Distorted Android

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// Copyright 2016 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// Distorted is free software: you can redistribute it and/or modify                             //

// it under the terms of the GNU General Public License as published by                          //

// the Free Software Foundation, either version 2 of the License, or                             //

// (at your option) any later version.                                                           //

//                                                                                               //

// Distorted is distributed in the hope that it will be useful,                                  //

// but WITHOUT ANY WARRANTY; without even the implied warranty of                                //

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                                 //

// GNU General Public License for more details.                                                  //

//                                                                                               //

// You should have received a copy of the GNU General Public License                             //

// along with Distorted.  If not, see <http://www.gnu.org/licenses/>.                            //

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package org.distorted.library.type;

import java.util.Vector;

///////////////////////////////////////////////////////////////////////////////////////////////////

/** 

* A 1-dimensional implementation of the Dynamic class to interpolate between a list

* of Static1Ds.

*/

public class Dynamic1D extends Dynamic implements Data1D

  {

  private Vector<Static1D> vv;

  private Static1D prev, curr, next;

///////////////////////////////////////////////////////////////////////////////////////////////////

// no array bounds checking!

  private void vec(int c)

    {

    int p = c>0 ? c-1: numPoints-1;

    int n = c<numPoints-1 ? c+1: 0;

    prev = vv.elementAt(p);

    curr = vv.elementAt(c);

    next = vv.elementAt(n);

    tmp1 = vc.elementAt(c);

    float px = curr.x - prev.x;

    float nx = next.x - curr.x;

    float d = nx*nx;

    if( d>0 )

      {

      float q = (float)Math.sqrt((px*px)/d);

      if( q>1 )

        {

        tmp1.tangent[0] = nx+px/q;

        }

      else

        {

        tmp1.tangent[0] = px+nx*q;

        }

      }

    else

      {

      tmp1.tangent[0] = 0.0f;

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  private void recomputeCache()

    {  

    if( numPoints==1 )

      {

      tmp1= vc.elementAt(0);

      curr= vv.elementAt(0);

      tmp1.a[0] = 0.0f;

      tmp1.b[0] = 0.0f;

      tmp1.c[0] = curr.x;

      tmp1.d[0] = 0.0f;

      }

    else if( numPoints==2 )

      {

      tmp1= vc.elementAt(0);

      tmp2= vc.elementAt(1);

      curr= vv.elementAt(0);

      next= vv.elementAt(1);

      tmp1.a[0] = 0.0f;

      tmp1.b[0] = 0.0f;

      tmp1.c[0] = next.x - curr.x;

      tmp1.d[0] = curr.x;

      tmp2.a[0] = 0.0f;

      tmp2.b[0] = 0.0f;

      tmp2.c[0] = curr.x - next.x;

      tmp2.d[0] = next.x;

      }

    else

      {

      int i, n;  

      for(i=0; i<numPoints; i++) vec(i);

      for(i=0; i<numPoints; i++)

        {

        n = i<numPoints-1 ? i+1:0;  

        tmp1= vc.elementAt(i);

        tmp2= vc.elementAt(n);

        curr= vv.elementAt(i);

        next= vv.elementAt(n);

        tmp1.cached[0] = curr.x;

        tmp1.a[0] =  2*curr.x +   tmp1.tangent[0] - 2*next.x + tmp2.tangent[0];

        tmp1.b[0] = -3*curr.x - 2*tmp1.tangent[0] + 3*next.x - tmp2.tangent[0];

        tmp1.c[0] = tmp1.tangent[0];

        tmp1.d[0] = curr.x;

        }

      }

    cacheDirty = false;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

// PUBLIC API

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Default constructor.

 */

  public Dynamic1D()

    {

    super(0,0.5f,1);

    vv = new Vector<>();

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Constructor setting the speed of interpolation and the number of revolutions.

 *

 * What constitutes 'one revolution' depends on the MODE:

 * {@link Dynamic#MODE_LOOP}, {@link Dynamic#MODE_PATH} or {@link Dynamic#MODE_JUMP}.

 *

 * @param duration number of milliseconds it takes to do one revolution.

 * @param count    number of revolutions we will do. Count<=0 means 'infinite'.

