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<?php |
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namespace Vctls\IntervalGraph; |
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use LogicException; |
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/** |
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* Holds color information for the graph as an array of CSS classes. |
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* |
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* @package Vctls\IntervalGraph |
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*/ |
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class ClassPalette implements PaletteInterface |
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{ |
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/** |
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* @var array $palette An array of percentages with corresponding color codes. |
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* |
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* In order to keep a simple array, the pairs are defined following these rules: |
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* Pairs are sorted by value in ascending order. |
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* The first pair defines the color for all lower values. |
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* The last pair defines the color for all higher values. |
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* When two pairs with the same value are consecutive, the second pair defines |
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* the color of this discrete value. |
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*/ |
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protected $palette = [ |
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[0, 'color_0'], |
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[0, 'color_0'], |
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[50, 'color_1'], |
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[100, 'color_2'], |
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[100, 'color_3'], |
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[100, 'color_4'], |
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]; |
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protected $bgColor = '#e1e0eb'; |
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/** |
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* Set the color palette for percent ranges. |
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* |
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* Ranges should be simple arrays, containing only the |
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* upper bound and the corresponding color value, like this: |
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* [ 50, '.color_3' ] |
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* |
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* For discrete values, simply insert the same value twice. |
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* |
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* Make sure values are in the correct order. |
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* |
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* @param array $palette |
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* @return ClassPalette |
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*/ |
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public function setColors(array $palette): ClassPalette |
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{ |
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$this->palette = $palette; |
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return $this; |
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} |
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/** |
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* @param string $color A color reference or hex code. |
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* @return $this |
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*/ |
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public function setBGColor(string $color): self |
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{ |
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$this->bgColor = $color; |
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return $this; |
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} |
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/** |
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* Get the hexadecimal color code for the given percentage. |
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* |
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* @param int|null $percent |
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* @return string |
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*/ |
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public function getColor(int $percent = null): string |
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{ |
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$pal = $this->palette; |
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if ($percent === null) { |
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return $this->bgColor ?? ''; |
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} |
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foreach ($pal as $i => $iValue) { |
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if (($i === 0 && $percent < $iValue[0]) |
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|| ($i > 0 && $iValue[0] === $pal[$i - 1][0] && $percent === $iValue[0]) |
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|| ($i > 0 && $iValue[0] !== $pal[$i - 1][0] && $percent < $iValue[0]) |
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|| ($i === (count($pal) - 1) && $percent > $iValue[0]) |
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) { |
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return $iValue[1]; |
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} |
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} |
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throw new LogicException("The percentage $percent did not match any range in the color palette."); |
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} |
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} |
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vctls /
php-interval-graph
