alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix

# Android example source code file (Vector3.java)

This example Android source code file (Vector3.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

vector3, zero

## The Vector3.java Android example source code

```/*
* Copyright (C) 2010 The Android Open Source Project
*
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
*/

package com.android.heightmapprofiler;

/**
* Simple 3D vector class.  Handles basic vector math for 3D vectors.
*/
public final class Vector3 {
public float x;
public float y;
public float z;

public static final Vector3 ZERO = new Vector3(0, 0, 0);

public Vector3() {
}

public Vector3(float xValue, float yValue, float zValue) {
set(xValue, yValue, zValue);
}

public Vector3(Vector3 other) {
set(other);
}

public final void add(Vector3 other) {
x += other.x;
y += other.y;
z += other.z;
}

public final void add(float otherX, float otherY, float otherZ) {
x += otherX;
y += otherY;
z += otherZ;
}

public final void subtract(Vector3 other) {
x -= other.x;
y -= other.y;
z -= other.z;
}

public final void multiply(float magnitude) {
x *= magnitude;
y *= magnitude;
z *= magnitude;
}

public final void multiply(Vector3 other) {
x *= other.x;
y *= other.y;
z *= other.z;
}

public final void divide(float magnitude) {
if (magnitude != 0.0f) {
x /= magnitude;
y /= magnitude;
z /= magnitude;
}
}

public final void set(Vector3 other) {
x = other.x;
y = other.y;
z = other.z;
}

public final void set(float xValue, float yValue, float zValue) {
x = xValue;
y = yValue;
z = zValue;
}

public final float dot(Vector3 other) {
return (x * other.x) + (y * other.y) + (z * other.z);
}

public final float length() {
return (float) Math.sqrt(length2());
}

public final float length2() {
return (x * x) + (y * y) + (z * z);
}

public final float distance2(Vector3 other) {
float dx = x - other.x;
float dy = y - other.y;
float dz = z - other.z;
return (dx * dx) + (dy * dy) + (dz * dz);
}

public final float normalize() {
final float magnitude = length();

// TODO: I'm choosing safety over speed here.
if (magnitude != 0.0f) {
x /= magnitude;
y /= magnitude;
z /= magnitude;
}

return magnitude;
}

public final void zero() {
set(0.0f, 0.0f, 0.0f);
}

}
```

## Other Android examples (source code examples)

Here is a short list of links related to this Android Vector3.java source code file:

 ... this post is sponsored by my books ... #1 New Release! FP Best Seller