Question

我有一排球。我想,当我采取行动时,球队将走向这一位置。我的这部法典:

 public boolean onTouchEvent(MotionEvent event){

        if(event.getAction()==MotionEvent.ACTION_DOWN){
            x1 = (int) event.getX();
            y1 = (int) event.getY();

            float dx = x1-x;
            float dy = y1-y;
            float d = (float)Math.sqrt(dx*dx+dy*dy);
            vx = dx*4/d;
            vy = dy*4/d;
        }
}

页: 1

protected void onDraw(Canvas canvas) {
        canvas.drawColor(Color.BLACK);

        Matrix matrix = new Matrix();
        matrix2.postTranslate(x - bitmap.getWidth()/2, y - bitmap.getHeight()/2);
        x = x+vx ;
        y = y+vy ;

        canvas.drawBitmap(bitmap, matrix, null);
}

当......时,气球将走向行动方向。但是,为什么气球处于从下至下的行动之中?

Please help me? Thank you?

Answer 1

2. 改变 v类,对 in

    vx = (int)dx*4/d;
    vy = (int)dy*4/d;

之后使用这一方法

    if(Math.abs(x - x1) <= Math.abs(vx) 
        && Math.abs(y - y1) <= Math.abs(vy)){ 
            vx = 0; 
            vy = 0; 
            x = x1;
            y = y1;
    }

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