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1 /*
2  * Copyright (C) 2010 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 #ifndef ANDROID_HWUI_VECTOR_H
18 #define ANDROID_HWUI_VECTOR_H
19 
20 #include <math.h>
21 #include <utils/Log.h>
22 
23 namespace android {
24 namespace uirenderer {
25 
26 ///////////////////////////////////////////////////////////////////////////////
27 // Classes
28 ///////////////////////////////////////////////////////////////////////////////
29 
30 // MUST BE A POD - this means no ctor or dtor!
31 struct Vector2 {
32     float x;
33     float y;
34 
lengthSquaredVector235     float lengthSquared() const {
36         return x * x + y * y;
37     }
38 
lengthVector239     float length() const {
40         return sqrt(x * x + y * y);
41     }
42 
43     void operator+=(const Vector2& v) {
44         x += v.x;
45         y += v.y;
46     }
47 
48     void operator-=(const Vector2& v) {
49         x -= v.x;
50         y -= v.y;
51     }
52 
53     void operator+=(const float v) {
54         x += v;
55         y += v;
56     }
57 
58     void operator-=(const float v) {
59         x -= v;
60         y -= v;
61     }
62 
63     void operator/=(float s) {
64         x /= s;
65         y /= s;
66     }
67 
68     void operator*=(float s) {
69         x *= s;
70         y *= s;
71     }
72 
73     Vector2 operator+(const Vector2& v) const {
74         return (Vector2){x + v.x, y + v.y};
75     }
76 
77     Vector2 operator-(const Vector2& v) const {
78         return (Vector2){x - v.x, y - v.y};
79     }
80 
81     Vector2 operator/(float s) const {
82         return (Vector2){x / s, y / s};
83     }
84 
85     Vector2 operator*(float s) const {
86         return (Vector2){x * s, y * s};
87     }
88 
normalizeVector289     void normalize() {
90         float s = 1.0f / length();
91         x *= s;
92         y *= s;
93     }
94 
copyNormalizedVector295     Vector2 copyNormalized() const {
96         Vector2 v = {x, y};
97         v.normalize();
98         return v;
99     }
100 
dotVector2101     float dot(const Vector2& v) const {
102         return x * v.x + y * v.y;
103     }
104 
crossVector2105     float cross(const Vector2& v) const {
106         return x * v.y - y * v.x;
107     }
108 
dumpVector2109     void dump() {
110         ALOGD("Vector2[%.2f, %.2f]", x, y);
111     }
112 }; // class Vector2
113 
114 // MUST BE A POD - this means no ctor or dtor!
115 class Vector3 {
116 public:
117     float x;
118     float y;
119     float z;
120 
121     Vector3 operator+(const Vector3& v) const {
122         return (Vector3){x + v.x, y + v.y, z + v.z};
123     }
124 
125     Vector3 operator-(const Vector3& v) const {
126         return (Vector3){x - v.x, y - v.y, z - v.z};
127     }
128 
129     Vector3 operator/(float s) const {
130         return (Vector3){x / s, y / s, z / s};
131     }
132 
133     Vector3 operator*(float s) const {
134         return (Vector3){x * s, y * s, z * s};
135     }
136 
137 
138     void dump(const char* label = "Vector3") const {
139         ALOGD("%s[%.2f, %.2f, %.2f]", label, x, y, z);
140     }
141 };
142 
143 }; // namespace uirenderer
144 }; // namespace android
145 
146 #endif // ANDROID_HWUI_VECTOR_H
147