Animation in Java

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18 Animation
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Figure 18-5
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Rotating a rectangle through 90 degrees
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Listing 18-6
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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
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Rotating a Rectangle
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var node: Node; Stage { title: "Animation #7" width: 200 height: 200 scene: Scene { content: [ node = Rectangle { x: 40 y: 40 width: 100 height: 50 fill: ColorYELLOW stroke: ColorBLACK } ] } } var timeline: Timeline = Timeline { repeatCount: TimelineINDEFINITE keyFrames: [ at (2s) { noderotate => 90 } ] } timelineplay();
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When a timeline is repeated, the values of all the variables that have been changed are reverted to the values that they had at the start of the first key frameThese could be the values that applied when the timeline was started, or the values set in the key frame for time 0s In Listing 18-6, there is no explicit key frame with an elapsed time of zero, so the initial value of the rotate variable, which is 0, is stored when the animation startsAt the start of a repeat cycle, the rotate variable is reset to this value, which causes the rectangle to return instantaneously to its original orientation before the animation starts
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Controlling a Timeline
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over If there had been an explicit first key frame that assigned an initial value to this variable, the result would have been different:
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var timeline: Timeline = Timeline { repeatCount: TimelineINDEFINITE keyFrames: [ at (0s) { noderotate => 30 }, at (2s) { noderotate => 90 } ] }
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The code above assigns the value 30 to the rotate variable at time 0, so when the animation starts, the rectangle will immediately rotate through 30 degrees and then through a further 60 degrees over a period of 2 secondsAt the start of the second and subsequent cycles, the rotate variable will be reset to 30 rather than 0, because that is its value after the key frame at time 0 has taken effect
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Automatically Reversing an Animation
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By default, when an animation is repeated, it restarts from the beginning Sometimes, it is useful to have the animation instead run in reverse when it is repeatedYou can arrange for this to happen by setting the autoReverse variable to true, as shown in the following code:
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var timeline: Timeline = Timeline { repeatCount: TimelineINDEFINITE autoReverse: true keyFrames: [ at (2s) { noderotate => 90 } ] } timelineplay();
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Here s what happens when this animation is played: 1 The rectangle rotates clockwise from 0 degrees to 90 degrees over a period of 2 seconds 2 The animation reverses, and the rectangle rotates counterclockwise from 90 degrees to 0 degrees over a period of 2 seconds 3 The animation reverses again, and the rectangle rotates clockwise from 0 degrees to 90 degrees over a period of 2 seconds 4 and so on In this case, at the end of the animation, the rotate variable is not reset to its initial value Instead, it starts with its final value of 90, and the interpolation is run in reverse so
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18 Animation
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that the variable is assigned decreasing values that will result in it having its initial value at the end of all the even-numbered cycles
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Pausing, Stopping, and Restarting an Animation
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Normally, you will start an animation and allow it to run to its conclusion, but you may want to provide the user with the means to suspend it or even to stop itThe Timeline class provides functions that let you do thisThe example code in the file javafxanimation/Animation8fx creates a scene that contains the animation from Listing 18-1 together with some buttons that let you use these functions to control the timeline, as shown in Figure 18-6You can use this example to experiment with the functions and variables that we discuss in this section and the next
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Figure 18-6