 */

  public Dynamic1D(int duration, float count)

    {

    super(duration,count,1);

    vv = new Vector<>();

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Returns the location'th Static1D.

 *   

 * @param location the index of the Point we are interested in.

 * @return The Static1D, if 0<=location&lt;getNumPoints(), or null otherwise.

 */

  public synchronized Static1D getPoint(int location)

    {

    return (location>=0 && location<numPoints) ? vv.elementAt(location) : null;  

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Resets the location'th Point.

 * 

 * @param location the index of the Point we are setting.

 * @param x New value of its first float.

 */

  public synchronized void setPoint(int location, float x)

    {

    if( location>=0 && location<numPoints )

      {

      curr = vv.elementAt(location);

      if( curr!=null )

        {

        curr.set(x);

        cacheDirty=true;

        }

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Adds a new Static1D to the end of our list of Points to interpolate through.

 * <p>   

 * Only a reference to the Point gets added to the List; this means that one can add a Point 

 * here, and later on {@link Static1D#set(float)} it to some new value and the change will

 * be seamlessly reflected in the interpolated path.  

 * <p>

 * A Point can be added multiple times.

 *   

 * @param v The Point to add.

 */

  public synchronized void add(Static1D v)

    {

    if( v!=null )

      {

      vv.add(v);

      if( vn!=null ) vn.add(new VectorNoise());

      switch(numPoints)

        {

        case 0: 

        case 1: break;

        case 2: vc.add(new VectorCache());

                vc.add(new VectorCache());

                vc.add(new VectorCache());

                cacheDirty = true;

                break;

        default:vc.add(new VectorCache());

                cacheDirty = true;

        }

      numPoints++;

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Adds a new Static1D to the location'th place in our List of Points to interpolate through.

 *   

 * @param location Index in our List to add the new Point at.

 * @param v The Point to add.

 */

  public synchronized void add(int location, Static1D v)

    {

    if( v!=null )

      {

      vv.add(location, v);

      if( vn!=null ) vn.add(new VectorNoise());

      switch(numPoints)

        {

        case 0:

        case 1: break;

        case 2: vc.add(new VectorCache());

                vc.add(new VectorCache());

                vc.add(new VectorCache());

                cacheDirty = true;

                break;

        default:vc.add(location,new VectorCache());

                cacheDirty = true;

        }

      numPoints++;

      }

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Removes all occurrences of Point v from the List of Points to interpolate through.  

 * 

 * @param v The Point to remove.

 * @return <code>true</code> if we have removed at least one Point.

 */

  public synchronized boolean remove(Static1D v)

    {

    int n = vv.indexOf(v);

    boolean found = false;

    while( n>=0 ) 

      {

      vv.remove(n);

      if( vn!=null ) vn.remove(0);

      switch(numPoints)

        {

        case 0:

        case 1:

        case 2: break;

        case 3: vc.removeAllElements();

                break;

        default:vc.remove(n);

                cacheDirty=true;

        }

      numPoints--;

      found = true;

      n = vv.indexOf(v);

      }

    return found;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Removes a location'th Point from the List of Points we interpolate through.

 * 

 * @param location index of the Point we want to remove. 

 * @return <code>true</code> if location is valid, i.e. if 0<=location&lt;getNumPoints().

 */

  public synchronized boolean remove(int location)

    {

    if( location>=0 && location<numPoints ) 

      {

      vv.removeElementAt(location);

      if( vn!=null ) vn.remove(0);

      switch(numPoints)

        {

        case 0:

        case 1: 

        case 2: break;

        case 3: vc.removeAllElements();

                break;

        default:vc.removeElementAt(location);

        }

      numPoints--;

      cacheDirty = true; 

      return true;

      }

   return false;

   }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Removes all Points.

 */

  public synchronized void removeAll()

    {

    numPoints = 0;

    vv.removeAllElements();

    vc.removeAllElements();

    cacheDirty = false;

    if( vn!=null ) vn.removeAllElements();

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

/**

 * Sets the 'smoothness' of interpolation.

 * <p>

 * When Noise=0 (the default), we interpolate between our Points through the most smooth path possible.

