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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 namespace android {
     21 namespace uirenderer {
     22 
     23 ///////////////////////////////////////////////////////////////////////////////
     24 // Classes
     25 ///////////////////////////////////////////////////////////////////////////////
     26 
     27 struct Vector2 {
     28     float x;
     29     float y;
     30 
     31     Vector2() :
     32         x(0.0f), y(0.0f) {
     33     }
     34 
     35     Vector2(float px, float py) :
     36         x(px), y(py) {
     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     void dump() {
    106         ALOGD("Vector2[%.2f, %.2f]", x, y);
    107     }
    108 }; // class Vector2
    109 
    110 ///////////////////////////////////////////////////////////////////////////////
    111 // Types
    112 ///////////////////////////////////////////////////////////////////////////////
    113 
    114 typedef Vector2 vec2;
    115 
    116 }; // namespace uirenderer
    117 }; // namespace android
    118 
    119 #endif // ANDROID_HWUI_VECTOR_H
    120