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 public final class PointUtils {
  15     public static PointF add(PointF one, PointF two) {
  16         return new PointF(one.x + two.x, one.y + two.y);
  17     }
  18
  19     public static PointF subtract(PointF one, PointF two) {
  20         return new PointF(one.x - two.x, one.y - two.y);
  21     }
  22
  23     public static PointF scale(PointF point, float factor) {
  24         return new PointF(point.x * factor, point.y * factor);
  25     }
  26
  27     public static Point round(PointF point) {
  28         return new Point(Math.round(point.x), Math.round(point.y));
  29     }
  30
  31    /* Computes the magnitude of the given vector. */
  32    public static float distance(PointF point) {
  33         return (float)Math.sqrt(point.x * point.x + point.y * point.y);
  34    }
  35
  36     /** Computes the scalar distance between two points. */
  37     public static float distance(PointF one, PointF two) {
  38         return PointF.length(one.x - two.x, one.y - two.y);
  39     }
  40
  41     public static JSONObject toJSON(PointF point) throws JSONException {
  42         // Ensure we put ints, not longs, because Gecko message handlers call getInt().
  43         int x = Math.round(point.x);
  44         int y = Math.round(point.y);
  45         JSONObject json = new JSONObject();
  46         json.put("x", x);
  47         json.put("y", y);
  48         return json;
  49     }
  50 }
  51