android 画人脸识别圆圈

package com.android.ovaldemo;

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

public class Oval extends View {

	private Paint mPaint;
	private Bitmap mWhiteDot;
	private Bitmap mBitmapCheck;
	private Bitmap mFinishGlow;
	private static final float POINTS [][] ={
        { 0.0F,-1.0F},
        { 0.16F, -0.98F},
        { 0.34F, -0.92F}, 
        { 0.5F, -0.82F}, 
        { 0.64F, -0.7F},
        { 0.74F, -0.54F}, 
        { 0.78F, -0.36F}, 
        { 0.8F, -0.18F}, 
        { 0.78F, 0.0F}, 
        { 0.75F, 0.2F}, 
        { 0.7F, 0.37F}, 
        { 0.62F, 0.54F},
        { 0.52F, 0.71F}, 
        { 0.4F, 0.83F}, 
        { 0.26F, 0.94F},
        { 0.08F, 1.0F},
        { -0.08F, 1.0F}, 
        { -0.26F, 0.94F}, 
        { -0.4F, 0.83F}, 
        { -0.52F, 0.71F},
        { -0.62F, 0.54F}, 
        { -0.7F, 0.37F},
        { -0.75F, 0.2F}, 
        { -0.78F, 0.0F},
        { -0.8F, -0.18F}, 
        { -0.78F, -0.36F},
        { -0.74F, -0.54F}, 
        { -0.64F, -0.7F}, 
        { -0.5F, -0.82F}, 
        { -0.34F, -0.92F},
        { -0.16F, -0.98F}
	};

	public Oval(Context context, AttributeSet attrs) {
		super(context, attrs);
		// TODO Auto-generated constructor stub
		mPaint = new Paint();
		mWhiteDot = BitmapFactory.decodeResource(getResources(),
				R.drawable.ic_facial_dot);
		mBitmapCheck = BitmapFactory.decodeResource(getResources(),
				R.drawable.ic_facial_dot_check);
		mFinishGlow = BitmapFactory.decodeResource(getResources(),
				R.drawable.ic_facial_dot_correct);
	}

	@Override
	protected void onDraw(Canvas canvas) {
		// TODO Auto-generated method stub
		super.onDraw(canvas);
		int i = 0;
		float f2,f3,f4,f5,f6,f7;
		while (i < POINTS.length) {
			f2 = 0.37F * (POINTS[i][0] * (float)getWidth()) + (float)(getWidth() / 2);
            f3 = 0.37F * (POINTS[i][1] * (float)getWidth()) + (float)(getHeight() / 2);
            f4 = f2 - (float)(mFinishGlow.getWidth() / 2);
            f5 = f3 - (float)(mFinishGlow.getHeight() / 2);
            f6 = f2 - (float)(mWhiteDot.getWidth() / 2);
            f7 = f3 - (float)(mWhiteDot.getHeight() / 2);
            
            canvas.drawBitmap(mWhiteDot, f6, f7, mPaint);
			i++;
		}
	}

}

　　效果图: