#Threads wait()/notify(), JavaFX + Processing

1 messages · Page 1 of 1 (latest)

little sierra
glossy sapphireBOT
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<@&987246487241105418> please have a look, thanks.

glossy sapphireBOT
#

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little sierra
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it does this:

        new Thread(() -> Application.launch(App.class)).start();

        while (fxSurface.stage == null) {
            try {
                Thread.sleep(5);
            } catch (InterruptedException e) {
            }
        }

inside the PApplet which is the Processing part

# 
public class App extends Application {

    public static PSurfaceFX surface;

    @Override
    public void start(Stage primaryStage) throws Exception {

        FXMLLoader loader = new FXMLLoader(getClass().getResource("ProcessingFX.fxml"));
        Parent root = loader.load();
        Controller.stage = primaryStage;
        Scene scene = new Scene(root, 1280, 720);

        primaryStage.setTitle("ProcessingFX Demo");
        primaryStage.setScene(scene);
        primaryStage.show();

        surface.stage = primaryStage; // finish until here
        Controller.stage = primaryStage;
    }
}

so it kinda waits for this method to finish

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but isnt there a nicer way of doing this? smth like wait() and notify()?

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the Application.launch must be in a different thread

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how would I use wait and notify here?

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is this the correct way? or would now the javafxthread wait for the current thread?

        Thread javafxThread = new Thread(() -> Application.launch(App.class));
        javafxThread.start();
        
        try {
            javafxThread.wait();
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }

    @Override
    public void start(Stage primaryStage) throws Exception {

        FXMLLoader loader = new FXMLLoader(getClass().getResource("/fxml/ProcessingFX.fxml"));
        Parent root = loader.load();
        Scene scene = new Scene(root, 1280, 720);

        primaryStage.setTitle("N-BODY SIMULATION");
        primaryStage.setScene(scene);
        primaryStage.setResizable(false);
        primaryStage.show();

        surface.stage = primaryStage;
        notify();
    }
smoky bear
little sierra
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the example that shows how to use javafx and processing is doing it

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oh yeah you mean generally, why I even work with both

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instead of just one

smoky bear
#

Yea

little sierra
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yeah so I want to make an simulation (preferably in Processing) but also want to add some user friendly interface to it to modify the simulation

smoky bear
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Can't you use javafx for the simulation?

little sierra
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not sure and im not that familiar with javafx for simulation like thsi

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this is kinda all for the simulation:

public class Body {

    private static final float G = 1;

    private PVector position;
    private PVector velocity;
    private PVector acceleration;

    private float mass;

    private Color color = Color.WHITE;

    public Body(PVector position, PVector velocity, float mass) {
        this.position = position;
        this.velocity = velocity;
        this.acceleration = new PVector(0, 0);
        this.mass = mass;
    }

    public void draw(PApplet parent) {
        parent.fill(255);
        parent.stroke(255);
        float radius = PApplet.sqrt(mass) * 2 * 2;
        parent.ellipse(position.x, position.y, radius*2, radius*2);
    }

    public void attract(Body other) {
        PVector force = PVector.sub(position, other.position);
        float distanceSq = PApplet.constrain(force.magSq(), 100, 1000);
        force.normalize();

        float fg = -(G * (mass * other.mass)) / (distanceSq);
        force.setMag(fg);
        acceleration.add(PVector.div(force, mass));
    }

    public void update() {
        position.add(velocity.add(acceleration));
        acceleration.set(0, 0);
    }

    public void setPosition(PVector position) {
        this.position = position;
    }

    public void setVelocity(PVector velocity) {
        this.velocity = velocity;
    }

    public void setAcceleration(PVector acceleration) {
        this.acceleration = acceleration;
    }

    public void setMass(float mass) {
        this.mass = mass;
    }

    public void setColor(Color color) {
        this.color = color;
    }

    public PVector getPosition() {
        return position;
    }

    public PVector getVelocity() {
        return velocity;
    }

    public PVector getAcceleration() {
        return acceleration;
    }

    public float getMass() {
        return mass;
    }

    public Color getColor() {
        return color;
    }

}
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I somehow need to know how to get a window with own coordinates in javafx

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so the right side is the simulation and it should be kinda its own

image.png
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so I can do stuff like:

simulationWindow = ...;
simulationWindow.ellipse/cirlce(x, y, radius) // or smth similar
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and I dont know which window can do that in javafx

smoky bear
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A canvas allows free drawing

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Basically what you have in processing

little sierra
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ah ok

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and is the getGraphicsContext2D the method I am looking for in Canvas?

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canvas itself provides no drawing

little sierra
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that kinda saves my life

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any disadvantages with Canvas?

little sierra
cursive gulch
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thats tip number 1

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but to accomplish what you want you can use a Condition

little sierra
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isnt that kinda the same as wait and notify xD

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await(), singal, singalAll xD

smoky bear
smoky bear
little sierra
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I wont

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just interested

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is it also possible to use some kind of Canvas3D?

smoky bear
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🤷

little sierra
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ok thanks anyways :D

glossy sapphireBOT
#

Closed the thread.

little sierra
smoky bear