How to use

setScaleAndCenter

method

in

com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView

mImageView.setScaleAndCenter(maxScale, new PointF(imageWidth / 2, imageHeight / 2));

  view.setScaleAndCenter(0f, new PointF(3900, 3120));
  view.setPanEnabled(false);
} else {
  view.setScaleAndCenter(1f, new PointF(3900, 3120));
  view.setZoomEnabled(false);
} else {

/**
 * Double tap zoom handler triggered from gesture detector or on touch, depending on whether
 * quick scale is enabled.
 */
private void doubleTapZoom(PointF sCenter, PointF vFocus) {
  if (!panEnabled) {
    if (sRequestedCenter != null) {
      // With a center specified from code, zoom around that point.
      sCenter.x = sRequestedCenter.x;
      sCenter.y = sRequestedCenter.y;
    } else {
      // With no requested center, scale around the image center.
      sCenter.x = sWidth()/2;
      sCenter.y = sHeight()/2;
    }
  }
  float doubleTapZoomScale = Math.min(maxScale, SubsamplingScaleImageView.this.doubleTapZoomScale);
  boolean zoomIn = (scale <= doubleTapZoomScale * 0.9) || scale == minScale;
  float targetScale = zoomIn ? doubleTapZoomScale : minScale();
  if (doubleTapZoomStyle == ZOOM_FOCUS_CENTER_IMMEDIATE) {
    setScaleAndCenter(targetScale, sCenter);
  } else if (doubleTapZoomStyle == ZOOM_FOCUS_CENTER || !zoomIn || !panEnabled) {
    new AnimationBuilder(targetScale, sCenter).withInterruptible(false).withDuration(doubleTapZoomDuration).withOrigin(ORIGIN_DOUBLE_TAP_ZOOM).start();
  } else if (doubleTapZoomStyle == ZOOM_FOCUS_FIXED) {
    new AnimationBuilder(targetScale, sCenter, vFocus).withInterruptible(false).withDuration(doubleTapZoomDuration).withOrigin(ORIGIN_DOUBLE_TAP_ZOOM).start();
  }
  invalidate();
}

  @Override
  public void onImageLoaded() {
    super.onImageLoaded();
    float scale = imageView.getScale();
    PointF center = new PointF(imageView.getWidth() / 2, 0.0f);
    imageView.setScaleAndCenter(scale, center);
  }
});

/**
 * Double tap zoom handler triggered from gesture detector or on touch, depending on whether
 * quick scale is enabled.
 */
private void doubleTapZoom(PointF sCenter, PointF vFocus) {
  if (!panEnabled) {
    if (sRequestedCenter != null) {
      // With a center specified from code, zoom around that point.
      sCenter.x = sRequestedCenter.x;
      sCenter.y = sRequestedCenter.y;
    } else {
      // With no requested center, scale around the image center.
      sCenter.x = sWidth()/2;
      sCenter.y = sHeight()/2;
    }
  }
  float doubleTapZoomScale = Math.min(maxScale, SubsamplingScaleImageView.this.doubleTapZoomScale);
  boolean zoomIn = scale <= doubleTapZoomScale * 0.9;
  float targetScale = zoomIn ? doubleTapZoomScale : minScale();
  if (doubleTapZoomStyle == ZOOM_FOCUS_CENTER_IMMEDIATE) {
    setScaleAndCenter(targetScale, sCenter);
  } else if (doubleTapZoomStyle == ZOOM_FOCUS_CENTER || !zoomIn || !panEnabled) {
    new AnimationBuilder(targetScale, sCenter).withInterruptible(false).withDuration(doubleTapZoomDuration).withOrigin(ORIGIN_DOUBLE_TAP_ZOOM).start();
  } else if (doubleTapZoomStyle == ZOOM_FOCUS_FIXED) {
    new AnimationBuilder(targetScale, sCenter, vFocus).withInterruptible(false).withDuration(doubleTapZoomDuration).withOrigin(ORIGIN_DOUBLE_TAP_ZOOM).start();
  }
  invalidate();
}