content: /*
   * 	   Created by Daniel Nadeau
   * 	   daniel.nadeau01@gmail.com
   * 	   danielnadeau.blogspot.com
   * 
   * 	   Licensed to the Apache Software Foundation (ASF) under one
         or more contributor license agreements.  See the NOTICE file
         distributed with this work for additional information
         regarding copyright ownership.  The ASF licenses this file
         to you 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.
   */
  
  package com.echo.holographlibrary;
  
  import android.content.Context;
  import android.graphics.*;
  import android.graphics.Path.Direction;
  import android.util.AttributeSet;
  import android.view.MotionEvent;
  import android.view.View;
  
  import java.util.ArrayList;
  
  public class PieGraph extends View {
  
  	private ArrayList<PieSlice> slices = new ArrayList<PieSlice>();
  	private Paint paint = new Paint();
  	private Path path = new Path();
  	
  	private int indexSelected = -1;
  	private int thickness = 50;
  	private OnSliceClickedListener listener;
  	
  	
  	public PieGraph(Context context) {
  		super(context);
  	}
  	public PieGraph(Context context, AttributeSet attrs) {
  		super(context, attrs);
  	}
  
      public void update() { postInvalidate(); }
  
  	public void onDraw(Canvas canvas) {
  		canvas.drawColor(Color.TRANSPARENT);
  		paint.reset();
  		paint.setAntiAlias(true);
  		float midX, midY, radius, innerRadius;
  		path.reset();
  		
  		float currentAngle = 270;
          float currentSweep;
          int totalValue = 0;
  		float padding = 2;
  		
  		midX = getWidth()/2;
  		midY = getHeight()/2;
  		if (midX < midY){
  			radius = midX;
  		} else {
  			radius = midY;
  		}
  		radius -= padding;
  		innerRadius = radius - thickness;
  		
  		for (PieSlice slice : slices){
  			totalValue += slice.getValue();
  		}
  		
  		int count = 0;
  		for (PieSlice slice : slices){
  			Path p = new Path();
  			paint.setColor(slice.getColor());
  			currentSweep = (slice.getValue()/totalValue)*(360);
  			p.arcTo(new RectF(midX-radius, midY-radius, midX+radius, midY+radius), currentAngle+padding, currentSweep - padding);
  			p.arcTo(new RectF(midX-innerRadius, midY-innerRadius, midX+innerRadius, midY+innerRadius), (currentAngle+padding) + (currentSweep - padding), -(currentSweep-padding));
  			p.close();
  			
  			slice.setPath(p);
  			slice.setRegion(new Region((int)(midX-radius), (int)(midY-radius), (int)(midX+radius), (int)(midY+radius)));
  			canvas.drawPath(p, paint);
  			
  			if (indexSelected == count && listener != null){
  				path.reset();
  				paint.setColor(slice.getColor());
  				paint.setColor(Color.parseColor("#33B5E5"));
  				paint.setAlpha(100);
  				
  				if (slices.size() > 1) {
  					path.arcTo(new RectF(midX-radius-(padding*2), midY-radius-(padding*2), midX+radius+(padding*2), midY+radius+(padding*2)), currentAngle, currentSweep+padding);
  					path.arcTo(new RectF(midX-innerRadius+(padding*2), midY-innerRadius+(padding*2), midX+innerRadius-(padding*2), midY+innerRadius-(padding*2)), currentAngle + currentSweep + padding, -(currentSweep + padding));
  					path.close();
  				} else {
  					path.addCircle(midX, midY, radius+padding, Direction.CW);
  				}
  				
  				canvas.drawPath(path, paint);
  				paint.setAlpha(255);
  			}
  
  			Bitmap icon = slice.getIcon();
  			if (icon != null) {
  				double rad = 2 * Math.PI * (currentAngle + currentSweep / 2) / 360.0;
  				double left = Math.cos(rad) * (innerRadius + radius) / 2;
  				double top = Math.sin(rad) * (innerRadius + radius) / 2;
  				canvas.drawBitmap(icon, midX - icon.getWidth() / 2 + (float)left, midY - icon.getHeight() / 2 + (float)top, null);
  			}
  
  			currentAngle = currentAngle+currentSweep;
  			
  			count++;
  		}
  		
  		
  	}
  	
  	@Override
  	public boolean onTouchEvent(MotionEvent event) {
  
  	    Point point = new Point();
  	    point.x = (int) event.getX();
  	    point.y = (int) event.getY();
  	    
  	    int count = 0;
  	    for (PieSlice slice : slices){
  	    	Region r = new Region();
  	    	r.setPath(slice.getPath(), slice.getRegion());
              if (r.contains(point.x, point.y) && event.getAction() == MotionEvent.ACTION_DOWN) {
                  indexSelected = count;
  	    	} else if (event.getAction() == MotionEvent.ACTION_UP){
                  if (r.contains(point.x, point.y) && listener != null) {
                      if (indexSelected > -1){
  		    			listener.onClick(indexSelected);
  	    			}
  	    			indexSelected = -1;
  	    		}
  	    		
  	    	}
  		    count++;
  	    }
  	    
  	    if (event.getAction() == MotionEvent.ACTION_DOWN || event.getAction() == MotionEvent.ACTION_UP){
  	    	postInvalidate();
  	    }
  	    
  	    
  
  	    return true;
  	}
  	
  	public ArrayList<PieSlice> getSlices() {
  		return slices;
  	}
  	public void setSlices(ArrayList<PieSlice> slices) {
  		this.slices = slices;
  		postInvalidate();
  	}
  	public PieSlice getSlice(int index) {
  		return slices.get(index);
  	}
  	public void addSlice(PieSlice slice) {
  		this.slices.add(slice);
  		postInvalidate();
  	}
  	public void setOnSliceClickedListener(OnSliceClickedListener listener) {
  		this.listener = listener;
  	}
  	
  	public int getThickness() {
  		return thickness;
  	}
  	public void setThickness(int thickness) {
  		this.thickness = thickness;
  		postInvalidate();
  	}
  	
  	public void removeSlices(){
  		for (int i = slices.size()-1; i >= 0; i--){
  			slices.remove(i);
  		}
  		postInvalidate();
  	}
  
  	public static interface OnSliceClickedListener {
  		public abstract void onClick(int index);
  	}
  
  }
  