GraphableBars.java

/*
 * Copyright (C) 2011-12 asksven
 *
 * 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.
 */
package com.asksven.betterbatterystats.widgets;

import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.preference.PreferenceManager;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.ImageView;

/**
 * @author sven
 */
public class GraphableBars extends ImageView
{
    private static final String TAG = "GraphableBars";
    private Context m_context;
    
    static Paint[] sPaint = new Paint[2];
    static
    {
        sPaint[0] = new Paint();
        sPaint[0].setStyle(Paint.Style.FILL);
        sPaint[0].setColor(0xFF0080FF);
        
        sPaint[1] = new Paint();
        sPaint[1].setStyle(Paint.Style.FILL);
        sPaint[1].setColor(0xFFFF6060);
    }
    
    static Paint sBackground = new Paint();
    static
    {
        sBackground.setStyle(Paint.Style.FILL);
        sBackground.setColor(0x778B7B8B);
    }
    
    double[] mValues;
    String m_name;
    
    public GraphableBars(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        m_context = context;
    }
    
    public void setValues(double[] values, double maxValue)
    {
        mValues = values.clone();
        for (int i = 0; i < values.length; i++)
        {
//            Log.d(TAG, ">>> " + m_name + " calculating bar width: " + mValues[i] + " / " + maxValue);             
            mValues[i] = (double) ((float)mValues[i] / (float)maxValue);
//            Log.d(TAG, ">>> = " + mValues[i]);
            
        }
        // we must force onDraw by invalidating the View (see http://wing-linux.sourceforge.net/guide/topics/graphics/index.html)
        this.invalidate();
    }
    
    public void setName(String name)
    {
    	m_name = name;
    }
    
    @Override
    public void onDraw(Canvas canvas)
    {
    	// set some values for the gauge to get painted in the res editor
    	if (mValues == null)
    	{
    		mValues = new double[2];
    		mValues[0] = 0.5;
    		mValues[1] = 0.6;    		
    	}
//        Log.d(TAG, "onDraw: w = " + getWidth() + ", h = " + getHeight());
        
        int xmin = getPaddingLeft();
        int xmax = getWidth() - getPaddingRight();
        int ymin = 0;
        int ymax = getHeight();

        
        int startx = xmin;
        
        // draw bg
        canvas.drawRect(getPaddingLeft(), 0, xmax, getHeight(), sBackground);
        
        for (int i = 0; i < mValues.length; i++)
        {
            int endx = xmin + (int) (mValues[i] * (xmax - xmin));
//            Log.d(TAG, ">>>> " + m_name + " onDraw: canvas (" + startx + ", " + ymin + ", " + endx + ", " + ymax +")");
            canvas.drawRect(startx, ymin, endx, ymax, sPaint[i]);
            startx = endx;
        }
        super.onDraw(canvas);
    }
}