$t} -{$t} {$a} -{$t} {$t} 0 " . "{$a} {$t} {$t} {$t} {$t} {$a} 0 {$t} -{$t} {$a} -{$t} {$t} -{$a} {$t} -{$t} 0 " . "-{$a} -{$t} -{$t} -{$t} -{$t} -{$a}z";
break;
case 'asterisk':
$t = $a / 3;
$x1 = $a * sin(M_PI * 0.9);
$y1 = $a * cos(M_PI * 0.9);
$x2 = $t * sin(M_PI * 0.8);
$y2 = $t * cos(M_PI * 0.8);
$x3 = $a * sin(M_PI * 0.7);
$y3 = $a * cos(M_PI * 0.7);
$x4 = $a * sin(M_PI * 0.5);
$y4 = $a * cos(M_PI * 0.5);
$x5 = $t * sin(M_PI * 0.4);
$y5 = $t * cos(M_PI * 0.4);
$x6 = $a * sin(M_PI * 0.3);
$y6 = $a * cos(M_PI * 0.3);
$x7 = $a * sin(M_PI * 0.1);
$y7 = $a * cos(M_PI * 0.1);
$marker['d'] = "M{$x1} {$y1}L{$x2} {$y2} {$x3} {$y3} {$x4} {$y4} {$x5} {$y5} " . "{$x6} {$y6} {$x7} {$y7} 0 {$t} -{$x7} {$y7} -{$x6} {$y6} -{$x5} {$y5} -{$x4} {$y4} " . "-{$x3} {$y3} -{$x2} {$y2} -{$x1} {$y1}z";
break;
case 'pentagon':
$x1 = $a * sin(M_PI * 0.4);
$y1 = $a * cos(M_PI * 0.4);
$x2 = $a * sin(M_PI * 0.2);
$y2 = $a * cos(M_PI * 0.2);
$marker['d'] = "M0 -{$a}L{$x1} -{$y1} {$x2} {$y2} -{$x2} {$y2} -{$x1} -{$y1}z";
break;
case 'hexagon':
$x = $a * sin(M_PI / 3);
$y = $a * cos(M_PI / 3);
$marker['d'] = "M0 -{$a}L{$x} -{$y} {$x} {$y} 0 {$a} -{$x} {$y} -{$x} -{$y}z";
break;
case 'image':
$element = 'image';
$marker['xlink:href'] = $image_path;
$marker['x'] = $marker['y'] = -$size;
$marker['width'] = $size * 2;
$marker['height'] = $size * 2;
break;
case 'circle':
default:
$element = 'circle';
$marker['r'] = $size;
}
$this->marker_elements[$marker['id']] = $this->Element('symbol', NULL, NULL, $this->Element($element, $marker, NULL));
// add link version
unset($marker['cursor']);
$this->marker_link_ids[$marker['id']] = $this->NewID();
$marker['id'] = $this->marker_link_ids[$marker['id']];
$this->marker_elements[$marker['id']] = $this->Element('symbol', NULL, NULL, $this->Element($element, $marker, NULL));
// save this marker style for reuse
$this->marker_types[$m_key] = $id;
return $id;
}