PointF.java revision 54b6cfa9a9e5b861a9930af873580d6dc20f773c 
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
17package android.graphics;
18
19import android.util.FloatMath;
20
21
22/**
23 * PointF holds two float coordinates
24 */
25public class PointF {
26    public float x;
27    public float y;
28
29    public PointF() {}
30
31    public PointF(float x, float y) {
32        this.x = x;
33        this.y = y;
34    }
35
36    public PointF(Point p) {
37        this.x = p.x;
38        this.y = p.y;
39    }
40
41    /**
42     * Set the point's x and y coordinates
43     */
44    public final void set(float x, float y) {
45        this.x = x;
46        this.y = y;
47    }
48
49    /**
50     * Set the point's x and y coordinates to the coordinates of p
51     */
52    public final void set(PointF p) {
53        this.x = p.x;
54        this.y = p.y;
55    }
56
57    public final void negate() {
58        x = -x;
59        y = -y;
60    }
61
62    public final void offset(float dx, float dy) {
63        x += dx;
64        y += dy;
65    }
66
67    /**
68     * Returns true if the point's coordinates equal (x,y)
69     */
70    public final boolean equals(float x, float y) {
71        return this.x == x && this.y == y;
72    }
73
74    /**
75     * Return the euclidian distance from (0,0) to the point
76     */
77    public final float length() {
78        return length(x, y);
79    }
80
81    /**
82     * Returns the euclidian distance from (0,0) to (x,y)
83     */
84    public static float length(float x, float y) {
85        return FloatMath.sqrt(x * x + y * y);
86    }
87}
88
89