c++ - Android + OpenCV: OnTouch getX(), getY() doesn't return right values -

i using opencv4android facedetection sample. have global table rectangles of spoted faces:

private rect[] facesarray; 

also global floats store onclick coordinates,

private float onclickx; private float onclicky; 

which generated ontouchevent:

@override public boolean ontouchevent(motionevent e) {      onclickx = e.getx();     onclicky = e.gety();      switch (e.getaction()) {     case motionevent.action_down:         // not important matter happens here      }      return super.ontouchevent(e); } 

in oncameraframe method before returning mat view doing:

core.circle(mrgba,new point(onclickx,onclicky), 40,  new scalar(0, 255, 0, 255)); 

so happens. draw small, green circle on coordinates fetched in ontouchevent , sent global variables. variables (onclickx, onclicky) read oncameraframe , used core.circle() function. problem that, circle isn't drawn precisely under finger in lower-right place. happens: https://dl.dropboxusercontent.com/u/108321090/device-2013-07-24-004207.png

and circle in same direction/position finger whenever on screen, , meets in top-left corner, dissapears on bottom right corner (goes outside screen). tried using getrawx, geyrawy -> result same, don't understeand why commands doesn't return precise tap position somewhere near it. have no clue how fix this.

this solution problem.

which is,

@override public boolean ontouch(view arg0,motionevent event) {  double cols = mrgba.cols();// mrgba image frame double rows = mrgba.rows();  double xoffset = (mopencvcameraview.getwidth() - cols) / 2; double yoffset = (mopencvcameraview.getheight() - rows) / 2;  onclickx = (float)(event).getx() - xoffset; onclicky = (float)(event).gety() - yoffset;