TwistyPuzzleLib

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

// Copyright 2024 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Magic Cube.                                                              //

//                                                                                               //

// Magic Cube is proprietary software licensed under an EULA which you should have received      //

// along with the code. If not, check https://distorted.org/magic/License-Magic-Cube.html        //

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

package org.distorted.objectlib.touchcontrol;

import static org.distorted.objectlib.main.TwistyObject.SQ2;

import org.distorted.library.helpers.QuatHelper;

import org.distorted.library.type.Static3D;

import org.distorted.library.type.Static4D;

import org.distorted.objectlib.main.TwistyObject;

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

// Barrel-shaped objects: map the 2D swipes of user's fingers to 3D rotations

public class TouchControlBarrel extends TouchControl

{

  private static final float MIN_LEN = 0.35f;

  private static final float[] mTmp = new float[4];

  private final Static3D[] mRotAxis;

  private final float[] mPoint, mCamera, mTouch;

  private final int[] mEnabledRotAxis;

  private final int[][][] mEnabled;

  private final float[] mMove2D;

  private final float[][] mCastedRotAxis;

  private float[][] mTouchBorders;

  private float mRadius, mHeight;

  private float mX, mY, mZ;

  private static final float X = (float)Math.sqrt( (2-SQ2)/(6+SQ2) );

  private static final float Y = (float)Math.sqrt( (2+SQ2)/(6+SQ2) );

  public static final Static3D[] FACE_AXIS = new Static3D[]

        {

          new Static3D( X, Y, Y),

          new Static3D( X,-Y, Y),

          new Static3D( Y, Y, X),

          new Static3D( Y,-Y, X),

          new Static3D( Y, Y,-X),

          new Static3D( Y,-Y,-X),

          new Static3D( X, Y,-Y),

          new Static3D( X,-Y,-Y),

          new Static3D(-X, Y,-Y),

          new Static3D(-X,-Y,-Y),

          new Static3D(-Y, Y,-X),

          new Static3D(-Y,-Y,-X),

          new Static3D(-Y, Y, X),

          new Static3D(-Y,-Y, X),

          new Static3D(-X, Y, Y),

          new Static3D(-X,-Y, Y),

        };

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

  public TouchControlBarrel(TwistyObject object)

    {

    super(object);

    int[] numLayers       = object.getNumLayers();

    float[][] cuts        = object.getCuts(numLayers);

    boolean[][] rotatable = object.getLayerRotatable(numLayers);

    float size            = object.getSize();

    mRotAxis = object.getRotationAxis();

    mEnabled = object.getEnabled();

    mMove2D  = new float[2];

    mPoint = new float[3];

    mCamera= new float[3];

    mTouch = new float[3];

    int numRotAxis = mRotAxis.length;

    mEnabledRotAxis= new int[numRotAxis+1];

    mCastedRotAxis = new float[numRotAxis][2];

    mGhostAxisEnabled = -1;

    computeBorders(cuts,rotatable,size);

    }

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

  private float[] computeBorder(float[] cuts, boolean[] rotatable, float size)

    {

    if( cuts==null ) return null;

    int len = cuts.length;

    float[] border = new float[len];

    for(int i=0; i<len; i++)

      {

      if( !rotatable[i] )

        {

        border[i] = i>0 ? border[i-1] : -Float.MAX_VALUE;

        }

      else

        {

        if( rotatable[i+1] ) border[i] = cuts[i]/size;

        else

          {

          int found = -1;

          for(int j=i+2; j<=len; j++)

            {

            if( rotatable[j] )

              {

              found=j;

              break;

              }

            }

          border[i] = found>0 ? (cuts[i]+cuts[found-1])/(2*size) : Float.MAX_VALUE;

          }

        }

      }

    return border;

    }

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

// size, not numLayers (see Master Skewb where size!=numLayers) - also cuboids.

  void computeBorders(float[][] cuts, boolean[][] rotatable, float size)

    {

    int numCuts = cuts.length;

    mTouchBorders = new float[numCuts][];

    for(int axis=0; axis<numCuts; axis++)

      {

      mTouchBorders[axis] = computeBorder(cuts[axis],rotatable[axis],size);

      }

    }

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

  private int computeRowFromOffset(int axisIndex, float offset)

    {

    float[] borders = mTouchBorders[axisIndex];

    if( borders==null ) return 0;

    int len = borders.length;

    for(int i=0; i<len; i++)

      {

      if( offset<borders[i] ) return i;

      }

    return len;

    }

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

  private float computeOffset(int rotIndex)

    {

    Static3D axis = mRotAxis[rotIndex];

    return mX*axis.get0() + mY*axis.get1() + mZ*axis.get2();

    }

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

  private void computeEnabledAxis()

    {

    if( mGhostAxisEnabled<0 )

      {

      int face = 0;//returnTouchedFace();

      int part = 0;//returnTouchedPart();

      int num = mEnabled[face][0].length;

      mEnabledRotAxis[0] = num;

      System.arraycopy(mEnabled[face][part], 0, mEnabledRotAxis, 1, num);

      }

    else

      {

      mEnabledRotAxis[0] = 1;  // if in 'ghost' mode, only one axis is enabled.

      mEnabledRotAxis[1] = mGhostAxisEnabled;

