Flipping a bitmap in android help?

此生再无相见时 提交于 2019-12-05 08:19:32
Christopher Perry

Since you're using Canvas, why not try the drawBitmap (Bitmap bitmap, Matrix matrix, Paint paint) method. Use a Matrix that flips the x coordinates.

You can do something like this:

Matrix flipHorizontalMatrix = new Matrix();
flipHorizontalMatrix.setScale(-1,1);
flipHorizontalMatrix.postTranslate(myBitmap.getWidth(),0);

canvas.drawBitmap(myBitmap, flipHorizontalMatrix, myPaint);

Thanks,check out this code it may be useful for you to rotate an Bitmap image.. Here i have a taken a aquarium fish example,it should be moved from left to right and flipped and continue moving from right to left and viceversa.. here is the code for you..

           protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    fish = BitmapFactory.decodeResource(getResources(), R.drawable.fish);
            v = new OurView(this); 

public class OurView extends SurfaceView implements Runnable {

    Thread t = null;
    SurfaceHolder holder;
    boolean isitOK = false;
    String Flag = "right";
    Bitmap rotatedBitmap=null;
    Matrix rotateRight = new Matrix();
    Matrix rotateLeft = new Matrix();
    Bitmap rSprite=null;
    Bitmap lSprite=null;
    public OurView(Context context) {
        super(context);
        holder = getHolder();
        rotateLeft.setScale(-1, 1);


         rSprite = Bitmap.createBitmap(fish, 0, 0,
                fish.getWidth(), fish.getHeight(), rotateRight, true);
         lSprite = Bitmap.createBitmap(fish, 0, 0,
                fish.getWidth(), fish.getHeight(), rotateLeft, true);
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub

        while (isitOK == true) {
            if (!holder.getSurface().isValid()) {
                continue;
            }
            Canvas canvas = holder.lockCanvas();

            canvas.drawBitmap(bg, 0, 0, null);
            if(Flag == "right")
            canvas.drawBitmap(lSprite, x, y, null);

            if(Flag == "left")
            canvas.drawBitmap(fish, x, y, null);    

                if (Flag == "right" && x <= 60) {

                    x++;
                    if (x == 60) {

                        Flag = "left";
                    //  canvas.drawBitmap(rSprite, 0, fish.getWidth(), null);
                        canvas.drawBitmap(fish, x, y, null);    
                    }
                }               
                if (Flag == "left" && x >= 0) {
                    x--;
                    if (x == 0) {
                    Flag = "right";

                    canvas.drawBitmap(fish, x, y, null);
                    }
                }




            holder.unlockCanvasAndPost(canvas);



        }
    }
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