Interfuser

/*
 * Copyright (C) 2010 Neil Davies
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * This code is base on the Android Gallery widget and was Created 
 * by Neil Davies neild001 'at' gmail dot com to be a Coverflow widget
 * 
 * @author Neil Davies
 */
package com.example.coverflow;


import android.content.Context;
import android.graphics.Camera;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.view.View;
import android.view.animation.Transformation;
import android.widget.Gallery;
import android.widget.ImageView;

public class CoverFlow extends Gallery {

    /**
     * Graphics Camera used for transforming the matrix of ImageViews
     */
    private Camera mCamera = new Camera();

    /**
     * The maximum angle the Child ImageView will be rotated by
     */    
    private int mMaxRotationAngle = 60;
    
    /**
     * The maximum zoom on the centre Child
     */
    private int mMaxZoom = -120;
    
    /**
     * The Centre of the Coverflow 
     */   
    private int mCoveflowCenter;
   
 public CoverFlow(Context context) {
  super(context);
  this.setStaticTransformationsEnabled(true);
 }

 public CoverFlow(Context context, AttributeSet attrs) {
  super(context, attrs);
        this.setStaticTransformationsEnabled(true);
 }
 
  public CoverFlow(Context context, AttributeSet attrs, int defStyle) {
   super(context, attrs, defStyle);
   this.setStaticTransformationsEnabled(true);   
  }
  
    /**
     * Get the max rotational angle of the image
  * @return the mMaxRotationAngle
  */
 public int getMaxRotationAngle() {
  return mMaxRotationAngle;
 }

 /**
  * Set the max rotational angle of each image
  * @param maxRotationAngle the mMaxRotationAngle to set
  */
 public void setMaxRotationAngle(int maxRotationAngle) {
  mMaxRotationAngle = maxRotationAngle;
 }

 /**
  * Get the Max zoom of the centre image
  * @return the mMaxZoom
  */
 public int getMaxZoom() {
  return mMaxZoom;
 }

 /**
  * Set the max zoom of the centre image
  * @param maxZoom the mMaxZoom to set
  */
 public void setMaxZoom(int maxZoom) {
  mMaxZoom = maxZoom;
 }

 /**
     * Get the Centre of the Coverflow
     * @return The centre of this Coverflow.
     */
    private int getCenterOfCoverflow() {
        return (getWidth() - getPaddingLeft() - getPaddingRight()) / 2 + getPaddingLeft();
    }
    
    /**
     * Get the Centre of the View
     * @return The centre of the given view.
     */
    private static int getCenterOfView(View view) {
        return view.getLeft() + view.getWidth() / 2;
    }  
    /**
  * {@inheritDoc}
  *
  * @see #setStaticTransformationsEnabled(boolean) 
  */ 
    protected boolean getChildStaticTransformation(View child, Transformation t) {
  
  final int childCenter = getCenterOfView(child);
  final int childWidth = child.getWidth() ;
  int rotationAngle = 0;
  
  t.clear();
  t.setTransformationType(Transformation.TYPE_MATRIX);
  
        if (childCenter == mCoveflowCenter) {
            transformImageBitmap((ImageView) child, t, 0);
        } else {      
            rotationAngle = (int) (((float) (mCoveflowCenter - childCenter)/ childWidth) *  mMaxRotationAngle);
            if (Math.abs(rotationAngle) > mMaxRotationAngle) {
             rotationAngle = (rotationAngle < 0) ? -mMaxRotationAngle : mMaxRotationAngle;   
            }
            transformImageBitmap((ImageView) child, t, rotationAngle);         
        }    
             
  return true;
 }

 /**
  * This is called during layout when the size of this view has changed. If
  * you were just added to the view hierarchy, you're called with the old
  * values of 0.
  *
  * @param w Current width of this view.
  * @param h Current height of this view.
  * @param oldw Old width of this view.
  * @param oldh Old height of this view.
     */
     protected void onSizeChanged(int w, int h, int oldw, int oldh) {
      mCoveflowCenter = getCenterOfCoverflow();
      super.onSizeChanged(w, h, oldw, oldh);
     }
  
     /**
      * Transform the Image Bitmap by the Angle passed 
      * 
      * @param imageView ImageView the ImageView whose bitmap we want to rotate
      * @param t transformation 
      * @param rotationAngle the Angle by which to rotate the Bitmap
      */
     private void transformImageBitmap(ImageView child, Transformation t, int rotationAngle) {            
      mCamera.save();
      final Matrix imageMatrix = t.getMatrix();;
      final int imageHeight = child.getLayoutParams().height;;
      final int imageWidth = child.getLayoutParams().width;
      final int rotation = Math.abs(rotationAngle);
                     
      mCamera.translate(0.0f, 0.0f, 100.0f);
         
      //As the angle of the view gets less, zoom in     
      if ( rotation < mMaxRotationAngle ) {
       float zoomAmount = (float) (mMaxZoom +  (rotation * 1.5));
       mCamera.translate(0.0f, 0.0f, zoomAmount);          
      } 
      
      mCamera.rotateY(rotationAngle);
      mCamera.getMatrix(imageMatrix);               
      imageMatrix.preTranslate(-(imageWidth/2), -(imageHeight/2)); 
      imageMatrix.postTranslate((imageWidth/2), (imageHeight/2));
      mCamera.restore();
 }
}