      }

    }

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

  private boolean crossesPipe(float radius, float vx, float vy, float vz)

    {

    return false;

    }

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

  private boolean crossesPlane(float nx, float ny, float nz, float d, float vx, float vy, float vz)

    {

    return false;

    }

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

  public boolean axisAndFaceAgree(int axisIndex)

    {

    return false;

    }

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

  public int getTouchedCubitFace()

    {

    return 0;

    }

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

  public float[] getTouchedPuzzleCenter()

    {

    return null;

    }

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

  public int getTouchedCubit()

    {

    return 0;

    }

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

// simply cast the appropriate rotational axis of the object to the screen surface.

  public void getCastedRotAxis(float[] output, Static4D quat, int axisIndex)

    {

    Static3D a = mRotAxis[axisIndex];

    getCastedRotAxis(output,quat,a.get0(),a.get1(),a.get2(),0);

    }

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

  public boolean objectTouched(Static4D rotatedTouchPoint, Static4D rotatedCamera)

    {

    mPoint[0]  = rotatedTouchPoint.get0()/mObjectRatio;

    mPoint[1]  = rotatedTouchPoint.get1()/mObjectRatio;

    mPoint[2]  = rotatedTouchPoint.get2()/mObjectRatio;

    mCamera[0] = rotatedCamera.get0()/mObjectRatio;

    mCamera[1] = rotatedCamera.get1()/mObjectRatio;

    mCamera[2] = rotatedCamera.get2()/mObjectRatio;

    float vx = mCamera[0]-mPoint[0];

    float vy = mCamera[1]-mPoint[1];

    float vz = mCamera[2]-mPoint[2];

    float x1=0,y1=0,z1=0;

    float x2=0,y2=0,z2=0;

    float x3=0,y3=0,z3=0;

    float len1=Float.MAX_VALUE;

    float len2=Float.MAX_VALUE;

    float len3=Float.MAX_VALUE;

    if( crossesPipe(mRadius,vx,vy,vz) )

      {

      x1 = mX;

      y1 = mY;

      z1 = mZ;

      float dx = mX-mCamera[0];

      float dy = mY-mCamera[1];

      float dz = mZ-mCamera[2];

      len1 = dx*dx + dy*dy + dz*dz;

      }

    if( crossesPlane(0,1,0,mHeight,vx,vy,vz) )

      {

      x2 = mX;

      y2 = mY;

      z2 = mZ;

      float dx = mX-mCamera[0];

      float dy = mY-mCamera[1];

      float dz = mZ-mCamera[2];

      len2 = dx*dx + dy*dy + dz*dz;

      }

    if( crossesPlane(0,-1,0,mHeight,vx,vy,vz) )

      {

      x3 = mX;

      y3 = mY;

      z3 = mZ;

      float dx = mX-mCamera[0];

      float dy = mY-mCamera[1];

      float dz = mZ-mCamera[2];

      len3 = dx*dx + dy*dy + dz*dz;

      }

    if( len1<len2 && len1<len3 )

      {

      mX = x1;

      mY = y1;

      mZ = z1;

      return true;

      }

    if( len2<len1 && len2<len3 )

      {

      mX = x2;

      mY = y2;

      mZ = z2;

      return true;

      }

    if( len3<len1 && len3<len2 )

      {

      mX = x3;

      mY = y3;

      mZ = z3;

      return true;

      }

    return false;

    }

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

  public void newRotation(int[] output, Static4D rotatedTouchPoint, Static4D quat)

    {

    computeEnabledAxis();

    mTouch[0]  = rotatedTouchPoint.get0()/mObjectRatio;

    mTouch[1]  = rotatedTouchPoint.get1()/mObjectRatio;

    mTouch[2]  = rotatedTouchPoint.get2()/mObjectRatio;

    float x = mTouch[0]-mPoint[0];

    float y = mTouch[1]-mPoint[1];

    float z = mTouch[2]-mPoint[2];

    QuatHelper.rotateVectorByQuat(mTmp,x,y,z,0,quat);

    mMove2D[0] = mTmp[0];

    mMove2D[1] = mTmp[1];

    for(int i=1; i<=mEnabledRotAxis[0]; i++)

      {

      int enabled = mEnabledRotAxis[i];

      Static3D axis = mRotAxis[enabled];

      float[] vector = mCastedRotAxis[enabled];

      float bx = axis.get0();

      float by = axis.get1();

      float bz = axis.get2();

      QuatHelper.rotateVectorByQuat(mTmp,bx,by,bz,0,quat);

      float len = (float)Math.sqrt(mTmp[0]*mTmp[0] + mTmp[1]*mTmp[1]);

      if( len<MIN_LEN )

        {

        vector[0] = 1000f;  // switch off the axis because when casted

        vector[1] = 1000f;  // onto the screen it is too short

        }

      else

        {

        vector[0] = mTmp[0]/len;

        vector[1] = mTmp[1]/len;

        }

      }

    int rotIndex = computeRotationIndex( mCastedRotAxis, mMove2D, mEnabledRotAxis);

    float offset = computeOffset(rotIndex);

    int row      = computeRowFromOffset(rotIndex,offset);

    output[0] = rotIndex;

    output[1] = row;

    }

}