Exercise 1.9

• Create a new Square object
• Invoke its method makeVisible()
• Make the square bigger by invoking the method changeSize(newSize) (100 is a good size)
• Move the square down by invoking the method moveVertical(distance) (again 80 is a good value)

• Create a new Square object.
• Invoke its method makeVisible()
• Change its color by invoking changeColor()
• write "black" in the popupwindow
• Move the square down by invoking the method moveVertical(distance) (100 is a good value)
• Move it to the right by invoking moveRight()

• Create a new triangle object.
• Invoke its method makeVisible()
• Change its size with changeSize(newHeight, newWidth) (50,140)
• moveVertical(70)
• moveHoizontal(60)

• Create new Circle object.
• Invoke its method makeVisible()
• Change its color by invoking changeColor() (write "yellow" in the popupwindow) Optionally change its size with changeSize(60)
• Move it to the right by invoking moveHorizontal(180)

Exercise 1.11

• It uses the objects of the classes Circle, Square and Triangle.
• It then moves these obejcts to the right places and changes the sizes and colors of the obejcts. Essentially calling the same methods as used in exercise 1.9

Exercise 1.15

• sun.slowMoveVertical(250);
• Compile the Picture class (Press compile in the editor window)
• Create instance of class Picture and invoke its draw() method.

Exercise 1.16

Remove the line (if added in the previous exercise): slowMoveVertical(250); Right below the last } after the draw() method, add the sunset() method :

/**
 * Animates the sunset.
*/ 
public void sunset() {
    sun.slowMoveVertical(250);
}