jjs -fx

So after some playing around and working with the JavaFX folks, I think we have a proposal for jjs that works with JavaFX.  The -fx flag on jjs will bootstrap scripts using a javafx.application.Application.  Thus, writing JavaFX scripts in Nashorn is very easy.

The basic command line is;
	jjs -fx fxscript.js
You can mix and match other jjs options like -scripting and -- ;
	jjs -fx -scripting fxscript.js -- my script args
The content of the script follows some of the examples I've posted before.  The script may optionally contain JavaFX init, start and/or stop functions.  What is new, is that you can leave them behind and just straight script.  The original hello world example;

var Button    = Java.type("javafx.scene.control.Button");
var StackPane = Java.type("javafx.scene.layout.StackPane");
var Scene     = Java.type("javafx.scene.Scene");

function start(stage) {
    stage.title = "Hello World!";
    var button = new Button();
    button.text = "Say 'Hello World'";
    button.onAction = function() print("Hello World!");
    var root = new StackPane();
    root.children.add(button);
    stage.scene = new Scene(root, 300, 250);
    stage.show();
}

becomes;

var Button    = Java.type("javafx.scene.control.Button");
var StackPane = Java.type("javafx.scene.layout.StackPane");
var Scene     = Java.type("javafx.scene.Scene");

$STAGE.title = "Hello World!";
var button = new Button();
button.text = "Say 'Hello World'";
button.onAction = function() print("Hello World!");
var root = new StackPane();
root.children.add(button);
$STAGE.scene = new Scene(root, 300, 250);
$STAGE.show();

where the stage is now a global var $STAGE (instead of the start function argument.)

Also for convenience, we've predefined includes for all of the JavaFX classes.  I would recommend using only the classes you need (only needed for new and for static field access), but for prototyping having includes really helps things move along.

The hello world example can then be rewritten as;

load("fx:base.js");
load("fx:controls.js");
load("fx:graphics.js");

$STAGE.title = "Hello World!";
var button = new Button();
button.text = "Say 'Hello World'";
button.onAction = function() print("Hello World!");
var root = new StackPane();
root.children.add(button);
$STAGE.scene = new Scene(root, 300, 250);
$STAGE.show();

The complete set of includes are as follows;

fx:base.js
	javafx.stage.Stage
	javafx.scene.Scene
	javafx.scene.Group
	javafx/beans
	javafx/collections
	javafx/events
	javafx/util

fx:graphics.js
	javafx/animation
	javafx/application
	javafx/concurrent
	javafx/css
	javafx/geometry
	javafx/print
	javafx/scene
	javafx/stage

fx:controls.js
	javafx/scene/chart
	javafx/scene/control

fx:fxml.js
	javafx/fxml

fx:web.js
	javafx/scene/web

fx:media.js
	javafx/scene/media

fx:swing.js
	javafx/embed/swing

fx:swt.js
	javafx/embed/swt

Here are a couple more examples;

// fx3d.js

load("fx:base.js");
load("fx:controls.js");
load("fx:graphics.js");
 
var material = new PhongMaterial();
material.diffuseColor = Color.LIGHTGREEN;
material.specularColor = Color.rgb(30, 30, 30);

var meshView = Java.to([
    new Box(200, 200, 200),
    new Sphere(100),
    new Cylinder(100, 200)
], "javafx.scene.shape.Shape3D[]");

for (var i = 0; i != 3; i++) {
    meshView[i].material = material;
    meshView[i].translateX = (i + 1) * 220;
    meshView[i].translateY = 500;
    meshView[i].translateZ = 20;
    meshView[i].drawMode = DrawMode.FILL;
    meshView[i].cullFace = CullFace.BACK;
};

var pointLight = new PointLight(Color.WHITE);
pointLight.translateX = 800;
pointLight.translateY = -200;
pointLight.translateZ = -1000;

var root = new Group(meshView);
root.children.add(pointLight);

var scene = new Scene(root, 800, 800, true);
scene.fill = Color.rgb(127, 127, 127);
scene.camera = new PerspectiveCamera(false);
$STAGE.scene = scene;
$STAGE.show();

// ColorfulCircles.js

load("fx:base.js");
load("fx:controls.js");
load("fx:graphics.js");

var WIDTH = 500;
var HEIGHT = 600;
var animation;

function setup(primaryStage) {
    var root = new Group();
    primaryStage.resizable = false;
    var scene = new Scene(root, WIDTH, HEIGHT);
    scene.title = "Colourful Circles";
    primaryStage.scene = scene;
    
