VectorF.java

/*
 * Copyright (c) 2012 Jason Polites Licensed under the Apache License, Version
 * 2.0 (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.apache.org/licenses/LICENSE-2.0 Unless required by applicable law
 * or agreed to in writing, software distributed under the License is
 * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */
package com.tweetlanes.android.core.widget.gestureimageview;

import android.graphics.PointF;
import android.util.FloatMath;
import android.view.MotionEvent;

class VectorF {

    private float angle;
    public float length;

    private final PointF start = new PointF();
    public final PointF end = new PointF();

    public void calculateEndPoint() {
        end.x = FloatMath.cos(angle) * length + start.x;
        end.y = FloatMath.sin(angle) * length + start.y;
    }

    public void setStart(PointF p) {
        this.start.x = p.x;
        this.start.y = p.y;
    }

    public void setEnd(PointF p) {
        this.end.x = p.x;
        this.end.y = p.y;
    }

    public void set(MotionEvent event) {
        this.start.x = event.getX(0);
        this.start.y = event.getY(0);
        this.end.x = event.getX(1);
        this.end.y = event.getY(1);
    }

    public float calculateLength() {
        length = MathUtils.distance(start, end);
        return length;
    }

    public float calculateAngle() {
        angle = MathUtils.angle(start, end);
        return angle;
    }

}