Skip to content

Draggable and Growable Ball in JavaFX

Two simple JavaFX code handling onMouseDragged event.

import javafx.ui.*;
import javafx.ui.canvas.*;

Canvas {
    content: Circle {
        var x = 50
        var y = 50
        transform: bind translate(x, y)
        radius: 30
        fill: red
        onMouseDragged: operation(e) {
                x += e.localDragTranslation.x;
                y += e.localDragTranslation.y;

        }
    }
}

import javafx.ui.*;
import javafx.ui.canvas.*;

Canvas {
    content: Circle {
        var x = 50
        var y = 50
        var radius = 30
        transform: bind translate(x, y)
        radius: bind radius
        fill: red
        onMouseDragged: operation(e) {
            if (e.button == 1){
                x += e.localDragTranslation.x;
                y += e.localDragTranslation.y;
            }
            if (e.button == 3) {
                radius += e.localDragTranslation.x;
            }
        }
    }
}

import javafx.ui.*;
import javafx.ui.canvas.*;

Canvas {
    content: [
    Rect {x: 50, y: 50, width: 50, height: 50, fill: orange },
    Circle {
        var x = 50
        var y = 50
        var radius = 30
        var color = red:Color
        transform: bind translate(x, y)
        radius: bind radius
        fill: bind color
        onMouseDragged: operation(e) {
            if (e.button == 1){
                x += e.localDragTranslation.x;
                y += e.localDragTranslation.y;
            }
            if (e.button == 3) {
                radius += e.localDragTranslation.x;
            }
        }
        onMousePressed: operation(e){
            color = Color {blue: 0.0, green: 0.0, red: 1.0, opacity: 0.5};
        }
        onMouseReleased: operation(e){
            color = red:Color;
        }
    }]
}

You can test this examples with thhe JavaFX Pad or using Netbeans with the JavaFX Plugin.

Published inenglish

2 Comments

  1. […] a lot to do with JavaFX is draggable objects. Due to some recent changes in the JavaFX syntax my old codes for that are no longer working. Joshua Marinacci from Sun’s JavaFX engineering team and other guys […]

Leave a Reply

Your email address will not be published.