Allow to zoom/scale any JavaFX node with pivot at scene (x,y) coordinates. - Java JavaFX

Java examples for JavaFX:Node

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Description

Allow to zoom/scale any JavaFX node with pivot at scene (x,y) coordinates.

Demo Code


//package com.java2s;
import javafx.geometry.Bounds;
import javafx.scene.Node;
import javafx.scene.input.ScrollEvent;
import javafx.scene.input.ZoomEvent;

public class Main {
    /** Allow to zoom/scale any node with pivot at scene (x,y) coordinates.
     *//  w  w  w  .  ja  va2 s . c  om
     * @param node
     * @param factor
     * @param x
     * @param y
     */
    public static void zoom(Node node, double factor, double x, double y) {
        double oldScale = node.getScaleX();
        double scale = oldScale * factor;
        if (scale < 0.05)
            scale = 0.05;
        if (scale > 50)
            scale = 50;
        node.setScaleX(scale);
        node.setScaleY(scale);

        double f = (scale / oldScale) - 1;
        Bounds bounds = node.localToScene(node.getBoundsInLocal());
        double dx = (x - (bounds.getWidth() / 2 + bounds.getMinX()));
        double dy = (y - (bounds.getHeight() / 2 + bounds.getMinY()));

        node.setTranslateX(node.getTranslateX() - f * dx);
        node.setTranslateY(node.getTranslateY() - f * dy);
    }

    public static void zoom(Node node, ScrollEvent event) {
        zoom(node, Math.pow(1.01, event.getDeltaY()), event.getSceneX(),
                event.getSceneY());
    }

    public static void zoom(Node node, ZoomEvent event) {
        zoom(node, event.getZoomFactor(), event.getSceneX(),
                event.getSceneY());
    }
}

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