CompassView.java

/*
  * This file is part of WhereYouGo.
  *
  * WhereYouGo 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 3 of the License, or
  * (at your option) any later version.
  *
  * WhereYouGo 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 WhereYouGo.  If not, see <http://www.gnu.org/licenses/>.
  *
  * Copyright (C) 2012 Menion <whereyougo@asamm.cz>
  */ 

package menion.android.whereyougo.guiding;

import menion.android.whereyougo.R;
import menion.android.whereyougo.settings.Loc;
import menion.android.whereyougo.utils.A;
import menion.android.whereyougo.utils.Images;
import menion.android.whereyougo.utils.Utils;
import menion.android.whereyougo.utils.UtilsFormat;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Typeface;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;

/**
 * @author menion
 * @since 25.1.2010 2010
 */
public class CompassView extends View {

    private float mAzimuth;
    
    /* azimuth for target arrow */
    private float mAzimuthToTarget;
    /* distance to target */
    private double mDistanceToTarget;
    
    private float cX1, cY1;
    private float r1;

    private Paint mPaintBitmap;
    
    private Paint paintValueLabel;
    private Paint paintValueDistance;
    private Paint paintValueAzimuth;
    private Paint paintValueTilt;

    private Drawable bitCompassBg;
    private Drawable bitCompassArrow;
    
    public CompassView(Context context, AttributeSet attr) {
    	super(context, attr);
    	initialize();
    }
    
	public CompassView(Context context) {
		super(context);
		initialize();
	}
	
	private void initialize() {
		mAzimuth = 0.0f;
        mAzimuthToTarget = 0.0f;
        
    	// load images
    	bitCompassBg = Images.getImageD(R.drawable.var_compass);
    	bitCompassArrow = Images.getImageD(R.drawable.var_compass_arrow);

    	// set paint methods
        mPaintBitmap = new Paint();
        mPaintBitmap.setAntiAlias(true);
        mPaintBitmap.setFilterBitmap(true);
        
        paintValueLabel = new Paint();
        paintValueLabel.setAntiAlias(true);
        paintValueLabel.setTextAlign(Align.CENTER);
        paintValueLabel.setColor(Color.WHITE);
        paintValueLabel.setTextSize(Utils.getDpPixels(12.0f));
        
        paintValueDistance = new Paint(paintValueLabel);
        paintValueAzimuth = new Paint(paintValueDistance);
        
        paintValueTilt = new Paint(paintValueDistance);
        paintValueTilt.setColor(Color.parseColor("#00a2e6"));
        paintValueTilt.setTypeface(Typeface.DEFAULT_BOLD);
        paintValueTilt.setShadowLayer(Utils.getDpPixels(3), 0, 0, Color.BLACK);
	}
	
	private int lastWidth;
	
	private void setConstants(Canvas c) {
		if (lastWidth == c.getWidth())
			return;
		
		lastWidth = c.getWidth();
		
    	// set basic constants
    	int w = c.getClipBounds().width();
    	int h = c.getClipBounds().height();
    	
    	float neededHeight = Math.min(w, h);
    	r1 = neededHeight / 2 * 0.90f;

    	cX1 = w / 2.0f;
    	cY1 = h / 2.0f;

    	// center distance text
       	paintValueDistance.setTextSize(r1 / 5);
       	paintValueAzimuth.setTextSize(r1 / 6);
       	paintValueTilt.setTextSize(r1 / 8);
	}
	
    public void draw(Canvas c) {
    	// init basic values
    	setConstants(c);

    	// draw background
    	c.save();
    	c.translate(cX1, cY1);
    	c.rotate(-mAzimuth);
    	bitCompassBg.setBounds((int) (-r1), (int) (-r1),  (int) (+r1), (int) (+r1));
    	bitCompassBg.draw(c);
    	c.restore();
    	
    	if (A.getGuidingContent().isGuiding()) {
        	c.save();
        	c.translate(cX1, cY1);
        	c.rotate(mAzimuthToTarget - mAzimuth);
        	bitCompassArrow.setBounds((int) (-r1), (int) (-r1),  (int) (+r1), (int) (+r1));
        	bitCompassArrow.draw(c);
        	c.restore();
    	}

    	// draw compass texts
        drawCompassTexts(c);
    }
	
    private void drawCompassTexts(Canvas c) {
   		float space = r1 / 20;
   		c.drawText(Loc.get(R.string.distance),
   				cX1, cY1 - paintValueDistance.getTextSize() - space, paintValueLabel);
   		c.drawText(UtilsFormat.formatDistance(mDistanceToTarget, false),
   				cX1, cY1 - space, paintValueDistance);
    		
   		c.drawText(Loc.get(R.string.azimuth),
   				cX1, cY1 + paintValueLabel.getTextSize() + space, paintValueLabel);
   		c.drawText(UtilsFormat.formatAngle(mAzimuth),
   				cX1, cY1 + paintValueLabel.getTextSize() + 
   				paintValueAzimuth.getTextSize() + space, paintValueAzimuth);
    }
    
    /**
     * Function which rotate arrow and compas (angles in degrees)
     * @param azimuth new angle for compas north
     * @param azimuthDiff new angle for arrow
     */
    public void moveAngles(float azimuthToTarget, float azimuth, float pitch, float roll) {
		this.mAzimuthToTarget = azimuthToTarget;        
		this.mAzimuth = azimuth;
        invalidate();
    }
    
    public void setDistance(double distance) {
    	this.mDistanceToTarget = distance;
    	invalidate();
    }
}