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package org.distorted.library;
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import java.util.Vector;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* A 1-dimensional implementation of the Interpolator class to interpolate between a list
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* of Float1Ds.
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*/
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public class Interpolator1D extends Interpolator
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{
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// the coefficients of the X(t) polynomials: X(t) = ax*T^3 + bx*T^2 + cx*t + dx etc.
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// (x) is the vector tangent to the path.
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// (vx) is the original vector from vv (copied here so when interpolating we can see if it is
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// still valid and if not - rebuild the Cache
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private class VectorCache
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{
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float ax, bx, cx, dx;
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float x;
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float vx;
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}
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private class VectorNoise
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{
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float[] nx;
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public VectorNoise()
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{
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nx = new float[NUM_NOISE];
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nx[0] = mRnd.nextFloat();
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for(int i=1; i<NUM_NOISE; i++) nx[i] = nx[i-1]+mRnd.nextFloat();
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float sum = nx[NUM_NOISE-1] + mRnd.nextFloat();
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for(int i=0; i<NUM_NOISE; i++) nx[i] /=sum;
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}
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}
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private Vector<VectorCache> vc;
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private VectorCache tmp1, tmp2;
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private Vector<Float1D> vv;
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private Float1D prev, curr, next;
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private Vector<VectorNoise> vn;
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private VectorNoise tmpN;
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///////////////////////////////////////////////////////////////////////////////////////////////////
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synchronized void createNoise()
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{
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if( vn==null )
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{
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vn = new Vector<VectorNoise>();
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for(int i=0; i<numPoints; i++) vn.add(new VectorNoise());
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// no array bounds checking!
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private void vec(int c)
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{
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int p = c>0 ? c-1: numPoints-1;
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int n = c<numPoints-1 ? c+1: 0;
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prev = vv.elementAt(p);
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curr = vv.elementAt(c);
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next = vv.elementAt(n);
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tmp1 = vc.elementAt(c);
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float px = curr.x - prev.x;
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float nx = next.x - curr.x;
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float d = nx*nx;
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if( d>0 )
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{
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float q = (float)Math.sqrt((px*px)/d);
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if( q>1 )
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{
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tmp1.x = nx+px/q;
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}
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else
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{
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tmp1.x = px+nx*q;
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}
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}
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else
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{
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tmp1.x = 0.0f;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private void recomputeCache()
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{
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if( numPoints==1 )
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{
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tmp1= vc.elementAt(0);
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curr= vv.elementAt(0);
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tmp1.ax = 0.0f;
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tmp1.bx = 0.0f;
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tmp1.cx = curr.x;
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tmp1.dx = 0.0f;
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}
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else if( numPoints==2 )
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{
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tmp1= vc.elementAt(0);
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tmp2= vc.elementAt(1);
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curr= vv.elementAt(0);
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next= vv.elementAt(1);
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tmp1.ax = 0.0f;
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tmp1.bx = 0.0f;
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tmp1.cx = next.x - curr.x;
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tmp1.dx = curr.x;
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tmp2.ax = 0.0f;
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tmp2.bx = 0.0f;
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tmp2.cx = curr.x - next.x;
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tmp2.dx = next.x;
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}
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else
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{
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int i, n;
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for(i=0; i<numPoints; i++) vec(i);
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for(i=0; i<numPoints; i++)
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{
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n = i<numPoints-1 ? i+1:0;
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tmp1= vc.elementAt(i);
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tmp2= vc.elementAt(n);
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curr= vv.elementAt(i);
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next= vv.elementAt(n);
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tmp1.vx = curr.x;
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tmp1.ax = 2*curr.x + tmp1.x - 2*next.x + tmp2.x;
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tmp1.bx = -3*curr.x - 2*tmp1.x + 3*next.x - tmp2.x;
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tmp1.cx = tmp1.x;
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tmp1.dx = curr.x;
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}
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}
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cacheDirty = false;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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private float noise(float time,int vecNum)
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{
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float lower, upper, len;
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float d = time*(NUM_NOISE+1);
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int index = (int)d;
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if( index>=NUM_NOISE+1 ) index=NUM_NOISE;
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tmpN = vn.elementAt(vecNum);
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if( index==0 )
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{
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len = 1.0f/(NUM_NOISE+1);
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return (len + mNoise*(tmpN.nx[0]-len))*d;
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}
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if( index==NUM_NOISE )
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{
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len = ((float)NUM_NOISE)/(NUM_NOISE+1);
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lower = len + mNoise*(tmpN.nx[NUM_NOISE-1]-len);
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return (1.0f-lower)*(d-NUM_NOISE) + lower;
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}
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len = ((float)index)/(NUM_NOISE+1);
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lower = len + mNoise*(tmpN.nx[index-1]-len);
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len = ((float)index+1)/(NUM_NOISE+1);
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upper = len + mNoise*(tmpN.nx[index ]-len);
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return (upper-lower)*(d-index) + lower;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// PUBLIC API
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Default constructor.
