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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 /**
     20  * A component that allows a game object to act like a solid object by submitting surfaces to the
     21  * background collision system every frame.
     22  */
     23 public class SolidSurfaceComponent extends GameComponent {
     24     private FixedSizeArray<Vector2> mStartPoints;
     25     private FixedSizeArray<Vector2> mEndPoints;
     26     private FixedSizeArray<Vector2> mNormals;
     27     private Vector2 mStart;
     28     private Vector2 mEnd;
     29     private Vector2 mNormal;
     30 
     31     public SolidSurfaceComponent(int maxSurfaceCount) {
     32         super();
     33 
     34         inititalize(maxSurfaceCount);
     35 
     36         mStart = new Vector2();
     37         mEnd = new Vector2();
     38         mNormal = new Vector2();
     39 
     40         setPhase(ComponentPhases.POST_COLLISION.ordinal());
     41         reset();
     42     }
     43 
     44     @Override
     45     public void reset() {
     46         mStartPoints.clear();
     47         mEndPoints.clear();
     48         mNormals.clear();
     49     }
     50 
     51     public SolidSurfaceComponent() {
     52         super();
     53 
     54         mStart = new Vector2();
     55         mEnd = new Vector2();
     56         mNormal = new Vector2();
     57 
     58         setPhase(ComponentPhases.POST_COLLISION.ordinal());
     59     }
     60 
     61     public void inititalize(int maxSurfaceCount) {
     62         if (mStartPoints == null
     63                 || (mStartPoints != null && mStartPoints.getCount() != maxSurfaceCount)) {
     64             mStartPoints = new FixedSizeArray<Vector2>(maxSurfaceCount);
     65             mEndPoints = new FixedSizeArray<Vector2>(maxSurfaceCount);
     66             mNormals = new FixedSizeArray<Vector2>(maxSurfaceCount);
     67         }
     68 
     69         mStartPoints.clear();
     70         mEndPoints.clear();
     71         mNormals.clear();
     72     }
     73 
     74     // Note that this function keeps direct references to the arguments it is passed.
     75     public void addSurface(Vector2 startPoint, Vector2 endPoint, Vector2 normal) {
     76         mStartPoints.add(startPoint);
     77         mEndPoints.add(endPoint);
     78         mNormals.add(normal);
     79     }
     80 
     81     @Override
     82     public void update(float timeDelta, BaseObject parent) {
     83         CollisionSystem collision = sSystemRegistry.collisionSystem;
     84 
     85         final FixedSizeArray<Vector2> startPoints = mStartPoints;
     86         final FixedSizeArray<Vector2> endPoints = mEndPoints;
     87         final FixedSizeArray<Vector2> normals = mNormals;
     88 
     89         final int surfaceCount = startPoints.getCount();
     90         if (collision != null && surfaceCount > 0) {
     91             GameObject parentObject = (GameObject)parent;
     92             final Vector2 position = parentObject.getPosition();
     93             Vector2 start = mStart;
     94             Vector2 end = mEnd;
     95             Vector2 normal = mNormal;
     96 
     97             for (int x = 0; x < surfaceCount; x++) {
     98                start.set(startPoints.get(x));
     99                if (parentObject.facingDirection.x < 0.0f) {
    100                    start.flipHorizontal(parentObject.width);
    101                }
    102 
    103                if (parentObject.facingDirection.y < 0.0f) {
    104                    start.flipVertical(parentObject.height);
    105                }
    106                start.add(position);
    107 
    108                end.set(endPoints.get(x));
    109                if (parentObject.facingDirection.x < 0.0f) {
    110                    end.flipHorizontal(parentObject.width);
    111                }
    112 
    113                if (parentObject.facingDirection.y < 0.0f) {
    114                    end.flipVertical(parentObject.height);
    115                }
    116                end.add(position);
    117 
    118                normal.set(normals.get(x));
    119                if (parentObject.facingDirection.x < 0.0f) {
    120                    normal.flipHorizontal(0);
    121                }
    122 
    123                if (parentObject.facingDirection.y < 0.0f) {
    124                    normal.flipVertical(0);
    125                }
    126 
    127                collision.addTemporarySurface(start, end, normal, parentObject);
    128             }
    129 
    130 
    131         }
    132     }
    133 
    134 }
    135