/*
 * Copyright (C) 2010 Neil Davies
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * This code is base on the Android Gallery widget and was Created 
 * by Neil Davies neild001 'at' gmail dot com to be a Coverflow widget
 * 
 * @author Neil Davies
 */
package com.example.coverflow;

import java.io.FileInputStream;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.LinearGradient;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.PorterDuffXfermode;
import android.graphics.Bitmap.Config;
import android.graphics.PorterDuff.Mode;
import android.graphics.Shader.TileMode;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ImageView.ScaleType;

public class CoverFlowExample extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     
     CoverFlow coverFlow;
     coverFlow = new CoverFlow(this);
     
     coverFlow.setAdapter(new ImageAdapter(this));

     ImageAdapter coverImageAdapter =  new ImageAdapter(this);
     
     //coverImageAdapter.createReflectedImages();
     
     coverFlow.setAdapter(coverImageAdapter);
     
     coverFlow.setSpacing(-25);
     coverFlow.setSelection(4, true);
     coverFlow.setAnimationDuration(1000);
     
     
     setContentView(coverFlow);
    }
    
 public class ImageAdapter extends BaseAdapter {
     int mGalleryItemBackground;
     private Context mContext;

     private FileInputStream fis;
        
     private Integer[] mImageIds = {
       R.drawable.kasabian_kasabian,
             R.drawable.starssailor_silence_is_easy,
             R.drawable.killers_day_and_age,
             R.drawable.garbage_bleed_like_me,
             R.drawable.death_cub_for_cutie_the_photo_album,
             R.drawable.kasabian_kasabian,
             R.drawable.massive_attack_collected,
             R.drawable.muse_the_resistance,
             R.drawable.starssailor_silence_is_easy
     };

     private ImageView[] mImages;
     
     public ImageAdapter(Context c) {
      mContext = c;
      mImages = new ImageView[mImageIds.length];
     }
  public boolean createReflectedImages() {
          //The gap we want between the reflection and the original image
          final int reflectionGap = 4;
          
          
          int index = 0;
          for (int imageId : mImageIds) {
        Bitmap originalImage = BitmapFactory.decodeResource(getResources(), 
          imageId);
           int width = originalImage.getWidth();
           int height = originalImage.getHeight();
           
     
           //This will not scale but will flip on the Y axis
           Matrix matrix = new Matrix();
           matrix.preScale(1, -1);
           
           //Create a Bitmap with the flip matrix applied to it.
           //We only want the bottom half of the image
           Bitmap reflectionImage = Bitmap.createBitmap(originalImage, 0, height/2, width, height/2, matrix, false);
           
               
           //Create a new bitmap with same width but taller to fit reflection
           Bitmap bitmapWithReflection = Bitmap.createBitmap(width 
             , (height + height/2), Config.ARGB_8888);
         
          //Create a new Canvas with the bitmap that's big enough for
          //the image plus gap plus reflection
          Canvas canvas = new Canvas(bitmapWithReflection);
          //Draw in the original image
          canvas.drawBitmap(originalImage, 0, 0, null);
          //Draw in the gap
          Paint deafaultPaint = new Paint();
          canvas.drawRect(0, height, width, height + reflectionGap, deafaultPaint);
          //Draw in the reflection
          canvas.drawBitmap(reflectionImage,0, height + reflectionGap, null);
          
          //Create a shader that is a linear gradient that covers the reflection
          Paint paint = new Paint(); 
          LinearGradient shader = new LinearGradient(0, originalImage.getHeight(), 0, 
            bitmapWithReflection.getHeight() + reflectionGap, 0x70ffffff, 0x00ffffff, 
            TileMode.CLAMP); 
          //Set the paint to use this shader (linear gradient)
          paint.setShader(shader); 
          //Set the Transfer mode to be porter duff and destination in
          paint.setXfermode(new PorterDuffXfermode(Mode.DST_IN)); 
          //Draw a rectangle using the paint with our linear gradient
          canvas.drawRect(0, height, width, 
            bitmapWithReflection.getHeight() + reflectionGap, paint); 
          
          ImageView imageView = new ImageView(mContext);
          imageView.setImageBitmap(bitmapWithReflection);
          imageView.setLayoutParams(new CoverFlow.LayoutParams(120, 180));
          imageView.setScaleType(ScaleType.MATRIX);
          mImages[index++] = imageView;
          
          }
       return true;
  }

     public int getCount() {
         return mImageIds.length;
     }

     public Object getItem(int position) {
         return position;
     }

     public long getItemId(int position) {
         return position;
     }

     public View getView(int position, View convertView, ViewGroup parent) {

      //Use this code if you want to load from resources
         ImageView i = new ImageView(mContext);
         i.setImageResource(mImageIds[position]);
         i.setLayoutParams(new CoverFlow.LayoutParams(130, 130));
         i.setScaleType(ImageView.ScaleType.CENTER_INSIDE); 
         
         //Make sure we set anti-aliasing otherwise we get jaggies
         BitmapDrawable drawable = (BitmapDrawable) i.getDrawable();
         drawable.setAntiAlias(true);
         return i;
      
      //return mImages[position];
     }
   /** Returns the size (0.0f to 1.0f) of the views 
      * depending on the 'offset' to the center. */ 
      public float getScale(boolean focused, int offset) { 
        /* Formula: 1 / (2 ^ offset) */ 
          return Math.max(0, 1.0f / (float)Math.pow(2, Math.abs(offset))); 
      } 

 }
}