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   源码介绍

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package cliu.TutorialOnFaceDetect;



import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.widget.ImageView;

class MyImageView extends ImageView {
	private Bitmap mBitmap;        
	private Canvas mCanvas;
	private int mBitmapWidth = 200;
	private int mBitmapHeight = 200;
	private Paint mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
	private int mDisplayStyle = 0;
	private int [] mPX = null;
	private int [] mPY = null;
	    
	public MyImageView(Context c) {
		super(c);         
		init();               
	}             

	public MyImageView(Context c, AttributeSet attrs) {
		super(c, attrs);
		init();
	}

	
	
	private void init() {                
		mBitmap = Bitmap.createBitmap(mBitmapWidth, mBitmapHeight, Bitmap.Config.RGB_565);
		mCanvas = new Canvas(mBitmap);                            

		mPaint.setStyle(Paint.Style.STROKE);
		mPaint.setStrokeCap(Paint.Cap.ROUND);
		mPaint.setColor(0x80ff0000);
		mPaint.setStrokeWidth(3);
	}     
	
	public Bitmap getBitmap() {
		return mBitmap;
	}
	
	@Override
	public void setImageBitmap(Bitmap bm) { 
		if (bm != null) {        
			mBitmapWidth = bm.getWidth();        
			mBitmapHeight = bm.getHeight(); 

			mBitmap = Bitmap.createBitmap(mBitmapWidth, mBitmapHeight, Bitmap.Config.RGB_565);        
			mCanvas = new Canvas();        
			mCanvas.setBitmap(mBitmap);                               
			mCanvas.drawBitmap(bm, 0, 0, null);                                   
		}

		super.setImageBitmap(bm);           
	}               

	@Override
	protected void onSizeChanged(int w, int h, int oldw, int oldh) {
		super.onSizeChanged(w, h, oldw, oldh);

		mBitmapWidth = (mBitmap != null) ? mBitmap.getWidth() : 0;
		mBitmapHeight = (mBitmap != null) ? mBitmap.getHeight() : 0;
		if (mBitmapWidth == w && mBitmapHeight == h) {
			return;
		}

		if (mBitmapWidth < w) mBitmapWidth = w;
		if (mBitmapHeight < h) mBitmapHeight = h;
	}                	      
	
	// set up detected face features for display
	public void setDisplayPoints(int [] xx, int [] yy, int total, int style) {
		mDisplayStyle = style;
		mPX = null;
		mPY = null;
		
		if (xx != null && yy != null && total > 0) {			
			mPX = new int[total];
			mPY = new int[total];

			for (int i = 0; i < total; i  ) {
				mPX[i] = xx[i];
				mPY[i] = yy[i];
			}
		}
	}
	
	@Override
	protected void onDraw(Canvas canvas) {	
		super.onDraw(canvas); 
		
		if (mBitmap != null) {
			canvas.drawBitmap(mBitmap, 0, 0, null);

			if (mPX != null && mPY != null) {
				for (int i = 0; i < mPX.length; i  ) {
					if (mDisplayStyle == 1) {
						canvas.drawCircle(mPX[i], mPY[i], 10.0f, mPaint);
					} else {
						canvas.drawRect(mPX[i] - 20,  mPY[i] - 20, mPX[i]   20,  mPY[i]   20, mPaint);
					}
				}
			}
		}
	}       
}