Magic Cube

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

// Copyright 2019 Leszek Koltunski                                                               //

//                                                                                               //

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

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

//                                                                                               //

// 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                             //

package org.distorted.magic;

import android.app.ActivityManager;

import android.content.Context;

import android.content.pm.ConfigurationInfo;

import android.graphics.drawable.Drawable;

import android.widget.Button;

import android.widget.ImageButton;

import android.widget.LinearLayout;

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

    // given face by SWIPING_SENSITIVITY/2 degrees.

    private final static int SWIPING_SENSITIVITY  = 240;

    private final static int DIRECTION_SENSITIVITY=  12;

    private RubikCubeMovement mMovement;

    private boolean mInScrambleMode;

    private static Static4D mQuatAccumulated= new Static4D(-0.25189602f,0.3546389f,0.009657208f,0.90038127f);

    private static Static4D mTempCurrent    = new Static4D(0,0,0,1);

    private static Static4D mTempAccumulated= new Static4D(0,0,0,1);

    void setScreenSize(int width, int height)

      {

      mScreenWidth = width;

      mScreenHeight= height;

      mScreenMin = width<height ? width:height;

      }

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

    RubikRenderer getRenderer()

      {

      return mRenderer;

      }

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

    static int getRedButton()

      {

      return mButton;

      }

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

    void setQuatAccumulated()

      {

      mQuatAccumulated.set(mTempAccumulated);

      }

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

    void setQuatCurrent()

      {

      mQuatCurrent.set(mTempCurrent);

      }

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

    Static4D getQuatAccumulated()

      {

      return mQuatAccumulated;

      }

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

    Static4D getQuatCurrent()

      {

      return mQuatCurrent;

      }

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

    private Static4D quatFromDrag(float dragX, float dragY)

      {

      float axisX = dragY;  // inverted X and Y - rotation axis is perpendicular to (dragX,dragY)

      float axisY = dragX;  // Why not (-dragY, dragX) ? because Y axis is also inverted!

      float axisZ = 0;

      float axisL = (float)Math.sqrt(axisX*axisX + axisY*axisY + axisZ*axisZ);

      if( axisL>0 )

        {

        axisX /= axisL;

        axisY /= axisL;

        axisZ /= axisL;

        float ratio = axisL;

        ratio = ratio - (int)ratio;     // the cos() is only valid in (0,Pi)

        float cosA = (float)Math.cos(Math.PI*ratio);

        float sinA = (float)Math.sqrt(1-cosA*cosA);

        return new Static4D(axisX*sinA, axisY*sinA, axisZ*sinA, cosA);

        }

      return new Static4D(0f, 0f, 0f, 1f);

      }

      float qy = quat1.get1();

      float qz = quat1.get2();

      float qw = quat1.get3();

      float ry = quat2.get1();

      float rz = quat2.get2();

      float rw = quat2.get3();

      float ty = rw*qy + rz*qx + ry*qw - rx*qz;

      float tz = rw*qz + rz*qw - ry*qx + rx*qy;

      float tw = rw*qw - rz*qz - ry*qy - rx*qx;

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

      float qy = quat.get1();

      float qz = quat.get2();

      float qw = quat.get3();

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

      float qy = quat.get1();

      float qz = quat.get2();

      float qw = quat.get3();

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

      RubikActivity act = (RubikActivity)getContext();

          {

          d.setColorFilter(ContextCompat.getColor(act,R.color.red), PorterDuff.Mode.MULTIPLY);

          }

        else

          {

          d.clearColorFilter();

          }

      }

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

      DisplayMetrics metrics = getResources().getDisplayMetrics();

      float scale = metrics.density;

      int size = (int)(64*scale +0.5f);

      int padding = (int)(3*scale + 0.5f);

      ViewGroup.LayoutParams params = new ViewGroup.LayoutParams(size,size);

      for(int i=0; i<RubikSize.LENGTH; i++)

