/**
* Draw the label handler and the text for this pie slice
*
* @param RenderContext $ctx The rendering context to use for coordinate translation
* @param int $r The radius of the pie in absolute coordinates
*
* @return DOMElement The group DOMElement containing the handle and label
*/
private function drawDescriptionLabel(RenderContext $ctx, $r)
{
$group = $ctx->getDocument()->createElement('g');
$rOuter = ($ctx->xToAbsolute($this->outerCaptionBound) + $ctx->yToAbsolute($this->outerCaptionBound)) / 2;
$addOffset = $rOuter - $r;
if ($addOffset < 0) {
$addOffset = 0;
}
list($x, $y) = $ctx->toAbsolute($this->x, $this->y);
$midRadius = $this->startRadian + ($this->endRadian - $this->startRadian) / 2;
list($offsetX, $offsetY) = $ctx->toAbsolute($this->captionOffset, $this->captionOffset);
$midX = $x + intval(($offsetX + $r) / 2 * sin($midRadius));
$midY = $y - intval(($offsetY + $r) / 2 * cos($midRadius));
// Draw the handle
$path = new Path(array($midX, $midY));
$midX += ($addOffset + $r / 1.8) * ($midRadius > M_PI ? -1 : 1);
$path->append(array($midX, $midY))->toAbsolute();
$midX += intval($r / 2 * sin(M_PI / 9)) * ($midRadius > M_PI ? -1 : 1);
$midY -= intval($r / 2 * cos(M_PI / 3)) * ($midRadius < M_PI * 1.4 && $midRadius > M_PI / 3 ? -1 : 1);
if ($ctx->ytoRelative($midY) > 100) {
$midY = $ctx->yToAbsolute(100);
} elseif ($ctx->ytoRelative($midY) < 0) {
$midY = $ctx->yToAbsolute($ctx->ytoRelative(100 + $midY));
}
$path->append(array($midX, $midY));
$rel = $ctx->toRelative($midX, $midY);
// Draw the text box
$text = new Text($rel[0] + 1.5, $rel[1], $this->caption);
$text->setFontSize('2.5em');
$text->setAlignment($midRadius > M_PI ? Text::ALIGN_END : Text::ALIGN_START);
$group->appendChild($path->toSvg($ctx));
$group->appendChild($text->toSvg($ctx));
return $group;
}
