Distorted Android

        <activity android:name=".projection.ProjectionActivity" />

import org.distorted.examples.projection.ProjectionActivity;

      item.put(ITEM_IMAGE, R.drawable.icon_example_projection);

      item.put(ITEM_TITLE, (i+1)+". "+getText(R.string.example_projection));

      item.put(ITEM_SUBTITLE, getText(R.string.example_projection_subtitle));

      activityMapping.put(i++, ProjectionActivity.class);

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

// 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.projection;

import org.distorted.library.Distorted;

import org.distorted.examples.R;

import android.app.Activity;

import android.opengl.GLSurfaceView;

import android.os.Bundle;

import android.widget.SeekBar;

import android.widget.TextView;

import android.widget.SeekBar.OnSeekBarChangeListener;

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

public class ProjectionActivity extends Activity implements OnSeekBarChangeListener

{

    private TextView textF, textX, textY;

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

    @Override

    protected void onCreate(Bundle icicle) 

      {

      super.onCreate(icicle);

      setContentView(R.layout.projectionlayout);

      textF = (TextView)findViewById(R.id.projectionTextFOV);

      textX = (TextView)findViewById(R.id.projectionTextX);

      textY = (TextView)findViewById(R.id.projectionTextY);

      SeekBar bar;

      bar = (SeekBar)findViewById(R.id.projectionSeekFOV);

      bar.setOnSeekBarChangeListener(this);

      bar.setProgress(50);

      bar = (SeekBar)findViewById(R.id.projectionSeekX);

      bar.setOnSeekBarChangeListener(this);

      bar.setProgress(50);

      bar = (SeekBar)findViewById(R.id.projectionSeekY);

      bar.setOnSeekBarChangeListener(this);

      bar.setProgress(50);

      }

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

    @Override

    protected void onPause() 

      {

      GLSurfaceView mView = (GLSurfaceView) this.findViewById(R.id.surfaceViewProjection);

      mView.onPause();

      super.onPause();

      }

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

    @Override

    protected void onResume() 

      {

      super.onResume();

      GLSurfaceView mView = (GLSurfaceView) this.findViewById(R.id.surfaceViewProjection);

      mView.onResume();    

      }

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

    @Override

    protected void onDestroy() 

      {

      Distorted.onDestroy();  

      super.onDestroy();

      }

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

    public void onProgressChanged(SeekBar bar, int progress, boolean fromUser) 

      {

      int ret;

      switch (bar.getId()) 

        {

        case R.id.projectionSeekFOV: ret = ProjectionRenderer.setFOV(progress);

                                     textF.setText("FOV: "+ret);

                                     break;

        case R.id.projectionSeekX  : ret = ProjectionRenderer.setX(progress);

                                     textX.setText("X: "+ret);

                                     break;

        case R.id.projectionSeekY  : ret = ProjectionRenderer.setY(progress);

                                     textY.setText("Y: "+ret);

                                     break;

        }

      }

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

    public void onStartTrackingTouch(SeekBar bar) { }

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

    public void onStopTrackingTouch(SeekBar bar)  { }

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

}

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

// 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.projection;

import javax.microedition.khronos.egl.EGLConfig;

import javax.microedition.khronos.opengles.GL10;

import org.distorted.library.Distorted;

import org.distorted.library.DistortedBitmap;

import org.distorted.library.type.Static3D;

import org.distorted.library.type.Static4D;

import android.graphics.Bitmap;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.opengl.GLES20;

import android.opengl.GLSurfaceView;

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

class ProjectionRenderer implements GLSurfaceView.Renderer

{

   private GLSurfaceView mView;

   private DistortedBitmap mProjection;

   private static float mF, mX, mY;

   private static int mWidth, mHeight;

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

   ProjectionRenderer(GLSurfaceView view)

      { 

      mView = view;

      }

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

   static int setFOV(int f)

      {

      mF = f;

      Distorted.setProjection(mF,mX,mY);

      return (int)mF;

      }

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

   static int setX(int x)

      {

      mX = (x-50)*0.01f*mWidth;

      Distorted.setProjection(mF,mX,mY);

      return (int)mX;

      }

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

   static int setY(int y)

      {

      mY = (y-50)*0.01f*mHeight;

      Distorted.setProjection(mF,mX,mY);

      return (int)mY;

      }

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

   public void onDrawFrame(GL10 glUnused) 

      {

      GLES20.glClear( GLES20.GL_DEPTH_BUFFER_BIT | GLES20.GL_COLOR_BUFFER_BIT);

      mProjection.draw(System.currentTimeMillis());

