android/graphics/Point.java

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * 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 android.graphics;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.os.Parcel;
import android.os.Parcelable;

/**
 * Point holds two integer coordinates
 */
public class Point implements Parcelable {
    public int x;
    public int y;

    public Point() {}

    public Point(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public Point(@NonNull Point src) {
        this.x = src.x;
        this.y = src.y;
    }

    /**
     * Set the point's x and y coordinates
     */
    public void set(int x, int y) {
        this.x = x;
        this.y = y;
    }

    /**
     * Negate the point's coordinates
     */
    public final void negate() {
        x = -x;
        y = -y;
    }

    /**
     * Offset the point's coordinates by dx, dy
     */
    public final void offset(int dx, int dy) {
        x += dx;
        y += dy;
    }

    /**
     * Returns true if the point's coordinates equal (x,y)
     */
    public final boolean equals(int x, int y) {
        return this.x == x && this.y == y;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Point point = (Point) o;

        if (x != point.x) return false;
        if (y != point.y) return false;

        return true;
    }

    @Override
    public int hashCode() {
        int result = x;
        result = 31 * result + y;
        return result;
    }

    @Override
    public String toString() {
        return "Point(" + x + ", " + y + ")";
    }

    /**
     * @return Returns a {@link String} that represents this point which can be parsed with
     * {@link #unflattenFromString(String)}.
     * @hide
     */
    @NonNull
    public String flattenToString() {
        return x + "x" + y;
    }

    /**
     * @return Returns a {@link Point} from a short string created from {@link #flattenToString()}.
     * @hide
     */
    @Nullable
    public static Point unflattenFromString(String s) throws NumberFormatException {
        final int sep_ix = s.indexOf("x");
        return new Point(Integer.parseInt(s.substring(0, sep_ix)),
                Integer.parseInt(s.substring(sep_ix + 1)));
    }

    /**
     * Parcelable interface methods
     */
    @Override
    public int describeContents() {
        return 0;
    }

    /**
     * Write this point to the specified parcel. To restore a point from
     * a parcel, use readFromParcel()
     * @param out The parcel to write the point's coordinates into
     */
    @Override
    public void writeToParcel(Parcel out, int flags) {
        out.writeInt(x);
        out.writeInt(y);
    }

    public static final @android.annotation.NonNull Parcelable.Creator<Point> CREATOR = new Parcelable.Creator<Point>() {
        /**
         * Return a new point from the data in the specified parcel.
         */
        @Override
        public Point createFromParcel(Parcel in) {
            Point r = new Point();
            r.readFromParcel(in);
            return r;
        }

        /**
         * Return an array of rectangles of the specified size.
         */
        @Override
        public Point[] newArray(int size) {
            return new Point[size];
        }
    };

    /**
     * Set the point's coordinates from the data stored in the specified
     * parcel. To write a point to a parcel, call writeToParcel().
     *
     * @param in The parcel to read the point's coordinates from
     */
    public void readFromParcel(@NonNull Parcel in) {
        x = in.readInt();
        y = in.readInt();
    }
}