I am new to JQuery library. I am currently trying to create a Draggable by mouse. Say, when I press the mouse it start to draw and then I drag the mouse to change the size and then I release the mouse to finalize the drawing.
Is it possible to do this with JQuery?
It is difficult to understand exactly what you are asking.
If your are interested in drag and drop, look here:
http://jqueryui.com/demos/draggable/#visual-feedback
This is jQuery UI, which is a library for jQuery, that provides many interesting UI widgets (see more here: http://jqueryui.com/demos/)