mardi 27 avril 2010

Duke Anim in JavaFX 1.3

In JavaFX 1.3 the evaluation of the KeyValues in the Timeline changed. Now, the KeyValues are evaluated once before the Timeline starts (see "Animation: Changed semantics of KeyValue evaluation" in Java FX 1.3 Migration Guide) and thus my Duke Anim doesn’t work in Java FX 1.3 :(.
To correct it, the function Timeline.evaluateKeyValues()  has been added. This function has to be used for re-evaluates all the keyValues when it is called.
Now, let us correct Duke Anim :)
To correct Duke Anim, I have made only 2 changes:
·         I call the function Timeline.evaluateKeyValues()  at the end of the action function of KeyFrame at 1s.
·         And I declare the variable anim with his type to be able to call the function Timeline.evaluateKeyValues()  in the action function of the KeyFrame.
public var anim:Timeline = Timeline { …

This Duke Anim's version works on : Windows (Seven), Linux (Ubuntu 9.10) and Mac OS X (10.6.3)  with the Default toolkit and the Prism toolkit (JVM argument: -Xtoolkit prism)

package dukeanim;

import java.util.Random;
import javafx.animation.Interpolator;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.Scene;
import javafx.scene.transform.Translate;
import javafx.runtime.ConditionalFeature;
import javafx.runtime.Platform;
import javafx.stage.Stage;

class DukeAnimModel {
    public var imageURL = "{__DIR__}images/duke.png";
    public var x = 0;
    public var y = 0;

    var xTarget = 0;
    var yTarget = 0;

    var xTemp = 0;
    var yTemp = 0;

    public var anim:Timeline =
    Timeline {
        autoReverse: false
        keyFrames: [
            KeyFrame {
                time: 0s
                values: [x => xTemp, y => yTemp]

            KeyFrame {
                time: 1s
                values: [x => xTarget tween
                    Interpolator.SPLINE(0,.5,.5,1),y => yTarget tween

                action: function(): Void{

                    var generator = new Random();
                    xTarget = (generator.nextFloat() * 240 + 1) as Integer;
                    yTarget = (generator.nextFloat() * 320 + 1) as Integer;

        repeatCount: Timeline.INDEFINITE

println("Effect enabled: {Platform.isSupported(ConditionalFeature.EFFECT)}");
println("Input Method enabled: {Platform.isSupported(ConditionalFeature.INPUT_METHOD)}");
println("Scene 3D enabled: {Platform.isSupported(ConditionalFeature.SCENE3D)}");
println("Shape Clip enabled: {Platform.isSupported(ConditionalFeature.SHAPE_CLIP)}");

var dukeAnimModel = DukeAnimModel {};

Stage {
    title: "Application title"
    width: 240  
    height: 320 
    scene: Scene {
        content: ImageView {
            transforms: Translate {
                x: bind dukeAnimModel.x
                y: bind dukeAnimModel.y
            image: Image {
                url: dukeAnimModel.imageURL
    onClose: function(){

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