 * Increasing noise makes the Dynamic increasingly deviate from this path, pseudo-randomly speeding

 * up and slowing down, etc.

 *

 * @param noise The noise level. Permitted range: 0 <= noise <= 1.

 */

  public synchronized void setNoise(Static1D noise)

    {

    if( vn==null )

      {

      vn = new Vector<>();

      for(int i=0; i<numPoints; i++) vn.add(new VectorNoise());

      if( mDimension>=2 )

        {

        mFactor = new float[mDimension-1];

        }

      mNoise = new float[mDimension];

      }

    if( noise.x<0.0f ) noise.x = 0.0f;

    if( noise.x>1.0f ) noise.x = 1.0f;

    mNoise[0] = noise.x;

    }

///////////////////////////////////////////////////////////////////////////////////////////////////

  synchronized void interpolate(float[] buffer, int offset, float time)

    {

    switch(numPoints)

      {

      case 0: buffer[offset] = 0.0f;

              break;

      case 1: curr = vv.elementAt(0);

              buffer[offset] = curr.x;

              break;

      case 2: curr = vv.elementAt(0);

              next = vv.elementAt(1);

              int segment2= (int)(2*time);

              if( mMode==MODE_LOOP || mMode==MODE_PATH ) time = (time>0.5f ? 2-2*time : 2*time);

              if( vn!=null )

                {

                if( segment2 != mSegment )

                  {

                  if(mMode!=MODE_JUMP || mSegment==1) vn.elementAt(0).computeNoise();

                  mSegment = segment2;

                  }

                time = noise(time,0);

                }

              buffer[offset] = (next.x-curr.x)*time + curr.x;

              break;

      default:float t = time;

              int vecCurr, segment;

              switch(mMode)

                {

                case MODE_LOOP: time = time*numPoints;

                                segment = (int)time;

                                vecCurr = segment;

                                break;

                case MODE_PATH: segment = (int)(2*t*(numPoints-1));

                                if( t<=0.5f )  // this has to be <= (otherwise when effect ends at t=0.5, then time=1.0

                                  {            // and end position is slightly not equal to the end point => might not get autodeleted!

                                  time = 2*t*(numPoints-1);

                                  vecCurr = segment;

                                  }

                                else

                                  {

                                  time = 2*(1-t)*(numPoints-1);

                                  vecCurr = 2*numPoints-3-segment;

                                  }

                                break;

                case MODE_JUMP: time = time*(numPoints-1);

                                segment = (int)time;

                                vecCurr = segment;

                                break;

                default       : vecCurr = 0;

                                segment = 0;

                }

              if( vecCurr>=0 && vecCurr<numPoints )

                {

                if( cacheDirty ) recomputeCache();  // recompute cache if we have added or remove vectors since last computation

                else if( mSegment!= segment )       // ...or if we have just passed a vector and the vector we are currently flying to has changed

                  {

                  int vecNext;

                  switch(mMode)

                    {

                    case MODE_LOOP: vecNext = vecCurr==numPoints-1 ? 0:vecCurr+1;

                                    break;

                    case MODE_PATH: if( t<=0.5f ) vecNext = vecCurr==numPoints-1 ? numPoints-2: vecCurr+1;

                                    else          vecNext = vecCurr==0 ? 1 : vecCurr-1;

                                    break;

                    case MODE_JUMP: vecNext = vecCurr==numPoints-1 ? 1:vecCurr+1;

                                    break;

                    default       : vecNext = 0;

                    }

                  next = vv.elementAt(vecNext);

                  tmp2 = vc.elementAt(vecNext);

                  if( tmp2.cached[0]!=next.x ) recomputeCache();

                  }

                if( mSegment!= segment && vn!=null ) vn.elementAt(vecCurr).computeNoise();

                mSegment = segment;

                time = time-vecCurr;

                tmp1 = vc.elementAt(vecCurr);

                if( vn!=null )

                  {

                  time = noise(time,vecCurr);

                  }

                buffer[offset] = ((tmp1.a[0]*time+tmp1.b[0])*time+tmp1.c[0])*time+tmp1.d[0];

                break;

                }

        }

     }  

  }

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//