Magic Cube

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

// Copyright 2020 Leszek Koltunski                                                               //

//                                                                                               //

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

//                                                                                               //

// Magic Cube 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.                                                           //

//                                                                                               //

// Magic Cube 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 Magic Cube.  If not, see <http://www.gnu.org/licenses/>.                           //

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

package org.distorted.object;

import org.distorted.library.type.Static2D;

import org.distorted.library.type.Static4D;

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

public abstract class RubikObjectMovement

  {

  float[] mPoint, mCamera, mTouch;

  int mRotationVect, mLastTouchedAxis;

  private float[] mDiff;

  private int mLastTouchedLR;

  private int mNumAxis, mNumFacesPerAxis;

  private int[] mPossible;

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

  abstract boolean faceIsVisible(int axis, int lr);

  abstract void castTouchPointOntoFace(int axis, int lr, float[] output);

  abstract boolean isInsideFace(float[] point);

  abstract void fillPossibleRotations(int axis, int[] output);

  abstract float fillUpRotationVectAndOffset(float[] vect, int[] possible);

  abstract float returnAngle(float[] vect, int[] possible);

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

  RubikObjectMovement(int numAxis, int numFacesPerAxis)

    {

    mPoint = new float[3];

    mCamera= new float[3];

    mDiff  = new float[3];

    mTouch = new float[3];

    mNumAxis = numAxis;

    mNumFacesPerAxis = numFacesPerAxis;

    mPossible = new int[mNumAxis-1];

    }

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

// PUBLIC API

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

  public boolean faceTouched(Static4D rotatedTouchPoint, Static4D rotatedCamera)

    {

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

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

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

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

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

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

    for( mLastTouchedAxis=0; mLastTouchedAxis<mNumAxis; mLastTouchedAxis++)

      {

      for( mLastTouchedLR=0; mLastTouchedLR<mNumFacesPerAxis; mLastTouchedLR++)

        {

        if( faceIsVisible(mLastTouchedAxis, mLastTouchedLR) )

          {

          castTouchPointOntoFace(mLastTouchedAxis, mLastTouchedLR, mTouch);

          if( isInsideFace(mTouch) )

            {

            fillPossibleRotations(mLastTouchedAxis, mPossible);

            return true;

            }

          }

        }

      }

    return false;

    }

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

  public Static2D newRotation(Static4D rotatedTouchPoint)

    {

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

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

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

    castTouchPointOntoFace(mLastTouchedAxis, mLastTouchedLR, mDiff);

    mDiff[0] -= mTouch[0];

    mDiff[1] -= mTouch[1];

    mDiff[2] -= mTouch[2];

    float offset = fillUpRotationVectAndOffset(mDiff, mPossible);

    mTouch[0] = mPoint[0];

    mTouch[1] = mPoint[1];

    mTouch[2] = mPoint[2];

    return new Static2D(mRotationVect,offset);

    }

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

  public float continueRotation(Static4D rotatedTouchPoint)

    {

    mDiff[0] = rotatedTouchPoint.get0()/RubikObject.OBJECT_SCREEN_RATIO - mTouch[0];

    mDiff[1] = rotatedTouchPoint.get1()/RubikObject.OBJECT_SCREEN_RATIO - mTouch[1];

    mDiff[2] = rotatedTouchPoint.get2()/RubikObject.OBJECT_SCREEN_RATIO - mTouch[2];

    return (mLastTouchedLR-0.5f)*returnAngle(mDiff, mPossible);

    }

  }