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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 package com.replica.replicaisland;
     18 
     19 import com.replica.replicaisland.CollisionParameters.HitType;
     20 
     21 /**
     22  * CollisionVolume describes a volume (rectangle, sphere, etc) used for dynamic collision detection.
     23  * Volumes can be tested for intersection against other volumes, and can be grown to contain a set
     24  * of other volumes.  The volume itself is stored in object-relative space (in terms of offsets from
     25  * some origin); when used with game objects the position of the parent object must be passed to
     26  * a parameter of the intersection test.  This means that a single instance of a CollisionVolume and
     27  * its derivatives is safe to share amongst many game object instances.
     28  */
     29 public abstract class CollisionVolume extends AllocationGuard {
     30     // TODO: does this really belong here?
     31     // When used as an attack volume, mHitType specifies the type of hit that the volume deals.
     32     // When used as a vulnerability volume, it specifies which type the volume is vulernable to
     33     // (invalid = all types).
     34     public int mHitType;
     35 
     36     public CollisionVolume() {
     37         super();
     38         mHitType = HitType.INVALID;
     39     }
     40 
     41     public CollisionVolume(int type) {
     42         super();
     43         mHitType = type;
     44     }
     45 
     46     public void setHitType(int type) {
     47         mHitType = type;
     48     }
     49 
     50     public int getHitType() {
     51         return mHitType;
     52     }
     53 
     54 
     55     public abstract boolean intersects(Vector2 position, FlipInfo flip, CollisionVolume other,
     56             Vector2 otherPosition, FlipInfo otherFlip);
     57 
     58     public float getMinXPosition(FlipInfo flip) {
     59         float value = 0;
     60         if (flip != null && flip.flipX) {
     61             final float maxX = getMaxX();
     62             value = flip.parentWidth - maxX;
     63         } else {
     64             value = getMinX();
     65         }
     66         return value;
     67     }
     68 
     69     public float getMaxXPosition(FlipInfo flip) {
     70         float value = 0;
     71         if (flip != null && flip.flipX) {
     72             final float minX = getMinX();
     73             value = flip.parentWidth - minX;
     74         } else {
     75             value = getMaxX();
     76         }
     77         return value;
     78     }
     79 
     80     public float getMinYPosition(FlipInfo flip) {
     81         float value = 0;
     82         if (flip != null && flip.flipY) {
     83             final float maxY = getMaxY();
     84             value = flip.parentHeight - maxY;
     85         } else {
     86             value = getMinY();
     87         }
     88         return value;
     89     }
     90 
     91     public float getMaxYPosition(FlipInfo flip) {
     92         float value = 0;
     93         if (flip != null && flip.flipY) {
     94             final float minY = getMinY();
     95             value = flip.parentHeight - minY;
     96         } else {
     97             value = getMaxY();
     98         }
     99         return value;
    100     }
    101 
    102     protected abstract float getMinX();
    103     protected abstract float getMaxX();
    104     protected abstract float getMinY();
    105     protected abstract float getMaxY();
    106 
    107 
    108     public static class FlipInfo {
    109         public boolean flipX;
    110         public boolean flipY;
    111         public float parentWidth;
    112         public float parentHeight;
    113     }
    114 }
    115