在android上的画布内坐标

Question

我正在开发一个用于在两点之间绘制线条的应用程序。例如：

我有这样的地图（请想象X是点）：

   X     X     X     X     X     X     X     X     X     X

每个人都是用这句话创建的：

  

canvas.drawCircle（50,100,15，paint）;
        canvas.drawCircle（148,100,15，paint）;
          canvas.drawCircle（246,100,15，paint）;
          canvas.drawCircle（344,100,15，油漆）;
          canvas.drawCircle（442,100,15，油漆）;
          canvas.drawCircle（540,100,15，油漆）;
          canvas.drawCircle（638,100,15，油漆）;
          canvas.drawCircle（736,100,15，油漆）;
          canvas.drawCircle（834,100,15，油漆）;
          canvas.drawCircle（932,100,15，油漆）;

我使用监听器来捕捉用户交互的位置

  

案例MotionEvent.ACTION_UP：
  downx = event.getX（）;
  downy = event.getY（）;

问题是当我在点（932,100）和（832,100）之间进行clic时，X位置返回771并且它不是832和932之间的值。

这是我的代码：

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    drawingImageView = (ImageView) this.findViewById(R.id.DrawingImageView);
    Display display = getWindowManager().getDefaultDisplay();
    Point size = new Point();
    int PMaxX=0;
    int PMaxY =0;
    final ArrayList<ArrayList<Integer>> Matriz = new ArrayList<ArrayList<Integer>>();

    if (android.os.Build.VERSION.SDK_INT >= 13) {
        display.getSize(size);
        PMaxX = size.x;
        PMaxY = size.y;
    } else if (android.os.Build.VERSION.SDK_INT < 13) {
       // Log.d("State", "Prueba menor 13");
        PMaxX  = display.getWidth();
        PMaxY = display.getHeight();
    }

    Bitmap bitmap = Bitmap.createBitmap(PMaxX, PMaxY, Bitmap.Config.ARGB_8888);
    canvas = new Canvas(bitmap);

    paint = new Paint();
    paint.setColor(Color.rgb(0, 0, 0));
    paint.setStrokeWidth(10);
    canvas.drawCircle(50, 100, 15, paint);
    canvas.drawCircle(148, 100, 15, paint);
    canvas.drawCircle(246, 100, 15, paint);
    canvas.drawCircle(344,100,15,paint);
    canvas.drawCircle(442,100,15,paint);
    canvas.drawCircle(540,100,15,paint);
    canvas.drawCircle(638,100,15,paint);
    canvas.drawCircle(736,100,15,paint);
    canvas.drawCircle(834,100,15,paint);
    canvas.drawCircle(932,100,15,paint);
    canvas.drawCircle(1065,100,15,paint);


    drawingImageView.setImageBitmap(bitmap);
    drawingImageView.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            int action = event.getAction();
            switch (action) {
                case MotionEvent.ACTION_UP:
                    downx = event.getX();
                    downy = event.getY();

                    Log.d("State","Show X" + Float.toString(downx));
                    Log.d("State","Show Y" + Float.toString(downy));
                    break;
                default:
                    break;
            }
            return true;
        }
    });

}