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Scenic View is a JavaFX application designed to make it simple to understand the current state of your application scenegraph, and to also easily manipulate properties of the scenegraph without having to keep editing your code. This lets you find bugs, and get things pixel perfect without having to do the compile-check-compile dance.

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/*
 * Scenic View, 
 * Copyright (C) 2014 Jonathan Giles, Ander Ruiz, Amy Fowler, Arnaud Nouard
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.scenicview.view.threedom;

import javafx.beans.property.Property;
import javafx.event.EventHandler;
import javafx.geometry.Orientation;
import javafx.scene.Node;
import javafx.scene.input.KeyCode;
import javafx.scene.input.KeyEvent;
import javafx.scene.input.MouseButton;
import javafx.scene.input.MouseEvent;
import javafx.scene.input.ScrollEvent;
import javafx.scene.input.ZoomEvent;

public class ZoomSupport {

    public EventHandler keyboardEventHandler;
    public EventHandler mouseEventHandler;
    private Number anchorX, anchorY;
    private Number anchor;
    private double dragAnchor;
    private MouseEvent lastMouseEvent;
    private final Node target;

    public ZoomSupport(Node target, final KeyCode modifier, final MouseButton mouseButton, final Orientation orientation, final Property property,final Property propertyX, final double factor) {
        this.target = target;
        mouseEventHandler = (ScrollEvent t) -> {
            if (t.getEventType() == ScrollEvent.SCROLL) {
                double deltaY = t.getDeltaY();
                Number value = property.getValue();
                property.setValue(value.doubleValue()-(deltaY*factor));
                // x
                deltaY = t.getDeltaX();
                value = propertyX.getValue();
                propertyX.setValue(value.doubleValue()-(deltaY*factor));
                t.consume();
            }
        };
        EventHandler zoomEventHandler = (ZoomEvent z) -> {
            if (z.getEventType() == ZoomEvent.ZOOM) {
                double deltaY = z.getTotalZoomFactor();
                deltaY-=1;  // Make zoom out negative
                Number value = property.getValue();
                property.setValue(value.doubleValue()+deltaY*0.7);
                z.consume();
            }
        };
        
        target.addEventHandler(ScrollEvent.ANY, mouseEventHandler);
        target.addEventHandler(ZoomEvent.ANY, zoomEventHandler);
    }
}