The Buttons on the screen should not be just rectangular, they should be shaped.
If you ever tried to make shaped buttons with any programming language, you know it is hard.
I found an unusual and very easy way to make buttons in any shape you like.
You can see the result in the attached zip file (just unzip and open the "index.html" in your browser)
or here on www.openprocessing.com
Step 1: Paint the buttons
The dimensions should be the same as the window size of your program or applet.
Then you copy the buttons and fill the buttons with different colors.
Step 2: Export the images
Step 3: The Processing sketch
The first image is visible on the screen, but the second is just loaded not shown.
You can find out which button is clicked with the second image. If you have an
click event, look on the invisible image which color is there.
So, every button has an different color in the invisible image. Look in the array
for the corresponding color, and you know which button it was.
To create the color array you can uncomment the line 43 (println("0x"+hex(testcolor));)
and click each button separately.
Step 4: Try it
In the pic you can see an working onscreen keyboard (german layout) for an kiosk computer.
And now play with your ideas. Hope you can create many interesting things with this trick. Please let me know.
Hope you enjoy
greetings from germany