dot Product between three Point - Android Graphics

Android examples for Graphics:Path Point

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Description

dot Product between three Point

Demo Code

/*/*  w w w .  java2  s  . co  m*/
 BlueFlyVario flight instrument - http://www.alistairdickie.com/blueflyvario/
 Copyright (C) 2011-2012 Alistair Dickie

 BlueFlyVario is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 BlueFlyVario is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with BlueFlyVario.  If not, see <http://www.gnu.org/licenses/>.
 */
import android.graphics.RectF;

public class Main{
    public static double dotProduct(Point2d pointA, Point2d pointB,
            Point2d pointC) {
        Point2d AB = new Point2d();
        Point2d BC = new Point2d();
        AB.x = pointB.x - pointA.x;
        AB.y = pointB.y - pointA.y;
        BC.x = pointC.x - pointB.x;
        BC.y = pointC.y - pointB.y;
        return AB.x * BC.x + AB.y * BC.y;

    }
}

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