How can I mouse pick up and move

For example, in following figure

I want to pick up the ball and move the position by mouse!

example code or matlab function is good

Answer 1

[Rik]

You can do this with the WindowButtonDownFcn (or the equivalent for uifigures: ButtonDownFcn).

Inside that callback you can retrieve the current position of the cursor (CurrentPoint) and set a flag so your WindowButtonMotionFcn can do interesting things like changing the XData and YData properties of your ball.

When the button is released you can set a flag to make the motion function return immediately after it starts (or wipe the property).

If you want a working example: you might be able to find examples on the File Exchange, but you can also have a look at my WindowLevel function, which also responds on dragging.