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| -rw-r--r-- | library/Icinga/Chart/Render/RenderContext.php | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/library/Icinga/Chart/Render/RenderContext.php b/library/Icinga/Chart/Render/RenderContext.php new file mode 100644 index 0000000..457fbf3 --- /dev/null +++ b/library/Icinga/Chart/Render/RenderContext.php @@ -0,0 +1,225 @@ +<?php +/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */ + + +namespace Icinga\Chart\Render; + +use DOMDocument; + +/** + * Context for rendering, handles ratio based coordinate calculations. + * + * The most important functions when rendering are the toAbsolute and roRelative + * values, taking world coordinates and translating them into local coordinates. + */ +class RenderContext +{ + + /** + * The base size of the viewport, i.e. how many units are available on a 1:1 ratio + * + * @var array + */ + private $viewBoxSize = array(1000, 1000); + + + /** + * The DOMDocument for modifying the elements + * + * @var DOMDocument + */ + private $document; + + /** + * If true no ratio correction will be made + * + * @var bool + */ + private $respectRatio = false; + + /** + * The ratio on the x side. A x ration of 2 means that the width of the SVG is divided in 2000 + * units (see $viewBox) + * + * @var int + */ + private $xratio = 1; + + /** + * The ratio on the y side. A y ration of 2 means that the height of the SVG is divided in 2000 + * units (see $viewBox) + * + * @var int + */ + private $yratio = 1; + + /** + * Creates a new context for the given DOM Document + * + * @param DOMDocument $document The DOM document represented by this context + * @param int $width The width (may be approximate) of the document + * (only required for ratio calculation) + * @param int $height The height (may be approximate) of the document + * (only required for ratio calculation) + */ + public function __construct(DOMDocument $document, $width, $height) + { + $this->document = $document; + if ($width > $height) { + $this->xratio = $width / $height; + } elseif ($height > $width) { + $this->yratio = $height / $width; + } + } + + /** + * Return the document represented by this Rendering context + * + * @return DOMDocument The DOMDocument for creating files + */ + public function getDocument() + { + return $this->document; + } + + /** + * Let successive toAbsolute operations ignore ratio correction + * + * This can be called to avoid distortion on certain elements like rectangles. + */ + public function keepRatio() + { + $this->respectRatio = true; + } + + /** + * Let successive toAbsolute operations perform ratio correction + * + * This will cause distortion on certain elements like rectangles. + */ + public function ignoreRatio() + { + $this->respectRatio = false; + } + + /** + * Return how many unit s are available in the Y axis + * + * @return int The number of units available on the y axis + */ + public function getNrOfUnitsY() + { + return intval($this->viewBoxSize[1] * $this->yratio); + } + + /** + * Return how many unit s are available in the X axis + * + * @return int The number of units available on the x axis + */ + public function getNrOfUnitsX() + { + return intval($this->viewBoxSize[0] * $this->xratio); + } + + /** + * Transforms the x,y coordinate from relative coordinates to absolute world coordinates + * + * (50, 50) would be a point in the middle of the document and map to 500, 1000 on a + * 1000 x 1000 viewbox with a 1:2 ratio. + * + * @param int $x The relative x coordinate + * @param int $y The relative y coordinate + * + * @return array An x,y tuple containing absolute coordinates + * @see RenderContext::toRelative + */ + public function toAbsolute($x, $y) + { + return array($this->xToAbsolute($x), $this->yToAbsolute($y)); + } + + /** + * Transforms the x,y coordinate from absolute coordinates to relative world coordinates + * + * This is the inverse function of toAbsolute + * + * @param int $x The absolute x coordinate + * @param int $y The absolute y coordinate + * + * @return array An x,y tupel containing absolute coordinates + * @see RenderContext::toAbsolute + */ + public function toRelative($x, $y) + { + return array($this->xToRelative($x), $this->yToRelative($y)); + } + + /** + * Calculates the scale transformation required to apply the padding on an Canvas + * + * @param array $padding A 4 element array containing top, right, bottom and left padding + * + * @return array An array containing the x and y scale + */ + public function paddingToScaleFactor(array $padding) + { + list($horizontalPadding, $verticalPadding) = $this->toAbsolute( + $padding[LayoutBox::PADDING_RIGHT] + $padding[LayoutBox::PADDING_LEFT], + $padding[LayoutBox::PADDING_TOP] + $padding[LayoutBox::PADDING_BOTTOM] + ); + + return array( + ($this->getNrOfUnitsX() - $horizontalPadding) / $this->getNrOfUnitsX(), + ($this->getNrOfUnitsY() - $verticalPadding) / $this->getNrOfUnitsY() + ); + } + + /** + * Transform a relative x coordinate to an absolute one + * + * @param int $x A relative x coordinate + * + * @return int An absolute x coordinate + **/ + public function xToAbsolute($x) + { + return $this->getNrOfUnitsX() / 100 * $x / ($this->respectRatio ? $this->xratio : 1); + } + + /** + * Transform a relative y coordinate to an absolute one + * + * @param int $y A relative y coordinate + * + * @return int An absolute y coordinate + */ + public function yToAbsolute($y) + { + return $this->getNrOfUnitsY() / 100 * $y / ($this->respectRatio ? $this->yratio : 1); + } + + /** + * Transform a absolute x coordinate to an relative one + * + * @param int $x An absolute x coordinate + * + * @return int A relative x coordinate + */ + public function xToRelative($x) + { + return $x / $this->getNrOfUnitsX() * 100 * ($this->respectRatio ? $this->xratio : 1); + } + + /** + * Transform a absolute y coordinate to an relative one + * + * @param int $y An absolute x coordinate + * + * @return int A relative x coordinate + */ + public function yToRelative($y) + { + return $y / $this->getNrOfUnitsY() * 100 * ($this->respectRatio ? $this->yratio : 1); + } +} |