Effect: Advanced Interpolators - JavaFX Special Effects - page 89

var rotate = Rectangle{
translateX: width + 80
translateY: 90;
width: 70
height: 70
fill: Color.MAGENTA
rotate: bind currentValue*360.0
}
insert rotate into content;
}
}
Listing 5-2 shows the class InterpolatorView, which extends Group . Setting the property
interpolator , which populates the content by calling the function draw , controls the visual appearance
of this Node .
The function draw creates a graph that displays an Interpolator as a function of time. The function
draw also creates several animated components. The first is a red line that moves across the graph to
show which value of the Interpolator is being expressed by the other components.
The other two components are a green dot that moves vertically with the value currentValue and a
rotating square, which is also synchronized with the currentValue .
Built-In Interpolators
The interpolators that come with JavaFX are just enough to whet the appetite. All of the built-in
interpolators can be accessed by static calls to the class Interpolator, as shown in the first example. A
description of each interpolator follows and is demonstrated in the companion code.
Linear
The linear interpolator is the default interpolator used by KeyFrame . It is not much of an Interpolator , as
it simply returns the value passed to it. A node being animated with a linear interpolator starts moving
and travels at a constant speed until it suddenly stops at its destination. For the sake of completeness,
Figure 5-1 shows a graph describing the motion over time.