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Draw full circle pie slice (100%) as a primitive 

Allows getPieSlicePath to draw a full circle pie slice (100%) by slightly adjusting endpoint to have a valid arc. Also hides a central line as there will be no more pie slices.
This commit is contained in:
Goran Rakic 2014-08-21 03:50:50 +02:00 committed by Matthias Jentsch
parent 3a85a45ef2
commit 2575634dec
1 changed files with 15 additions and 7 deletions
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22
library/Icinga/Chart/Primitive/PieSlice.php
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@ -104,17 +104,22 @@ class PieSlice extends Animatable implements Drawable
*/
private function getPieSlicePath($x, $y, $r)
{
// start at the center of the pieslice
$pathString = 'M ' . $x . ' ' . $y . ' ';
// 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));
$xEnd = $x + ($r * sin($this->endRadian));
$yEnd = $y - ($r * cos($this->endRadian));
// Draw a straight line to the upper part of the arc
$pathString .= 'L ' . Format::formatSVGNumber($xStart) . ' ' . Format::formatSVGNumber($yStart);
if($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
@ -122,7 +127,10 @@ class PieSlice extends Animatable implements Drawable
$pathString .= ' 0 ' . (($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;
}