org.mozilla.gecko.gfx.PointUtils.java Source code

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Here is the source code for org.mozilla.gecko.gfx.PointUtils.java

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/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Android code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2011
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Kartikaya Gupta <kgupta@mozilla.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.mozilla.gecko.gfx;

import android.graphics.Point;
import android.graphics.PointF;
import android.util.FloatMath;

import org.json.JSONObject;
import org.json.JSONException;
import org.mozilla.gecko.FloatUtils;

import java.lang.Math;

public final class PointUtils {
    public static PointF add(PointF one, PointF two) {
        return new PointF(one.x + two.x, one.y + two.y);
    }

    public static PointF subtract(PointF one, PointF two) {
        return new PointF(one.x - two.x, one.y - two.y);
    }

    public static PointF scale(PointF point, float factor) {
        return new PointF(point.x * factor, point.y * factor);
    }

    public static Point round(PointF point) {
        return new Point(Math.round(point.x), Math.round(point.y));
    }

    /* Returns a new point that is a linear interpolation between start and end points. weight conrols the weighting
     * of each of the original points (weight = 1 returns endPoint, weight = 0 returns startPoint)
     */
    public static PointF interpolate(PointF startPoint, PointF endPoint, float weight) {
        float x = FloatUtils.interpolate(startPoint.x, endPoint.x, weight);
        float y = FloatUtils.interpolate(startPoint.y, endPoint.y, weight);
        return new PointF(x, y);
    }

    /* Computes the magnitude of the given vector. */
    public static float distance(PointF point) {
        return (float) Math.sqrt(point.x * point.x + point.y * point.y);
    }

    /** Computes the scalar distance between two points. */
    public static float distance(PointF one, PointF two) {
        return PointF.length(one.x - two.x, one.y - two.y);
    }

    public static JSONObject toJSON(PointF point) throws JSONException {
        // Ensure we put ints, not longs, because Gecko message handlers call getInt().
        int x = Math.round(point.x);
        int y = Math.round(point.y);
        JSONObject json = new JSONObject();
        json.put("x", x);
        json.put("y", y);
        return json;
    }
}