我是JavaFx的新手，我正在制作一个简单的绘图程序，在那里我可以绘制形状。我现在遇到的问题是，当我点击屏幕时，我不知道如何使圆圈出现在屏幕上。所以，首先我想按下一个显示“圆形”的按钮，然后当我单击画布时，我希望它产生。（我正在场景生成器和intellij btw之间切换）。

这是我的一些程序:

课程：

public abstract class Shape {

    double x;
    double y;
    double width;
    double height;

    public Color color = Color.WHITE;


    public void creatingShapes(double x, double y, int width, int height) {

        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;

    }

    public void setColor(Color color) {

        this.color = color;
    }

    public double getX() {
        return x;
    }

    public void setX(double x) {
        this.x = x;
    }

    public double getY() {
        return y;
    }

    public void setY(double y) {
        this.y = y;
    }

    public double getWidth() {
        return width;
    }

    public void setWidth(double width) {
        this.width = width;
    }

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public Color getColor() {
        return color;
    }
    public abstract void draw(GraphicsContext g);

}

公共类Circle扩展Shape{

@Override

公共无效绘制（图形上下文 g） {

g.setFill(color);
g.fillOval(200,200,200,200);
g.fillRect(getX(),getY(),getWidth(),getHeight());
g.setStroke(Color.BLACK);
g.strokeOval(getX(),getY(),getWidth(),getHeight());

====================================================

控制器类别:

公共类HelloController{

@FXML
private Button logoutButton;
@FXML
private BorderPane scenePane;

Stage stage;

@FXML
private ColorPicker myColorPicker;
@FXML
private ChoiceBox<String> myChoiceBox;

@FXML
private Button circle;
@FXML
private GraphicsContext g;

private final Shape[] shapes = new Shape[500];

Canvas canvas = new Canvas(310,333);

boolean drawShape = true;
int count = 0;
private final Color currentColor = Color.BLUE;

private final String[] menuAlternatives = {"Sparning", "Testing?", "Exit?"};

public void onCircleClicked() {

    circle.setOnAction((event) -> addShape(new Circle()));



}



//skapa shapes
public void addShape(Shape shape) {

    shape.setColor(currentColor);
    shape.creatingShapes(10,10,150,100);
    shapes[count] = shape;
    count++;
    paintCanvas();
}


public void changeColor(ActionEvent event) {


    Color myColor = myColorPicker.getValue();
    scenePane.setBackground(new Background(new BackgroundFill(myColor, null, null)));



}


public void initialize() {

    g = canvas.getGraphicsContext2D();


}
public void paintCanvas() {

    g.setFill(Color.WHITE);
    g.fillRect(0,0,400,400);
    Arrays.stream(shapes, 0, count).forEach(s -> s.draw(g));


}