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<?php |
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namespace backend\widgets\chart\flot\data; |
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/** |
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* Class Demo |
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* |
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* @package modules\main\models\backend |
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*/ |
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class Demo |
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{ |
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/** |
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* Demo Random Data |
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* |
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* @param array|null $data |
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* @param int $totalPoints |
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* @return array |
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*/ |
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public static function getRandomData($data = [], $totalPoints = 100) |
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{ |
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if (is_null($data)) { |
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$data = []; |
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} |
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if (count($data) > 0) { |
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$data = array_slice($data, 1); |
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} |
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$randomWalk = self::randomWalk($data, $totalPoints); |
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// Zip the generated y values with the x values |
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$res = []; |
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foreach ($randomWalk as $key => $items) { |
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$items[0] = $key; |
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$res[] = $items; |
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} |
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return $res; |
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} |
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/** |
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* Do a random walk |
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* |
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* @param array $data |
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* @param int $totalPoints |
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* @return array |
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*/ |
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public static function randomWalk($data = [], $totalPoints = 100) |
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{ |
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$count = count($data); |
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while ($count < $totalPoints) { |
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$prev = $count > 0 ? (int)$data[$count - 1] : $totalPoints / 2; |
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$val = $prev + self::randomFloat(0, $totalPoints); |
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if ($val < 0) { |
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$val = 0; |
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} elseif ($val > $totalPoints) { |
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$val = $totalPoints; |
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} |
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$data[] = [$count, $val]; |
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$count++; |
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} |
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return $data; |
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} |
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/** |
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* Calculating a random floating point number |
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* |
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* @param int $min |
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* @param int $max |
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* @return float|int|mixed |
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*/ |
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public static function randomFloat($min = 0, $max = 1) |
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{ |
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return $min + mt_rand() / mt_getrandmax() * ($max - $min); |
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} |
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/** |
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* Get Sin Demo Data |
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* |
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* @param float $limit |
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* @return array |
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*/ |
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public static function getSin($limit = 0.25) |
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{ |
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$data = []; |
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for ($i = 0; $i < M_PI * 2; $i += $limit) { |
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$data[] = [$i, sin($i)]; |
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} |
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return $data; |
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} |
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/** |
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* Get Cos Demo Data |
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* |
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* @param float $limit |
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* @return array |
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*/ |
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public static function getCos($limit = 0.25) |
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{ |
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$data = []; |
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for ($i = 0; $i < M_PI * 2; $i += $limit) { |
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$data[] = [$i, cos($i)]; |
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} |
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return $data; |
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} |
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/** |
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* Get Tan Demo Data |
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* |
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* @param float $limit |
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* @return array |
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*/ |
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public static function getTan($limit = 0.1) |
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{ |
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$data = []; |
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for ($i = 0; $i < M_PI * 2; $i += $limit) { |
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$data[] = [$i, tan($i)]; |
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} |
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return $data; |
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} |
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} |
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Dominus77 /
yii2-advanced-start