      }

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

   public void onSurfaceChanged(GL10 glUnused, int width, int height) 

      {

      mWidth = width;

      mHeight= height;

      Distorted.onSurfaceChanged(width, height);

      setupBitmap(width,height);

      }

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

   public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {

      GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);

      try

        {

        Distorted.onSurfaceCreated(mView.getContext());

        }

      catch(Exception ex)

        {

        android.util.Log.e("Projection", ex.getMessage() );

        }

      }

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

    private void setupBitmap(int w, int h)

      {

      Paint paint = new Paint();

      mProjection = new DistortedBitmap(w,h, 50);

      Bitmap bmp = Bitmap.createBitmap(w,h, Bitmap.Config.ARGB_8888);

      Canvas bmpCanvas = new Canvas(bmp);

      paint.setColor(0xff008800);

      paint.setStyle(Style.FILL);

      bmpCanvas.drawRect(0, 0, w, h, paint);

      paint.setColor(0xffffffff);

      final int NUMLINES = 10;

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

        {

        bmpCanvas.drawRect(w*i/NUMLINES - 1,                0,  w*i/NUMLINES + 1,  h               , paint);

        bmpCanvas.drawRect(               0, h *i/NUMLINES -1,  w               ,  h*i/NUMLINES + 1, paint);

        }

      mProjection.setBitmap(bmp);

      int min = w<h ? w:h;

      Static3D vector = new Static3D(0,0,min/5);

      Static4D region = new Static4D(0,0,min/5,min/5);

      mProjection.distort(vector, new Static3D(  w/4,   h/4, 0), region);

      mProjection.distort(vector, new Static3D(3*w/4,   h/4, 0), region);

      mProjection.distort(vector, new Static3D(  w/4, 3*h/4, 0), region);

      mProjection.distort(vector, new Static3D(3*w/4, 3*h/4, 0), region);

      }

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

}

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

// 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.projection;

import android.content.Context;

import android.opengl.GLSurfaceView;

import android.util.AttributeSet;

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

class ProjectionSurfaceView extends GLSurfaceView

{

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

    public ProjectionSurfaceView(Context c, AttributeSet attrs)

      {

      super(c, attrs);

      if(!isInEditMode())

        {

        setEGLContextClientVersion(2);

        setRenderer(new ProjectionRenderer(this));

        }

      }

}

    Distorted.setProjection(60.0f, 0.0f, 0.0f);

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <org.distorted.examples.projection.ProjectionSurfaceView

        android:id="@+id/surfaceViewProjection"

        android:layout_width="fill_parent"

        android:layout_height="0dp"

        android:layout_weight="1" />

    <LinearLayout

        android:id="@+id/linearLayout1"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:gravity="center|fill_horizontal"

        android:orientation="horizontal"

        android:paddingBottom="5dp"

        android:paddingTop="5dp" >

        <TextView

            android:id="@+id/projectionTextFOV"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="0.5"

            android:paddingStart="15dp"

            android:textAppearance="?android:attr/textAppearanceMedium" />

        <SeekBar

            android:id="@+id/projectionSeekFOV"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:paddingStart="15dp"

            android:paddingEnd="15dp" />

    </LinearLayout>

    <LinearLayout

        android:id="@+id/linearLayout2"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:gravity="center|fill_horizontal"

        android:orientation="horizontal"

        android:paddingBottom="5dp"

        android:paddingTop="5dp" >

        <TextView

            android:id="@+id/projectionTextX"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="0.5"

            android:paddingStart="15dp"

            android:textAppearance="?android:attr/textAppearanceMedium" />

        <SeekBar

            android:id="@+id/projectionSeekX"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:paddingStart="15dp"

            android:paddingEnd="15dp" />

    </LinearLayout>

    <LinearLayout

        android:id="@+id/linearLayout3"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:gravity="center|fill_horizontal"

        android:orientation="horizontal"

        android:paddingBottom="5dp"

        android:paddingTop="5dp" >

        <TextView

            android:id="@+id/projectionTextY"

            android:layout_width="0dp"

            android:layout_height="wrap_content"

            android:layout_weight="0.5"

            android:paddingStart="15dp"

            android:textAppearance="?android:attr/textAppearanceMedium" />

        <SeekBar

            android:id="@+id/projectionSeekY"

            android:layout_width="wrap_content"

            android:layout_height="wrap_content"

            android:layout_weight="1"

            android:paddingStart="15dp"

            android:paddingEnd="15dp" />

    </LinearLayout>

</LinearLayout>

    <string name="example_projection">Projection</string>

    <string name="example_projection_subtitle">Adjust the Projection Matrix.</string>