Wednesday, September 23, 2009

Using JavaFX Classes Directly From Java

Sitting on the Swing side of the fence the grass on the JavaFX side certainly sometimes seems a lot greener.


Knowing that the latest and greatest scene graph code is available somewhere in the pile of JavaFX jars it is tempting to try and get access to it from the Swing side without being "bothered" with the JavaFX language.

Other people like Matt Hicks have had the same thoughts (see I Hate JavaFX; I Love JavaFX!) so I started out with trying Matt's port of the JavaFX Clock and after some fiddling I got it up and running with JavaFX 1.2. Try it by pushing the launch button below.



The code follows (add all the JavaFX SDK jars to your classpath before trying this):

/**
* @author Matt Hicks (matt@matthicks.com)
*/
public class Clock {
private float radius = 77;
private float centerX = 144;
private float centerY = 144;
private Calendar calendar = Calendar.getInstance();
private int hours;
private int minutes;
private int seconds;

private FloatVariable hoursVariable;
private FloatVariable minutesVariable;
private FloatVariable secondsVariable;

public Clock() throws IOException {
nextTick();

// Build JavaFX clock
Group group = new Group();
{
ImageView imageView = new ImageView();
Image image = new Image();
// should be image.set$url() but does not work ?
image.loc$platformImage().set(
ImageIO.read(getClass().getClassLoader().getResource(
"clock_background.png")));
imageView.set$image(image);
group.loc$content().insert(imageView);

Group face = new Group();
{
Translate translate = new Translate();
translate.set$x(centerX);
translate.set$y(centerY);
face.loc$transforms.insert(translate);

// Every third hour
for (int i = 3; i <= 12; i += 3) {
Text text = new Text();
translate = new Translate();
translate.set$x(-5.0f);
translate.set$y(5.0f);
text.loc$transforms.insert(translate);
text.set$font(Font.font("Arial", 16));
text.set$x(radius * ((i + 0) % 2 * (2 - i / 3)));
text.set$y(radius * ((i + 1) % 2 * (3 - i / 3)));
text.set$content(String.valueOf(i));
face.loc$content.insert(text);
}

// Black circle for the rest of the hours
for (int i = 1; i < 12; i++) {
if (i % 3 == 0) {
continue; // Don't show a circle on every third hour
}

Circle circle = new Circle();
Rotate rotate = new Rotate();
rotate.set$angle(30.0f * i);
circle.loc$transforms.insert(rotate);
circle.set$centerX(radius);
circle.set$radius(3.0f);
circle.set$fill(Color.$BLACK);
face.loc$content.insert(circle);
}

// Center circles
Circle circle = new Circle();
circle.set$radius(5.0f);
circle.set$fill(Color.$DARKRED);

face.loc$content.insert(circle);
circle = new Circle();
circle.set$radius(3.0f);
circle.set$fill(Color.$RED);
face.loc$content.insert(circle);

// Second hand
Line line = new Line();
{
Rotate rotate = new Rotate();
BindingExpression exp = new AbstractBindingExpression() {
@Override
public void compute() {
pushValue(seconds * 6f);
}
};
secondsVariable = FloatVariable.make(exp);
rotate.loc$angle().bind(false, secondsVariable);

line.loc$transforms.insert(rotate);

line.set$endY(-radius - 3.0f);
line.set$strokeWidth(2.0f);
line.set$stroke(Color.$RED);
}
face.loc$content.insert(line);

// Hour hand
Path path = new Path();
{
Rotate rotate = new Rotate();
BindingExpression exp = new AbstractBindingExpression() {
@Override
public void compute() {
pushValue((float) (hours + minutes / 60) * 30 - 90);
}
};

hoursVariable = FloatVariable.make(exp);
rotate.loc$angle().bind(false, hoursVariable);
path.loc$transforms.insert(rotate);

path.set$fill(Color.$BLACK);

MoveTo e1 = new MoveTo();
e1.set$x(4.0f);
e1.set$y(4.0f);
path.loc$elements.insert(e1);
ArcTo e2 = new ArcTo();
e2.set$x(4.0f);
e2.set$y(-4.0f);
e2.set$radiusX(1.0f);
e2.set$radiusY(1.0f);
path.loc$elements.insert(e2);
LineTo e3 = new LineTo();
e3.set$x(radius - 15.0f);
e3.set$y(0.0f);
path.loc$elements.insert(e3);
}
face.loc$content.insert(path);

// Minute hand
path = new Path();
{
Rotate rotate = new Rotate();
BindingExpression exp = new AbstractBindingExpression() {
public void compute() {
pushValue((float) minutes * 6 - 90);
}
};
minutesVariable = FloatVariable.make(exp);
rotate.loc$angle().bind(false, minutesVariable);

path.loc$transforms.insert(rotate);
path.set$fill(Color.$BLACK);

