1cfd74d65d832137e20e193c960802afba73b5d38sm/* 23c1e67e433728684b5f228c5d4f3e5b1457bb271sm * Copyright (C) 2010 The Android Open Source Project 3cfd74d65d832137e20e193c960802afba73b5d38sm * 4cfd74d65d832137e20e193c960802afba73b5d38sm * Licensed under the Apache License, Version 2.0 (the "License"); 5cfd74d65d832137e20e193c960802afba73b5d38sm * you may not use this file except in compliance with the License. 6cfd74d65d832137e20e193c960802afba73b5d38sm * You may obtain a copy of the License at 7cfd74d65d832137e20e193c960802afba73b5d38sm * 8cfd74d65d832137e20e193c960802afba73b5d38sm * http://www.apache.org/licenses/LICENSE-2.0 9cfd74d65d832137e20e193c960802afba73b5d38sm * 10cfd74d65d832137e20e193c960802afba73b5d38sm * Unless required by applicable law or agreed to in writing, software 11cfd74d65d832137e20e193c960802afba73b5d38sm * distributed under the License is distributed on an "AS IS" BASIS, 12cfd74d65d832137e20e193c960802afba73b5d38sm * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13cfd74d65d832137e20e193c960802afba73b5d38sm * See the License for the specific language governing permissions and 14cfd74d65d832137e20e193c960802afba73b5d38sm * limitations under the License. 15cfd74d65d832137e20e193c960802afba73b5d38sm */ 16cfd74d65d832137e20e193c960802afba73b5d38sm 17cfd74d65d832137e20e193c960802afba73b5d38smpackage com.replica.replicaisland; 18cfd74d65d832137e20e193c960802afba73b5d38sm 19cfd74d65d832137e20e193c960802afba73b5d38sm/** 20cfd74d65d832137e20e193c960802afba73b5d38sm * Simple 2D vector class. Handles basic vector math for 2D vectors. 21cfd74d65d832137e20e193c960802afba73b5d38sm */ 22cfd74d65d832137e20e193c960802afba73b5d38smpublic final class Vector2 extends AllocationGuard { 23cfd74d65d832137e20e193c960802afba73b5d38sm public float x; 24cfd74d65d832137e20e193c960802afba73b5d38sm public float y; 25cfd74d65d832137e20e193c960802afba73b5d38sm 26cfd74d65d832137e20e193c960802afba73b5d38sm public static final Vector2 ZERO = new Vector2(0, 0); 27cfd74d65d832137e20e193c960802afba73b5d38sm 28cfd74d65d832137e20e193c960802afba73b5d38sm public Vector2() { 29cfd74d65d832137e20e193c960802afba73b5d38sm super(); 30cfd74d65d832137e20e193c960802afba73b5d38sm } 31cfd74d65d832137e20e193c960802afba73b5d38sm 32cfd74d65d832137e20e193c960802afba73b5d38sm public Vector2(float xValue, float yValue) { 33cfd74d65d832137e20e193c960802afba73b5d38sm set(xValue, yValue); 34cfd74d65d832137e20e193c960802afba73b5d38sm } 35cfd74d65d832137e20e193c960802afba73b5d38sm 36cfd74d65d832137e20e193c960802afba73b5d38sm public Vector2(Vector2 other) { 37cfd74d65d832137e20e193c960802afba73b5d38sm set(other); 38cfd74d65d832137e20e193c960802afba73b5d38sm } 39cfd74d65d832137e20e193c960802afba73b5d38sm 40cfd74d65d832137e20e193c960802afba73b5d38sm public final void add(Vector2 other) { 41cfd74d65d832137e20e193c960802afba73b5d38sm x += other.x; 42cfd74d65d832137e20e193c960802afba73b5d38sm y += other.y; 43cfd74d65d832137e20e193c960802afba73b5d38sm } 44cfd74d65d832137e20e193c960802afba73b5d38sm 45cfd74d65d832137e20e193c960802afba73b5d38sm public final void add(float otherX, float otherY) { 46cfd74d65d832137e20e193c960802afba73b5d38sm x += otherX; 47cfd74d65d832137e20e193c960802afba73b5d38sm y += otherY; 48cfd74d65d832137e20e193c960802afba73b5d38sm } 49cfd74d65d832137e20e193c960802afba73b5d38sm 50cfd74d65d832137e20e193c960802afba73b5d38sm public final void subtract(Vector2 other) { 51cfd74d65d832137e20e193c960802afba73b5d38sm x -= other.x; 52cfd74d65d832137e20e193c960802afba73b5d38sm y -= other.y; 53cfd74d65d832137e20e193c960802afba73b5d38sm } 54cfd74d65d832137e20e193c960802afba73b5d38sm 55cfd74d65d832137e20e193c960802afba73b5d38sm public final void multiply(float magnitude) { 56cfd74d65d832137e20e193c960802afba73b5d38sm x *= magnitude; 57cfd74d65d832137e20e193c960802afba73b5d38sm y *= magnitude; 58cfd74d65d832137e20e193c960802afba73b5d38sm } 59cfd74d65d832137e20e193c960802afba73b5d38sm 