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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 
     35     float lengthSquared() const {
     36         return x * x + y * y;
     37     }
     38 
     39     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 
     89     void normalize() {
     90         float s = 1.0f / length();
     91         x *= s;
     92         y *= s;
     93     }
     94 
     95     Vector2 copyNormalized() const {
     96         Vector2 v = {x, y};
     97         v.normalize();
     98         return v;
     99     }
    100 
    101     float dot(const Vector2& v) const {
    102         return x * v.x + y * v.y;
    103     }
    104 
    105     float cross(const Vector2& v) const {
    106         return x * v.y - y * v.x;
    107     }
    108 
    109     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