MoveTo e1 = new MoveTo();
e1.set$x(4.0f);
e1.set$y(4.0f);
path.loc$elements.insert(e1);
ArcTo e2 = new ArcTo();
e2.set$x(4.0f);
e2.set$y(-4.0f);
e2.set$radiusX(1.0f);
e2.set$radiusY(1.0f);
path.loc$elements.insert(e2);
LineTo e3 = new LineTo();
e3.set$x(radius);
e3.set$y(0.0f);
path.loc$elements.insert(e3);
}
face.loc$content.insert(path);

group.loc$content.insert(face);
}
}

Timeline timeline = new Timeline();
timeline.set$repeatCount(Timeline.$INDEFINITE);

KeyFrame kf = new KeyFrame();
kf.set$time(Duration.valueOf(1000.0f));
kf.set$canSkip(true);
kf.set$action(new Function0<Void>() {
public Void invoke() {
nextTick();
return null;
}
});
timeline.loc$keyFrames.insert(kf);
// this is somewhat hairy JFxtras does it like this I think
Scene scene = new Scene();
scene.loc$content().insert(group);
JPanel panel = new JPanel(new BorderLayout());
TKScene fxNode = scene.get$javafx$scene$Scene$impl_peer();
panel.add(((SwingScene) fxNode).scenePanel, BorderLayout.CENTER);
JFrame frame = new JFrame("JavaFX Clock Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(panel);
frame.setSize(295, 325);
frame.setVisible(true);
timeline.play();
}

public void nextTick() {
calendar.setTimeInMillis(System.currentTimeMillis());
seconds = calendar.get(Calendar.SECOND);
minutes = calendar.get(Calendar.MINUTE);
hours = calendar.get(Calendar.HOUR_OF_DAY);
// trigger bindings to re calc and move hands
if (secondsVariable != null) {
secondsVariable.invalidate();
minutesVariable.invalidate();
hoursVariable.invalidate();
}
}

public static void main(String[] args) throws Exception {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
new Clock();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}

For comparison the JavaFX version follows here:

public class Clock extends CustomNode {

public var radius: Number = 77;
public var centerX: Number = 144;
public var centerY: Number = 144;

public var hours:Number;
public var minutes:Number;
public var seconds:Number;

public function nextTick () {
var now = new Date();
seconds = now.getSeconds();
minutes = now.getMinutes();
hours = now.getHours();
}

public override function create() : Node {
return Group {
content: [
ImageView {
image: Image {
url: "{__DIR__}clock_background.png"
}
},
Group {
transforms: Translate {
x: centerX,
y: centerY
}
content: [
// code to display the numbers for every third hour
for (i in [3, 6, 9, 12])
Text {
transforms: Translate {
x: -5,
y: 5
}
font: Font {
size: 16
}
x: radius * (( i + 0 ) mod 2 * ( 2 - i / 3))
y: radius * (( i + 1 ) mod 2 * ( 3 - i / 3))
content: "{i}"
}, //Text


//code to display a black circle for the rest of the hours on the clock
for (i in [1..12])
if (i mod 3 != 0 ) then Circle {
transforms: Rotate {
angle: 30 * i
}
centerX: radius
radius: 3
fill: Color.BLACK
} //for
else [ ],

// code for the clock's first center circle
Circle {
radius: 5
fill: Color.DARKRED
}, //Circle
//code for the smaller center circle
Circle {
radius: 3
fill: Color.RED
}, //Circle
//code for the seconds hand
Line {
transforms: Rotate {
angle: bind seconds * 6
}
endY: -radius - 3
strokeWidth: 2
stroke: Color.RED
}, //Line
//code for the hour hand
Path {
transforms: Rotate {
angle: bind (hours + minutes / 60) * 30 - 90
}
fill: Color.BLACK
elements: [
MoveTo {
x: 4,
y: 4},
ArcTo {
x: 4
y: -4
radiusX: 1
radiusY: 1},
LineTo{
x: radius - 15
y: 0},
] //elements
}, // Path
// code for the minutes hand
Path {
transforms: Rotate {
angle: bind minutes * 6 - 90
}
fill: Color.BLACK
elements: [
MoveTo {
x: 4,
y: 4},
ArcTo {
x: 4
y: -4
radiusX: 1
radiusY: 1},
LineTo{
x: radius
y: 0},
] // elements
} // Path
] //content
}
]
};
}

init {
var timeline = Timeline {
repeatCount: Timeline.INDEFINITE
keyFrames: [
KeyFrame {
time: 1s
canSkip: true
action: function() {
nextTick();
}
}
]
}
timeline.play();
}
}

Web start depolyment is rather easy as it is possible to take advantage of the JavaFX extension and just add:



to your jnlp file and then do the usual jnlp stuff.

8 comments:

Cay Horstmann said...

Hmmm--I just tried the WebStart app, and all I got was a blank frame.

Cay Horstmann said...

And weirdly enough, when I mouse over the frame, a warning triangle appears to its right.

Carsten said...

Hmm, I forgot the SwingUtilities.invokeLater in main in the current version (works fine under Linux/1.6.0_16). Will upload a new version that uses SwingUtilities.invokeLater tomorrow.

Anthony said...

You've forgotten the import statements.
I think it's relevant to the code in this example.

Anonymous said...
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Anonymous said...
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黑色 said...

blog is great~~祝你人氣高高~........................................

YoungW21087 said...

thx u very much, i learn a lot

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