    // create first list of circles
    var layer1 = new Group();
    for(var i = 0; i < 15; i++) {
        var circle = new Circle(200, Color.web("white", 0.05));
        circle.strokeType = StrokeType.OUTSIDE;
        circle.stroke = Color.web("white", 0.2);
        circle.strokeWidth = 4;
        layer1.children.add(circle);
    }
    
    // create second list of circles
    var layer2 = new Group();
    for(var i = 0; i < 20; i++) {
        var circle = new Circle(70, Color.web("white", 0.05));
        circle.strokeType = StrokeType.OUTSIDE;
        circle.stroke = Color.web("white", 0.1);
        circle.strokeWidth = 2;
        layer2.children.add(circle);
    }
    
    // create third list of circles
    var layer3 = new Group();
    for(var i = 0; i < 10; i++) {
        var circle = new Circle(150, Color.web("white", 0.05));
        circle.strokeType = StrokeType.OUTSIDE;
        circle.stroke = Color.web("white", 0.16);
        circle.strokeWidth = 4;
        layer3.children.add(circle);
    }
    
    // Set a blur effect on each layer
    layer1.effect = new BoxBlur(30, 30, 3);
    layer2.effect = new BoxBlur(2, 2, 2);
    layer3.effect = new BoxBlur(10, 10, 3);
    
    // create a rectangle size of window with colored gradient
    var colors = new Rectangle(WIDTH, HEIGHT,
            new LinearGradient(0, 1, 1, 0, true, CycleMethod.NO_CYCLE,
                               new Stop(0,    Color.web("#f8bd55")),
                               new Stop(0.14, Color.web("#c0fe56")),
                               new Stop(0.28, Color.web("#5dfbc1")),
                               new Stop(0.43, Color.web("#64c2f8")),
                               new Stop(0.57, Color.web("#be4af7")),
                               new Stop(0.71, Color.web("#ed5fc2")),
                               new Stop(0.85, Color.web("#ef504c")),
                               new Stop(1,    Color.web("#f2660f"))));
    colors.blendMode = BlendMode.OVERLAY;
    
    // create main content
    var group = new Group(new Rectangle(WIDTH, HEIGHT, Color.BLACK),
                          layer1, 
                          layer2,
                          layer3,
                          colors);
    var clip = new Rectangle(WIDTH, HEIGHT);
    clip.smooth = false;
    group.clip = clip;
    root.children.add(group);
    
    // create list of all circles
    var allCircles = new java.util.ArrayList();
    allCircles.addAll(layer1.children);
    allCircles.addAll(layer2.children);
    allCircles.addAll(layer3.children);
    
    // Create a animation to randomly move every circle in allCircles
    animation = new Timeline();
    for each (var circle in allCircles) {
        animation.getKeyFrames().addAll(
              new KeyFrame(Duration.ZERO, // set start position at 0s
                           new KeyValue(circle.translateXProperty(), Math.random() * WIDTH),
                           new KeyValue(circle.translateYProperty(), Math.random() * HEIGHT)),
              new KeyFrame(new Duration(20000), // set end position at 20s
                           new KeyValue(circle.translateXProperty(), Math.random() * WIDTH),
                           new KeyValue(circle.translateYProperty(), Math.random() * HEIGHT))
              );
    }
    animation.autoReverse = true;
    animation.cycleCount = Animation.INDEFINITE;
}

function stop() {
    animation.stop();
}

function play() {
    animation.play();
}

function start(primaryStage) {
    setup(primaryStage);
    primaryStage.show();
    play();
}



Comments:

This proposal has been approved and finalized by CCC.

Posted by jlaskey on May 09, 2013 at 04:14 AM PDT #

It's necessary to make some changes to these scripts to get them to work with the latest nashorn build. The var Scene = Java.type("javafx.scene.Scene") syntax must be used for the imports, and for the fx3d.js script, the meshView should be a simple js array and each of its elements should be added to the Group with root.children.add(meshView[i]).

Posted by David Conrad on September 30, 2013 at 11:27 AM PDT #

There are a couple issues that I've cleaned up in the code above. The var Scene = Java.type("javafx.scene.Scene") change is discretionary, but recommended (changed above.) The load("fx:base.js") call is broken in recent builds, which caused Scene to be undefined. Should be fixed in b112. The meshView issue is a matter of using Java.to instead of the deprecated Java.toArray.

Posted by jlaskey on September 30, 2013 at 02:18 PM PDT #

Post a Comment:
  • HTML Syntax: NOT allowed
About

Technical discussions and status of the Nashorn JavaScript Project.

Search

Categories
Archives
« April 2014
SunMonTueWedThuFriSat
  
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
   
       
Today