Fall Flowers Animations

花落時節 / The Flower Falling

This section explains techniques employed in the Tree Animation example to animate the tree and season change. Parallel transition is used to start all the animations in the scene as shown in .

The code in creates the Tree growing animation:

Example 2-8 Branch Growing Animation

private Animation animateBranchGrowing(List
branchGeneration, int depth, Duration duration) { ParallelTransition sameDepthBranchAnimation = new ParallelTransition; for (final Branch branch : branchGeneration) { Timeline branchGrowingAnimation = new Timeline(new KeyFrame(duration, new KeyValue(branch.base.endYProperty, branch.length))); sameDepthBranchAnimation.getChildren.add( new SequentialTransition( PauseTransitionBuilder.create.duration(Duration.ONE).onFinished(new EventHandler { @Override public void handle(ActionEvent t) { branch.base.setStrokeWidth(branch.length / 25); } }).build, branchGrowingAnimation)); } return sameDepthBranchAnimation; }

Because all the branch lines are calculated and created simultaneously, they could appear on the scene as dots. The code introduces a few tricks to hide the lines before they grow. In Example the code duration.one millisecond pauses transition for an unnoticeable time. In the, the base.setStrokeWidth(0) code sets branches width to 0 before the grow animation starts for each generation.

Example 2-9 Tree Growing Animation Optimization

private void setBranchStyle(int depth) { base.setStroke(Color.color(0.4, 0.1, 0.1, 1)); if (depth < 5) { base.setStrokeLineJoin(StrokeLineJoin.ROUND); base.setStrokeLineCap(StrokeLineCap.ROUND); } base.setStrokeWidth(0); } }

Creating Tree Crown Movement

In parallel with growing a tree, wind animation starts. Tree branches, leaves, and flowers are moving together.

Tree wind animation is similar to grass movement animation, but it is simpler because only the angle of the branches changes. To make the tree movement look natural, the bend angle is different for different branch generations. The higher the generation of the branch (that is the smaller the branch), the more it bends. provides code for wind animation.

Source: docs.oracle.com


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