Timelines in Java

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Timelines
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As you saw in 4, animation is controlled by a timelineThe timeline uses key frames to define the variables whose values are to be set at specific points in the animation The code in Listing 18-1 creates a timeline that moves a circle from one side of the scene to the other over a period of 3 seconds, using a custom node class (called Wheel) that we developed in 16, Shapes,Text, and Images 1
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This code is in the file javafxanimation/Animation1fx
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18 Animation
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Listing 18-1
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
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A Simple Animation
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package javafxanimation; import import import import import javafxanimationTimeline; javafxsceneNode; javafxsceneScene; javafxscenepaintColor; javafxstageStage;
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var node: Node; var scene: Scene; Stage { title: "Animation #1" scene: scene = Scene { width: 500 height: 100 content: [ node = Wheel { fill: ColorYELLOW stroke: ColorBLACK radius: 50 } ] } } var timeline = Timeline { keyFrames: [ at (3s) { nodetranslateX => scenewidth nodelayoutBoundswidth; noderotate => 360; } ] } timelineplay();
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The code on lines 17 to 21 creates an instance of the Wheel class and places it at the origin of the scene, as shown in the top frame of Figure 18-12 The animation is provided by the Timeline object on lines 26 to 33As you can see, a single key frame specifies what should happen 3 seconds after the animation starts, which happens when its play() function is called on line 34We ll look at the details of the
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The Wheel appears at the origin because its translateX and translateY variables both have their default value of 0
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Timelines
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Figure 18-1
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Animating a circle across the scene
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timeline in the sections that followThe important point to note here is that to create this animation, it is only necessary to specify where the circle should be when the animation is complete and how long it should take to get there Although in this case there is only one defined key frame, a second one will be created automatically when the animation is startedThis implicit key frame represents the initial state of all the variables that are affected by the animation, and it is associated with an elapsed time of zero An implicit starting key frame is only created when, as in this example, one is not actually included in the definition of the timeline The key frames in this simple animation describe only the start and end conditions In more complex animations, there would be other key frames that specify various intermediate states When the animation runs, the wheel moves from left to right across the scene as a result of the change to its translateX variable caused by the code on line 29 of Listing 18-1At the same time, the code on line 30 causes it to rotate through 360 degreesYou can see the effect of this in the middle and bottom frames of Figure 18-1 The position of the wheel and the distance through which it has rotated at any given elapsed time between 0 and 3 seconds are both calculated by the JavaFX runtimeThe process of calculating the values of the translateX and rotate variables at times between 0 and 3 seconds is called interpolationThere are various different ways to interpolate the values of these variables, which we ll discuss in the section Interpolation and Interpolators, later in this chapter In this case, we use the default, which is linear interpolationAs a result, after 1 second, the wheel will be one-third of the way across the scene and will have rotated through 120 degrees, and after 2 seconds it will be two-thirds of the way across and will have turned through 240 degrees
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