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+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Chart\Primitive;
+
+use DOMElement;
+use Icinga\Chart\Render\RenderContext;
+use Icinga\Chart\Format;
+
+/**
+ * Component for drawing a pie slice
+ */
+class PieSlice extends Animatable implements Drawable
+{
+ /**
+ * The radius of this pieslice relative to the canvas
+ *
+ * @var int
+ */
+ private $radius = 50;
+
+ /**
+ * The start radian of the pie slice
+ *
+ * @var float
+ */
+ private $startRadian = 0;
+
+ /**
+ * The end radian of the pie slice
+ *
+ * @var float
+ */
+ private $endRadian = 0;
+
+ /**
+ * The x position of the pie slice's center
+ *
+ * @var int
+ */
+ private $x;
+
+ /**
+ * The y position of the pie slice's center
+ *
+ * @var int
+ */
+ private $y;
+
+ /**
+ * The caption of the pie slice, empty string means no caption
+ *
+ * @var string
+ */
+ private $caption = "";
+
+ /**
+ * The offset of the caption, shifting the indicator from the center of the pie slice
+ *
+ * This is required for nested pie slices.
+ *
+ * @var int
+ */
+ private $captionOffset = 0;
+
+ /**
+ * The minimum radius the label must respect
+ *
+ * @var int
+ */
+ private $outerCaptionBound = 0;
+
+ /**
+ * An optional group element to add labels to when rendering
+ *
+ * @var DOMElement
+ */
+ private $labelGroup;
+
+ /**
+ * Create a pie slice
+ *
+ * @param int $radius The radius of the slice
+ * @param int $percent The percentage the slice represents
+ * @param int $percentStart The percentage where this slice starts
+ */
+ public function __construct($radius, $percent, $percentStart = 0)
+ {
+ $this->x = $this->y = $this->radius = $radius;
+
+ $this->startRadian = M_PI * $percentStart/50;
+ $this->endRadian = M_PI * ($percent + $percentStart)/50;
+ }
+
+ /**
+ * Create the path for the pie slice
+ *
+ * @param int $x The x position of the pie slice
+ * @param int $y The y position of the pie slice
+ * @param int $r The absolute radius of the pie slice
+ *
+ * @return string A SVG path string
+ */
+ private function getPieSlicePath($x, $y, $r)
+ {
+ // The coordinate system is mirrored on the Y axis, so we have to flip cos and sin
+ $xStart = $x + ($r * sin($this->startRadian));
+ $yStart = $y - ($r * cos($this->startRadian));
+
+ if ($this->endRadian - $this->startRadian == 2*M_PI) {
+ // To draw a full circle, adjust arc endpoint by a small (unvisible) value
+ $this->endRadian -= 0.001;
+ $pathString = 'M ' . Format::formatSVGNumber($xStart) . ' ' . Format::formatSVGNumber($yStart);
+ } else {
+ // Start at the center of the pieslice
+ $pathString = 'M ' . $x . ' ' . $y;
+ // Draw a straight line to the upper part of the arc
+ $pathString .= ' L ' . Format::formatSVGNumber($xStart) . ' ' . Format::formatSVGNumber($yStart);
+ }
+
+ // Instead of directly connecting the upper part of the arc (leaving a triangle), draw a bow with the radius
+ $pathString .= ' A ' . Format::formatSVGNumber($r) . ' ' . Format::formatSVGNumber($r);
+ // These are the flags for the bow, see the SVG path documentation for details
+ // http://www.w3.org/TR/SVG/paths.html#PathDataEllipticalArcCommands
+ $pathString .= ' 0 ' . (($this->endRadian - $this->startRadian > M_PI) ? '1' : '0 ') . ' 1';
+
+ // xEnd and yEnd are the lower point of the arc
+ $xEnd = $x + ($r * sin($this->endRadian));
+ $yEnd = $y - ($r * cos($this->endRadian));
+ $pathString .= ' ' . Format::formatSVGNumber($xEnd) . ' ' . Format::formatSVGNumber($yEnd);
+
+ return $pathString;
+ }
+
+ /**
+ * 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 + $r/3) * ($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('5em');
+ $text->setAlignment(($midRadius > M_PI ? Text::ALIGN_END : Text::ALIGN_START));
+
+ $group->appendChild($path->toSvg($ctx));
+ $group->appendChild($text->toSvg($ctx));
+
+ return $group;
+ }
+
+ /**
+ * Set the x position of the pie slice
+ *
+ * @param int $x The new x position
+ *
+ * @return $this Fluid interface
+ */
+ public function setX($x)
+ {
+ $this->x = $x;
+ return $this;
+ }
+
+ /**
+ * Set the y position of the pie slice
+ *
+ * @param int $y The new y position
+ *
+ * @return $this Fluid interface
+ */
+ public function setY($y)
+ {
+ $this->y = $y;
+ return $this;
+ }
+
+ /**
+ * Set a root element to be used for drawing labels
+ *
+ * @param DOMElement $group The label group
+ *
+ * @return $this Fluid interface
+ */
+ public function setLabelGroup(DOMElement $group)
+ {
+ $this->labelGroup = $group;
+ return $this;
+ }
+
+ /**
+ * Set the caption for this label
+ *
+ * @param string $caption The caption for this element
+ *
+ * @return $this Fluid interface
+ */
+ public function setCaption($caption)
+ {
+ $this->caption = $caption;
+ return $this;
+ }
+
+ /**
+ * Set the internal offset of the caption handle
+ *
+ * @param int $offset The offset for the caption handle
+ *
+ * @return $this Fluid interface
+ */
+ public function setCaptionOffset($offset)
+ {
+ $this->captionOffset = $offset;
+ return $this;
+ }
+
+ /**
+ * Set the minimum radius to be used for drawing labels
+ *
+ * @param int $bound The offset for the caption text
+ *
+ * @return $this Fluid interface
+ */
+ public function setOuterCaptionBound($bound)
+ {
+ $this->outerCaptionBound = $bound;
+ return $this;
+ }
+
+ /**
+ * Create the SVG representation from this Drawable
+ *
+ * @param RenderContext $ctx The context to use for rendering
+ *
+ * @return DOMElement The SVG Element
+ */
+ public function toSvg(RenderContext $ctx)
+ {
+ $doc = $ctx->getDocument();
+ $group = $doc->createElement('g');
+ $r = ($ctx->xToAbsolute($this->radius) + $ctx->yToAbsolute($this->radius)) / 2;
+ list($x, $y) = $ctx->toAbsolute($this->x, $this->y);
+
+ $slicePath = $doc->createElement('path');
+
+ $slicePath->setAttribute('d', $this->getPieSlicePath($x, $y, $r));
+ $slicePath->setAttribute('style', $this->getStyle());
+ $slicePath->setAttribute('data-icinga-graph-type', 'pieslice');
+
+ $this->applyAttributes($slicePath);
+ $group->appendChild($slicePath);
+ if ($this->caption != "") {
+ $lblGroup = ($this->labelGroup ? $this->labelGroup : $group);
+ $lblGroup->appendChild($this->drawDescriptionLabel($ctx, $r));
+ }
+ return $group;
+ }
+}
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