There is a stand alone builder called "JFormDesigner" except it requires payments but you can get a free trial.
If you gots more questions feel free to ask and look at Apeacs post.
I made some mistakes in the paste and didn't explain it fairly well to you:
fixed the paste: http://pastebin.com/KErmtQ5k
in your Main class add:
public int CustomIntInTheMainClass = 0;
public String YourStringInTheMainClass = " ";
public boolean start = false;
Yeah my bad, didn't see that he was using javafx
If you got another class you call the method from another class from onStart in the main class
I.e
onStart{
GUI.Initialise();
}
Gui represents the class. initialise represents the method you have that contains the gui components.
EDIT: and make sure your method in the gui class has:
jFrame.setVisible(true);
Right, I see. Will definitely add support for camera turning, the issue with the map seems that its trying to draw the lines even though the minimap tile position is not visible, will try to fix that.