60cfd74d65d832137e20e193c960802afba73b5d38sm public final void multiply(Vector2 other) { 61cfd74d65d832137e20e193c960802afba73b5d38sm x *= other.x; 62cfd74d65d832137e20e193c960802afba73b5d38sm y *= other.y; 63cfd74d65d832137e20e193c960802afba73b5d38sm } 64cfd74d65d832137e20e193c960802afba73b5d38sm 65cfd74d65d832137e20e193c960802afba73b5d38sm public final void divide(float magnitude) { 66cfd74d65d832137e20e193c960802afba73b5d38sm if (magnitude != 0.0f) { 67cfd74d65d832137e20e193c960802afba73b5d38sm x /= magnitude; 68cfd74d65d832137e20e193c960802afba73b5d38sm y /= magnitude; 69cfd74d65d832137e20e193c960802afba73b5d38sm } 70cfd74d65d832137e20e193c960802afba73b5d38sm } 71cfd74d65d832137e20e193c960802afba73b5d38sm 72cfd74d65d832137e20e193c960802afba73b5d38sm public final void set(Vector2 other) { 73cfd74d65d832137e20e193c960802afba73b5d38sm x = other.x; 74cfd74d65d832137e20e193c960802afba73b5d38sm y = other.y; 75cfd74d65d832137e20e193c960802afba73b5d38sm } 76cfd74d65d832137e20e193c960802afba73b5d38sm 77cfd74d65d832137e20e193c960802afba73b5d38sm public final void set(float xValue, float yValue) { 78cfd74d65d832137e20e193c960802afba73b5d38sm x = xValue; 79cfd74d65d832137e20e193c960802afba73b5d38sm y = yValue; 80cfd74d65d832137e20e193c960802afba73b5d38sm } 81cfd74d65d832137e20e193c960802afba73b5d38sm 82cfd74d65d832137e20e193c960802afba73b5d38sm public final float dot(Vector2 other) { 83cfd74d65d832137e20e193c960802afba73b5d38sm return (x * other.x) + (y * other.y); 84cfd74d65d832137e20e193c960802afba73b5d38sm } 85cfd74d65d832137e20e193c960802afba73b5d38sm 86cfd74d65d832137e20e193c960802afba73b5d38sm public final float length() { 87cfd74d65d832137e20e193c960802afba73b5d38sm return (float) Math.sqrt(length2()); 88cfd74d65d832137e20e193c960802afba73b5d38sm } 89cfd74d65d832137e20e193c960802afba73b5d38sm 90cfd74d65d832137e20e193c960802afba73b5d38sm public final float length2() { 91cfd74d65d832137e20e193c960802afba73b5d38sm return (x * x) + (y * y); 92cfd74d65d832137e20e193c960802afba73b5d38sm } 93cfd74d65d832137e20e193c960802afba73b5d38sm 94cfd74d65d832137e20e193c960802afba73b5d38sm public final float distance2(Vector2 other) { 95cfd74d65d832137e20e193c960802afba73b5d38sm float dx = x - other.x; 96cfd74d65d832137e20e193c960802afba73b5d38sm float dy = y - other.y; 97cfd74d65d832137e20e193c960802afba73b5d38sm return (dx * dx) + (dy * dy); 98cfd74d65d832137e20e193c960802afba73b5d38sm } 99cfd74d65d832137e20e193c960802afba73b5d38sm 100cfd74d65d832137e20e193c960802afba73b5d38sm public final float normalize() { 101cfd74d65d832137e20e193c960802afba73b5d38sm final float magnitude = length(); 102cfd74d65d832137e20e193c960802afba73b5d38sm 103cfd74d65d832137e20e193c960802afba73b5d38sm // TODO: I'm choosing safety over speed here. 104cfd74d65d832137e20e193c960802afba73b5d38sm if (magnitude != 0.0f) { 105cfd74d65d832137e20e193c960802afba73b5d38sm x /= magnitude; 106cfd74d65d832137e20e193c960802afba73b5d38sm y /= magnitude; 107cfd74d65d832137e20e193c960802afba73b5d38sm } 108cfd74d65d832137e20e193c960802afba73b5d38sm 109cfd74d65d832137e20e193c960802afba73b5d38sm return magnitude; 110cfd74d65d832137e20e193c960802afba73b5d38sm } 111cfd74d65d832137e20e193c960802afba73b5d38sm 112cfd74d65d832137e20e193c960802afba73b5d38sm public final void zero() { 113cfd74d65d832137e20e193c960802afba73b5d38sm set(0.0f, 0.0f); 114cfd74d65d832137e20e193c960802afba73b5d38sm } 115cfd74d65d832137e20e193c960802afba73b5d38sm 116cfd74d65d832137e20e193c960802afba73b5d38sm public final void flipHorizontal(float aboutWidth) { 117cfd74d65d832137e20e193c960802afba73b5d38sm x = (aboutWidth - x); 118cfd74d65d832137e20e193c960802afba73b5d38sm } 119cfd74d65d832137e20e193c960802afba73b5d38sm 120cfd74d65d832137e20e193c960802afba73b5d38sm public final void flipVertical(float aboutHeight) { 121cfd74d65d832137e20e193c960802afba73b5d38sm y = (aboutHeight - y); 122cfd74d65d832137e20e193c960802afba73b5d38sm } 123cfd74d65d832137e20e193c960802afba73b5d38sm} 124