Distorted Android

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// 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.GridFlat;

import org.distorted.library.DistortedObject;

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 DistortedObject mProjection;

   private GridFlat mGrid;

   private static float mF, mX, mY;

   private static int mWidth, mHeight;

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

   ProjectionRenderer(GLSurfaceView view)

      { 

      mView = view;

      }

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   static int setFOV(int f)

      {

      mF = f;

      Distorted.setProjection(mF,mX,mY);

      return (int)mF;

      }

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

   static int setX(int x)

      {

      mX = (x-50)*0.02f*mWidth;

      Distorted.setProjection(mF,mX,mY);

      return (int)mX;

      }

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

   static int setY(int y)

      {

      mY = (y-50)*0.02f*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(), mGrid);

      }

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

   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 DistortedObject(w,h,1);

      mGrid       = new GridFlat(50,50*h/w);

      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.setTexture(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);

      }

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

}