To set the color of the background (or of any other GreenfootImage) you need to use getBackground().setColor(Color.black); (of course any other color would work too). And I think you missed a ; in line 2. That probably will cause compiler errors.

If I understood you right you want a rectagle to be transparent. Thats not so easy because if you overdraw the rectacle using transparent color nothing will heapen. I think the best way would be to use a method like this one: To use this method you have to call it this way: instead of:

I presume the buttons you are using are actors and you want the background of your world to show through them. If this is the case, then filling a rectangle is not necessary as a new GreenfootImage object is transparent (and rectangular) to begin with. The only problem would then be drawing the text on the image with a transparent background; and there are two ways to accomplish that. One is creating a GreenfootImage object with the text (with transparent background) and drawing it on the image of the button. The other is using drawString to draw the string on the image of the button. An example of using this method is in this discussion. The example draws on the world background; but can be adopted to draw on any image.

Hello, and thanks in advice for all the help. I'm afraid all that you have stated is incorrect; I am talking about an actor not a world... I should have said that... Here is the code I have in the actor so far: The whole class in general is in progress... Thanks in advice!

I stated that the button is probably an actor; and my response was along that line of thought. The only thing I am confused about now is where you want the transparencies to be (or on what). If you wanted the button to be transparent, then just remove lines 15 and 16. And, if you want your button object framed, change line 18 to 'image.drawRect(0, 0, 119, 19);', otherwise remove it and line 17. Line 19 does not have any use as 'drawImage' (on the next, and last, statement modifying the image of the button) does not use the set drawing color; so that line can be removed, also. One more thought: in line 13, you have " "+text+" ", which can be simply ""+text because the background is transparent anyway. Question: is the 'Start' button saved in a field in another class? The reason I ask is you have methods in the start class that makes me believe it is; and yet you are changing worlds immediately (without passing any information). And now, I noticed that line 25 should be either 'if (clicked == true)' or 'if (clicked)', not 'if (clicked=true)' which always will be true (using a single equals sign always sets the field on the left to the value on the right).

Thanks for the help, it inspired me to do something! By the way, I wanted the button to be transparent. By the way, I used this code to achieve what I wanted: This is how the detection code turned out: