如何清除油漆用手指在图像？ [英] How to erase paint with finger on Image?

问题描述

任何机构可以告诉我抹去油漆的形象，在我的应用我是prepared图像的手指画，如果我想删除的油漆是，S得到的图像黑色，而不是删除图像。我的code是

 公共类MyView的扩展视图{
    INT BH = originalBitmap.getHeight（）;
    INT体重= originalBitmap.getWidth（）;
    公共MyView的（语境C）{
        超级（C）;
        // mBitmap = Bitmap.createScaledBitmap（originalBitmap，体重，BH，真正的）;
        mBitmap = Bitmap.createBitmap（BW，BH，Bitmap.Config.ARGB_8888）;
        mCanvas =新的Canvas（mBitmap）;
        的mpath =新路径（）;
        mBitmapPaint =新的油漆（Paint.DITHER_FLAG）;
        mBitmapPaint.setXfermode（新PorterDuffXfermode（PorterDuff.Mode.SRC））;
    }
    公共MyView的（上下文C，INT的颜色）{
        超级（C）;

        mBitmap = Bitmap.createScaledBitmap（originalBitmap，体重，BH，真正的）;
        mCanvas =新的Canvas（mBitmap）;
        的mpath =新路径（）;
        mBitmapPaint =新的油漆（Paint.DITHER_FLAG）;
        mBitmapPaint.setXfermode（新PorterDuffXfermode（PorterDuff.Mode.SRC））;
        mCanvas.drawColor（颜色）;
    }
    @覆盖
    保护无效onSizeChanged（INT W，INT小时，INT oldw，诠释oldh）{
        super.onSizeChanged（W，H，oldw，oldh）;
            / * mBitmap = Bitmap.createBitmap（W，H，Bitmap.Config.ARGB_8888）;
            mCanvas =新的Canvas（mBitmap）; * /
    }
    @覆盖
    保护无效的OnDraw（帆布油画）{
        canvas.drawColor（Color.TRANSPARENT）;
        canvas.drawBitmap（mBitmap，0，0，mBitmapPaint）;
        canvas.drawPath（的mpath，mPaint）;
    }
 

油漆擦

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

解决方案

您应该画在透明的自定义视图放置在原来的位图，而不是修改的一部开拓创新。这将保持它的简单。 对于，你可以做

 ＆LT; RelativeLayout的....＆GT;
      ＆LT; ImageView的......设为原始位本/＆GT;
      ＆LT; CustomView ......利用这一点，您可以擦除过./& GT;
＆LT; / RelativeLayout的＆GT;
 

有关获得修改后的位图呼叫的 getDrawingCache（）方法 RelativeLayout的。这会给你的合并位图图像。

希望这有助于。

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));

解决方案

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.

这篇关于如何清除油漆用手指在图像？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！