.idea/misc.xml

+<?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" project-jdk-name="corretto-16" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>
\ No newline at end of file

build.gradle

@@ -16,6 +16,7 @@ repositories {
     mavenCentral()
 }
 dependencies {
+    implementation 'org.junit.jupiter:junit-jupiter:5.8.1'
     testImplementation group: 'junit', name: 'junit', version: '4.12'
     testImplementation 'org.hamcrest:hamcrest-library:1.3'
 }

src/main/java/shape/AbstractShape.java

+package shape;
+
+import javafx.geometry.Point2D;
+import javafx.scene.canvas.GraphicsContext;
+
+import java.util.ArrayList;
+import java.util.List;
+
+abstract public class AbstractShape implements Shape {
+
+    private List<Point2D> points = new ArrayList<>();
+
+    public void addPoints(List<Point2D> lpoints){
+        for (Point2D point : lpoints) {
+            points.add(point);
+        }
+    }
+    public int pointsCount() {
+        return points.size();
+    }
+
+    public Point2D point(int index) {
+        return points.get(index);
+    }
+
+    public abstract void draw(GraphicsContext graphicsContext);
+
+}

src/main/java/shape/App.java

 package shape;
 
 import javafx.application.Application;
+import javafx.beans.binding.BooleanExpression;
 import javafx.geometry.Point2D;
 import javafx.scene.Group;
 import javafx.scene.Scene;
@@ -26,6 +27,8 @@ public class App extends Application {
         ShapeContainer shapeContainer = new ShapeContainer();
         graphicsContext.setFill(Color.AQUAMARINE);
         graphicsContext.fillOval(10,10,10,10);
+        Rectangle rect  = new Rectangle(Color.BLUE,new Point2D(10,10), new Point2D(40,40));
+        System.out.println(rect.pointsCount());
         shapeContainer.addShape(new Rectangle(Color.BLUE,new Point2D(10,10), new Point2D(40,40)));
         shapeContainer.draw(graphicsContext);
         root.getChildren().add(canvas);

src/main/java/shape/BorderDecorator.java

+package shape;
+
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.paint.Color;
+
+public class BorderDecorator extends Decorator {
+
+    private double radius;
+
+    BorderDecorator(Shape decoratedShape, double radius){
+        super(decoratedShape);
+        this.radius = radius;
+    }
+
+    @Override
+    void drawDecoration(GraphicsContext graphicsContext) {
+        graphicsContext.setFill(Color.BLUE);
+        for(int i = 0; i< decoratedShape.pointsCount(); i++){
+            graphicsContext.fillOval(decoratedShape.point(i).getX(),decoratedShape.point(i).getY(),5,5);
+        }
+    }
+}

src/main/java/shape/CenterDecorator.java

+package shape;
+
+import javafx.scene.canvas.GraphicsContext;
+
+public class CenterDecorator extends Decorator{
+
+    private double radius;
+
+    CenterDecorator(Shape decoratedShape, double radius){
+        super(decoratedShape);
+        this.radius = radius;
+    }
+
+    @Override
+    void drawDecoration(GraphicsContext graphicsContext) {
+
+    }
+}

src/main/java/shape/Circle.java → src/main/java/shape/Decorator.java

@@ -3,23 +3,23 @@ package shape;
 import javafx.geometry.Point2D;
 import javafx.scene.canvas.GraphicsContext;
 
-public class Circle implements Shape {
+abstract public class Decorator implements Shape{
+    protected Shape decoratedShape;
 
-    public Circle(double x, double y, double sqrt) {
+    Decorator(Shape decoratedShape){
+        this.decoratedShape = decoratedShape;
     }
-
-    @Override
     public int pointsCount() {
-        return 0;
+        return decoratedShape.pointsCount();
     }
 
-    @Override
     public Point2D point(int index) {
-        return null;
+        return decoratedShape.point(index);
     }
 
-    @Override
     public void draw(GraphicsContext context) {
-
+        decoratedShape.draw(context);
     }
+
+    abstract void drawDecoration(GraphicsContext graphicsContext);
 }

src/main/java/shape/Polygon.java

+package shape;
+
+import javafx.geometry.Point2D;
+import javafx.scene.canvas.GraphicsContext;
+import javafx.scene.paint.Color;
+
+import java.util.List;
+
+public class Polygon extends AbstractShape{
+
+    Color color;
+    Polygon(Color color, List<Point2D> points){
+        this.color = color;
+        addPoints(points);
+    }
+
+    @Override
+    public void draw(GraphicsContext context) {
+        context.setFill(color);
+        double[] xPoints = new double[pointsCount()];
+        double[] yPoints = new double[pointsCount()];
+        for (int i = 0; i < pointsCount(); i++){
+            xPoints[i] = point(i).getX();
+            yPoints[i] = point(i).getY();
+        }
+        context.fillPolygon(xPoints, yPoints, pointsCount());
+    }
+}

src/main/java/shape/Rectangle.java

@@ -4,24 +4,22 @@ import javafx.geometry.Point2D;
 import javafx.scene.canvas.GraphicsContext;
 import javafx.scene.paint.Color;
 
-public class Rectangle implements Shape{
+import java.util.ArrayList;
+import java.util.List;
+
+public class Rectangle extends AbstractShape{
     Color color;
     Rectangle(Color color, Point2D point0, Point2D point1){
         this.color = color;
-    }
-
-    @Override
-    public int pointsCount() {
-        return 0;
-    }
-
-    @Override
-    public Point2D point(int index) {
-        return null;
+        List<Point2D> points = new ArrayList<>();
+        points.add(point0);
+        points.add(point1);
+        addPoints(points);
     }
 
     @Override
     public void draw(GraphicsContext context) {
-
+        context.setFill(color);
+        context.fillRect(point(0).getX(), point(0).getY(), point(1).getX() - point(0).getX(), point(1).getY() - point(0).getY());
     }
 }

src/main/java/shape/ShapeContainer.java

@@ -9,7 +9,9 @@ public class ShapeContainer{
 
     private List<Shape> shapes = new ArrayList<>();
 
-    public void addShape(Shape shape){}
+    public void addShape(Shape shape){
+        shapes.add(shape);
+    }
 
     public void  draw(GraphicsContext context){
         for(Shape shape : shapes)

src/main/java/state/Drawer.java

 package state;
 
 import javafx.scene.canvas.Canvas;
-import shape.Circle;
 import shape.Shape;
 
 import java.util.ArrayList;