Colour Chooser GUI - Urgent Querie!!

Question

Hello,
Please help! I need to design a �Colour Chooser� using TWO classes(ColourChooser and DrawCanvas) and I need a little help with it.
Basically, there are three panels on a frame.
1.     A Canvas
2.     Three JScrollbars (relating to Red Green and Blue )
3.     Three JTextfields (relating to Red Green and Blue)
You can either move the scrollbars OR enter RGB values into the textfields and the Canvas will change colour accordingly.
My problem is not that difficult, but just that in the first class I have to:
�     Create a constructor that will add the scrollbars, textfields and canvas to the frame
�     Add the actionlisteners and required methods for actionlisteners also.
In the second class I have to:
�     Declare variables to represent the colours Red Green and Blue
�     Create a constructor that will set the size of the canvas
�     Create a method called paint that sets the colour of the rectangle and fills it in.
�     Create a method called setCanvasColour that will accept the variables representing the three colours and repaint the canvas.
My Query:
How do I make these classes interact with each other. I can�t use inheritance as the first class will �extend JFrame� and each class can only extend one super class.
If the canvas is declared in the first class, how can I set it�s size in another class?
Please help me I�m really stumped.
Your friend in Java.
Stoney

Answer 1

Hello,
Please help! I need to design a “Colour Chooser” using TWO classes and I need a little help with it.
Basically, there are three panels on a frame containing:
1. A Canvas
2. Three JScrollbars (relating to Red Green and Blue )
3. Three JTextfields (relating to Red Green and Blue)
You can either move the scrollbars OR enter RGB values into the textfields and the Canvas will change colour accordingly.
My problem is not that difficult, but just that in the first class (public class ColourChooser)I have to:
 Create a constructor that will add the scrollbars, textfields and canvas to the frame
 Add the actionlisteners and required methods for actionlisteners also.
In the second class (public class DrawCanvas) I have to:
 Declare variables to represent the colours Red Green and Blue
 Create a constructor that will set the size of the canvas????
 Create a method called paint that sets the colour of the rectangle and fills it in.
 Create a method called setCanvasColour that will accept the variables representing the three colours and repaint the canvas.
My Query:
If the canvas is declared in the first class, how can I set it’s size in another class?
I have gotten some replies on this but still not sure, I am able to add and set the size of the canvas in the first class, but the exercise is to set the size of the canvas from the second class.
I know that JColorChooser is a handier option but am not allowed to use it. I could really do with some code snippets here guys.
Please help me I’m really stumped.