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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 { return x * x + y * y; }
     36 
     37     float length() const { return sqrt(x * x + y * y); }
     38 
     39     void operator+=(const Vector2& v) {
     40         x += v.x;
     41         y += v.y;
     42     }
     43 
     44     void operator-=(const Vector2& v) {
     45         x -= v.x;
     46         y -= v.y;
     47     }
     48 
     49     void operator+=(const float v) {
     50         x += v;
     51         y += v;
     52     }
     53 
     54     void operator-=(const float v) {
     55         x -= v;
     56         y -= v;
     57     }
     58 
     59     void operator/=(float s) {
     60         x /= s;
     61         y /= s;
     62     }
     63 
     64     void operator*=(float s) {
     65         x *= s;
     66         y *= s;
     67     }
     68 
     69     Vector2 operator+(const Vector2& v) const { return (Vector2){x + v.x, y + v.y}; }
     70 
     71     Vector2 operator-(const Vector2& v) const { return (Vector2){x - v.x, y - v.y}; }
     72 
     73     Vector2 operator/(float s) const { return (Vector2){x / s, y / s}; }
     74 
     75     Vector2 operator*(float s) const { return (Vector2){x * s, y * s}; }
     76 
     77     void normalize() {
     78         float s = 1.0f / length();
     79         x *= s;
     80         y *= s;
     81     }
     82 
     83     Vector2 copyNormalized() const {
     84         Vector2 v = {x, y};
     85         v.normalize();
     86         return v;
     87     }
     88 
     89     float dot(const Vector2& v) const { return x * v.x + y * v.y; }
     90 
     91     float cross(const Vector2& v) const { return x * v.y - y * v.x; }
     92 
     93     void dump() { ALOGD("Vector2[%.2f, %.2f]", x, y); }
     94 };  // class Vector2
     95 
     96 // MUST BE A POD - this means no ctor or dtor!
     97 class Vector3 {
     98 public:
     99     float x;
    100     float y;
    101     float z;
    102 
    103     Vector3 operator+(const Vector3& v) const { return (Vector3){x + v.x, y + v.y, z + v.z}; }
    104 
    105     Vector3 operator-(const Vector3& v) const { return (Vector3){x - v.x, y - v.y, z - v.z}; }
    106 
    107     Vector3 operator/(float s) const { return (Vector3){x / s, y / s, z / s}; }
    108 
    109     Vector3 operator*(float s) const { return (Vector3){x * s, y * s, z * s}; }
    110 
    111     void dump(const char* label = "Vector3") const {
    112         ALOGD("%s[%.2f, %.2f, %.2f]", label, x, y, z);
    113     }
    114 };
    115 
    116 };  // namespace uirenderer
    117 };  // namespace android
    118 
    119 #endif  // ANDROID_HWUI_VECTOR_H
    120