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Basic Animation
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The repeatCount parameter can be set to a definite number such as 2 or 450 You can also set the repeatCount parameter to the constant INDEFINITE to repeat indefinitely Timeline{ repeatCount: TimelineINDEFINITE; autoReverse:true; keyFrames:[ at (0s) { frametranslateY => 0} at (2s) { frametranslateY => 400 tween InterpolatorLINEAR} ] }play();
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This process is good for simple motions, but what if you want to move your butterfly in a more elaborate way The next section of this chapter covers animating your images along a path
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Animating Along a Path
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If you want to do a lot of math and some tricky calculations you can create a lot of movements with the animation style explained in the previous section However, if you really want to do some complex animation, such as moving an object around the screen in a curving motion, you will want to use path animation, which is another method that JavaFX has for creating animation that allows you to move an object around a predefined path In this section you learn how to create a path using knowledge you picked up in previous chapters You then use this path to animate the butterfly The concept here is that you can create a path using lines, arcs, and points JavaFX will then animate your image moving along this path To begin, set up your 8fx file as show here:
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/* * 8fx * * v10 - J F DiMarzio * * 5/27/2010 created * * Basic Animation * */
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package comjfdimarziojavafxforbeginners; import javafxstageStage; import javafxsceneScene; import javafxfxdFXDNode; import javafxsceneimageImageView; import javafxsceneGroup; /** * @author JFDiMarzio */ /* Create image variables */ var imagePath : String = "{__DIR__}images/butterflyfxz"; var butterflyImage : FXDNode = FXDNode{url: imagePath;} var groupImage : Group = butterflyImagegetGroup("group1"); var butterfly : ImageView; var background : ImageView; /* END Create */ /* Set images */ butterfly = (butterflyImagegetNode("butterfly") as ImageView); background = (butterflyImagegetNode("background") as ImageView); /* End Set */ /* Move butterfly to y0 */ butterflyy = 0; Stage { title : "MyApp" onClose: function () { } scene: Scene { width: 800 height: 600 content: [ groupImage ] } }
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Similar to what you have seen before, this code grabs the same butterfly and background images you have been working with and displays them to the Scene In the previous section you animated the butterfly image travelling up and down the y axis For this example you are going to animate the butterfly moving around an abstract path The next step is to create the path you want your butterfly to travel along You will use a Path node to create this path The node accepts a group of elements to create a path
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Basic Animation
from You can easily create a group of elements that makes an abstractly shaped path The following piece of code defines a small element array with some basic line-based shapes:
NOTE
Be sure to take note of the required packages in the following code import javafxsceneshapeMoveTo; import javafxsceneshapeArcTo; import javafxsceneshapeClosePath; /* Initial shape to move butterfly around */ def pathShape = [ MoveTo {x : 1500, y : 1500} ArcTo {x : 3500, y : 3500, radiusX : 1500, radiusY : 3000} ArcTo {x : 1500, y : 1500, radiusX : 1500, radiusY : 3000} ClosePath{} ];
There is nothing too complex or tricky about what is happening here You have created a collection of elements named pathShape The elements contained within pathShape are MoveTo, two instances of ArcTo, and ClosePath The combination of these elements creates a path your butterfly can follow The MoveTo element does exactly what the name suggests: It moves you to a specific point on the Cartesian grid In this case it moves you to x150, y150 You are specifying this as your first element to cleanly move the starting point of your path before you start drawing The next two elements draw arcs The first ArcTo element draws an arc from the last position of the point (in this case, x150, y150, thanks to the MoveTo element) The second ArcTo draws another arc from the end point of the last arc Finally, the ClosePath element connect the dots and closes your path (if it does not close organically) Keep in mind, all you have right now is a collection of elements You do not yet have a path Luckily, a path can be created from a group of elements You will pass this group of elements into the definition of a path, as shown in the following code Again, take care to note the package that needs to be imported for Path:
import javafxsceneshapePath; /* Path definition */ def butterflyPath : Path = Path{ elements: pathShape }
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