        {

        ImageButton button = new ImageButton(act);

        button.setLayoutParams(params);

        button.setId(i);

        button.setPadding(padding,0,padding,0);

        int iconID = RubikSize.getSize(i).getIconID();

        button.setImageResource(iconID);

        button.setOnClickListener(act);

        layout.addView(button);

        }

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

        {

        mInScrambleMode = true;

          {

          scrambleButt.setClickable(false);

          scrambleButt.setVisibility(INVISIBLE);

          }

        else

          {

          android.util.Log.e("view", "button null!");

          }

        }

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

        {

        mInScrambleMode = false;

          {

          scrambleButt.setClickable(true);

          scrambleButt.setVisibility(VISIBLE);

          }

        else

          {

          android.util.Log.e("view", "button null!");

          }

      }

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

        public void run()

          {

          leaveScrambleMode();

          }

        });

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

// PUBLIC API

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

    public RubikSurfaceView(Context context, AttributeSet attrs)

      {

      super(context,attrs);

      if(!isInEditMode())

        {

        final ActivityManager activityManager     = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);

        final ConfigurationInfo configurationInfo = activityManager.getDeviceConfigurationInfo();

        setEGLContextClientVersion( (configurationInfo.reqGlEsVersion>>16) >= 3 ? 3:2 );

        setRenderer(mRenderer);

        }

      }

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

    @Override

    public boolean onTouchEvent(MotionEvent event)

      {

      int action = event.getAction();

      float y = (mScreenHeight*0.5f -event.getY())/mScreenMin;

      switch(action)

         {

         case MotionEvent.ACTION_DOWN: mX = x;

                                       mY = y;

                                       Static4D rotatedTouchPoint1= rotateVectorByInvertedQuat(touchPoint1, mQuatAccumulated);

                                       Static4D rotatedCamera= rotateVectorByInvertedQuat(CAMERA_POINT, mQuatAccumulated);

                                       if( mMovement.faceTouched(rotatedTouchPoint1, rotatedCamera) )

                                         mDragging           = false;

                                         mBeginningRotation  = mRenderer.canRotate();

                                         mContinuingRotation = false;

                                         }

                                       else

                                         {

                                         mDragging           = mRenderer.canDrag();

                                         mBeginningRotation  = false;

                                         mContinuingRotation = false;

                                         }

                                       break;

         case MotionEvent.ACTION_MOVE: if( mDragging )

                                         {

                                           mX = x;

                                           mY = y;

                                           mTempAccumulated.set(quatMultiply(mQuatCurrent, mQuatAccumulated));

                                           mTempCurrent.set(0f, 0f, 0f, 1f);

                                           mRenderer.setQuatCurrentOnNextRender();

                                           mRenderer.setQuatAccumulatedOnNextRender();

                                           }

                                         }

                                       if( mBeginningRotation )

                                         {

                                           Static4D rotatedTouchPoint2= rotateVectorByInvertedQuat(touchPoint2, mQuatAccumulated);

                                           Static2D rot = mMovement.newRotation(rotatedTouchPoint2);

                                           mContinuingRotation= true;

                                           }

                                         }

                                       else if( mContinuingRotation )

                                         {

                                         Static4D rotatedTouchPoint3= rotateVectorByInvertedQuat(touchPoint3, mQuatAccumulated);

                                         float angle = mMovement.continueRotation(rotatedTouchPoint3);

                                       break;

         case MotionEvent.ACTION_UP  : if( mDragging )

                                         {

                                         mTempAccumulated.set(quatMultiply(mQuatCurrent, mQuatAccumulated));

                                         mTempCurrent.set(0f, 0f, 0f, 1f);

                                         mRenderer.setQuatCurrentOnNextRender();

                                         mRenderer.setQuatAccumulatedOnNextRender();

                                         }

                                       if( mContinuingRotation )

                                         {

                                       break;

         }

      return true;

      }