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*/
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public Interpolator1D()
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{
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vv = new Vector<Float1D>();
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vc = new Vector<VectorCache>();
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vn = null;
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numPoints = 0;
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cacheDirty = false;
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mMode = MODE_LOOP;
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mDuration = 0;
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mCount = 0.5f;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Returns the location'th Float1D.
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*
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* @param location the index of the Point we are interested in.
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* @return The Float1D, if 0<=location<getNumPoints(), or null otherwise.
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*/
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public synchronized Float1D getPoint(int location)
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{
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return (location>=0 && location<numPoints) ? vv.elementAt(location) : null;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Resets the location'th Point.
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*
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* @param location the index of the Point we are setting.
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* @param x New value of its first float.
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*/
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public synchronized void setPoint(int location, float x)
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{
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if( location>=0 && location<numPoints )
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{
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curr = vv.elementAt(location);
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if( curr!=null )
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{
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curr.set(x);
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cacheDirty=true;
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}
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Adds a new Float1D to the end of our list of Points to interpolate through.
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* <p>
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* Only a reference to the Point gets added to the List; this means that one can add a Point
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* here, and later on {@link Float1D#set(float)} it to some new value and the change will
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* be seamlessly reflected in the interpolated path.
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* <p>
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* A Point can be added multiple times.
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*
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* @param v The Point to add.
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*/
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public synchronized void add(Float1D v)
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{
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if( v!=null )
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{
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vv.add(v);
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if( vn!=null ) vn.add(new VectorNoise());
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switch(numPoints)
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{
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case 0:
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case 1: break;
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case 2: vc.add(new VectorCache());
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vc.add(new VectorCache());
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vc.add(new VectorCache());
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cacheDirty = true;
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break;
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default:vc.add(new VectorCache());
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cacheDirty = true;
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}
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numPoints++;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Adds a new Float1D to the location'th place in our List of Points to interpolate through.
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*
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* @param location Index in our List to add the new Point at.
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* @param v The Point to add.
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*/
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public synchronized void add(int location, Float1D v)
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{
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if( v!=null )
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{
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vv.add(location, v);
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if( vn!=null ) vn.add(new VectorNoise());
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switch(numPoints)
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{
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case 0:
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case 1: break;
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case 2: vc.add(new VectorCache());
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vc.add(new VectorCache());
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vc.add(new VectorCache());
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cacheDirty = true;
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break;
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default:vc.add(location,new VectorCache());
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cacheDirty = true;
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}
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numPoints++;
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Removes all occurrences of Point v from the List of Points to interpolate through.
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*
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* @param v The Point to remove.
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* @return <code>true</code> if we have removed at least one Point.
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*/
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public synchronized boolean remove(Float1D v)
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{
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int n = vv.indexOf(v);
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boolean found = false;
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while( n>=0 )
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{
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vv.remove(n);
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if( vn!=null ) vn.remove(0);
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switch(numPoints)
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{
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case 0:
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case 1:
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case 2: break;
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case 3: vc.removeAllElements();
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break;
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default:vc.remove(n);
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cacheDirty=true;
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}
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numPoints--;
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found = true;
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n = vv.indexOf(v);
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}
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341
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return found;
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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/**
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* Removes a location'th Point from the List of Points we interpolate through.
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348
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*
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* @param location index of the Point we want to remove.
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350
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* @return <code>true</code> if location is valid, i.e. if 0<=location<getNumPoints().
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351
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*/
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352
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public synchronized boolean remove(int location)
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353
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{
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354
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if( location>=0 && location<numPoints )
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{
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356
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vv.removeElementAt(location);
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357
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358
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if( vn!=null ) vn.remove(0);
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359
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360
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switch(numPoints)
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{
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362
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case 0:
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363
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case 1:
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case 2: break;
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365
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case 3: vc.removeAllElements();
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break;
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367
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default:vc.removeElementAt(location);
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368
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}
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369
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370
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numPoints--;
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371
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cacheDirty = true;
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372
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return true;
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373
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}
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374
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375
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return false;
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376
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}
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377
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378
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///////////////////////////////////////////////////////////////////////////////////////////////////
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379
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/**
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380
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* Removes all Points.
