Is it possible to put ImageView on Canvas in JavaFX?

问题

I am a newbie to javafx. I am developing an application in which I have a canvas and I have drawn several images in it. I want to add an ImageView on my canvas and implement a popup while clicking on the ImageView?

Is there any possibilities with or without ImageView (buttons or any controls?) or is it restricted to use controls over canvas?

I need some suggestions please.

回答1:

You can stack an ImageView on top of a Canvas. Use a StackPane. You can later add mouse listeners to the ImageView.

Is there any possibilities with or without ImageView (buttons or any controls?) or is it restricted to use controls over canvas?

All controls including Button, ImageView and Canvas itself extend from Node and can be used to add in the StackPane.

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;

public class Main extends Application {

    int count = 1;

    @Override
    public void start(Stage stage) {

        StackPane root = new StackPane();
        Scene s = new Scene(root, 400, 400, Color.BLACK);

        final Canvas canvas = new Canvas(300, 300);
        GraphicsContext gc = canvas.getGraphicsContext2D();

        gc.setFill(Color.BLUE);
        gc.fillRect(10, 10, 300, 300);

        ImageView image = new ImageView("https://cdn0.iconfinder.com/data/icons/toys/256/teddy_bear_toy_6.png");

        // Listener for MouseClick
        image.setOnMouseClicked(e -> {
            Stage popup = new Stage();
            popup.initOwner(stage);
            popup.show();
        });

        root.getChildren().addAll(canvas, image);

        stage.setScene(s);
        stage.show();
    }

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

Output:

Scene has Black Background
Canvas has Blue Background
ImageView is the bear.

回答2:

If you just want add button, image ... on the top of your canvas you should use StackPane. You first add your canvas and then you can add Button or whatever you want.

 StackPane stack = new StackPane();
 stack.getChildren().addAll(yourCanvas, yourButton);

You should read this for a better understanding of Layouting with JavaFX.

来源：https://stackoverflow.com/questions/30068651/is-it-possible-to-put-imageview-on-canvas-in-javafx

标签

java

canvas

javafx

popup

imageview