Javafx中带有画布的DrawCircle (GraphicsContext gc)

Question

我不得不在JavaFX中用画布绘制规则多边形，我也怀疑如何用GraphicsContext设计一个带画布的圆圈。

我有一个包含两个轴(x，y)的点类

public class Point2D {

         private float mX;
         private float mY;

         public Point2D () {
            this (0,0);
         }

         public Point2D (float x, float y) {
             mX = x;
             mY = y;
         }

        public float getX() {
           return mX;
          }

       public float getY() {
          return mY;
  }
}

我有这个循环类，我对公共无效drawCircle(GraphicsContext gc)方法表示怀疑。

public class Circle{

    private Point2D mCenter;
    private Color color;
    private float mRadius;

public Circle (Point2D center, Color color, float radius ) {
         this.mCenter = center;
         this.color = color;
         this.mRadius = radius;
     }

public void drawCircle(GraphicsContext gc) { // My Doubt is here
        Canvas canvas = new Canvas();
        gc = canvas .getGraphicsContext2D();
        gc.setFill(Color.WHITE);
        gc.setStroke(Color.BLACK);

    } 
}

在主JavaFX中

public class PaintGeometricoFX extends Application {

private BorderPane root;

 @Override
    public void start(Stage primaryStage) {

         Point2D p = new Point2D(0, 0);
         Float radius = 4.0f;

         Circle circle = new Circle(p.getX(), p.getY(),Color.BLACK,radius)

         Canvas canvas = new Canvas();
         GraphicsContext gc = imagem.getGraphicsContext2D();

         circle.drawCircle(gc);

          root.setCenter(canvas);


        Scene scene = new Scene(root, 1152, 800);

        primaryStage.setTitle("PAINT");
        primaryStage.setResizable(false);
        primaryStage.setScene(scene);
        primaryStage.show();

    }

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

Answer 1

抚摸：

getGraphicsContext2D().strokeOval(center.x-radius, center.y-radius, radius, radius);

填充：

getGraphicsContext2D().fillOval(center.x-radius, center.y-radius, radius, radius);

Answer 2

抚摸：

getGraphicsContext2D().strokeOval(center.x-radius，中心.y-半径，半径* 2，半径* 2)；

填充：

getGraphicsContext2D().fillOval(center.x-radius，中心.y-半径，半径* 2，半径* 2)；

注意，第3和第4参数是直径，而不是半径。我在ScalaFx和正确的ScalaJs输出之间存在差异。但是我检查了JavaFx文档，它的工作原理是一样的：

fillOval

public void fillOval(double x,
                     double y,
                     double w,
                     double h)

Fills an oval using the current fill paint.

This method will be affected by any of the global common or fill attributes as specified in the Rendering Attributes Table.

Parameters:
    x - the X coordinate of the upper left bound of the oval.
    y - the Y coordinate of the upper left bound of the oval.
    w - the width at the center of the oval.
    h - the height at the center of the oval.