android/source/src/java/org/mozilla/gecko/gfx/PointUtils.java

   1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 package org.mozilla.gecko.gfx;
   7
   8 import android.graphics.Point;
   9 import android.graphics.PointF;
  10
  11 import org.json.JSONException;
  12 import org.json.JSONObject;
  13
  14 import java.lang.StrictMath;
  15
  16 public final class PointUtils {
  17     public static PointF add(PointF one, PointF two) {
  18         return new PointF(one.x + two.x, one.y + two.y);
  19     }
  20
  21     public static PointF subtract(PointF one, PointF two) {
  22         return new PointF(one.x - two.x, one.y - two.y);
  23     }
  24
  25     public static PointF scale(PointF point, float factor) {
  26         return new PointF(point.x * factor, point.y * factor);
  27     }
  28
  29     public static Point round(PointF point) {
  30         return new Point(Math.round(point.x), Math.round(point.y));
  31     }
  32
  33    /* Computes the magnitude of the given vector. */
  34    public static float distance(PointF point) {
  35         return (float)StrictMath.hypot(point.x, point.y);
  36    }
  37
  38     /** Computes the scalar distance between two points. */
  39     public static float distance(PointF one, PointF two) {
  40         return PointF.length(one.x - two.x, one.y - two.y);
  41     }
  42
  43     public static JSONObject toJSON(PointF point) throws JSONException {
  44         // Ensure we put ints, not longs, because Gecko message handlers call getInt().
  45         int x = Math.round(point.x);
  46         int y = Math.round(point.y);
  47         JSONObject json = new JSONObject();
  48         json.put("x", x);
  49         json.put("y", y);
  50         return json;
  51     }
  52 }
  53