1 files changed, 95 insertions, 0 deletions
diff --git a/java/com/android/incallui/answer/impl/classifier/Point.java b/java/com/android/incallui/answer/impl/classifier/Point.java
new file mode 100644
index 000000000..5ea48b4ce
--- /dev/null
+++ b/java/com/android/incallui/answer/impl/classifier/Point.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+package com.android.incallui.answer.impl.classifier;
+
+class Point {
+  public float x;
+  public float y;
+  public long timeOffsetNano;
+
+  public Point(float x, float y) {
+    this.x = x;
+    this.y = y;
+    this.timeOffsetNano = 0;
+  }
+
+  public Point(float x, float y, long timeOffsetNano) {
+    this.x = x;
+    this.y = y;
+    this.timeOffsetNano = timeOffsetNano;
+  }
+
+  @Override
+  public boolean equals(Object other) {
+    if (!(other instanceof Point)) {
+      return false;
+    }
+    Point otherPoint = ((Point) other);
+    return x == otherPoint.x && y == otherPoint.y;
+  }
+
+  @Override
+  public int hashCode() {
+    int result = (x != +0.0f ? Float.floatToIntBits(x) : 0);
+    result = 31 * result + (y != +0.0f ? Float.floatToIntBits(y) : 0);
+    return result;
+  }
+
+  public float dist(Point a) {
+    return (float) Math.hypot(a.x - x, a.y - y);
+  }
+
+  /**
+   * Calculates the cross product of vec(this, a) and vec(this, b) where vec(x,y) is the vector from
+   * point x to point y
+   */
+  public float crossProduct(Point a, Point b) {
+    return (a.x - x) * (b.y - y) - (a.y - y) * (b.x - x);
+  }
+
+  /**
+   * Calculates the dot product of vec(this, a) and vec(this, b) where vec(x,y) is the vector from
+   * point x to point y
+   */
+  public float dotProduct(Point a, Point b) {
+    return (a.x - x) * (b.x - x) + (a.y - y) * (b.y - y);
+  }
+
+  /**
+   * Calculates the angle in radians created by points (a, this, b). If any two of these points are
+   * the same, the method will return 0.0f
+   *
+   * @return the angle in radians
+   */
+  public float getAngle(Point a, Point b) {
+    float dist1 = dist(a);
+    float dist2 = dist(b);
+
+    if (dist1 == 0.0f || dist2 == 0.0f) {
+      return 0.0f;
+    }
+
+    float crossProduct = crossProduct(a, b);
+    float dotProduct = dotProduct(a, b);
+    float cos = Math.min(1.0f, Math.max(-1.0f, dotProduct / dist1 / dist2));
+    float angle = (float) Math.acos(cos);
+    if (crossProduct < 0.0) {
+      angle = 2.0f * (float) Math.PI - angle;
+    }
+    return angle;
+  }
+}