android compassview

This class gives the compas view inandroid.Ihave give only the compassview .. this not the full project.

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.View;

public class CompassView extends View {

    private static final Float RADIUS = 0.9F;
    private static final Float PI = 3.14F;
    private static final int ARC = 15;
    public static Float mAzimutAngle;
    private String mDirection;
    private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private boolean isDrawn;
   

    public CompassView(Context context) {
        super(context);
        init();
    }

    public CompassView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CompassView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(3);
        mPaint.setColor(Color.WHITE);
        mPaint.setTextSize(30);
        isDrawn = true;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),
                MeasureSpec.getSize(heightMeasureSpec));
    }

    @Override
    protected void onDraw(Canvas canvas) {

        int cx = getMeasuredWidth() / 2;
        int cy = getMeasuredHeight() / 2;
        float radiusCompass;
        if (cx > cy) {
            radiusCompass = (float) (cy * RADIUS);
        } else
            radiusCompass = (float) (cx * RADIUS);
        canvas.drawCircle(cx, cy, radiusCompass, mPaint);

        if (mAzimutAngle != null)
            canvas.rotate(mAzimutAngle, cx, cy);

        mPaint.setColor(0xff0000ff);

        if (!isDrawn) {
            canvas.drawLine(cx,    cy,
                    (float) (cx + radiusCompass
                            * Math.sin((double) (-ARC) * PI / 180)),
                    (float) (cy - radiusCompass
                            * Math.cos((double) (-ARC) * PI / 180)), mPaint);

            canvas.drawLine(cx,    cy,
                    (float) (cx + radiusCompass
                            * Math.sin((double) (ARC) * PI / 180)),
                    (float) (cy - radiusCompass
                            * Math.cos((double) (ARC) * PI / 180)), mPaint);
        }
        canvas.drawText(String.valueOf(mDirection), cx, cy, mPaint);
    }

    public void updateDirection(String direction) {
        isDrawn = false;
        mDirection = direction;

    }

}