TwistyPuzzleLib

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

// Copyright 2020 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 org.distorted.library.helpers.QuatHelper;

import org.distorted.library.type.Static4D;

import org.distorted.objectlib.main.TwistyObject;

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

public abstract class TouchControl

  {

  // it doesn't matter where we touch a face - the list of enabled rotAxis will always be the same

  public static final int TYPE_NOT_SPLIT      = 0;

  // each face is split into several parts by lines coming from its center to the midpoints of each edge

  public static final int TYPE_SPLIT_EDGE     = 1;

  // each face is split into several parts by lines coming from its center to the vertices

  public static final int TYPE_SPLIT_CORNER   = 2;

  // each face is split into several parts by lines coming from its center to the midpoints of each edge,

  // and also it has an inscribed circle (see coin tetrahedron!)

  public static final int TYPE_SPLIT_EDGE_COIN= 3;

  static final float D_TRIANGLE = 0.95f;

  static final float D_SQUARE   = 0.75f;

  static final float D_PENTA    = 0.65f;

  public static final int TC_HEXAHEDRON        =   6;

  public static final int TC_TETRAHEDRON       =   4;

  public static final int TC_OCTAHEDRON        =   8;

  public static final int TC_DODECAHEDRON      =  12;

  public static final int TC_ICOSAHEDRON       =  20;

  public static final int TC_CUBOID            =   0;

  public static final int TC_BALL              =   1;

  public static final int TC_BARREL            =   2;

  public static final int TC_CHANGING_MIRROR   = 100;

  public static final int TC_CHANGING_SQUARE   = 101;

  public static final int TC_CHANGING_SHAPEMOD = 102;

  float mObjectRatio;

  int mGhostAxisEnabled;

  float[][] mTouchBorders;

  private final float[][] mRotationFactor;

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

  public TouchControl(TwistyObject object)

    {

    mObjectRatio = (object!=null ? object.getObjectRatio() : 1.0f);

    mRotationFactor = (object!=null ? object.returnRotationFactor() : null);

    }

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

  public void setObjectRatio(float ratio)

    {

    mObjectRatio = ratio;

    }

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

// Convert the 3D point3D into a 2D point on the same face surface, but in a different

// coordinate system: a in-plane 2D coord where the origin is in the point where the axis intersects

// the surface, and whose Y axis points 'north' i.e. is in the plane given by the 3D origin, the

// original 3D Y axis and our 2D in-plane origin.

// If those 3 points constitute a degenerate triangle which does not define a plane - which can only

// happen if axis is vertical (or in theory when 2D origin and 3D origin meet, but that would have to

// mean that the distance between the center of the Object and its faces is 0) - then we arbitrarily

// decide that 2D Y = (0,0,-1) in the North Pole and (0,0,1) in the South Pole)

// (ax,ay,az) - vector normal to the face surface.

  void convertTo2Dcoords(float[] point3D, float ax, float ay, float az , float[] output)

    {

    float y0,y1,y2; // base Y vector of the 2D coord system

    if( ax==0.0f && az==0.0f )

      {

      y0=0; y1=0; y2=-ay;

      }

    else if( ay==0.0f )

      {

      y0=0; y1=1; y2=0;

      }

    else

      {

      float norm = (float)(-ay/Math.sqrt(1-ay*ay));

      y0 = norm*ax; y1= norm*(ay-1/ay); y2=norm*az;

      }

    float x0 = y1*az - y2*ay;  //

    float x1 = y2*ax - y0*az;  // (2D coord baseY) x (axis) = 2D coord baseX

    float x2 = y0*ay - y1*ax;  //

    float originAlpha = point3D[0]*ax + point3D[1]*ay + point3D[2]*az;

    float origin0 = originAlpha*ax; // coords of the point where axis

    float origin1 = originAlpha*ay; // intersects surface plane i.e.

    float origin2 = originAlpha*az; // the origin of our 2D coord system

    float v0 = point3D[0] - origin0;

    float v1 = point3D[1] - origin1;

    float v2 = point3D[2] - origin2;

    output[0] = v0*x0 + v1*x1 + v2*x2;

    output[1] = v0*y0 + v1*y1 + v2*y2;

    }

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

// find the casted axis with which our move2D vector forms an angle closest to 90 deg.

  int computeRotationIndex(float[][] rotAxis, float[] move2D, int[] enabled)

    {

    float cosAngle, minCosAngle = Float.MAX_VALUE;

    int minIndex=0, index;

    float m0 = move2D[0];

    float m1 = move2D[1];

    int numAxis = enabled[0];

    for(int axis=1; axis<=numAxis; axis++)

      {

      index = enabled[axis];

      cosAngle = m0*rotAxis[index][0] + m1*rotAxis[index][1];

      if( cosAngle<0 ) cosAngle = -cosAngle;

      if( cosAngle<minCosAngle )

        {

        minCosAngle=cosAngle;

        minIndex = index;

        }

      }

    return minIndex;

    }

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

  public float returnRotationFactor(int axis, int row)

    {

    return mRotationFactor==null ? 1.0f : mRotationFactor[axis][row];

    }

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

  public void enableGhostAxis(int axNum, boolean enable)

    {

    mGhostAxisEnabled = enable ? -1 : axNum;

    }

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

  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);

      }

    }

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

// cast the 3D axis we are currently rotating along (which is already casted to the surface of the

// currently touched face AND converted into a 4D vector - fourth 0) to a 2D in-screen-surface axis

  void getCastedRotAxis(float[] output, Static4D quat, float x, float y, float z, float w)

    {

    Static4D result = QuatHelper.rotateVectorByQuat(x,y,z,w, quat);

    float cx = result.get0();

    float cy = result.get1();

    float len= (float)Math.sqrt(cx*cx+cy*cy);

    if( len!=0 )

      {

      output[0] = cx/len;

      output[1] = cy/len;

      }

    else

      {

      output[0] = 1;

      output[1] = 0;

      }

    }

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

  public abstract boolean objectTouched(Static4D rotatedTouchPoint, Static4D rotatedCamera);

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

  public abstract void getCastedRotAxis(float[] output, Static4D quat, int rotIndex);

  public abstract boolean axisAndFaceAgree(int rotIndex);

  public abstract int getTouchedCubitFace();

  public abstract int getTouchedCubit();

  public abstract float[] getTouchedPuzzleCenter();

  }