Just read throught this, very usefule Though shouldn't function on.paint(gc)
        drawRoundRect(gc, 100, 50, 20, 15, 5)
        ...
end in the second code block be gc:drawRoundRect(100, 50, 20, 15, 5) then? Because it doesn't seem any different to me (I may as well be wrong, I'm not that good yet )

That looks like one fancy calculator. Reminds me of that touch model of TI. Do we know anything about the hardware/capabilities of the physical calc already?

I had eric set up on my windows pc, but lost it during a some maintenance. Now I'm trying to get it back, but I just don't know how anymore. Does anyone have a clear tutorial on what to do (like how to install sid, because there is no exe )? Because I'm pretty lost and confused now  :'(

Javadoc
Javadoc is the documentation of stuff. You can provide a number of tags with it to give information about what it does. A sample could look like:

/**
*  @author ElementCoder
*  This class is an example.
*/
public class Example
{
  /**
  *  @author ElementCoder
  *  @version 1.0
  *  @param par1 first parameter
  *  @param par2 second parameter
  *  Method description here.
  */
  public void myMethod(int par1, String par2){}
}
These are not all the tags you can use, there are more. If you're using Eclipse, the javadoc of a method (if there is any) will show up when hovering over the method. Otherwise it's usually exported along the api/lib in browse-able html format.

Autoboxing
Autoboxing is when primitives are automatically converted to their respective Object form. Its counterpart is unboxing, converting an Object to its primitive. Small example:
ArrayList<Integer> myList = new ArrayList<Integer>();
myList.add(1); //Autoboxing
myList.add(2); //Autoboxing
int x = myList.get(0); //Unboxing
When storing in the list the ints 1 and 2 get converted to Integers automatically. The 4th line automatically converts the Integer to int. All primitives have an Object counterpart:
int - Integer; boolean - Boolean; byte - Byte; char - Character; float - Float; double - Double; long - Long; short - Short
Edit: added autoboxing.

Great idea, I usually come across simple problems that I do not see worthy of their own topic You'll certainly hear from me when I get back to Java

The Student Software simulates the nspire thus allowing you to calculate, graph, make documents and more on your computer. A 1-year license for the software comes with the calculator IIRC.

That only changes the stack order of the elements, I need the placement to be different. When removing float it centers, but crawls behind the bar like and when doing float it goes below the bar correctly like but then it doesn't center. I need it to be like the last picture, but centered.

I'm fairly sure that is TINCS, without nover the texture mode is something like 7 FPS I think, but that might be a bit off. It's not as smooth as in the video.