Wikitude

Hello,

I am trying to get the pinch to zoom functionality working on Android (Android Javascript API). I am working with the Camera v2. I have pulled some examples online but can't get it to work together with Wikitude. I am using example WikitudeCamera2 from the SimpleInputPlugin. This is where the most of the zooming logic is happening.

@Override
    public boolean onTouch(View view, MotionEvent event) {
        try {
            //Activity activity = this;
            //CameraManager manager = (CameraManager) activity.getSystemService(Context.CAMERA_SERVICE);
            CameraCharacteristics characteristics = manager.getCameraCharacteristics(this.getCamera());
            float maxzoom = (characteristics.get(CameraCharacteristics.SCALER_AVAILABLE_MAX_DIGITAL_ZOOM))*10;

            Rect m = characteristics.get(CameraCharacteristics.SENSOR_INFO_ACTIVE_ARRAY_SIZE);
            int action = event.getAction();
            float current_finger_spacing;

            if (event.getPointerCount() > 1) {
                // Multi touch logic
                current_finger_spacing = getFingerSpacing(event);
                if(finger_spacing != 0){
                    if(current_finger_spacing > finger_spacing && maxzoom > zoom_level){
                        zoom_level++;
                    } else if (current_finger_spacing < finger_spacing && zoom_level > 1){
                        zoom_level--;
                    }
                    int minW = (int) (m.width() / maxzoom);
                    int minH = (int) (m.height() / maxzoom);
                    int difW = m.width() - minW;
                    int difH = m.height() - minH;
                    int cropW = difW /100 *(int)zoom_level;
                    int cropH = difH /100 *(int)zoom_level;
                    cropW -= cropW & 3;
                    cropH -= cropH & 3;
                    Rect zoom = new Rect(cropW, cropH, m.width() - cropW, m.height() - cropH);
                    //System.out.print(zoom);
                    Log.v(TAG, zoom.toString());

                    builder.set(CaptureRequest.SCALER_CROP_REGION, zoom);
                }
                finger_spacing = current_finger_spacing;
            } else{
                if (action == MotionEvent.ACTION_UP) {
                    //single touch logic
                }
            }



            try {
                cameraCaptureSession.setRepeatingRequest(builder.build(), null, null);
            } catch (CameraAccessException e) {
                e.printStackTrace();
            } catch (NullPointerException ex) {
                ex.printStackTrace();
            }
        } catch (CameraAccessException e) {
            throw new RuntimeException("can not access camera.", e);
        }
        return true;
    }

The zoom rect is calculated correctly but somehow the 

builder.set(CaptureRequest.SCALER_CROP_REGION, zoom);

is not making any effect. I suspect it is because you are using ImageReader to pipe the data to the wikitude input plugin, but all the camera zooming examples are using their own SurfaceViews. 

Could you advise on how would you go implementing this feature?

Thank you

Thanks Daniel,

the cause of the problem turned out to be trivial - the cropping is not happening on emulator for some reason but works on the device. 

I am marking this as solved but I have run into another issue here: https://support.wikitude.com/support/discussions/topics/5000090364. 

- Tomas