gecko/mobile/android/base/gfx/PointUtils.java

97 lines
3.7 KiB
Java

/* -*- 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;
}
}