1 files changed, 94 insertions, 0 deletions
diff --git a/src/org/cyanogenmod/audiofx/widget/Complex.java b/src/org/cyanogenmod/audiofx/widget/Complex.java
new file mode 100644
index 0000000..b4691a3
--- /dev/null
+++ b/src/org/cyanogenmod/audiofx/widget/Complex.java
@@ -0,0 +1,94 @@
+package org.cyanogenmod.audiofx.widget;
+
+/**
+ * Java support for complex numbers.
+ *
+ * @author alankila
+ */
+class Complex {
+    private final double mReal, mIm;
+
+    protected Complex(double real, double im) {
+        mReal = real;
+        mIm = im;
+    }
+
+    /**
+     * Length of complex number
+     *
+     * @return length
+     */
+    protected double rho() {
+        return Math.sqrt(mReal * mReal + mIm * mIm);
+    }
+
+    /**
+     * Argument of complex number
+     *
+     * @return angle in radians
+     */
+    protected double theta() {
+        return Math.atan2(mIm, mReal);
+    }
+
+    /**
+     * Complex conjugate
+     *
+     * @return conjugate
+     */
+    protected Complex con() {
+        return new Complex(mReal, -mIm);
+    }
+
+    /**
+     * Complex addition
+     *
+     * @param other
+     * @return sum
+     */
+    protected Complex add(Complex other) {
+        return new Complex(mReal + other.mReal, mIm + other.mIm);
+    }
+
+    /**
+     * Complex multipply
+     *
+     * @param other
+     * @return multiplication result
+     */
+    protected Complex mul(Complex other) {
+        return new Complex(mReal * other.mReal - mIm * other.mIm,
+                mReal * other.mIm + mIm * other.mReal);
+    }
+
+    /**
+     * Complex multiply with real value
+     *
+     * @param a
+     * @return multiplication result
+     */
+    protected Complex mul(double a) {
+        return new Complex(mReal * a, mIm * a);
+    }
+
+    /**
+     * Complex division
+     *
+     * @param other
+     * @return division result
+     */
+    protected Complex div(Complex other) {
+        double lengthSquared = other.mReal * other.mReal + other.mIm * other.mIm;
+        return mul(other.con()).div(lengthSquared);
+    }
+
+    /**
+     * Complex division with real value
+     *
+     * @param a
+     * @return division result
+     */
+    protected Complex div(double a) {
+        return new Complex(mReal / a, mIm / a);
+    }
+}