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      1 /*
      2  * Copyright (C) 2007 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package android.graphics;
     18 
     19 import android.os.Parcel;
     20 import android.os.Parcelable;
     21 
     22 
     23 /**
     24  * PointF holds two float coordinates
     25  */
     26 public class PointF implements Parcelable {
     27     public float x;
     28     public float y;
     29 
     30     public PointF() {}
     31 
     32     public PointF(float x, float y) {
     33         this.x = x;
     34         this.y = y;
     35     }
     36 
     37     public PointF(Point p) {
     38         this.x = p.x;
     39         this.y = p.y;
     40     }
     41 
     42     /**
     43      * Set the point's x and y coordinates
     44      */
     45     public final void set(float x, float y) {
     46         this.x = x;
     47         this.y = y;
     48     }
     49 
     50     /**
     51      * Set the point's x and y coordinates to the coordinates of p
     52      */
     53     public final void set(PointF p) {
     54         this.x = p.x;
     55         this.y = p.y;
     56     }
     57 
     58     public final void negate() {
     59         x = -x;
     60         y = -y;
     61     }
     62 
     63     public final void offset(float dx, float dy) {
     64         x += dx;
     65         y += dy;
     66     }
     67 
     68     /**
     69      * Returns true if the point's coordinates equal (x,y)
     70      */
     71     public final boolean equals(float x, float y) {
     72         return this.x == x && this.y == y;
     73     }
     74 
     75     @Override
     76     public boolean equals(Object o) {
     77         if (this == o) return true;
     78         if (o == null || getClass() != o.getClass()) return false;
     79 
     80         PointF pointF = (PointF) o;
     81 
     82         if (Float.compare(pointF.x, x) != 0) return false;
     83         if (Float.compare(pointF.y, y) != 0) return false;
     84 
     85         return true;
     86     }
     87 
     88     @Override
     89     public int hashCode() {
     90         int result = (x != +0.0f ? Float.floatToIntBits(x) : 0);
     91         result = 31 * result + (y != +0.0f ? Float.floatToIntBits(y) : 0);
     92         return result;
     93     }
     94 
     95     @Override
     96     public String toString() {
     97         return "PointF(" + x + ", " + y + ")";
     98     }
     99 
    100     /**
    101      * Return the euclidian distance from (0,0) to the point
    102      */
    103     public final float length() {
    104         return length(x, y);
    105     }
    106 
    107     /**
    108      * Returns the euclidian distance from (0,0) to (x,y)
    109      */
    110     public static float length(float x, float y) {
    111         return (float) Math.hypot(x, y);
    112     }
    113 
    114     /**
    115      * Parcelable interface methods
    116      */
    117     @Override
    118     public int describeContents() {
    119         return 0;
    120     }
    121 
    122     /**
    123      * Write this point to the specified parcel. To restore a point from
    124      * a parcel, use readFromParcel()
    125      * @param out The parcel to write the point's coordinates into
    126      */
    127     @Override
    128     public void writeToParcel(Parcel out, int flags) {
    129         out.writeFloat(x);
    130         out.writeFloat(y);
    131     }
    132 
    133     public static final Parcelable.Creator<PointF> CREATOR = new Parcelable.Creator<PointF>() {
    134         /**
    135          * Return a new point from the data in the specified parcel.
    136          */
    137         public PointF createFromParcel(Parcel in) {
    138             PointF r = new PointF();
    139             r.readFromParcel(in);
    140             return r;
    141         }
    142 
    143         /**
    144          * Return an array of rectangles of the specified size.
    145          */
    146         public PointF[] newArray(int size) {
    147             return new PointF[size];
    148         }
    149     };
    150 
    151     /**
    152      * Set the point's coordinates from the data stored in the specified
    153      * parcel. To write a point to a parcel, call writeToParcel().
    154      *
    155      * @param in The parcel to read the point's coordinates from
    156      */
    157     public void readFromParcel(Parcel in) {
    158         x = in.readFloat();
    159         y = in.readFloat();
    160     }
    161 }
    162