How to make canvas Resizable in javaFX?

Question

In javaFX to resize a canvas there is no such method to do that, the only solution is to extends from Canvas.

class ResizableCanvas extends Canvas {

    pub         


        

Answer 1

There's a guide that I think that you may find useful for setting up a resizable canvas:

JavaFx tip - resizable canvas

Piece of code from the guide:

/**
 * Tip 1: A canvas resizing itself to the size of
 *        the parent pane.
 */
public class Tip1ResizableCanvas extends Application {

    class ResizableCanvas extends Canvas {

        public ResizableCanvas() {
            // Redraw canvas when size changes.
            widthProperty().addListener(evt -> draw());
            heightProperty().addListener(evt -> draw());
        }

        private void draw() {
            double width = getWidth();
            double height = getHeight();

            GraphicsContext gc = getGraphicsContext2D();
            gc.clearRect(0, 0, width, height);

            gc.setStroke(Color.RED);
            gc.strokeLine(0, 0, width, height);
            gc.strokeLine(0, height, width, 0);
        }

        @Override
        public boolean isResizable() {
            return true;
        }

        @Override
        public double prefWidth(double height) {
            return getWidth();
        }

        @Override
        public double prefHeight(double width) {
            return getHeight();
        }
    }