如何引用我在 JScrollPane 中滚动的距离？

Question

I'm writing code for drawing in a JPanel as if it's a canvas, where I can create shapes by clicking inside the panel. When I click, it places the dots where I want them to go, however if I scroll and then click, it places the dots where the mouse would be if I hadn't scrolled. I assume this is because the mouse coordinates don't change, so I'm guessing I need to add the number of pixels I've scrolled (horizontally and vertically). Is there a command I can use to refer to these values?

Answer 1

It's been a while since I've worked with Swing, but I believe you want to call:

JScrollPane sp = ...
Point viewPosition = sp.getViewport().getViewPosition();

The viewPosition.x and .y will return the offset in pixels from the top left corner.