CompassView.java :  » UnTagged » smartshop-project » com » appspot » smartshop » map » Android Open Source

package com.appspot.smartshop.map;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.util.AttributeSet;
import android.util.Config;
import android.util.Log;
import android.view.View;

import com.appspot.smartshop.R;
import com.appspot.smartshop.utils.Global;

public class CompassView  extends View {
  public static final String TAG = "[CompassView]";
  
  private Paint   mPaint = new Paint();
    private Path    mPath = new Path();
    private boolean mAnimate;
    private long    mNextTime;
    
    public float x1 = 1.1f;
    public float y1 = 1.1f;
    public float x2 = 100.2f;
    public float y2 = 100f;
    
    private CompassView mView;
    private float[] mValues;
    
    Bitmap bmp = BitmapFactory.decodeResource(
      Global.application.getResources(), R.drawable.compass_arrow);
    
    private SensorListener mListener = new SensorListener() {
    
        public void onSensorChanged(int sensor, float[] values) {
//            if (Config.LOGD) Log.d(TAG, "sensorChanged (" + values[0] + ", " + values[1] + ", " + values[2] + ")");
            mValues = values;
            if (mView != null) {
                mView.invalidate();
            }
        }

        public void onAccuracyChanged(int sensor, int accuracy) {
        }
    };

    private int backgroundColor = Global.application.getResources().getColor(R.color.background);
    public CompassView(Context context, AttributeSet attrs) {
    super(context, attrs);
    Global.mSensorManager.registerListener(mListener, 
            SensorManager.SENSOR_ORIENTATION,
            SensorManager.SENSOR_DELAY_GAME);
    mView = this;
    }

    boolean first = true;
    public static final int SIZE = 30;
    @Override protected void onDraw(Canvas canvas) {
        mPaint.setAntiAlias(true);
        mPaint.setStyle(Paint.Style.FILL);

        int cx = SIZE / 2;
        int cy = SIZE / 2;

        canvas.translate(cx, cy);
        if (mValues != null) {            
            canvas.rotate(-mValues[0]);
        }
        
        mPaint.setColor(Color.RED);
        mPaint.setStrokeWidth(1f);
//        if (x1 == x2) {
//          if (y2 > y1) {
//            canvas.drawLine(0, 0, 0, SIZE / 2, mPaint);
//          } else {
//            canvas.drawLine(0, 0, 0, - SIZE / 2, mPaint);
//          }
//        } else {
//          double alpha = Math.atan((y2 - y1) / (x2 - x1));
//          float yB = (float) (SIZE / 2 * Math.cos(alpha));
//          float xB = (float) (SIZE / 2 * Math.sin(alpha));
//          canvas.drawLine(0, 0, xB, yB, mPaint);
//        }
        canvas.drawColor(backgroundColor);
        mPaint.setColor(Color.RED);
        Path path = new Path();
        path.lineTo(-5, -5);
        path.lineTo(0, 15);
        path.lineTo(5, -5);
        path.lineTo(0, 0);
        canvas.drawPath(path, mPaint);
    }

    @Override
    protected void onAttachedToWindow() {
        mAnimate = true;
        super.onAttachedToWindow();
    }
    
    @Override
    protected void onDetachedFromWindow() {
        mAnimate = false;
        super.onDetachedFromWindow();
    }
}