SVGPath scale proportionally - and automatically

Hello

I am trying to use a SVG path to create a shot of a territory (country) on top of some nodes will be placed, to represent cities.

I tried style area to take the desired shape, but when resizing the stage, it loses its proportions. So, my country gets all distorted. :) Is it possible to force a region maintain its proportions globally?

Also, I tried with the old good SVGPath forms are not resizable by self (disappointment), so I had to use scaleX and scaleY, but still don't know how to make the link between these two dimensions of the parent StackPane.

Any ideas on how to achieve this?

Published by: scekics on 08.06.2012. 12.11

Here is a piece of code that does what you want. I hope it helps.

package jfxfeatures.graphics.shapes.paths.butterfly;

import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.scene.Group;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.scene.layout.StackPane;
import javafx.scene.shape.SVGPath;
import javafx.scene.shape.SVGPathBuilder;
import javafx.scene.transform.Scale;
import javafx.scene.transform.Translate;
import javafx.stage.Stage;

public class ScaleTest extends Application {

     private final static String svg = "M100 50 L150 0 L200 50 L150 100 Z";
     private Pane editPane;
     private Group graphics;
     private Node content;

     @Override
     public void start(final Stage stage) throws Exception {
        stage.setTitle(getClass().getSimpleName());

        editPane = new Pane();
        graphics = new Group();
     editPane.getChildren().add(graphics);

        StackPane root = new StackPane();
        root.getChildren().add(editPane);

        Scene scene = new Scene(root, 800, 800);
        stage.setScene(scene);
        stage.show();

        content = loadContent();
        graphics.getChildren().add(content);

        editPane.widthProperty().addListener(new ChangeListener(){
               @Override
               public void changed(ObservableValue observable, Number oldValue, Number newValue) {
                    adjustTransform();
               }});

        editPane.heightProperty().addListener(new ChangeListener(){
               @Override
               public void changed(ObservableValue observable, Number oldValue, Number newValue) {
                    adjustTransform();
               }});

        Platform.runLater(new Runnable() {
               @Override
               public void run() {
                    adjustTransform();
               }
          });
     }

     private Node loadContent() {
          SVGPath p = SVGPathBuilder.create().content(svg).style("-fx-stroke-width:5;-fx-fill:null;-fx-stroke:black").build();
          Group content = new Group();
          content.getChildren().add(p);
          return content;
     }

     private void adjustTransform() {
          graphics.getTransforms().clear();

          double cx = content.getBoundsInParent().getMinX();
          double cy = content.getBoundsInParent().getMinY();
          double cw = content.getBoundsInParent().getWidth();
          double ch = content.getBoundsInParent().getHeight();

          double ew = editPane.getWidth();
          double eh = editPane.getHeight();

          if (ew > 0.0 && eh > 0.0) {
               double scale = Math.min(ew/cw, eh/ch);

               // Offset to center content
               double sx = 0.5 * (ew - cw*scale);
               double sy = 0.5 * (eh - ch*scale);               

               graphics.getTransforms().add(new Translate(sx, sy));
               graphics.getTransforms().add(new Translate(-cx, -cy));
               graphics.getTransforms().add(new Scale(scale, scale, cx, cy));
          }
     }

     public static void main(String[] args) {
          launch(args);
     }

}

Tags: Java

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