Distorted Android

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

// Copyright 2016 Leszek Koltunski                                                               //

//                                                                                               //

// This file is part of Distorted.                                                               //

//                                                                                               //

// Distorted 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.                                                           //

//                                                                                               //

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

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

package org.distorted.examples.earth;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.Rect;

import android.os.Bundle;

import android.util.AttributeSet;

import android.view.MotionEvent;

import android.view.SurfaceHolder;

import android.view.SurfaceView;

import org.distorted.examples.R;

import org.distorted.library.effect.EffectName;

import java.io.IOException;

import java.io.InputStream;

import java.lang.ref.WeakReference;

import java.util.ArrayList;

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

class EarthSurfaceViewPicker extends SurfaceView implements SurfaceHolder.Callback

{

    private static final int FRAME_INTERVAL = 70;

    private static final int MULTIPLIER   = 1000;

    private static boolean refreshScreen = true;

    private GraphicsThread mThread;

    private EffectName mCurrentEffect;

    private ArrayList<Integer> mPointsX, mPointsY, mPointsE;

    private WeakReference<EarthActivity> mAct;

    private int mRadius;

    private Bitmap mBitmap;

    private Paint mPointPaint;

    private Rect mDst;

    private int mWidth, mHeight;

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

    private class GraphicsThread extends Thread

      {

      private final SurfaceHolder mSurfaceHolder;

      private final EarthSurfaceViewPicker mPicker;

      private boolean mRun = false;

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

      GraphicsThread(SurfaceHolder surfaceHolder, EarthSurfaceViewPicker p)

        {

        mSurfaceHolder = surfaceHolder;

        mPicker = p;

        }

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

      void setRunning(boolean run)

        {

        mRun = run;

        }

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

      public void run()

        {

        Canvas c;

        long time;

        while (mRun)

          {

          c = null;

          time = 0;

          if( refreshScreen )

            {

            refreshScreen=false;

            time = System.currentTimeMillis();

            try

              {

              c = mSurfaceHolder.lockCanvas(null);

              synchronized (mSurfaceHolder) { mPicker.render(c); }

              }

            finally

              {

              if (c != null)  mSurfaceHolder.unlockCanvasAndPost(c);

              }

            time = System.currentTimeMillis() -time;

            }

          if( time<FRAME_INTERVAL )

            {

            try { Thread.sleep(FRAME_INTERVAL-time); }

            catch(InterruptedException ex) {}

            }

          }

        }

      }

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

    public EarthSurfaceViewPicker(Context context, AttributeSet attrs)

      {

      super(context,attrs);

      InputStream is = context.getResources().openRawResource(R.raw.world);

      try

        {

        mBitmap = BitmapFactory.decodeStream(is);

        }

      finally

        {

        try

          {

          is.close();

          }

        catch(IOException e) { }

        }

      EarthActivity act = (EarthActivity)context;

      mAct = new WeakReference<>(act);

      mDst = new Rect();

      mPointsX = new ArrayList<>();

      mPointsY = new ArrayList<>();

      mPointsE = new ArrayList<>();

      mPointPaint = new Paint();

      mPointPaint.setARGB(255,0,0,0);

      getHolder().addCallback(this);

      }

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

    private void stopThread()

      {

      if( mThread!=null )

        {

        boolean retry = true;

        mThread.setRunning(false);

        while (retry)

          {

          try

            {

            mThread.join();

            retry = false;

            }

          catch (InterruptedException e) { android.util.Log.e( "EarthPicker", "Joining thread interrupted!"); }

          }

        mThread=null;

        }

      }

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

    void setEffectMode(EffectName effect)

      {

      mCurrentEffect = effect;

      }

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

    private void addNewPoint(int x, int y)

      {

      float xf = (float)x/mWidth;

      float yf = (float)y/mHeight;

      mPointsX.add( (int)(MULTIPLIER*xf) );

      mPointsY.add( (int)(MULTIPLIER*yf) );

      mPointsE.add(mCurrentEffect.ordinal());

      mAct.get().addNewPoint(xf,yf,mCurrentEffect);

      }

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

    void save(Bundle bundle)

      {

      bundle.putIntegerArrayList("x", mPointsX);

      bundle.putIntegerArrayList("y", mPointsY);

      bundle.putIntegerArrayList("e", mPointsE);

      }

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

    void restore(Bundle bundle)

      {

      mPointsX = bundle.getIntegerArrayList("x");

      mPointsY = bundle.getIntegerArrayList("y");

      mPointsE = bundle.getIntegerArrayList("e");

      }

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

    void clearPoints()

      {

      mPointsX.clear();

      mPointsY.clear();

      mPointsE.clear();

      refreshScreen = true;

      }

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

    private void render(Canvas c)

      {

      if( c!=null )

        {

        c.drawBitmap(mBitmap, null, mDst, null);

        int x,y,size = mPointsX.size();

        for(int point=0; point<size; point++)

          {

          x = (int)(((float)mPointsX.get(point)/MULTIPLIER)*mWidth );

          y = (int)(((float)mPointsY.get(point)/MULTIPLIER)*mHeight);

          c.drawCircle( x, y, mRadius, mPointPaint);

          }

        }

      }

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

    void onPause()

      {

      if( mThread!=null ) mThread.setRunning(false);

      }

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

    void onResume()

      {

      if( mThread!=null ) mThread.setRunning(true);

      }

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

    @Override

    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height)

      {

      mWidth = width;

      mHeight= height;

      mDst.bottom = height;

      mDst.right  = width;

      mDst.left   = 0;

      mDst.top    = 0;

      mRadius = (width+height)/60;

      refreshScreen = true;

      }

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

    @Override

    public void surfaceCreated(SurfaceHolder holder)

      {

      mThread = new GraphicsThread(getHolder(), this);

      mThread.setRunning(true);

      mThread.start();

      }

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

    @Override

    public void surfaceDestroyed(SurfaceHolder holder)

      {

      stopThread();

      }

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

    @Override

    public boolean onTouchEvent(MotionEvent event)

      {

      int action = event.getAction();

      int x = (int)event.getX();

      int y = (int)event.getY();

      switch(action)

         {

         case MotionEvent.ACTION_DOWN: addNewPoint(x,y);

                                       refreshScreen = true;

                                       break;

         }

      return true;

      }

}