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381
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*/
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382
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public synchronized void removeAll()
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383
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{
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384
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numPoints = 0;
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385
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vv.removeAllElements();
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386
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vc.removeAllElements();
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387
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cacheDirty = false;
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388
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389
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if( vn!=null ) vn.removeAllElements();
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390
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}
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391
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392
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///////////////////////////////////////////////////////////////////////////////////////////////////
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393
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/**
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394
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* Writes the results of interpolation between the Points at time 'time' to the passed float buffer.
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395
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* <p>
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396
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* Since this is a 1-dimensional Interpolator, the resulting interpolated Float1D gets written
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397
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* to a single location in the buffer: buffer[offset].
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398
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*
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399
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* @param buffer Float buffer we will write the resulting Float1D to.
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400
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* @param offset Offset in the buffer where to write the result.
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401
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* @param time Time of interpolation. Time=0.0 would return the first Point, Time=0.5 - the last,
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402
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* time=1.0 - the first again, and time 0.1 would be 1/5 of the way between the first and the last Points.
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403
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*/
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404
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public synchronized void interpolate(float[] buffer, int offset, float time)
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405
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{
|
406
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switch(numPoints)
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407
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{
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408
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case 0: buffer[offset] = 0.0f;
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409
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break;
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410
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case 1: curr = vv.elementAt(0);
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411
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buffer[offset] = curr.x;
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412
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break;
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413
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case 2: curr = vv.elementAt(0);
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414
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next = vv.elementAt(1);
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415
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416
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if( mMode==MODE_LOOP || mMode==MODE_PATH ) time = (time>0.5f ? 2-2*time : 2*time);
|
417
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|
418
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if( vn!=null )
|
419
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{
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420
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time = noise(time,0);
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421
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}
|
422
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|
423
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buffer[offset] = (next.x-curr.x)*time + curr.x;
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424
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break;
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425
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default:float t = time;
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426
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|
427
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switch(mMode)
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428
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{
|
429
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case MODE_LOOP: time = time*numPoints;
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430
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break;
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431
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case MODE_PATH: time = (time<=0.5f) ? 2*time*(numPoints-1) : 2*(1-time)*(numPoints-1);
|
432
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break;
|
433
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case MODE_JUMP: time = time*(numPoints-1);
|
434
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break;
|
435
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}
|
436
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|
437
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int vecCurr = (int)time;
|
438
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time = time-vecCurr;
|
439
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|
440
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if( vecCurr>=0 && vecCurr<numPoints )
|
441
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{
|
442
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if( cacheDirty ) recomputeCache(); // recompute cache if we have added or remove vectors since last computation
|
443
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else if( mVecCurr!= vecCurr ) // ...or if we have just passed a vector and the vector we are currently flying to has changed
|
444
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{
|
445
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int vecNext;
|
446
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mVecCurr = vecCurr;
|
447
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|
448
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switch(mMode)
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449
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{
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450
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case MODE_LOOP: vecNext = vecCurr==numPoints-1 ? 0:vecCurr+1;
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451
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break;
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452
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case MODE_PATH: if( t<0.5f ) vecNext = vecCurr==numPoints-1 ? numPoints-2: vecCurr+1;
|
453
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else vecNext = vecCurr==0 ? 1 : vecCurr-1;
|
454
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break;
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455
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case MODE_JUMP: vecNext = vecCurr==numPoints-1 ? 1:vecCurr+1;
|
456
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break;
|
457
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default : vecNext = 0;
|
458
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}
|
459
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|
460
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next = vv.elementAt(vecNext);
|
461
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tmp2 = vc.elementAt(vecNext);
|
462
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|
463
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if( tmp2.vx!=next.x ) recomputeCache();
|
464
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}
|
465
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|
466
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if( vn!=null )
|
467
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{
|
468
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time = noise(time,vecCurr);
|
469
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}
|
470
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|
471
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tmp1 = vc.elementAt(vecCurr);
|
472
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buffer[offset] = ((tmp1.ax*time+tmp1.bx)*time+tmp1.cx)*time+tmp1.dx;
|
473
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break;
|
474
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}
|
475
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}
|
476
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}
|
477
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|
478
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}
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479
|
///////////////////////////////////////////////////////////////////////////////////////////////////
|
480
|
//
|