B4J Question Putting HugeImageView Inside a ScrollPane

[xulihang]

I am trying to put HugeImageView inside a ScrollPane, to make it scrollable with the scroll bars and in a top-left position.

I rewrite the part of scrolling and zooming by using ScrollPane and the part checking visible rect in the view port.

The image loading is done using OpenCV to save memory.

I am having two problems:

1. When zooming, the thumbnail and the tiles ImageView will appear alternatively.
2. If I zoom too much, the view becomes blank.


Any ideas how to solve the problems?



OpenCV is required to build the project: https://github.com/xulihang/OpenCV-B4J/releases/tag/library
Test image: https://upload.wikimedia.org/wikipedia/commons/8/8f/Whole_world_-_land_and_oceans_12000.jpg

 

[xulihang]

The problem is fixed.

1. The size of the panel of the tiles is wrong when the display scale is lower than 1.
2. When zooming, I set the size of the inner node size of the scroll pane first and then move the the cursor's position, causing reloading of the tiles.