1 files changed, 40 insertions, 0 deletions
diff --git a/vendor/markbaker/complex/classes/src/functions/theta.php b/vendor/markbaker/complex/classes/src/functions/theta.php
new file mode 100644
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--- /dev/null
+++ b/vendor/markbaker/complex/classes/src/functions/theta.php
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+<?php
+
+/**
+ *
+ * Function code for the complex theta() function
+ *
+ * @copyright  Copyright (c) 2013-2018 Mark Baker (https://github.com/MarkBaker/PHPComplex)
+ * @license    https://opensource.org/licenses/MIT    MIT
+ */
+namespace Complex;
+
+/**
+ * Returns the theta of a complex number.
+ *   This is the angle in radians from the real axis to the representation of the number in polar coordinates.
+ *
+ * @param     Complex|mixed    $complex    Complex number or a numeric value.
+ * @return    float            The theta value of the complex argument.
+ * @throws    Exception        If argument isn't a valid real or complex number.
+ */
+if (!function_exists(__NAMESPACE__ . '\\theta')) {
+    function theta($complex): float
+    {
+        $complex = Complex::validateComplexArgument($complex);
+
+        if ($complex->getReal() == 0.0) {
+            if ($complex->isReal()) {
+                return 0.0;
+            } elseif ($complex->getImaginary() < 0.0) {
+                return M_PI / -2;
+            }
+            return M_PI / 2;
+        } elseif ($complex->getReal() > 0.0) {
+            return \atan($complex->getImaginary() / $complex->getReal());
+        } elseif ($complex->getImaginary() < 0.0) {
+            return -(M_PI - \atan(\abs($complex->getImaginary()) / \abs($complex->getReal())));
+        }
+
+        return M_PI - \atan($complex->getImaginary() / \abs($complex->getReal()));
+    }
+}