Chapter 13, Problem 9SA

Program Plan Intro

ScaleTransition class:

• The “ScaleTransition” class makes a node larger or smaller over time.
• The constructors of class define different types of operations.
• The constructors in “ScaleTransition” class includes:
  • ScaleTransition():
    • It creates a “ScaleTransition” object that is empty.
    • The “setDuration” method establishes animation’s duration.
    • The “setNode” method specifies node that is to be animated.
  • “ScaleTransition(duration)”
    • The argument “duration” denotes lasting time duration for animation.
    • The “setNode” method specifies node to be animated.
  • “ScaleTransition(duration, node)”
    • The argument “duration” denotes lasting time duration for animation.
    • The “node” argument denotes the node to animate.

setToX:

• The method “setToX” is used to specify scale factor along X axis.
• It takes value of X coordinate as argument.
• It denotes the ending scale factor of the node.

setToY:

• The method “setToY” is used to specify scale factor along Y axis.
• It takes value of Y coordinate as argument.
• It denotes the ending scale factor of the node.

Example:

The example for “ScaleTransition” class and methods “setToX” and “setToY” is given below:

Circle cir = new Circle(0, 40, 20);

ScaleTransition trns = new ScaleTransition(new Duration(5000), cir)

trns.setFromX(1.0);

trns.setFromY(1.0);

trns.setToX(3.0);

trns.setToX(3.0);

trns.play();

Here, “cir” denotes an object of “Circle” class. The given code generates a circle with particular dimensions. The animation’s duration is 5 seconds. The circle is been displayed with scale factor of 1 initially and it increases to a scale factor of 3.