CODEWITHSUNDEEP
androidpaint
RajaReddy PolamReddy
RajaReddy PolamReddy

Reputation: 22493

How to erase paint with finger on Image?

Can any body tell me to erase the paint on the image , in my application i was prepared the finger painting on image, if i want erase the paint it,s getting black color on image instead of erasing the image. my code is

    public class MyView extends View {
    int bh = originalBitmap.getHeight();
    int bw = originalBitmap.getWidth();
    public MyView(Context c)  {
        super(c);
        //mBitmap = Bitmap.createScaledBitmap(originalBitmap,bw,bh,true);
        mBitmap = Bitmap.createBitmap(bw,bh,Bitmap.Config.ARGB_8888);
        mCanvas = new Canvas(mBitmap);
        mPath = new Path();
        mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        mBitmapPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC));
    }
    public MyView (Context c, int color)  {  
        super(c);

        mBitmap = Bitmap.createScaledBitmap(originalBitmap,bw,bh,true);
        mCanvas = new Canvas(mBitmap);
        mPath = new Path();
        mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        mBitmapPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC)) ;
        mCanvas.drawColor(color);
    } 
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);           
            /*mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
            mCanvas = new Canvas(mBitmap);*/
    }
    @Override 
    protected void onDraw(Canvas canvas) {   
        canvas.drawColor(Color.TRANSPARENT);
        canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
        canvas.drawPath(mPath, mPaint);
    }

for paint erase 

 mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));

Upvotes: 1

Views: 5280

Answers (2)

Sulaiman Khan
Sulaiman Khan

Reputation: 1

define a temporary bitmap and canvas, then draw canvas on that temporary bitmap and pass that bitmap to onDraw your work will be done,

Upvotes: 0

Ron
Ron

Reputation: 24235

You should draw on a transparent custom view placed over the original bitmap instead of modifying the orignal. That will keep it simple. For that you can do

<RelativeLayout ....>
      <ImageView ......set original bitmap to this/>
      <CustomView ...... draw on this, you can erase too./>
</RelativeLayout>

For getting the modified bitmap call the getDrawingCache() method on that RelativeLayout. That will give you the combined bitmap image.

Hope this helps.

Upvotes: 6

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