Animation in Java

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18 Animation
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logic of a game If this looks familiar to you, it is probably because this is essentially the same code as we used for the SnowStorm application, which you saw in the section Adding New Snowflakes in 4 The point of this example is to show how to invoke a function on a regular, timed basis, but you might be wondering whether it is necessary to use an action function to implement a timed counter If you know the target value of the counter and the time over which it should reach that value, you could use a Timeline without an action function, in the usual way:
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var count = 0 on replace { println("count = {count}"); } var timeline = Timeline { keyFrames: [ at (200ms) { count => 10 } ] } timelineplay();
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Here, the trigger is called whenever the value of count changes, and you could use it to perform your timed action However, this doesn t necessarily work because there is no guarantee which values will be assigned to the variable count over the 200ms period of this animationAll that can be known for certain is that it will have the value 10 when the animation finishes Here is the result of running this code on my system:
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count count count count count = = = = = 0 7 8 9 10
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It is worth noting that the following code does not work:
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var count = 0 on replace { println("count = {count}"); } var timeline = Timeline { repeatCount: 10 keyFrames: [ at (20ms) { count => count + 1 } ] } timelineplay();
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On the face of it, this code increments the value of count ten times, because the timeline is repeated that many times, so it appears that this variable should have the value 10 when the timeline finishes However, this is not what happens, because there is an implicit key frame at time 0 that resets count to its initial value of 0 at the start of every cycle Therefore, the result of this code is to change count from 0 to 1, ten times over! If an action function takes a long time to execute or if there is a lot animation or other work going on, it might not be possible for key frames to be reached exactly when their time variable specifies that they should In these circumstances, the JavaFX runtime will skip the execution of action functions if it is permitted to do soThis is controlled by
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Transitions
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the value of the canSkip variable in the KeyFrame object Setting this value to true when possible gives the runtime the greatest possible chance of catching up to the timeline
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Animation Length
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The cycleDuration and totalDuration variables of the Timeline class are read-only values that contain respectively the length of a single cycle of the timeline and the total length of all cyclesThe following code (from the file javafxanimation/Animation13fx) constructs a timeline and prints the values of both of these variables:
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var count = 0; var timeline = Timeline { repeatCount: 10 keyFrames: [ at (20ms) { count => count + 1 } ] } println("Duration of a cycle: {timelinecycleDuration}"); println("Total duration: {timelinetotalDuration}");
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The output from this code is the following:
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Duration of a cycle: 20ms Total duration: 200ms
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The cycle time is the time value of the last key frame in the timeline, which is 20ms in this caseThe total duration is the cycle time multiplied by the repeat count, or 10 * 20ms which is 200ms, as shown in the outputWhen the repeat count is TimelineINDEFINITE, the total duration value will be DurationINDEFINITE
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You can animate any of the variables of a node to produce effects such as translation, fade, rotation, and so onTo do so, you need to create a timeline, associate it with the node, and then start itThe JavaFX runtime includes a small number of classes that do most of this work for youThese classes, which are called transitions, are all derived from the abstract class Transition and can be found in the javafxanimationtransition package There are six predefined transitions and two convenience classes that allow you to run multiple transitions one after the other or in parallelThese classes are discussed in detail in the sections that follow
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