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/>.                            //

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package org.distorted.examples.fov;

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.Float2D;

import org.distorted.library.type.Float3D;

import org.distorted.library.type.Float4D;

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;

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class FOVRenderer implements GLSurfaceView.Renderer 

{

   private static final int NUMLINES = 10;

   private GLSurfaceView mView;

   private DistortedBitmap fov;

   private Paint mPaint;

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   public FOVRenderer(GLSurfaceView view) 

      { 

      mView = view;

      }

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   public static void setFOV(int fov)

      {

      Distorted.setFov(fov);

      }

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   public void onDrawFrame(GL10 glUnused) 

      {

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

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

      fov.draw(System.currentTimeMillis());

      }

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

      { 

      Distorted.onSurfaceChanged(width, height);

      setupBitmap(width,height);

      }

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   public void onSurfaceCreated(GL10 glUnused, EGLConfig config) 

      {  

      try

        {

        Distorted.onSurfaceCreated(mView.getContext());

        }

      catch(Exception ex)

        {

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

        }

      }

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    private void setupBitmap(int w, int h)

      {

      mPaint = new Paint();

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

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

      Canvas fovCanvas = new Canvas(fovBitmap);    

      mPaint.setColor(0xff008800);

      mPaint.setStyle(Style.FILL);

      fovCanvas.drawRect(0, 0, w, h, mPaint);

      mPaint.setColor(0xffffffff);

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

        {

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

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

        }

      fov.setBitmap(fovBitmap);

      int min = w<h ? w:h;

      Float3D dp3D = new Float3D(0,0,min/5);

      Float4D dr = new Float4D(0,0,min/5,min/5);

      Float2D point1 = new Float2D(  w/4,   h/4);

      Float2D point2 = new Float2D(3*w/4,   h/4);

      Float2D point3 = new Float2D(  w/4, 3*h/4);

      Float2D point4 = new Float2D(3*w/4, 3*h/4);

      fov.distort(dp3D, dr, point1, 0, 0.5f);

      fov.distort(dp3D, dr, point2, 0, 0.5f);

      fov.distort(dp3D, dr, point3, 0, 0.5f);

      fov.distort(dp3D, dr, point4, 0, 0.5f);

      }

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}