App.java

package shape;

import javafx.application.Application;
import javafx.geometry.Point2D;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.canvas.Canvas;
import javafx.scene.canvas.GraphicsContext;
import javafx.scene.paint.Color;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

import java.util.Arrays;


public class App extends Application {

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

    @Override
    public void start(Stage primaryStage) {
        Group root = new Group();
        Canvas canvas = new Canvas(400, 400);
        GraphicsContext graphicsContext = canvas.getGraphicsContext2D();
        ShapeContainer shapeContainer = new ShapeContainer();

        graphicsContext.setFill(Color.AQUAMARINE);
        graphicsContext.fillRect(0, 0, canvas.getWidth(), canvas.getHeight());

        Polygon triangle = new Polygon(Color.RED, Arrays.asList(
                new Point2D(100, 50),
                new Point2D(150, 150),
                new Point2D(50, 150)
        ));


        graphicsContext.fillOval(10,10,10,10);
        shapeContainer.addShape(new Rectangle(Color.BLUE,new Point2D(10,10), new Point2D(40,40)));
        shapeContainer.draw(graphicsContext);
        root.getChildren().add(canvas);
        primaryStage.setScene(new Scene(root));
        primaryStage.show();
    }
}