Rotate and display the butterfly

The code in Listing 4 calls the method named rotatePicture,

• passing the initial value of the thumb on the slider as a parameter
• to cause the initial display of the butterfly to be properly rotated.

Then Listing 4

• calls the show method on the display
• to cause the rotated butterfly image
• to be displayed as shown in Figure 1.

    rotatePicture(slider.getValue());

    display.show();