fix of The Circle class stores the center point and radius, and it implements...

fix of The Circle class stores the center point and radius, and it implements the draw method to render the circle using JavaFX's GraphicsContext.

src/main/java/shape/Circle.java

@@ -2,24 +2,36 @@ package shape;
 
 import javafx.geometry.Point2D;
 import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.paint.Color;
 
 public class Circle implements Shape {
+    private Point2D center;
+    private double radius;
+    private Color color;
 
-    public Circle(double x, double y, double sqrt) {
+    public Circle(Color color, double x, double y, double radius) {
+        this.color = color;
+        this.center = new Point2D(x, y);
+        this.radius = radius;
     }
 
     @Override
     public int pointsCount() {
-        return 0;
+        return 1;  // Un cercle n'a qu'un centre
     }
 
     @Override
     public Point2D point(int index) {
-        return null;
+        if (index == 0) {
+            return center;
+        }
+        throw new IndexOutOfBoundsException("Circle has only one center point.");
     }
 
     @Override
     public void draw(GraphicsContext context) {
-
+        context.setStroke(color);
+        context.strokeOval(center.getX() - radius, center.getY() - radius,
+                radius * 2, radius * 2);
     }
 }